Категория:Эмпирические данные про рельеф Земли: различия между версиями

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(не показано 26 промежуточных версий этого же участника)
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[[Category:Моделирование рельефа]]
 
[[Category:Моделирование рельефа]]
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= Geoid and Mean sea level differences =
 
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[[wikipedia:Geoid|The geoid is the shape that the surface of the oceans would take under the influence of Earth's gravity and rotation alone, in the absence of other influences such as winds and tides... the geoid's variation ranges from +85 m (Iceland) to −106 m (southern India), less than 200 m total compared to a perfect mathematical ellipsoid.]]
 
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[https://en.wikipedia.org/wiki/Sea_level In aviation, the ellipsoid known as [[wikipedia:World Geodetic System|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.]
 
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[https://en.wikipedia.org/wiki/File:Geoida.svg https://upload.wikimedia.org/wikipedia/commons/thumb/0/00/Geoida.svg/330px-Geoida.svg.png]
 
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= Data =
 
= Data =
 
[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]
  
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[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]
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[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
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== Earth2014 ==
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== [[aw:Category:Elevation api]] ==
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*freely available via http://ddfe.curtin.edu.au/models/Earth2014/
 
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**[http://ddfe.curtin.edu.au/models/Earth2014/data_5min/GMT/ folder GMT] has data in [[wikipedia:Generic Mapping Tools]] format
 
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The Earth2014 global topography and relief model [17] provides layered topography grids at 1 arc-minute resolution. Other than [[SRTM30 PLUS|SRTM30plus]], [[#Earth2014]] provides information on ice-sheet heights and bedrock (that is, topography below the ice) over Antarctica and Greenland
 
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[https://en.wikipedia.org/wiki/Global_Relief_Model#Earth2014_.282015.29 Earth2014 provides five different layers of height data, comprising Earth’s surface (lower interface of the atmosphere), topography and bathymetry of the oceans and major lakes, topography, bathymetry and bedrock, ice-sheet thicknesses and rock-equivalent topography. The Earth2014 global grids are provided as heights relative to the mean sea level]
 
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[http://ddfe.curtin.edu.au/models/Earth2014/Hirt_Rexer2015_Earth2014.pdf While the previously described relief models provide elevations of the topography or bedrock with respect to the mean sea level, shape models represent the geometry of the planet via the planetary radius (i.e., distances Rp between the geocenter and the surface points). As such, relief and shape models differ by the sum of (a) the ellipsoidal radius, and (b) the geoid height, with the latter being an approximation of the separation between the mean sea level and the ellipsoid surface. Following this definition, radii Rp of the Earth2014 shape models were constructed as sum of ellipsoidal radii Re, geoid undulations N and relief heights Hp... Rp = Re + N + Hp...  Geoid undulations N were obtained from the EGM96 geopotential model (Lemoine et al. 1998)... We note that the choice of the geoid model is not too much a concern for global relief modelling, given the differences between present geoid models are mostly at or less the 1m‐level... Earth2014 is formally independent from ETOPO1... Given that ETOPO1 is based on a 2008 measured/estimated 2 arc‐min bathymetry grid by Scripps Institution of Oceanography... RET represents ice and water masses as mass‐equivalent layers of rock, based on the mass compression procedure]
 
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[http://ddfe.curtin.edu.au/models/Earth2014/readme_earth2014.dat a constant value of 6,371,000 m has been subtracted from all shape models... land types as follows: 0 - land topography above mean sea level (MSL), 1 - land topography below MSL, 2 - ocean bathymetry, 3 - inland lake, bedrock above MSL, 4 - inland lake, bedrock below MSL, 5 - ice cover, bedrock above MSL, 6 - ice cover, bedrock below MSL, 7 - ice shelf, 8 - ice covered lake (Vostok).]
 
  
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== [[Elevation data]] ==
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== [[:Category:Водные пути]] ==
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== rivers ==
 
 
реки в русской википедии имеют данные про водоток (исток, устье); расположение (притоки, населенные пункты)
 
реки в русской википедии имеют данные про водоток (исток, устье); расположение (притоки, населенные пункты)
 
* Wikidata has 'river mouth', 'river source' coordinates
 
* Wikidata has 'river mouth', 'river source' coordinates
 
* [[mw:Extension:Maps]] gives middle coordinates by geocoding
 
* [[mw:Extension:Maps]] gives middle coordinates by geocoding
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* [http://pinedesk.a.willowdesk.info/project/rivers/  World Rivers visualization] on basis of [[Natural Earth]]
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* [http://pinedesk.a.willowdesk.info/project/rivers/  World Rivers visualization] on basis of [[aw:Natural Earth]]
 
** [http://www.naturalearthdata.com/http//www.naturalearthdata.com/download/10m/physical/ne_10m_lakes.zip lakes with rivers good]
 
** [http://www.naturalearthdata.com/http//www.naturalearthdata.com/download/10m/physical/ne_10m_lakes.zip lakes with rivers good]
 
* [https://commons.wikimedia.org/wiki/File:Cilician_Armenia-fr.svg  Sources... Rivers : Demis]
 
* [https://commons.wikimedia.org/wiki/File:Cilician_Armenia-fr.svg  Sources... Rivers : Demis]
 
* [https://github.com/simonepri/geo-maps/blob/master/info/earth-rivers.md we first download the simplified shapefile of rivers polygons from the OpenStreetMapData page] - poor data but good idea
 
* [https://github.com/simonepri/geo-maps/blob/master/info/earth-rivers.md we first download the simplified shapefile of rivers polygons from the OpenStreetMapData page] - poor data but good idea

Текущая версия на 14:45, 24 февраля 2019

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

http://www.opendem.info

aw:Category:Elevation api[править]

Category:Водные пути[править]

реки в русской википедии имеют данные про водоток (исток, устье); расположение (притоки, населенные пункты)

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