I worked this out once but I forgot how I did it. Somehow the grid size created a whole number of cells.

I have a map with the following extents:

xmin = -20037508.3427892439067364

xmax = 20037508.3427892439067364

ymin = -20037508.3427892439067364

ymax = 20037508.3427892439067364

I want to generate a grid where each cell is 500 by 500 pixels (at 1:250,000 scale). How do I convert the extent values from metres to pixels (at 1:250,000 scale)?

  • Your ymax abd ymin values are the same... I think something is wrong there - we would also need to know the unit of the coordinates to have any idea of the factors needed (you can edit the question) May 28, 2022 at 15:12
  • That was a typo. I've corrected it now. The extents are in metres as stated.
    – Will
    May 28, 2022 at 18:06
  • Can anyone help with this?
    – Will
    Jun 2, 2022 at 9:09


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