I'm really glad someone is producing a service like this and will start using it as soon as coverage is at least national! I wrote a webapp hillmap.com that do

I'm really glad someone is producing a service like this and will start using it as soon as coverage is at least national! I wrote a webapp hillmap.com that does client side slope shading for travel in avalanche terrain a few years ago using a usgs webservice that has since broken. I've looked into building a replacement but it is amazing how hard it is to find consistent elevation data across the globe.