I used to frequent this website that was basically a google maps type of system but it showed elevation using a color gradient. And it would scale to wherever you zoomed in. I loved it mostly because it showed the unique patterns found with mountains, hills, river basins, etc.. I can no longer find the site but it had "topological" and "maps" in the address. There was an "en." at the start of it because I looked at it in English. Does anyone know the site?