Hi all, I have monthly raster for different parameters in three different folders. I am trying to take the minimum value of raster from each raster in two different parameters and solve the below equation. For that, I have written a code, but the code is producing an error. It is giving an error in line no 35. Sample data attached below Code: def main ( ) : import arcpy import os arcpy . env . overwriteOutput = True # Checkout extension arcpy . CheckOutExtension ( "Spatial" ) ws_in_APAR = r 'E:\APAR' ws_in_TSCALAR = r 'E:\T_SCALAR' ws_in_WSCALAR = r 'E:\W_SCALAR' ws_out_GPP = r 'E:\GPP_1982' # list "mean" rasters (r001_APAR so on) arcpy . env . workspace = ws_in_APAR lst_ras_APAR = arcpy . ListRasters ( ) print "lst_ras_APAR" , lst_ras_APAR # list "mean" rasters (r001_TSCALAR so on) arcpy . env . workspace = ws_in_TSCALAR lst_ras_TSCALAR = arcpy . ListRasters ( ) print "lst_ras_TSCALAR" , lst_ras_TSCALAR # list "mean" rasters (r001_WSCALAR so on) arcpy . env . workspace = ws_in_WSCALAR lst_ras_WSCALAR = arcpy . ListRasters ( ) print "lst_ras_WSCALAR" , lst_ras_WSCALAR for ras_name in lst_ras_APAR , lst_ras_TSCALAR , lst_ras_WSCALAR : ras_APAR = arcpy . Raster ( os . path . join ( ws_in_APAR , ras_APAR ) ) ras_TSCALAR = arcpy . Raster ( os . path . join ( ws_in_TSCALAR , ras_TSCALAR ) ) ras_WSCALAR = arcpy . Raster ( os . path . join ( ws_in_WSCALAR , ras_WSCALAR ) ) # calculate (ras_TSCALAR.minimum wil take the minimum value of perticular raster) ras_GPP = ( ras_APAR * 1.48 ) * ( ras_TSCALAR . minimum * ras_WSCALAR . minimum ) # save raster ras_num = ras_name [ : 3 ] out_name_GPP = os . path . join ( ws_out_GPP , 'r{0}_GPP' . format ( ras_num ) ) ras_GPP . save ( out_name_GPP ) if __name__ == '__main__' : main ( ) Error message: Traceback ( most recent call last ) : File "E:\GPP.py" , line 64 , in module > main ( ) File "E:\GPP.py" , line 47 , in main ras_APAR = arcpy . Raster ( os . path . join ( ws_in_APAR , ras_APAR ) ) UnboundLocalError : local variable 'ras_APAR' referenced before assignment Test_Data.rar

Have a try with this code (change the paths on lines 8 to 11): def main ( ) : import arcpy import os arcpy . env . overwriteOutput = True # Checkout extension arcpy . CheckOutExtension ( "Spatial" ) ws_in_APAR = r 'C:\GeoNet\MinMultiRas\APAR' ws_in_TSCALAR = r 'C:\GeoNet\MinMultiRas\T_SCALAR' ws_in_WSCALAR = r 'C:\GeoNet\MinMultiRas\W_SCALAR' ws_out_GPP = r 'C:\GeoNet\MinMultiRas\GPP_1982' # list "mean" rasters (r001_APAR so on) arcpy . env . workspace = ws_in_APAR lst_ras_APAR = arcpy . ListRasters ( ) print "lst_ras_APAR" , lst_ras_APAR # list "mean" rasters (r001_TSCALAR so on) arcpy . env . workspace = ws_in_TSCALAR lst_ras_TSCALAR = arcpy . ListRasters ( ) print "lst_ras_TSCALAR" , lst_ras_TSCALAR # list "mean" rasters (r001_WSCALAR so on) arcpy . env . workspace = ws_in_WSCALAR lst_ras_WSCALAR = arcpy . ListRasters ( ) print "lst_ras_WSCALAR" , lst_ras_WSCALAR if len ( lst_ras_APAR ) == len ( lst_ras_TSCALAR ) == len ( lst_ras_WSCALAR ) : print ( "each list has equal amount of rasters, let's assume they match..." ) for i in range ( len ( lst_ras_APAR ) ) : ras_APAR = arcpy . Raster ( os . path . join ( ws_in_APAR , lst_ras_APAR [ i ] ) ) ras_TSCALAR = arcpy . Raster ( os . path . join ( ws_in_TSCALAR , lst_ras_TSCALAR [ i ] ) ) ras_WSCALAR = arcpy . Raster ( os . path . join ( ws_in_WSCALAR , lst_ras_WSCALAR [ i ] ) ) for ras_path in [ os . path . join ( ws_in_APAR , lst_ras_APAR [ i ] ) , os . path . join ( ws_in_TSCALAR , lst_ras_TSCALAR [ i ] ) , os . path . join ( ws_in_WSCALAR , lst_ras_WSCALAR [ i ] ) ] : arcpy . CalculateStatistics_management ( ras_path ) # calculate (ras_TSCALAR.minimum wil take the minimum value of perticular raster) print ( "ras_TSCALAR.minimum: {}" . format ( ras_TSCALAR . minimum ) ) print ( "ras_WSCALAR.minimum: {}" . format ( ras_WSCALAR . minimum ) ) ras_GPP = ( ras_APAR * 1.48 ) * ( ras_TSCALAR . minimum * ras_WSCALAR . minimum ) # save raster ras_name = lst_ras_APAR [ i ] ras_num = ras_name [ 1 : 4 ] out_name_GPP = os . path . join ( ws_out_GPP , 'r{0}_GPP' . format ( ras_num ) ) print out_name_GPP ras_GPP . save ( out_name_GPP ) else : print ( "raster list have unequal number of items, aborting process..." ) arcpy . CheckInExtension ( "Spatial" ) if __name__ == '__main__' : main ( ) What I changed was the way the rasters are extracted from the lists and I included a calculate statistics since for some reason they are not present and that caused the minimum value to be None.

