topic Re: Generating new output names after each iteration in ArcGIS API for Python Questions

Generating new output names after each iteration

Sam_Roodbar — Thu, 06 Dec 2018 21:54:24 GMT

Hello Everyone,

I'm trying to write a script that will take a look at a list of county boundaries and then take each boundary and use it as a mask on a raster so that I can do Extract By Mask. Ideally I would like to have the county names on the output but I cannot figure out a way to do that, but any unique name at this point would do. Here is the script that I use:

>>> import os
>>> import arcpy
>>> from arcpy import env
>>> from arcpy.sa import *
>>> env.workspace = "C:/Users/s/Desktop/S/test"
>>> inRaster = "escrec"
>>> counter = 1
>>> ctyList = arcpy.ListFeatureClasses ("*.shp")
>>> for shp in ctyList:
... out = arcpy.sa.ExtractByMask(inRaster,shp)
... out.save("C:/Users/s/Desktop/test/out/masked"+ counter)
... counter = counter+2
...
>>>

I tried using this counter thing but it doesn't work due to concatenate issue (str and numbers). Anyone has any suggestions or tricks that they have done? I tried setting the counter as my "ctyList" but since feature have .shp it doesn't allow that to save.

extract by mask‌ acrpy#

Re: Generating new output names after each iteration

SteveLynch — Thu, 06 Dec 2018 22:08:34 GMT

out.save(r"C:\Users\s\Desktop\test\out\masked"+ str(counter) + ".tif")

Re: Generating new output names after each iteration

Sam_Roodbar — Thu, 06 Dec 2018 22:51:52 GMT

Thank you, I tried it and it works but the names of outputs were strange.

I specified counter as 01001 (for the first county) but the outputs started 513!!

is there a way to have the name of the shp s for output?

Re: Generating new output names after each iteration

DanPatterson_Retired — Sun, 12 Dec 2021 10:15:14 GMT

perhaps....

counter = 100

shp = "test.shp"

pth = r"C:\Users\s\Desktop\test\out\masked"

out = "{}\\{}{}.tif".format(pth, shp[:-4], counter)

out
'C:\\Users\\s\\Desktop\\test\\out\\masked\\test100.tif'‍‍‍‍‍‍‍‍‍‍‍‍

Re: Generating new output names after each iteration

Sam_Roodbar — Mon, 17 Dec 2018 19:13:31 GMT

I worked out another way to do the same, much easier:

>>> import os
>>> import arcpy
>>> from arcpy import env
>>> env.workspace = "C:\XXX"
>>> ctyList = arcpy.ListFeatureClasses ("*.shp")
>>> inRaster = "nlcdrecmosaic"
>>> for shp in ctyList:
... CtyName = shp.split('.')[0]
... out= arcpy.sa.ExtractByMask(inRaster,shp)
... out.save("C:\XXX\out\mskd"+ CtyName)
...