Landscapes similar to open pits?

Hey all,

I’m trying to collect contour data to test DD’s exports but I’m running into a problem - I’m having a hard time getting authorization to fly regulated quarries/pits. Is there any alternative that could provide similar data?

I’m located in Southern California near the La Habra area, if that helps. I’m willing to drive, so if anyone knows any potential, preferably public sites that could be mapped, I’m all ears.