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Rectangle for Clip_management tool in arcpy

RichNauman

Hello,
I have been struggling to get this part of a script to work. If I hard code the four coordinate pairs: like this:

rectangle = "-121.677618762735 42.7497214280392 -119.35205017646 45.3659860875993"

it works but we have to remember to change this every time we change study areas. When I run the script pasted below I get the following error:

Traceback (most recent call last):
File "C:\Python26\ArcGIS10.0\Lib\site-packages\pythonwin\pywin\framework\scriptutils.py", line 325, in RunScript
    exec codeObject in __main__.__dict__
File "C:\Documents and Settings\Administrator\Desktop\clip_test.py", line 13, in <module>
    arcpy.Clip_management (raster, rectangle, outraster)
File "C:\Program Files\ArcGIS\Desktop10.0\arcpy\arcpy\management.py", line 7692, in Clip
    raise e
ExecuteError: Failed to execute. Parameters are not valid.
ERROR 000840: The value is not a Envelope.
Failed to execute (Clip).

Here is my code:

import arcpy
arcpy.env.workspace = r"C:\Temp"

raster = "some_raster"
outraster = r"C:\output_raster"
extent = r"C:\GIS_Data\test_extent2.shp"

desc = arcpy.Describe(extent)
rectangle = desc.extent

print rectangle

# Clip_management (in_raster, rectangle, out_raster, {in_template_dataset}, {nodata_value}, {clipping_geometry})
arcpy.Clip_management (raster, rectangle, outraster)

print "Success!"

What am I missing?
Thanks!

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ChrisSnyder

Try this:

import arcpy
arcpy.env.workspace = r"C:\Temp"
raster = "some_raster"
outraster = r"C:\output_raster"
extentFC = r"C:\GIS_Data\test_extent2.shp"
dsc = arcpy.describe(extent)
arcpy.Clip_management (raster, dsc.extent, outraster)
###or if you want to mask it using extentFC as the outline:
##arcpy.Clip_management (raster, dsc.extent, outraster, extentFC, "", "CLIPPINGGEOMETRY")

RichNauman

Thanks but I still get the "The value is not a Envelope." error:

Traceback (most recent call last):
File "C:\Python26\ArcGIS10.0\Lib\site-packages\pythonwin\pywin\framework\scriptutils.py", line 325, in RunScript
    exec codeObject in __main__.__dict__
File "C:\Documents and Settings\Administrator\Desktop\clip_test.py", line 15, in <module>
    arcpy.Clip_management (raster, dsc.extent, outraster)
File "C:\Program Files\ArcGIS\Desktop10.0\arcpy\arcpy\management.py", line 7692, in Clip
    raise e
ExecuteError: Failed to execute. Parameters are not valid.
ERROR 000840: The value is not a Envelope.
Failed to execute (Clip).

ChrisSnyder

Hmm... Maybe a bug in v10?

Here's an excerpt of some v9.3 code that works for me:

#Process: Creates a blank GDB
fgdbName = "oesf_score_gnn_raster"
fgdbPath = root + "\\" + fgdbName + ".gdb"
gp.CreateFileGDB_management(root, fgdbName); showGpMessage()

#Process: Extract the OESF
hcpUnitFC = r"\\Snarf\am\div_lm\ds\gis\tools\sde_connections_read\ropa_gis_layer_user.sde\ROPA.HCPUNIT"
oesfFC = fgdbPath + "\\oesf"
gp.Select_analysis(hcpUnitFC, oesfFC, "HCPUNIT_NM = 'OESF'"); showGpMessage()

#Process: Buffer the oesf
oesfBufferUnits = "FEET"
oesfBufferDistance = "35000" #NOTE: This MUST be the same buffer distance as in 'nso_make_path_distance_grids_v93.py'
oesfBufferFC = fgdbPath + "\\oesf_buff_" + str(oesfBufferDistance) + oesfBufferUnits.lower()
gp.Buffer_analysis(oesfFC, oesfBufferFC, str(oesfBufferDistance) + " " + oesfBufferUnits.upper(), "FULL", "ROUND", "NONE", ""); showGpMessage()

#Process: Clip the GNN data to our area of interest
gnnReadGrd = r"\\snarf\am\div_lm\ds\gis\tools\sde_connections_read\raster_gis_layer_user.sde\SHARED_LM.GNN_20100303"
gp.extent = oesfBufferFC
gp.extent = snapExtentToRaster(gp.extent, gnnReadGrd)
gp.mask = oesfBufferFC
gp.cellsize = gnnReadGrd
gnnClipGrd = fgdbPath + "\\gnn_clip"
gp.Clip_management(gnnReadGrd, gp.extent, gnnClipGrd, oesfBufferFC, "", "CLIPPINGGEOMETRY")

DWynne

Hi Richard,
You won't be able to use a Extent object directly as input to Clip, but since you can use geometry objects, Polygon, etc. So, really it just a matter of converting that extent into a polygon.

