AVIATIONTOOLBOX: How do you like your maps stitched?

"Matthew F. G." writes:

Would you happen to know just what terrain data set they use?

No, but I do see on the front of each sectional there's a note (right
under the map) that says "Topographic data corrected to XXXXX".

BTW, the FAA is offering a new set of high-resolution digital elevation
data for right around some airports. It's expensive and doesn't seem
to add a lot of value (for my purposes) for what's out there already so
I'm not planning to get it.

--kyler