Originally Posted By: K447
I don't know if there is a sufficiently accurate ground profile database for your area, nor have I any idea how one would get access to one if it exists.
Generally the federal government has this data on record somewhere, because it's useful for all kinds of things. For example, the data for Mexico will be here, somewhere (but since I don't read Spanish, I couldn't tell you where). And if they don't, you can often find pointers to it from universities or other sites dedicated to GIS.