[英]ArcGIS Raster Calculator Error in Python For-Loop
我正在通過python在ArcGIS計算器中執行一個簡單的for循環。 我想使用從第一年(r2005)到第二年(r2009)的封面類生成過渡圖。 這是代碼:
# Importing libraries
import arcpy, sys, string, os, arcgisscripting, dircache
import numpy as np
from arcpy import env
from arcpy.sa import *
# Creating the geoprocessor object
gp = arcgisscripting.create()
# Setting environment
arcpy.env.compression = "LZW"
# Check out the ArcGIS Spatial Analyst extension license
arcpy.CheckOutExtension("Spatial")
# Reading data
classes = np.genfromtxt("Globcover_Legend_Neotropics.txt", dtype="int")
r2005 = Raster("2005_Clip.tif")
r2009 = Raster("2009_Clip.tif")
# Creating transition rasters
for i in classes:
for j in classes:
#OPTION1
#outEqualTo1 = r2005==i
#outEqualTo2 = r2009==j
#transition_raster = (outEqualTo1) & (outEqualTo2)
#OPTION2
transition_raster = (r2005 == i) & (r2009 == j)
transition_raster.save(str(i)+"_"+str(j)+".tif")
print (str(i)+"_"+str(j))
對象“classes”是一個包含要比較的封面類的numpy數組:
>>> classes
array([ 14, 20, 30, 40, 50, 60, 70, 100, 110, 120, 130, 140, 150,
160, 170, 180, 190, 200, 210, 220])
當我使用循環中的任何元素運行代碼時,它運行完美。 例如:
>>> i=j=14
>>> transition_raster = (r2005 == i) & (r2009 == j)
>>> transition_raster.save(str(i)+"_"+str(j)+".tif")
但是,當我運行完整的for循環時,我收到此錯誤:
Traceback (most recent call last):
File "D:\Cover\GlobCover\transitions.py", line 31, in <module>
transition_raster = (r2005 == i) & (r2009 == j)
File "C:\Program Files (x86)\ArcGIS\Desktop10.2\arcpy\arcpy\sa\Functions.py", line 3831, in EqualTo
in_raster_or_constant2)
File "C:\Program Files (x86)\ArcGIS\Desktop10.2\arcpy\arcpy\sa\Utils.py", line 47, in swapper
result = wrapper(*args, **kwargs)
File "C:\Program Files (x86)\ArcGIS\Desktop10.2\arcpy\arcpy\sa\Functions.py", line 3828, in Wrapper
["EqualTo", in_raster_or_constant1, in_raster_or_constant2])
TypeError: expected a raster or layer name
我已經嘗試了代碼中的兩個選項(參見代碼),我得到了同樣的錯誤。 有什么想法嗎? 在此先感謝並歡呼!
你知道值14
可以工作,但是你得到的是一個TypeError
包含了返回classes
的循環。 14
的類型是int
,因此在進行比較之前,請嘗試將i
和j
類型轉換為int
:
for i in classes:
for j in classes:
transition_raster = ( (r2005 == int(i)) & (r2009 == int(j)) )
# added typecasts: ^^^^ ^ ^^^^ ^
...
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