Kick off the willpower to go to space and look back as a nation, or better yet an entire species, and then keep funding that drive for decades. Then, utilize the public data used to produce more precise elevation data useful for things like this: https://www.youtube.com/watch?v=MJgXaqW3md8

Note, you may end up with more elevation data then requested and may need to move your favorite hiking spots to within the path of an eclipse.