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Take Minimum value of multiple raster using ArcPy

ShouvikJha

Hi all,

I have monthly raster for different parameters in three different folders. I am trying to take the minimum value of raster from each raster in two different parameters and solve the below equation. For that, I have written a code, but the code is producing an error.

It is giving an error in line no 35.

Sample data attached below

Code:

<SPAN class="keyword token">def</SPAN> <SPAN class="token function">main</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">import</SPAN> arcpy
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">import</SPAN> os
&nbsp;&nbsp;&nbsp; arcpy<SPAN class="punctuation token">.</SPAN>env<SPAN class="punctuation token">.</SPAN>overwriteOutput <SPAN class="operator token">=</SPAN> <SPAN class="token boolean">True</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="comment token"># Checkout extension</SPAN>
&nbsp;&nbsp;&nbsp; arcpy<SPAN class="punctuation token">.</SPAN>CheckOutExtension<SPAN class="punctuation token">(</SPAN><SPAN class="string token">"Spatial"</SPAN><SPAN class="punctuation token">)</SPAN>

&nbsp;&nbsp;&nbsp; ws_in_APAR <SPAN class="operator token">=</SPAN> r<SPAN class="string token">'E:\APAR'</SPAN>

&nbsp;&nbsp;&nbsp; ws_in_TSCALAR <SPAN class="operator token">=</SPAN> r<SPAN class="string token">'E:\T_SCALAR'</SPAN>

&nbsp;&nbsp;&nbsp; ws_in_WSCALAR <SPAN class="operator token">=</SPAN> r<SPAN class="string token">'E:\W_SCALAR'</SPAN>

&nbsp;&nbsp;&nbsp; ws_out_GPP <SPAN class="operator token">=</SPAN> r<SPAN class="string token">'E:\GPP_1982'</SPAN>


&nbsp;&nbsp;&nbsp; <SPAN class="comment token"># list "mean" rasters (r001_APAR so on)</SPAN>
&nbsp;&nbsp;&nbsp; arcpy<SPAN class="punctuation token">.</SPAN>env<SPAN class="punctuation token">.</SPAN>workspace <SPAN class="operator token">=</SPAN> ws_in_APAR
&nbsp;&nbsp;&nbsp; lst_ras_APAR <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>ListRasters<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">print</SPAN> <SPAN class="string token">"lst_ras_APAR"</SPAN><SPAN class="punctuation token">,</SPAN> lst_ras_APAR

&nbsp;&nbsp;&nbsp; <SPAN class="comment token"># list "mean" rasters (r001_TSCALAR so on)</SPAN>
&nbsp;&nbsp;&nbsp; arcpy<SPAN class="punctuation token">.</SPAN>env<SPAN class="punctuation token">.</SPAN>workspace <SPAN class="operator token">=</SPAN> ws_in_TSCALAR
&nbsp;&nbsp;&nbsp; lst_ras_TSCALAR <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>ListRasters<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">print</SPAN> <SPAN class="string token">"lst_ras_TSCALAR"</SPAN><SPAN class="punctuation token">,</SPAN> lst_ras_TSCALAR

&nbsp;&nbsp;&nbsp; <SPAN class="comment token"># list "mean" rasters (r001_WSCALAR so on)</SPAN>
&nbsp;&nbsp;&nbsp; arcpy<SPAN class="punctuation token">.</SPAN>env<SPAN class="punctuation token">.</SPAN>workspace <SPAN class="operator token">=</SPAN> ws_in_WSCALAR
&nbsp;&nbsp;&nbsp; lst_ras_WSCALAR <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>ListRasters<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">print</SPAN> <SPAN class="string token">"lst_ras_WSCALAR"</SPAN><SPAN class="punctuation token">,</SPAN> lst_ras_WSCALAR




