Another small step forward
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http://www.bigben.id.au/terragen/?p=8>
Starting with a brand new terrain set (Monument Valley)
Producing a kml file is now useful to me for checking the coverage of the padding terrains so it doesn't really matter what you think... I'll be posting them on my site anyway.
Each tile image will have a different hue, and the filename in the south east corner.
Progress was a little slow 'cos I'm still sorting out workflows with the new update of GlobalMapper which now nicely exports kml/kmz, although it's a bit awkward as I'm workng with UTM coordinates (metres) and the kml export is Geographic projection so I have to recalculate the corner coordinates for each tile.
These overlays will be particularly useful for this area where there will be adjacent terrain sets with considerable overlap (Goosenecks just to the north), and for planning larger terrains to be shared between them... e.g. Monument Valley and Goosenecks will have 10m (resolution) and 20m terrains, and then share common 50m and 100m terrains... eventually they will share a common terrain with the Grand Canyon terrain set to the east.