I am trying to use the "Polygon to Raster" tool on a building extents polygon file to create a raster with the exact extents and cell size as an existing flood depth raster. Even though I have added my desired raster extent in the snap raster option in the Environment settings and defined the cell size, the result does not have the same extents. Furthermore, I made sure that they have the same projection (WGS_1984_UTM). I really need them to have the same extents and cell size as I want to do some calculations between them (e.g. calculate the flood depth at the buildings location). Any idea why this is happening?

  • Have you set the coordinate systems up correctly / identical? Commented Jul 7, 2018 at 8:57
  • 3
    You should try and only ask one question per post and your extra question will also be almost impossible to answer.
    – Bera
    Commented Jul 7, 2018 at 8:59
  • Allan, yes they both have the same projection. BERA, I am sorry for the 2nd question. It is my first post and I was not that familiar with the rules. I have edited my post and removed the extra question.
    – Panos
    Commented Jul 8, 2018 at 17:21
  • Are you trying to copy a raster or convert a polygon-based feature class into a raster? Can you edit your question and include the extents, coordinate systems, other metadata plus screenshots of part of the layers so we can see what's happening?
    – mkennedy
    Commented Jul 8, 2018 at 20:42
  • arcpy.env.extent = r'c:\your\existing\raster' (resources.arcgis.com/en/help/main/10.2/index.html#//…), setting snapraster (resources.arcgis.com/en/help/main/10.2/index.html#/Snap_Raster/…) and cellsize just ensures the cell boundaries align by using an existing origin. What calculations need them to be precisely the same size? Commented Jul 8, 2018 at 23:25

1 Answer 1


I realized that to have the rasterized polygons with the same extents and cell size, you have to both choose the desired raster as the extents AND as the snap raster. This resulted in a raster with the exact same extents and cell size as the desired one.

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