&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">for</SPAN> ras_name <SPAN class="keyword token">in</SPAN> lst_ras_APAR<SPAN class="punctuation token">,</SPAN> lst_ras_TSCALAR<SPAN class="punctuation token">,</SPAN> lst_ras_WSCALAR&nbsp;&nbsp; <SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ras_APAR <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>Raster<SPAN class="punctuation token">(</SPAN>os<SPAN class="punctuation token">.</SPAN>path<SPAN class="punctuation token">.</SPAN>join<SPAN class="punctuation token">(</SPAN>ws_in_APAR<SPAN class="punctuation token">,</SPAN> ras_APAR<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ras_TSCALAR <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>Raster<SPAN class="punctuation token">(</SPAN>os<SPAN class="punctuation token">.</SPAN>path<SPAN class="punctuation token">.</SPAN>join<SPAN class="punctuation token">(</SPAN>ws_in_TSCALAR<SPAN class="punctuation token">,</SPAN> ras_TSCALAR<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ras_WSCALAR <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>Raster<SPAN class="punctuation token">(</SPAN>os<SPAN class="punctuation token">.</SPAN>path<SPAN class="punctuation token">.</SPAN>join<SPAN class="punctuation token">(</SPAN>ws_in_WSCALAR<SPAN class="punctuation token">,</SPAN> ras_WSCALAR<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN>



&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="comment token"># calculate (ras_TSCALAR.minimum wil take the minimum value of perticular raster)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ras_GPP <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">(</SPAN>ras_APAR <SPAN class="operator token">*</SPAN> <SPAN class="number token">1.48</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="operator token">*</SPAN> <SPAN class="punctuation token">(</SPAN>ras_TSCALAR<SPAN class="punctuation token">.</SPAN>minimum <SPAN class="operator token">*</SPAN> ras_WSCALAR<SPAN class="punctuation token">.</SPAN>minimum<SPAN class="punctuation token">)</SPAN>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="comment token"># save raster</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ras_num <SPAN class="operator token">=</SPAN> ras_name<SPAN class="punctuation token">[</SPAN><SPAN class="punctuation token">:</SPAN><SPAN class="number token">3</SPAN><SPAN class="punctuation token">]</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; out_name_GPP <SPAN class="operator token">=</SPAN> os<SPAN class="punctuation token">.</SPAN>path<SPAN class="punctuation token">.</SPAN>join<SPAN class="punctuation token">(</SPAN>ws_out_GPP<SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'r{0}_GPP'</SPAN><SPAN class="punctuation token">.</SPAN>format<SPAN class="punctuation token">(</SPAN>ras_num<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ras_GPP<SPAN class="punctuation token">.</SPAN>save<SPAN class="punctuation token">(</SPAN>out_name_GPP<SPAN class="punctuation token">)</SPAN>



<SPAN class="keyword token">if</SPAN> __name__ <SPAN class="operator token">==</SPAN> <SPAN class="string token">'__main__'</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp; main<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

Error message:

Traceback <SPAN class="punctuation token">(</SPAN>most recent call last<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp; File <SPAN class="string token">"E:\GPP.py"</SPAN><SPAN class="punctuation token">,</SPAN> line <SPAN class="number token">64</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="keyword token">in</SPAN> <SPAN class="operator token"><</SPAN>module<SPAN class="operator token">></SPAN>
&nbsp;&nbsp;&nbsp; main<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp; File <SPAN class="string token">"E:\GPP.py"</SPAN><SPAN class="punctuation token">,</SPAN> line <SPAN class="number token">47</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="keyword token">in</SPAN> main
&nbsp;&nbsp;&nbsp; ras_APAR <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>Raster<SPAN class="punctuation token">(</SPAN>os<SPAN class="punctuation token">.</SPAN>path<SPAN class="punctuation token">.</SPAN>join<SPAN class="punctuation token">(</SPAN>ws_in_APAR<SPAN class="punctuation token">,</SPAN> ras_APAR<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN>
UnboundLocalError<SPAN class="punctuation token">:</SPAN> local variable <SPAN class="string token">'ras_APAR'</SPAN> referenced before assignment‍‍‍‍‍‍‍‍‍‍‍‍<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

Test_Data.rar

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Accepted answers

XanderBakker

Have a try with this code (change the paths on lines 8 to 11):

