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Konstantin Gründger 2019-03-17 15:00:43 +01:00
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@ -56,9 +56,12 @@ For best performance you should use [TimescaleDB](https://www.timescale.com), wh
psql -d ogn -c "DROP TABLE world_borders_temp;"
```
8. Optional: Import world elevation data (needed for AGL calculation)
8.1 Sources: There are many sources for DEM data. It is important that the spatial reference system (SRID) is the same as the database.
8. Import world elevation data (needed for AGL calculation)
8.1 Sources: There are many sources for DEM data. It is important that the spatial reference system (SRID) is the same as the database which is 4326.
8.1.1 The [GMTED2010 Viewer](https://topotools.cr.usgs.gov/gmted_viewer/viewer.htm) provides data for the world. Just download the data you need.
8.1.2 For Europe we can get the DEM as GeoTIFF files from the [European Environment Agency](https://land.copernicus.eu/imagery-in-situ/eu-dem/eu-dem-v1.1).
Because the SRID of these files is 3035 and we want 4326 we have to convert them: