I'm running into an issue with a python script that includes the Extract by Mask command. The script always runs as expected when it's launched from the ArcToolbox. However, when I run the script from an IDE or the .Net GUI of the application that's intended to run the script, the Extract By Mask command returns ERROR 999999: Error executing function; for a particular dataset, the script may run as expected 2 out of 10 times. Here's a snippet of the code, the last like being the one that produces the error:
GPMsg("t", "Create facmask")
fdr = Raster(tmp_fdr)
cat = Raster(tmp_cat)
swnet = Raster(tmp_swnet)
env.cellSize = fdr.meanCellHeight
env.extent = fdr.extent
env.snapRaster = fdr.catalogPath
env.outputCoordinateSystem = fdr.spatialReference
# create boolean rasters (1=True, 0=False)
# outrpu: cells outside RPU catchments (0=inside, 1=outside)
outrpu = IsNull(cat)
# swnet1: cells on flownet (without waterbody cells)
swnet0 = Con(IsNull(swnet), 0, swnet)
swnet1 = Con(swnet0 == 1, 1 , 0)
# erase those that coincide with adjacent flowlines (except outflow)
where = "PurpCode = 'AO'"
lyrAddLine = arcpy.MakeFeatureLayer_management(burnaddline,
"_afl", where)
if procutil.RowTest(lyrAddLine):
bufsize = fdr.meanCellHeight * 1.42 * 0.5
tbuf = arcpy.Buffer_analysis(lyrAddLine, "tline.shp", bufsize)
ao_cells = ExtractByMask(swnet1, tbuf) # ERROR 999999: Error executing function
