<!DOCTYPE html><html><body><div dir="auto">Hello,<br>I'm reworking the DEM at Opensnowmap.org taking advantage of modern lidar data while keeping a ~30m resolution. <br><br>I'm planning to experiment on optimizing the world-wide contour line DB. It's currently 504GB of dead data just for rendering, and quite expensive in term of storage. <br>The current Gist index takes 54GB on disk, so I guess I could save this with a Brin index instead. After all contours requests to the DB starts at zoom 11, so they are always big chunks in the order of 0.1x0.1° max.<br>Anyone has already experience in this? <br><br><br>The other drastic measure I envision is to limit the data to places with ski pistes, but that limit the usefulness of the data : my last extract from 2015 was shared widely to a number of projects. <br><br>Other optimisation suggestions welcome. <br><br>Regards, <br>Yves <br><br></div></body></html>