<SPAN class="keyword token">def</SPAN> <SPAN class="token function">main</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">import</SPAN> arcpy
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">import</SPAN> os
&nbsp;&nbsp;&nbsp; arcpy<SPAN class="punctuation token">.</SPAN>env<SPAN class="punctuation token">.</SPAN>overwriteOutput <SPAN class="operator token">=</SPAN> <SPAN class="token boolean">True</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="comment token"># Checkout extension</SPAN>
&nbsp;&nbsp;&nbsp; arcpy<SPAN class="punctuation token">.</SPAN>CheckOutExtension<SPAN class="punctuation token">(</SPAN><SPAN class="string token">"Spatial"</SPAN><SPAN class="punctuation token">)</SPAN>

&nbsp;&nbsp;&nbsp; ws_in_APAR <SPAN class="operator token">=</SPAN> r<SPAN class="string token">'C:\GeoNet\MinMultiRas\APAR'</SPAN>
&nbsp;&nbsp;&nbsp; ws_in_TSCALAR <SPAN class="operator token">=</SPAN> r<SPAN class="string token">'C:\GeoNet\MinMultiRas\T_SCALAR'</SPAN>
&nbsp;&nbsp;&nbsp; ws_in_WSCALAR <SPAN class="operator token">=</SPAN> r<SPAN class="string token">'C:\GeoNet\MinMultiRas\W_SCALAR'</SPAN>
&nbsp;&nbsp;&nbsp; ws_out_GPP <SPAN class="operator token">=</SPAN> r<SPAN class="string token">'C:\GeoNet\MinMultiRas\GPP_1982'</SPAN>

&nbsp;&nbsp;&nbsp; <SPAN class="comment token"># list "mean" rasters (r001_APAR so on)</SPAN>
&nbsp;&nbsp;&nbsp; arcpy<SPAN class="punctuation token">.</SPAN>env<SPAN class="punctuation token">.</SPAN>workspace <SPAN class="operator token">=</SPAN> ws_in_APAR
&nbsp;&nbsp;&nbsp; lst_ras_APAR <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>ListRasters<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">print</SPAN> <SPAN class="string token">"lst_ras_APAR"</SPAN><SPAN class="punctuation token">,</SPAN> lst_ras_APAR

&nbsp;&nbsp;&nbsp; <SPAN class="comment token"># list "mean" rasters (r001_TSCALAR so on)</SPAN>
&nbsp;&nbsp;&nbsp; arcpy<SPAN class="punctuation token">.</SPAN>env<SPAN class="punctuation token">.</SPAN>workspace <SPAN class="operator token">=</SPAN> ws_in_TSCALAR
&nbsp;&nbsp;&nbsp; lst_ras_TSCALAR <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>ListRasters<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">print</SPAN> <SPAN class="string token">"lst_ras_TSCALAR"</SPAN><SPAN class="punctuation token">,</SPAN> lst_ras_TSCALAR

&nbsp;&nbsp;&nbsp; <SPAN class="comment token"># list "mean" rasters (r001_WSCALAR so on)</SPAN>
&nbsp;&nbsp;&nbsp; arcpy<SPAN class="punctuation token">.</SPAN>env<SPAN class="punctuation token">.</SPAN>workspace <SPAN class="operator token">=</SPAN> ws_in_WSCALAR
&nbsp;&nbsp;&nbsp; lst_ras_WSCALAR <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>ListRasters<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">print</SPAN> <SPAN class="string token">"lst_ras_WSCALAR"</SPAN><SPAN class="punctuation token">,</SPAN> lst_ras_WSCALAR

