Topographic (geodetic) shape is always changing with time. Radar inferometry from satellites gives the most repeated surveys, but has low spatial resolution. Yo

Topographic (geodetic) shape is always changing with time. Radar inferometry from satellites gives the most repeated surveys, but has low spatial resolution. You can discern made-made, seasonal, and geological factors causing change. The American Geophysical Union meeting each December has several hundred papers on dynamic geodesy.