srtm-gridded-vector
Makes vector tiles of gridded worldwide elevation data
Source data
SRTM30: 30-arc-second SRTM elevation data, with voids filled by USGS 30-arc-second topography
wget -m -np https://dds.cr.usgs.gov/srtm/version2_1/SRTM30/
Tile the world
$ make
$ for i in dds.cr.usgs.gov/srtm/version2_1/SRTM30/[ew]*[ns]*; do ./dem2json <(unzip -p $i/$(basename $i).hdr.zip) <(unzip -p $i/$(basename $i).dem.zip); done | time tippecanoe -P -r1 -z9 -f -o srtm.mbtiles
For layer 0, using name "srtm"
115198929 features, 2177428243 bytes of geometry, 4 bytes of separate metadata, 142873 bytes of string pool
99.9% 9/64/249
3907.19 real 9693.81 user 528.80 sys
What the GeoJSON looks like
It is represented as points with ~0.025 degree spacing at zoom level 9, with progressively larger spacing at lower zooms.
Each point looks like this:
{"type": "Feature", "properties":{"elevation":158}, "tippecanoe":{"minzoom":0, "maxzoom": 0}, "geometry": {"type": "Point", "coordinates" : [ 20.004167, 39.995833 ] } }
with a minzoom and maxzoom set so it only appears at one zoom level.
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