I understand that it's not feasible to have caltopo automatically convert point cloud data to elevation rasters, but is it possible to upload custom raster data into caltopo? (For instance, if I were to convert it myself, would caltopo be able to use that data?)
I'm specifically interested in being able to create maps with higher-resolution hill shading based on LIDAR. I use caltopo for rock climbing, and having more granularity in the hill-shading can be tremendously useful. (With LIDAR, the exact shape of a cliff, large individual boulders, etc. become visible.)
Right now, I'm just using the geospatial image feature to do this. I copy a high-rez hill-shaded image from open-source LIDAR data, and load it into caltopo as a geospatial image. It's finicky to get the terrain lined up, but I can then use this layer at partial transparency to lend additional detail to the map.
Basically, I'm looking for a better way to do this (Without having to manually align the image to the map.) Is this currently possible, or is there any future development that might support this?
matt on 06 Feb, 2019 06:29 AM
You can't import your own LIDAR data, at the moment what you're doing is pretty much the best way. The only improvement would be to tile the hillshade using something like gdal2tiles, host it online on something like Amazon S3, and then add it as a custom source. That way the image size isn't limited and you don't have to manually align it by hand.
I don't see custom elevation sources being supported. The existing data is in a somewhat custom format that would be hard to replicate (standard PNG tiles, but using RGBA bands to store elevation plus precomputed slope and aspecft), and there's some interplay between front end and back end that would add to the complication of using other formats.