Question about the colors

[georgbachmann]

I found this repo cause I am currently also trying to create RGB dem tiles and they also have some strange spikes in them.
I followed an other tutorial first where i created the RGB dem using rio rgbify but here I've seen that you simply use gdal and the color-mapping.

I wonder how that works though?!?

3590 68 1 84
8890 253 231 37

where as the formula should be

height = -10000 + ((R * 256 * 256 + G * 256 + B) * 0.1)

but if I enter your values, this does not add up? So I am wondering how your color-mapping works?
Would be awesome if you could explain that.

[jebowe3]

You just need to determine a range of elevations that encompasses your DEM data. In this case, all of the raster values fall between 3590 meters and 8890 meters. The color range is expressed as RGB values from rgb (68, 1, 84) at 3590 meters to rgb (253, 231, 37) at 8890 meters. Each included meter is assigned a color within this RGB range. This is simply a two-entry version of the techniques for hypsometric tinting presented on websites like Bjørn Sandvik's "Creating color relief and slope shading with gdaldem" and Robert Simmon's "A Gentle Introduction to GDAL Part 5: Shaded Relief."