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If you're looking for something worldwide, your best starting point is likely SRTM[1].

If you get into more specific areas you can generally find higher resolution data.

Good luck.

Thanks for the rec

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

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.