This repository contains some tools to convert raw data provided by OpenSnowMap to mbtiles file that can be used for example using MapLibre.

Source

Data provided by OpenSnowMap: https://www.opensnowmap.org/download/relief/

Tools

The following tools are used for the conversion:

• ogr2ogr
• tippecanoe
• tile-join

Using the provided Dockerfile you can build a container image with these tools.

Build image:

docker build -t opensnowmap-utils .

Run bash in image:

docker run --rm -ti -v /data:/data opensnowmap-utils

Contours

First you have to extract the file contours2.tar:

tar xvf contours2.tar

The contours MBTiles file is generated using the script generate_mbtiles.sh.

The input to this script are the extracted *.shp.gz files. Each file is unzipped and converted to geojson. Afterwards mbtiles files are generated for various zoom levels. Finally the mbtiles file are merged to a single file (per shape file).

After running this script you have many individual mbtiles files which have to be merged to a single mbtiles file using tile-join.

Hillshades

First you have to extract the file dem_tar.tar:

tar xvf dem_tar.tar

The hillshades are provided as geotiff files (out*.tif) and they must be converted to individual mbtiles files first and finally merged to a single mbtiles file:

for filename in ./out*.tif; do
    gdal_translate -of mbtiles "$filename" "./$(basename "$filename" .tif).mbtiles"
done
tile-join -o dem.mbtiles out*.mbtiles