&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> len<SPAN class="punctuation token">(</SPAN>lst_ras_APAR<SPAN class="punctuation token">)</SPAN> <SPAN class="operator token">==</SPAN> len<SPAN class="punctuation token">(</SPAN>lst_ras_TSCALAR<SPAN class="punctuation token">)</SPAN> <SPAN class="operator token">==</SPAN> len<SPAN class="punctuation token">(</SPAN>lst_ras_WSCALAR<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">print</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">"each list has equal amount of rasters, let's assume they match..."</SPAN><SPAN class="punctuation token">)</SPAN>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">for</SPAN> i <SPAN class="keyword token">in</SPAN> range<SPAN class="punctuation token">(</SPAN>len<SPAN class="punctuation token">(</SPAN>lst_ras_APAR<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ras_APAR <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>Raster<SPAN class="punctuation token">(</SPAN>os<SPAN class="punctuation token">.</SPAN>path<SPAN class="punctuation token">.</SPAN>join<SPAN class="punctuation token">(</SPAN>ws_in_APAR<SPAN class="punctuation token">,</SPAN> lst_ras_APAR<SPAN class="punctuation token">[</SPAN>i<SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ras_TSCALAR <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>Raster<SPAN class="punctuation token">(</SPAN>os<SPAN class="punctuation token">.</SPAN>path<SPAN class="punctuation token">.</SPAN>join<SPAN class="punctuation token">(</SPAN>ws_in_TSCALAR<SPAN class="punctuation token">,</SPAN> lst_ras_TSCALAR<SPAN class="punctuation token">[</SPAN>i<SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ras_WSCALAR <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>Raster<SPAN class="punctuation token">(</SPAN>os<SPAN class="punctuation token">.</SPAN>path<SPAN class="punctuation token">.</SPAN>join<SPAN class="punctuation token">(</SPAN>ws_in_WSCALAR<SPAN class="punctuation token">,</SPAN> lst_ras_WSCALAR<SPAN class="punctuation token">[</SPAN>i<SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">for</SPAN> ras_path <SPAN class="keyword token">in</SPAN> <SPAN class="punctuation token">[</SPAN>os<SPAN class="punctuation token">.</SPAN>path<SPAN class="punctuation token">.</SPAN>join<SPAN class="punctuation token">(</SPAN>ws_in_APAR<SPAN class="punctuation token">,</SPAN> lst_ras_APAR<SPAN class="punctuation token">[</SPAN>i<SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; os<SPAN class="punctuation token">.</SPAN>path<SPAN class="punctuation token">.</SPAN>join<SPAN class="punctuation token">(</SPAN>ws_in_TSCALAR<SPAN class="punctuation token">,</SPAN> lst_ras_TSCALAR<SPAN class="punctuation token">[</SPAN>i<SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; os<SPAN class="punctuation token">.</SPAN>path<SPAN class="punctuation token">.</SPAN>join<SPAN class="punctuation token">(</SPAN>ws_in_WSCALAR<SPAN class="punctuation token">,</SPAN> lst_ras_WSCALAR<SPAN class="punctuation token">[</SPAN>i<SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; arcpy<SPAN class="punctuation token">.</SPAN>CalculateStatistics_management<SPAN class="punctuation token">(</SPAN>ras_path<SPAN class="punctuation token">)</SPAN>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="comment token"># calculate (ras_TSCALAR.minimum wil take the minimum value of perticular raster)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">print</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">"ras_TSCALAR.minimum: {}"</SPAN><SPAN class="punctuation token">.</SPAN>format<SPAN class="punctuation token">(</SPAN>ras_TSCALAR<SPAN class="punctuation token">.</SPAN>minimum<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">print</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">"ras_WSCALAR.minimum: {}"</SPAN><SPAN class="punctuation token">.</SPAN>format<SPAN class="punctuation token">(</SPAN>ras_WSCALAR<SPAN class="punctuation token">.</SPAN>minimum<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ras_GPP <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">(</SPAN>ras_APAR <SPAN class="operator token">*</SPAN> <SPAN class="number token">1.48</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="operator token">*</SPAN> <SPAN class="punctuation token">(</SPAN>ras_TSCALAR<SPAN class="punctuation token">.</SPAN>minimum <SPAN class="operator token">*</SPAN> ras_WSCALAR<SPAN class="punctuation token">.</SPAN>minimum<SPAN class="punctuation token">)</SPAN>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="comment token"># save raster</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ras_name <SPAN class="operator token">=</SPAN> lst_ras_APAR<SPAN class="punctuation token">[</SPAN>i<SPAN class="punctuation token">]</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ras_num <SPAN class="operator token">=</SPAN> ras_name<SPAN class="punctuation token">[</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">:</SPAN><SPAN class="number token">4</SPAN><SPAN class="punctuation token">]</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; out_name_GPP <SPAN class="operator token">=</SPAN> os<SPAN class="punctuation token">.</SPAN>path<SPAN class="punctuation token">.</SPAN>join<SPAN class="punctuation token">(</SPAN>ws_out_GPP<SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'r{0}_GPP'</SPAN><SPAN class="punctuation token">.</SPAN>format<SPAN class="punctuation token">(</SPAN>ras_num<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">print</SPAN> out_name_GPP
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ras_GPP<SPAN class="punctuation token">.</SPAN>save<SPAN class="punctuation token">(</SPAN>out_name_GPP<SPAN class="punctuation token">)</SPAN>

&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">else</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">print</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">"raster list have unequal number of items, aborting process..."</SPAN><SPAN class="punctuation token">)</SPAN>

&nbsp;&nbsp;&nbsp; arcpy<SPAN class="punctuation token">.</SPAN>CheckInExtension<SPAN class="punctuation token">(</SPAN><SPAN class="string token">"Spatial"</SPAN><SPAN class="punctuation token">)</SPAN>


<SPAN class="keyword token">if</SPAN> __name__ <SPAN class="operator token">==</SPAN> <SPAN class="string token">'__main__'</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp; main<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

What I changed was the way the rasters are extracted from the lists and I included a calculate statistics since for some reason they are not present and that caused the minimum value to be None.