Working from your original code, something like below should do it.

import arcpy
arcpy.env.workspace = r"C:\Temp"

raster = "some_raster"
outraster = r"C:\output_raster"
desc = arcpy.Describe(r"C:\GIS_Data\test_extent2.shp")
extent = desc.extent

rectangle = arcpy.Polygon(arcpy.Array([extent.lowerLeft, extent.upperLeft, extent.upperRight, extent.lowerRight, extent.lowerLeft]),
                          desc.spatialReference)

print rectangle

# Clip_management (in_raster, rectangle, out_raster, {in_template_dataset}, {nodata_value}, {clipping_geometry})
arcpy.Clip_management(raster, rectangle, outraster)

print "Success!"

-Dave

ChrisSnyder

Looks like I will be rewriting a lot of v9.3 code to make it arcpy compatible...

DWynne

Looks like I will be rewriting a lot of v9.3 code to make it arcpy compatible...

Sorry, I was overthinking that example way too much. It could also be done by converting the extent to a string like so:

desc = arcpy.Describe(r"C:\GIS_Data\test_extent2.shp")
extent = desc.extent

# Clip_management (in_raster, rectangle, out_raster, {in_template_dataset}, {nodata_value}, {clipping_geometry})
arcpy.Clip_management(raster, str(extent), outraster)

Hopefully, that is more agreeable
-Dave

ChrisSnyder

I like that better!

RichNauman

Thanks for the help but I am still struggling.

This script works:

import arcpy
raster = r"Y:\GIS_Data\raster1"
outraster = r"Y:\GIS_Data\delete_me"

desc = arcpy.Describe(r"Y:\GIS_Data\test_extent2.shp")
frame = str(desc.extent)
frame = str(frame [:-16])
frame = str('"' + frame + '"')
print frame

arcpy.Clip_management (raster, "-121.677618762735 42.7497214280392 -119.35205017646 45.3659860875993", outraster)
print "Done!"

But this one does not:

import arcpy
raster = r"Y:\GIS_Data\raster1"
outraster = r"Y:\GIS_Data\delete_me"

desc = arcpy.Describe(r"Y:\GIS_Data\test_extent2.shp")
frame = str(desc.extent)
frame = str(frame [:-16])
frame = str('"' + frame + '"')
print frame

arcpy.Clip_management (raster,frame, outraster)
print "Done!"

I copied and posted the output from the "print frame" statement into the clip statement to get it to work.

Any ideas?

DWynne

desc = arcpy.Describe(r"Y:\GIS_Data\test_extent2.shp")
frame = str(desc.extent)
frame = str(frame [:-16])
frame = str('"' + frame + '"')

Don't bother with the extra quotes in this last line, I'm pretty sure this is the cause of your error.

Instead, just do this (leaving out your last frame = line)...

frame = str(desc.extent)
frame = frame[:-16]

or, if your intention is to strip out all the NaN's at the end, you could also do this...

frame = str(desc.extent).strip(" NaN")

RichNauman

Thanks for the help!!!

I'm not sure where I went off track but the following works:

import arcpy
raster = r"c:\GIS_Data\some_raster"
outraster = r"c:\GIS_Data\delete_me"

desc = arcpy.Describe(r"c:\GIS_Data\test_extent2.shp")
frame = str(desc.extent)

arcpy.Clip_management (raster, frame, outraster)
print "Done!"

JenniferCorcoran

Have you tried applying this code to several rasters from different resolution source imagery? Do you get the same extents in the long run? I am having major trouble clipping my rasters to specific extents and having them come out the EXACT same. I keep getting some of them the same as I am trying to use and some with extra decimals (ex. Raster Extent Interested: 524002.75 5167611.25 542557.75 5188001.25; Raster Extent Result: 524002.74999979 5167611.25012111 542557.74999979 5188001.25012111).

Thoughts?

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