Hi guys, I'm totally lost and on the verge of a mental breakdown. I'm trying to write a script for an automatic CostPath analysis and I'm getting very weird results and errors. Basicly what I want is this:I'm creating a CostDistance Raster dataset and the backlink set by multiplying different Raster Datasets with randomly generated numbers and using a polygon-feature class as the starting point. so far so good. Then I create four random points, constraint by four polygones to act as the destination. When I start the CostPath analysis, I get this error:Traceback (most recent call last): File "E:\My Dropbox\Diss\Python Workspace\GIS Tutorial\src\test_rand.py", line 216, in <module> outCostPathFrankreich = CostPath(PFrankreich, outCostDist, outBkLinkRaster, "BEST_SINGLE", "FID") File "C:\Programme\ArcGIS\Desktop10.0\arcpy\arcpy\sa\Functions.py", line 693, in CostPath destination_field) File "C:\Programme\ArcGIS\Desktop10.0\arcpy\arcpy\sa\Utils.py", line 47, in swapper result = wrapper(*args, **kwargs) File "C:\Programme\ArcGIS\Desktop10.0\arcpy\arcpy\sa\Functions.py", line 686, in wrapper destination_field) File "C:\Programme\ArcGIS\Desktop10.0\arcpy\arcpy\geoprocessing\_base.py", line 474, in <lambda> return lambda *args: val(*gp_fixargs(args))arcgisscripting.ExecuteError: ERROR 010045: COSTPATH: The number of FROM cells is 0.ERROR 010067: Error in executing grid expression.Funny thing: When I look in my folder, there are four point features created, each with a point within my constraining feature class. So the points exist, but is does not work...here are some code snippets that may help to understand the mess I made:I dont post all the code to keep it small, if you need it, then please ask!
import sys
sys.path.append("C:/Programme/ArcGIS/Desktop10.0/arcpy/arcpy")
import random
import arcpy
from arcpy import env
from arcpy.sa import *
arcpy.env.overwriteOutput = True
arcpy.CheckOutExtension("Spatial")
#load constraining feature
ZielFrankreich = "E:/CORINE/CP_Paper3/Auswertung/basedata.gdb/FrancePointBuffer"
#create the random point
PFrankreich= arcpy.CreateRandomPoints_management("E:/CORINE/CP_Paper3/Auswertung", "randFrankreich", ZielFrankreich, "", 1)
#CostPath analysis, outCostDist, outBkLinkRaster have already been created, but to keep the codeblock as small as possible i dondt post it
outCostPathFrankreich = CostPath(PFrankreich, outCostDist, outBkLinkRaster, "BEST_SINGLE", "FID")
If anyone has any idea that would be great. As I said, I'm so completly frustrated.... If you need any additional information, please ask.Cheers, thanks a lot in advance,Dominik
