I am fairly new to GIS, and brand new to ArcGIS Pro (came from ArcMap).

I recently created a visual basic program that generates an image from the Google Static Maps API with a respective ESRI world file (.PGW). Below is an example image with the corresponding world file:



The image is named "staticmap.png" and the world file is "staticmap.pgw", they are both saved in the same folder. Here are some of the things I've tried so far:

  • Loading it in without the world file present, it loads in the Pacific Ocean.
  • Assigning the Mercador Web Map and then loading the image with world file in my map, which results in it appearing outside of Africa (it should be in southern oregon).
  • Deleting all references to the image / world file in ArcGIS Pro and regenerating both, loading into my map without a projection (It loads in the same spot it loaded without a world file present). This step convinced me that the program is ignoring my world file for some reason, maybe I wrote it incorrectly?
  • Tried it in ArcMap with the same results.
  • What spatial reference are you assigning to the layer? – Kirk Kuykendall Mar 26 '19 at 18:09
  • According to Googles support page for the Static Maps API their imagery uses the WGS 1984 Web Mercador projection, I am using that as the spatial reference. – dashton Mar 26 '19 at 18:11
  • Did you try replacing the -122 and 42 in the pgw with their web mercator coordinates for that location? – Kirk Kuykendall Mar 26 '19 at 18:24
  • Ah you might be onto something here, I just used the Lat Long coordinates from points on google maps. Let me check and see. – dashton Mar 26 '19 at 18:30

ArcGIS IS reading your pgw file. Your file points the x1, y1 point (the two last numbers in your pgw file) to -122.8704705, 42.4147755, which is in Web Mercator, near Africa. When it should be pointing to something like -13396443.965, 5568945.439 (coordinates near Oregon).

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  • Thank you for this! Those coordinates I am using are the Lat Long values from Google Maps, are they GPS units? Sorry I am a complete novice with coordinates and transformations. – dashton Mar 26 '19 at 18:34
  • Yes, when I open your file in geographic coordinate system, the image appears in Medford. Geographic coordinates systems use degrees as units, the Web Mercator is a projected coordinate system and uses meters as units. – Lucas Mar 26 '19 at 18:52
  • Be careful to not just change coordinates because the cell values will be still wrong. Use ArcToolbox->Data Management Tools->Projections and Transformations->Raster->Project Raster and set the gcs initial projection and the Webmercator output projection (search for 3857 epsg). I could reproject it changing extension to tif. The tfw should be like this: 22.2355311179 0.0000000000 0.0000000000 -16.4137715288 -13677876.6464319360 5223316.0736071728 – Lucas Mar 26 '19 at 19:10

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