Категория:Эмпирические данные про рельеф Земли
Geoid and Mean sea level differences[править]
In aviation, the ellipsoid known as World Geodetic System 84 is increasingly used to define heights; however, differences up to 100 metres (328 feet) exist between this ellipsoid height and mean tidal height. The alternative is to use a geoid-based vertical datum such as NAVD88... The location-dependent, but persistent in time, separation between mean sea level and the geoid is referred to as (stationary) ocean surface topography. It varies globally in a range of ± 2 m.
Data[править]
free terrain data for anywhere in the world
aw:Aster instrument of the Terra satellite is also freely available for 99% of the globe, and represents elevation at 30 meter resolution... When land topography and bathymetry is combined, a truly Global Relief Model is obtained... ALOS provides since 2016 a global 1-arc second DSM free of charge... OpenTopography is a community access resource of high-resolution
aw:Category:Elevation api[править]
rivers[править]
реки в русской википедии имеют данные про водоток (исток, устье); расположение (притоки, населенные пункты)
- Wikidata has 'river mouth', 'river source' coordinates
- mw:Extension:Maps gives middle coordinates by geocoding
- World Rivers visualization on basis of aw:Natural Earth
- Sources... Rivers : Demis
- we first download the simplified shapefile of rivers polygons from the OpenStreetMapData page - poor data but good idea
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