[mkgmap-dev] HGT - getElevation()

Tue Jan 16 15:36:22 GMT 2018

Hi Gerd,

I have tried to align pbf bbox with HGT. I have ceated 2 maps, one with 
god alignment and second with left and top edge moved by 1/2 HGT pixel 
size. I have used HGT with resolution 3600, so the movement was about 
15m. I think shading is the same on both maps. There is no obvious 
change, but I can't make BaseCamp to display maps at exactly the same 
position, so there is a small movement of all objects. See pictures:
http://files.mkgmap.org.uk/download/396/hgt-aligned.png
http://files.mkgmap.org.uk/download/397/hgt-nonaligned.png

DEM layer is the same for both maps, position and size exactly the same.

I have found, why shading on your map looks more detailed. You have 
created only single layer of DEM, while I use 4 layers. Shading with 
multiple layers looks softer. Another weird effect is that with single 
layer, shading gets softer, when you set "Map Detail" to higher in 
Mapsource. With multilayer is opposite, probably Mapsource switches 
between layers.

-- 
Best regards,
Andrzej