GIS Webgeo data from Blender to Sketchup?

Hello community,
Quite recently I have tried exporting the GIS Web geodata of a country in Blender to Sketchup. After selecting the area I wished to export from Blender and revealing its terrain, I exported the file as a collada and attempted to import this to Sketchup, but it only imported a picture of the map itself, and not terrain mesh. I have tried exporting as an stl but this reduces the quality of the mesh significantly. I was wondering if anyone would know how to export large mesh terrain from GIS Blender into Sketchup. I would really appreciate the help.