All comments

ShouvikJha

Xander Bakker‌, Thanks. It's working fine

XanderBakker

Have a try with this code (change the paths on lines 8 to 11):

<SPAN class="keyword token">def</SPAN> <SPAN class="token function">main</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">import</SPAN> arcpy
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">import</SPAN> os
&nbsp;&nbsp;&nbsp; arcpy<SPAN class="punctuation token">.</SPAN>env<SPAN class="punctuation token">.</SPAN>overwriteOutput <SPAN class="operator token">=</SPAN> <SPAN class="token boolean">True</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="comment token"># Checkout extension</SPAN>
&nbsp;&nbsp;&nbsp; arcpy<SPAN class="punctuation token">.</SPAN>CheckOutExtension<SPAN class="punctuation token">(</SPAN><SPAN class="string token">"Spatial"</SPAN><SPAN class="punctuation token">)</SPAN>

&nbsp;&nbsp;&nbsp; ws_in_APAR <SPAN class="operator token">=</SPAN> r<SPAN class="string token">'C:\GeoNet\MinMultiRas\APAR'</SPAN>
&nbsp;&nbsp;&nbsp; ws_in_TSCALAR <SPAN class="operator token">=</SPAN> r<SPAN class="string token">'C:\GeoNet\MinMultiRas\T_SCALAR'</SPAN>
&nbsp;&nbsp;&nbsp; ws_in_WSCALAR <SPAN class="operator token">=</SPAN> r<SPAN class="string token">'C:\GeoNet\MinMultiRas\W_SCALAR'</SPAN>
&nbsp;&nbsp;&nbsp; ws_out_GPP <SPAN class="operator token">=</SPAN> r<SPAN class="string token">'C:\GeoNet\MinMultiRas\GPP_1982'</SPAN>

&nbsp;&nbsp;&nbsp; <SPAN class="comment token"># list "mean" rasters (r001_APAR so on)</SPAN>
&nbsp;&nbsp;&nbsp; arcpy<SPAN class="punctuation token">.</SPAN>env<SPAN class="punctuation token">.</SPAN>workspace <SPAN class="operator token">=</SPAN> ws_in_APAR
&nbsp;&nbsp;&nbsp; lst_ras_APAR <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>ListRasters<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">print</SPAN> <SPAN class="string token">"lst_ras_APAR"</SPAN><SPAN class="punctuation token">,</SPAN> lst_ras_APAR

&nbsp;&nbsp;&nbsp; <SPAN class="comment token"># list "mean" rasters (r001_TSCALAR so on)</SPAN>
&nbsp;&nbsp;&nbsp; arcpy<SPAN class="punctuation token">.</SPAN>env<SPAN class="punctuation token">.</SPAN>workspace <SPAN class="operator token">=</SPAN> ws_in_TSCALAR
&nbsp;&nbsp;&nbsp; lst_ras_TSCALAR <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>ListRasters<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">print</SPAN> <SPAN class="string token">"lst_ras_TSCALAR"</SPAN><SPAN class="punctuation token">,</SPAN> lst_ras_TSCALAR

&nbsp;&nbsp;&nbsp; <SPAN class="comment token"># list "mean" rasters (r001_WSCALAR so on)</SPAN>
&nbsp;&nbsp;&nbsp; arcpy<SPAN class="punctuation token">.</SPAN>env<SPAN class="punctuation token">.</SPAN>workspace <SPAN class="operator token">=</SPAN> ws_in_WSCALAR
&nbsp;&nbsp;&nbsp; lst_ras_WSCALAR <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>ListRasters<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">print</SPAN> <SPAN class="string token">"lst_ras_WSCALAR"</SPAN><SPAN class="punctuation token">,</SPAN> lst_ras_WSCALAR

