I'm re-projecting the 1:110m Land shapefile from Natural Earth in MAPublisher from WGS84 to Van der Grinten. When I do, portions of the land polygon switch sides from East to West, creating bands across the map area. I've seen this with other NE datasets and MAPub transformations as well. Some files and projections work, some don't.
Any idea why this happens and how to avoid or fix it? I feel like I've asked this questions before but can't find my post, I apologize if its been answered in the past.
Edited to add: I checked a few other projections, Winkel Triple, Times, WGS World Mercator... same results. PS, this is the newest NE data set and the most recent MAPub version.
This issue may occur when transforming your data it has extents outside of the envelope of 180W - 180E.
Try checking to see if this is the case with the MAP Location tool, if so, use the MAP Vector crop tool to trim the map extents ever so slightly and attepmt retransforming. Are you centering the transformation on 0,0 or are you setting differing central meridians?
If importing new data you can very if this is the case by using the Advanced importer. First enable the "show extents in Advanced Import table" option with the MAPublisher preferenced Import options then select a dataset for import. You will see the extents denoted by the LLx & URy and should give you a clue if the incoming data should be adjusted. Hope this helps.