Well. I don't know if you're still around here. But I made an heightmap.
If you're interested here it is:
Original HD map (probably near real scale):https://www.dropbox.com/s/fqiy5so0i7tdhba/Lisbon958x500.ppm
Lower res (just a compressed version):https://www.dropbox.com/s/04eawqpi1fqjy2s/Lisbon384x200.ppm
The map is from Lisboa (Lisbon), Portugal, Europe with accurate information taken from local Heightmaps and Nasa data.
I don't mind doing other maps if I have the appropriate documents (preferably with scale) an time
Note: This map has most of the "Grande Área Metropolitana de Lisboa" (Lisbon Great Metropolitan Area), but to keep the accurate information of height I just put the city and the nearest area of Lisbon. It includes all "Margem Sul" (South Margin) from Almada/Costa da Caparica to Montijo/Alcochete. It goes to Loures and Sintra.