[ryandrake]

Also consider ETOPO1 [1]. SRTM is kind of old and is treetop instead of groundlevel which may matter for your application.

1: https://www.ngdc.noaa.gov/mgg/global/

[ge96]

Yeah I'm specifically looking for slopes/cliffs so a generally flat area then a sharp rise.

Hopefully 100 ft is not too small vs. thousands of feet.

I'll check that link out, thanks.