I've been developing some Great Lakes scenery, starting with a 1 x 1 degree area, using TerraGear and unsmoothed NLCD data. I've encountered some issues and I'm wondering if anyone can help me overcome them.
1. Lake elevation: In the area around KMCD, Lake Superior surrounds several islands. The land is significantly elevated above Lake Superior (and internal lakes), resulting in cliffs along the edges, unlike reality where there are no cliffs. There is also a significant difference between the WS2.0 lake and the "new" lake, but I assume that is the normal issue at the boundary of a newly generated tile. However, the difference is greater than I have seen when I've developed scenery in other (land) areas.
2. Holes: The holes seem to be as deep as the "new" lake is below the greater landmass and are filled with either water OR a land texture. I assume these are due to some areas with no elevation or NLCD data, but I thought NLCD covers an entire land area with data and, since the areas are filled, it would seem like NLCD data is in the spot of the hole. Unlike with my previous use of NLCD data, I got the normal DN11, DN21, etc. areas plus a DN00. I have searched for what DN00 is but have not found an answer. Looking in QGIS as I toggle DN00 on and off, I see only a few areas identified as DN00, although the feature count indicates 3691 in the tile. Any idea what these might be?
3. osm2city roads: I've placed an osm2city build, using the WS2.0 data as a base, over the newly created scenery. Most roads appear but some do not. I'm assuming that once the new scenery is in a decent state I should regenerate the osm2city data using the new scenery as a base and the roads should all appear.
4. Smoothing NLCD: If anyone has a script used to gently smooth NLCD data, or Grass setting they've used to smooth it, I would very much appreciate learning what has worked instead of re-inventing the wheel.
Any help will be very much appreciated!
Thanks to @legoboyvdlp's TerraGear tutorial, I have done things a little differently than I have before and it's made things easier, especially cropping the area to be generated. Thank you, @legoboyvdlp!