What tolerances to pick for simplifying coast polygons?

On my quest for my own world map I can’t use coast (longitudinal domain limited to 360°) or a GSHHG dump (not closed polygons). Please see the other thread for details.

I therefore think about using the Open Street Map coastlines but need to simplify them first as they are 1.6GB uncompressed ASCII madness. That high resolution won’t be needed in the final plot. After searching the docs I was relieved to find I can use gmtsimplify -T for the heavy lifting.

Now my question: What values for -T are good starting values when I want resolutions similar to coast -Dc/l/i/h/f?

25k, 5k, 1k, 0.2k, 40m

1 Like

Thank you for the insight, Paul