Wikipedia:Graphics Lab/Resources/QGIS/Get ready: Difference between revisions

Revision as of 01:07, 11 June 2011

Revision as of 01:55, 11 June 2011

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===Topography/bathymetry===

{{see also|:fr:Aide:Cartographie/Ressources cartographiques géoréférencées#Sources des données|:de:Hilfe:GMT#Topographische_Datens.C3.A4tze}}

* ETOPO1 ([[:en:topography|topography]]/[[:en:bathymetry|bathymetry]]): One file for all the Earth (landmass and waters). Low quality (1px = 1000x1000m ; all earth unzipped: 1.1Go), but convenient for large maps.<br />http://www.ngdc.noaa.gov/mgg/global/global.html

* (not working) GLOBE ([[:en:topography|topography]]): 16 files/tiles to cover the all the Earth (landmass). Medium quality (landmass unzipped = 1.8Go).<br />http://www.ngdc.noaa.gov/mgg/topo/gltiles.html

* SRTM/SWBD ([[:en:topography|topography]]): About 20.000 files/tiles to cover the all Earth (landmass). High quality (1px = 90x90m ; all landmass unzipped = + 60Go !), slow to manage, for confirmed map makers.<br />http://www2.jpl.nasa.gov/srtm/

* SRTM3 v2

* SRTM3 v4 ([[:en:topography|topography]]): About 1.000 files/tiles to cover the all Earth (landmass). High quality (1px = 90x90m ; all landmass unzipped = + 30Go !), slow to manage, for confirmed map makers.<br />http://srtm.csi.cgiar.org/SELECTION/inputCoord.asp

[[file:QGis_ETOPO1_vs_SRTM3_-_quality_match.jpeg|thumb|800px|center700px|Quality comparison between ETOPO1 vs(pixelated) and SRTM3 (bettersmoother) data sets. This difference doesn't matter whenfor you makemaking large maps >with coverage greater than 1000km (~620mi) across.]]

[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://www2.jpl.nasa.gov/srtm/ SRTM/SWBD] (topography)

*about 20,000 files/tiles to cover all the Earth (landmass)

*high quality (1px = 90x90m); unzipped landmass file is 60GB+

*slow to manage

*for confirmed mapmakers

[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

===Other GIS data===