Hi,

> It seems overview-dem is generated for a larger rectangle area, not
> only for the existing map area. For areas out of map area
> (areasa.list,..) I would expect DEM is treated as 0 elevation.

I agree that this doesn't look good. Would be nice, if mkgmap could use only HGT that cover detailed tiles. I think mkgmap already gather list of tiles and their background areas, this could be used for DEM.

--
Best regards,
Andrzej
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