I'm trying to turn a PNG that looks like this to a shapefile with polygons that keep the categories marked by the colors on the map.

I have several maps to process, so manually tracing the polygons is not a valid option.

I tried to do this with arcpy.RasterToPolygon, but I get the following error:

Runtime error  Traceback (most recent call last):   
File "<string>", line 5, in <module>   
File "c:\program files (x86)\arcgis\desktop10.4\arcpy\arcpy\conversion.py", line 337, in RasterToPolygon     
raise e ExecuteError: ERROR 010151: No features found in c:\gis\output\control_test.shp. 
Possible empty feature class. Failed to execute (RasterToPolygon).

Is it possible to fix this error or to use another function to get to my goal?

I have the original PNG as an SVG with vector drawn polygons if that helps.

I'm trying to turn a PNG that looks like this to a shapefile with polygons that keep the categories marked by the colors on the map.

I have several maps to process, so manually tracing the polygons is not a valid option.

I tried to do this with arcpy.RasterToPolygon, from here :

import arcpy
from arcpy import env
env.workspace = "C:/data"
arcpy.RasterToPolygon_conversion("zone", "c:/output/zones.shp", "NO_SIMPLIFY",
                                  "VALUE")

In this case "zone" is the input PNG, this layer is already georeferenced to its actual location. zones.shp is the filename where I want to store the new features.

I get the following error:

Runtime error  Traceback (most recent call last):   
File "<string>", line 5, in <module>   
File "c:\program files (x86)\arcgis\desktop10.4\arcpy\arcpy\conversion.py", line 337, in RasterToPolygon     
raise e ExecuteError: ERROR 010151: No features found in c:\gis\output\control_test.shp. 
Possible empty feature class. Failed to execute (RasterToPolygon).

Is it possible to fix this error or to use another function to get to my goal?

I have the original PNG as an SVG with vector drawn polygons if that helps.

I'm trying to turn a PNG that looks like this to a shapefile with polygons that keep the categories marked by the colors on the map.

I have several maps to process, so manually tracing the polygons is not a valid option.

I tried to do this with arcpy.RasterToPolygon, but I get the following error:

Runtime error  Traceback (most recent call last):   File "<string>", line 5, in <module>   File "c:\program files (x86)\arcgis\desktop10.4\arcpy\arcpy\conversion.py", line 337, in RasterToPolygon     raise e ExecuteError: ERROR 010151: No features found in c:\gis\output\control_test.shp. Possible empty feature class. Failed to execute (RasterToPolygon).

Is it possible to fix this error or to use another function to get to my goal?

I have the original PNG as an SVG with vector drawn polygons if that helps.

I'm trying to turn a PNG that looks like this to a shapefile with polygons that keep the categories marked by the colors on the map.

I have several maps to process, so manually tracing the polygons is not a valid option.

I tried to do this with arcpy.RasterToPolygon, but I get the following error:

Runtime error  Traceback (most recent call last):    
File "<string>", line 5, in <module>    
File "c:\program files (x86)\arcgis\desktop10.4\arcpy\arcpy\conversion.py", line 337, in RasterToPolygon      
raise e ExecuteError: ERROR 010151: No features found in c:\gis\output\control_test.shp.  
Possible empty feature class. Failed to execute (RasterToPolygon).

Is it possible to fix this error or to use another function to get to my goal?

I have the original PNG as an SVG with vector drawn polygons if that helps.