Категория:Эмпирические данные про рельеф Земли: различия между версиями
(→Earth2014) |
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[https://github.com/openterrain/openterrain/wiki/Terrain-Data free terrain data for anywhere in the world] | [https://github.com/openterrain/openterrain/wiki/Terrain-Data free terrain data for anywhere in the world] | ||
− | [https://en.wikipedia.org/wiki/Digital_elevation_model#Sources [[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] | + | [https://en.wikipedia.org/wiki/Digital_elevation_model#Sources [[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] |
http://www.opendem.info | http://www.opendem.info |
Версия 12:28, 17 апреля 2018
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
Elevation data[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 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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