The resolution of the world map is 5800x2900. In the case of Urgaleon, it is the same as in the regional map I posted (1120x1010). I've been a bit reluctant to use Wilbur's Dilate+Erode for fear of losing details, but maybe if I do the Wilbur-processing at 2x resolution it becomes less of a problem.
Btw, here is how the world map looks like now (with the deglaciated topography):
Aduhr VI.png
What is a bit of an issue are the "stretch marks" resulting from re-projecting the polar-centric equirectangular back to regular equirectangular via GProjector. While browsing through Worldbuilding Pasta's blog a while back, I noticed he had an
alternate method of reprojecting maps, using a Python-script as I recall. I think the main benefit was the lack of GProjector's resolution limits, anyone tried out if it also produces less distortion?