&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> len<SPAN class="punctuation token">(</SPAN>lst_ras_APAR<SPAN class="punctuation token">)</SPAN> <SPAN class="operator token">==</SPAN> len<SPAN class="punctuation token">(</SPAN>lst_ras_TSCALAR<SPAN class="punctuation token">)</SPAN> <SPAN class="operator token">==</SPAN> len<SPAN class="punctuation token">(</SPAN>lst_ras_WSCALAR<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">print</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">"each list has equal amount of rasters, let's assume they match..."</SPAN><SPAN class="punctuation token">)</SPAN>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">for</SPAN> i <SPAN class="keyword token">in</SPAN> range<SPAN class="punctuation token">(</SPAN>len<SPAN class="punctuation token">(</SPAN>lst_ras_APAR<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ras_APAR <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>Raster<SPAN class="punctuation token">(</SPAN>os<SPAN class="punctuation token">.</SPAN>path<SPAN class="punctuation token">.</SPAN>join<SPAN class="punctuation token">(</SPAN>ws_in_APAR<SPAN class="punctuation token">,</SPAN> lst_ras_APAR<SPAN class="punctuation token">[</SPAN>i<SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ras_TSCALAR <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>Raster<SPAN class="punctuation token">(</SPAN>os<SPAN class="punctuation token">.</SPAN>path<SPAN class="punctuation token">.</SPAN>join<SPAN class="punctuation token">(</SPAN>ws_in_TSCALAR<SPAN class="punctuation token">,</SPAN> lst_ras_TSCALAR<SPAN class="punctuation token">[</SPAN>i<SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ras_WSCALAR <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>Raster<SPAN class="punctuation token">(</SPAN>os<SPAN class="punctuation token">.</SPAN>path<SPAN class="punctuation token">.</SPAN>join<SPAN class="punctuation token">(</SPAN>ws_in_WSCALAR<SPAN class="punctuation token">,</SPAN> lst_ras_WSCALAR<SPAN class="punctuation token">[</SPAN>i<SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">for</SPAN> ras_path <SPAN class="keyword token">in</SPAN> <SPAN class="punctuation token">[</SPAN>os<SPAN class="punctuation token">.</SPAN>path<SPAN class="punctuation token">.</SPAN>join<SPAN class="punctuation token">(</SPAN>ws_in_APAR<SPAN class="punctuation token">,</SPAN> lst_ras_APAR<SPAN class="punctuation token">[</SPAN>i<SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; os<SPAN class="punctuation token">.</SPAN>path<SPAN class="punctuation token">.</SPAN>join<SPAN class="punctuation token">(</SPAN>ws_in_TSCALAR<SPAN class="punctuation token">,</SPAN> lst_ras_TSCALAR<SPAN class="punctuation token">[</SPAN>i<SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">,</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; os<SPAN class="punctuation token">.</SPAN>path<SPAN class="punctuation token">.</SPAN>join<SPAN class="punctuation token">(</SPAN>ws_in_WSCALAR<SPAN class="punctuation token">,</SPAN> lst_ras_WSCALAR<SPAN class="punctuation token">[</SPAN>i<SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; arcpy<SPAN class="punctuation token">.</SPAN>CalculateStatistics_management<SPAN class="punctuation token">(</SPAN>ras_path<SPAN class="punctuation token">)</SPAN>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="comment token"># calculate (ras_TSCALAR.minimum wil take the minimum value of perticular raster)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">print</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">"ras_TSCALAR.minimum: {}"</SPAN><SPAN class="punctuation token">.</SPAN>format<SPAN class="punctuation token">(</SPAN>ras_TSCALAR<SPAN class="punctuation token">.</SPAN>minimum<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">print</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">"ras_WSCALAR.minimum: {}"</SPAN><SPAN class="punctuation token">.</SPAN>format<SPAN class="punctuation token">(</SPAN>ras_WSCALAR<SPAN class="punctuation token">.</SPAN>minimum<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ras_GPP <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">(</SPAN>ras_APAR <SPAN class="operator token">*</SPAN> <SPAN class="number token">1.48</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="operator token">*</SPAN> <SPAN class="punctuation token">(</SPAN>ras_TSCALAR<SPAN class="punctuation token">.</SPAN>minimum <SPAN class="operator token">*</SPAN> ras_WSCALAR<SPAN class="punctuation token">.</SPAN>minimum<SPAN class="punctuation token">)</SPAN>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="comment token"># save raster</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ras_name <SPAN class="operator token">=</SPAN> lst_ras_APAR<SPAN class="punctuation token">[</SPAN>i<SPAN class="punctuation token">]</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ras_num <SPAN class="operator token">=</SPAN> ras_name<SPAN class="punctuation token">[</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">:</SPAN><SPAN class="number token">4</SPAN><SPAN class="punctuation token">]</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; out_name_GPP <SPAN class="operator token">=</SPAN> os<SPAN class="punctuation token">.</SPAN>path<SPAN class="punctuation token">.</SPAN>join<SPAN class="punctuation token">(</SPAN>ws_out_GPP<SPAN class="punctuation token">,</SPAN> <SPAN class="string token">'r{0}_GPP'</SPAN><SPAN class="punctuation token">.</SPAN>format<SPAN class="punctuation token">(</SPAN>ras_num<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">print</SPAN> out_name_GPP
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ras_GPP<SPAN class="punctuation token">.</SPAN>save<SPAN class="punctuation token">(</SPAN>out_name_GPP<SPAN class="punctuation token">)</SPAN>

&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">else</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">print</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">"raster list have unequal number of items, aborting process..."</SPAN><SPAN class="punctuation token">)</SPAN>

&nbsp;&nbsp;&nbsp; arcpy<SPAN class="punctuation token">.</SPAN>CheckInExtension<SPAN class="punctuation token">(</SPAN><SPAN class="string token">"Spatial"</SPAN><SPAN class="punctuation token">)</SPAN>


<SPAN class="keyword token">if</SPAN> __name__ <SPAN class="operator token">==</SPAN> <SPAN class="string token">'__main__'</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp; main<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

What I changed was the way the rasters are extracted from the lists and I included a calculate statistics since for some reason they are not present and that caused the minimum value to be None.

