Generate no-fire polygons

[kylebarron]

I.e. use a DEM and find all the areas above 10,000 feet in Yosemite, or whatever elevation it is. Do that for each area

[kylebarron]

The easiest way to do this is probably to take the USGS Contours dataset, take the intersection of it and the polygons of interest above x feet.

The issue is that the contours are lines, not polygons. So you'd presumably have to polygonize the lines. But which way do the lines point? Is it standardized in the data?

[kylebarron]

Note that gdal contour has a polygon option
https://gdal.org/programs/gdal_contour.html