Wikipedia:Graphics Lab/Resources/GIS sources and palettes: Difference between revisions
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SRTM: projection cylindrique équidistante (Lat/Lon) et le [[système géodésique]] [[WGS 84|WGS84]] : Source ???
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NASA [[Shuttle Radar Topography Mission]] (SRTM) Digital Elevation Model. Including SRTM1 (1 arch-sec = 31m), SRTM3 (3 arch-sec = 93m), SRTM30 (30 arch-sec = 930m). [http://dds.cr.usgs.gov/srtm/version2_1/Documentation/SRTM_Topo.pdf Documentation]
introduction]. WGS84/EGM96 geoid?
* {{Cite GIS |name= SRTM3 v2 |url_download= http://dds.cr.usgs.gov/srtm/version2_1/SRTM3 |publisher= NASA |year= 2000 |license= Public Domain |url_doc= http://dds.cr.usgs.gov/srtm/version2_1/Documentation/SRTM_Topo.pdf |layers= topography |precision_max= 93m (3"arch) |covered_area= 60⁰N-56⁰S (landmass only) |datum= WGS 84 |extensions= .zip → .hgt |size_compressed= ~2Mo each |size_uncompressed= ~4Mo each |tile_size= 1⁰ x 1⁰arch |tiles_total= ~20.000 |comment = perfect for small areas anywhere in the world. }}
* {{Cite GIS |name=SRTM1 v.2.1|url_download= http://dds.cr.usgs.gov/srtm/version2_1/SRTM1 |url_intro= |publisher=NASA |year=2000 |license=Public Domain |url_doc= http://dds.cr.usgs.gov/srtm/version2_1/Documentation/SRTM_Topo.pdf |url_doc= http://dds.cr.usgs.gov/srtm/version2_1/Documentation/SRTM_Topo.pdf
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[http://www.ngdc.noaa.gov/mgg/global/global.html ETOPO1] ([[topography]]/[[bathymetry]])
* one file for all the Earth (landmass and water)
* low quality (1px = 1000x1000m); unzipped file is ~400MB–1.1GB, depending on the format
* convenient for large maps depicting areas greater than 1000km (~620mi) across
(not working) [http://www.ngdc.noaa.gov/mgg/topo/gltiles.html GLOBE] (topography)
*16 files/tiles to cover the all the Earth (landmass)
*medium quality; unzipped landmass file is ~1.8GB
[http://srtm.csi.cgiar.org/SELECTION/inputCoord.asp SRTM3 v4] (topography)
*about 1,000 files/tiles to cover all the Earth (landmass)
*high quality (1px = 90x90m); unzipped landmass file is 30GB+
*slow to manage
*for confirmed map makers
*U.S. Geological Survey (USGS) [http://eros.usgs.gov/#/Find_Data/Products_and_Data_Available/gtopo30_info GTOPO30]
::Carte topographique mondiale réalisée en 1996 à partir de huit sources différentes. Alternative aux SRTM30 pour les régions non couvertes par ces fichiers. Carte découpée en 33 zones géographiques / fichiers compressés. Projection Lat/Lon ; système géodésique WGS84. Résolution de 30 sec. d'arc. Résolution par pixel : à l'équateur 928 m (Est-Ouest) – 921 m (Nord-Sud) ; à 82° de latitude 130 m (E-O) – 931 m (N-S). Précision verticale : très variable en fonction de la source utilisée, 9 m RMSE (Nouvelle-Zélande, 0,2% des donnés, précision la meilleure) ; 18 m RMSE (50% des données) ; 304 m RMSE (Pérou, 0,1% des données, précision la plus mauvaise).
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