ShouvikJha

Hi Dan Patterson‌, Thanks, I am trying to follow your suggestion

ShouvikJha

Hi Xander Bakker‌, please can you look at the code. Thanks

DanPatterson_Retired

It is safer to cast the iterable as a list

a_list <SPAN class="operator token">=</SPAN> <SPAN class="punctuation token">[</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">2</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">4</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">3</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">7</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">6</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">5</SPAN><SPAN class="punctuation token">]</SPAN>

counter <SPAN class="operator token">=</SPAN> <SPAN class="number token">0</SPAN>

<SPAN class="keyword token">for</SPAN> a_value <SPAN class="keyword token">in</SPAN> a_list<SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">print</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">"number {} has a value of {}"</SPAN><SPAN class="punctuation token">.</SPAN>format<SPAN class="punctuation token">(</SPAN>counter<SPAN class="punctuation token">,</SPAN> a_value<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp; counter <SPAN class="operator token">+=</SPAN> <SPAN class="number token">1</SPAN>
&nbsp;&nbsp;&nbsp; 
number <SPAN class="number token">0</SPAN> has a value of <SPAN class="number token">1</SPAN>
number <SPAN class="number token">1</SPAN> has a value of <SPAN class="number token">2</SPAN>
number <SPAN class="number token">2</SPAN> has a value of <SPAN class="number token">4</SPAN>
number <SPAN class="number token">3</SPAN> has a value of <SPAN class="number token">3</SPAN>
number <SPAN class="number token">4</SPAN> has a value of <SPAN class="number token">7</SPAN>
number <SPAN class="number token">5</SPAN> has a value of <SPAN class="number token">6</SPAN>
number <SPAN class="number token">6</SPAN> has a value of <SPAN class="number token">5</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

the way you have it you are passing a list as an iterable, so the whole list is passed.

If you want individual values from those lists then you can enclose them then unpack

<SPAN class="keyword token">for</SPAN> a_value <SPAN class="keyword token">in</SPAN> <SPAN class="punctuation token">[</SPAN><SPAN class="operator token">*</SPAN>a_list<SPAN class="punctuation token">,</SPAN> <SPAN class="operator token">*</SPAN>a_list<SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">print</SPAN><SPAN class="punctuation token">(</SPAN>a_value<SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp; 
<SPAN class="number token">1</SPAN>
<SPAN class="number token">2</SPAN>
<SPAN class="number token">4</SPAN>
<SPAN class="number token">3</SPAN>
<SPAN class="number token">7</SPAN>
<SPAN class="number token">6</SPAN>
<SPAN class="number token">5</SPAN>
<SPAN class="number token">1</SPAN>
<SPAN class="number token">2</SPAN>
<SPAN class="number token">4</SPAN>
<SPAN class="number token">3</SPAN>
<SPAN class="number token">7</SPAN>
<SPAN class="number token">6</SPAN>
<SPAN class="number token">5</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

Or if you need to pair objects, then you can use zip (I think it works in python 2, but it certainly works in python 3.

<SPAN class="keyword token">for</SPAN> a_value <SPAN class="keyword token">in</SPAN> list<SPAN class="punctuation token">(</SPAN>zip<SPAN class="punctuation token">(</SPAN>a_list<SPAN class="punctuation token">,</SPAN> a_list<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">print</SPAN><SPAN class="punctuation token">(</SPAN>a_value<SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp; 
<SPAN class="punctuation token">(</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">1</SPAN><SPAN class="punctuation token">)</SPAN>
<SPAN class="punctuation token">(</SPAN><SPAN class="number token">2</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">2</SPAN><SPAN class="punctuation token">)</SPAN>
<SPAN class="punctuation token">(</SPAN><SPAN class="number token">4</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">4</SPAN><SPAN class="punctuation token">)</SPAN>
<SPAN class="punctuation token">(</SPAN><SPAN class="number token">3</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">3</SPAN><SPAN class="punctuation token">)</SPAN>
<SPAN class="punctuation token">(</SPAN><SPAN class="number token">7</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">7</SPAN><SPAN class="punctuation token">)</SPAN>
<SPAN class="punctuation token">(</SPAN><SPAN class="number token">6</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">6</SPAN><SPAN class="punctuation token">)</SPAN>
<SPAN class="punctuation token">(</SPAN><SPAN class="number token">5</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="number token">5</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

In short... make your iterable explicit and don't rely on providing the iterable as you have done

ShouvikJha

Dan Patterson‌, please can I get an example, it will help me to understand further

DanPatterson_Retired

to use …. for in …. syntax you need to provide an iterable like a list

for ras_name in [lst_ras_APAR, lst_ras_TSCALAR, lst_ras_WSCALAR]: # note the encompasing [ ]

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