How do I obtain a Fallout New Vegas Height Map

Ok so i’m going through the process of trying to remake FNV in Unreal Engine 4. The problem i’m facing however is that I can’t find any topographical or heightmaps of New Vegas. I tried looking through the GECK but apparently it’s still broken. I found a height map from a modder: Wasteland Heightmap at Fallout New Vegas - mods and community? but it looks to me to be inaccurate. Here’s some pictures of it in UE4:
http://i.imgur.com/RwC9c8H.jpg || http://i.imgur.com/erFks9P.jpg || http://i.imgur.com/uwoafiC.jpg || http://i.imgur.com/PksDJVy.jpg
and here’s a comparison of the game map and this height map: http://i.imgur.com/qYkHvoP.gif
I’m really lost and i’m just trying to get one simple map. Does anyone know how I can obtain one?

Dig around in the game’s files and in the creation kit?
Dunno, not an expert

height maps can be found in NASA official website

http://gdex.cr.usgs.gov/gdex/

Besides getting a heightmap, you will also need to ensure that horizontal and vertical scale are matching.