I just got Transdem everyone so the route will be continued once I know how to use this program. Just to get a start in the right direction, can someone please tell me how I can get a DEM that will cover NYC. Right now I would mainly like Brooklyn, Queens, Manhattan, and the Bronx. I would like a DEM for NYC first before any other area because that is where the Metro North, LIRR, and NJT originate. Later on, after I have NYC I would like to get DEM's for upstate New York and Connecticut, and after that, maybe certain parts of NJ. To be honest, I am clueless about all of this. I am not sure what all the different meanings and terms such as vector data, tigers, hog, etc... All I know is that this program will give me the topogaphy or digital elevations for the area that I want. What are the different colored lines in the DEM for. If anyone can help me, that would be great. Later on when I get the chance, I'll take a look at the Transdem forum for support also. I am so happy I finally got this program. Now I just need to learn how to use it. One thing I would definitely like to know is, how can I get a detailed google earth image in my DEM. On one of the thread around the forum, I saw someone had a detailed google earth image put on the DEM, similar to the baseboards.