The Dark Robin said:
I have a very high vert map (about 13x of native) so I want to eliminate 90% of the sea vertexes. Is there an easy way to do that without manually going through to delete every single one individually?
You should be working on your map in a 3D editing software. Export it using Thorgrims or one of the tools I think existed, or swy's cartographer which is basically made with exporting maps in mind, then import it into your preferred 3D editor - be it 3DS Max, Maya, or Blender, and maybe even Wings3D, though I'm not so sure about it.
In any case, go to your preferred powerful 3D editing application, import your map, set the "distance", "tolerance", "threshold" or whatever similar value the software provides you with as a parameter to the weld operation, then select the vertices you need welded, then weld them all. Having selected the proper threshold mesn that your vertices will consider themselves available for welding, whereas if the distance between two vertices is more than the threshold, then they would not weld together.
Aside from that, there's also the "Target Weld" operation (or any similarly called ones) which can be used to fine-tune welding by allowing you to select a vertex (or a few), then manually weld it(/them) to another vertex where you consider it.
After you're done, export the map as .obj, import it back in the map editor. Finished!