nst-guide / terrain Goto Github PK

https://github.com/tmnnrs/terrain-rgb

gdalbuildvrt -vrtnodata -9999 -input_file_list terrain50_filelist.txt terrain50.vrt
gdalwarp -r cubicspline -s_srs EPSG:4269 -t_srs EPSG:3857 -dstnodata 0 -co COMPRESS=DEFLATE USGS_NED_13_n34w117_IMG.img terrain_cubicspline.tif
rio rgbify -b -10000 -i 0.1 --max-z 9 --min-z 5 --format png terrain_cubicspline.tif terrain.mbtiles

Use gdaldem contour to create a 10m contour dataset, then export to GeoJSON seq, run through Tippecanoe with the same layer name as the USGS 40' contours (also make sure that the 50m lines have the right key so they can be made bold).

Then it should be possible to switch effortlessly between an imperial and metric basemap, where the imperial basemap isn't just 40' converted into meters.

Instead of using gdaldem color-relief to generate a raster with colors, you should investigate vectorizing the slope-angle (non-color-relief) raster. Then you only have to store the vector polygons of given slope angles.

So vectorize polygons while binning into whole-degrees? Or bin into Caltopo's color scheme bins?

Since we have to download DEM to generate slope, what if we need to generate a slope degrees layer of the entire U.S. with a 1-mater resolution?
the size of the needed DEM is very very huge. how do we download and store it to start working on it using GDAL?
I think the size of this DEM will be +700 TB !!!!

even non-sloped terrain is darkened with the current setup. It might be worth exploring phasing in the opacity, so that non-sloping areas aren't darkened.

download.py isn't working any more. I think it is because the nationalmap.gov guys have changed their website/download links.
https://viewer.nationalmap.gov/tnmaccess/api/products

I've created a very similar tutorial terrain-rgb but still have issues with no-data regions. We both set the value of rgb(0,0,0) to -10000 and I expected rio to omit all regions with this value. Unfortunately this does not work and my mbtiles container is full of tiles with an elevation of 0.

Do you see the same results and if not can you please give me a hint where to pay attention to?

Thank you for your help!
Best regards, Thomas