Saving ASC files with the wrong extension produces strange results

[AlexisDrogoul]

To reproduce Run the model named Save to ASC.gaml in the library. The ASC file is correctly saved.

Now replace save cell to:"../results/grid.asc"; by save cell format:"asc" to:"../results/grid.data";, which should normally produce the same outcome (except in a .data file), and open the resulting file :

PROJCS["WGS 84 / UTM zone 48N", 
  GEOGCS["WGS 84", 
    DATUM["World Geodetic System 1984", 
      SPHEROID["WGS 84", 6378137.0, 298.257223563, AUTHORITY["EPSG","7030"]], 
      AUTHORITY["EPSG","6326"]], 
    PRIMEM["Greenwich", 0.0, AUTHORITY["EPSG","8901"]], 
    UNIT["degree", 0.017453292519943295], 
    AXIS["Geodetic longitude", EAST], 
    AXIS["Geodetic latitude", NORTH], 
    AUTHORITY["EPSG","4326"]], 
  PROJECTION["Transverse_Mercator"], 
  PARAMETER["central_meridian", 105.0], 
  PARAMETER["latitude_of_origin", 0.0], 
  PARAMETER["scale_factor", 0.9996], 
  PARAMETER["false_easting", 500000.0], 
  PARAMETER["false_northing", 0.0], 
  UNIT["m", 1.0], 
  AXIS["Easting", EAST], 
  AXIS["Northing", NORTH], 
  AUTHORITY["EPSG","32648"]]

Expected behavior That specifying the format as asc overrides the extension of the file.

[lesquoyb]

To add more context, here is what happens when there's a mismatch between the format and the extension:

• shp produces a runtime error
• png append a .png extension to the existing one
• asc produces what you showed
• geotiff, text and json do not care about the extension and just write into the file

Also the result you get seems to be the same as if it were saved as a geotiff

[AlexisDrogoul]

I have committed a possible fix -- but only tested it with the asc + data combination. Please tell if it solves the other problems too !

[lesquoyb]

I don't know if it's the result of this fix or if it was something already present, but I noticed that saving the cell in png with png extension result in a new png file but also a prj file. Is that an expected behaviour?