arcgis union python错误

Question

Trying to loop through multiple spatial extents to create 17 unions of 4 different layers.

I'm running ArcGIS Desktop 10.0, ArcInfo (advanced).

Gridnums = range(1,18)
for i in Gridnums:
    #vis6class = ws + "/" + "TVvis6class_G" + str(i)
    inList = arcpy.ListFeatureClasses("*ProcGrid_"+str(i), "")
    print "inList: " + str(inList)
    arcpy.Union_analysis([InList], ws + "/" + "TVvis6class_G" + str(i))
    print "Union completed for Grid " + str(i)
    arcpy.AddField_management(vis6class, "Object", "TEXT", 10)
    arcpy.AddField_management(vis6class, "Revert", "SHORT")
    rows = arcpy.UpdateCursor(vis6class)
    for row in rows:
        row.Revert = 0
        if row.Road == 1:
            row.Object = Road
            rows.updateRow(row)
        elif row.Water == 1:
            row.Object = Water
            rows.updateRow(row)
        elif row.Building == 1:
            row.Object = Building
            rows.updateRow(row)
        else:
            row.Object = row.Landcover
            rows.updateRow(row)

Error Code (not very helpful):

inList: [u'Road_ProcGrid_1', u'FPs_S_ProcGrid_1', u'er_di_ProcGrid_1', u'TV_v_ProcGrid_1']

Traceback (most recent call last): File "E:\\Projects\\TV\\01_Python\\LandCover\\LC_2_Vector_Tile_6class_091312.py", line 48, in arcpy.Union_analysis([InList], ws + "/" + "TVvis6class_G" + str(i)) File "C:\\Program Files\\ArcGIS\\Desktop10.0\\arcpy\\arcpy\\analysis.py", line 483, in Union raise e RuntimeError: Object: Error in executing tool

I know this is programming forum over ArcGIS, but I've posted onto the esri forums as well, with lots of views but little feedback. The tool itself runs, if I manually select each dataset for a particular extent, so the problem has to be in the coding.

Thanks for any thoughts.

Rich

Answer 1

你有[InList]作为输入，而不是没有引号的'inList'。

Answer 2

According to the ArcGIS online help , the Union_analysis function requires a class as second argument, when you're passing a string. Try passing an object instead.