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tecnica:gps_cartografia_gis:openlayers_900913 [2010/11/05 14:19] – niccolotecnica:gps_cartografia_gis:openlayers_900913 [2010/11/05 14:21] – niccolo
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-====== OpenLayers with OpenStreetMap ======+====== OpenStreetMap con OpenLayers ======
  
 Le mappe di **[[http://www.openstreetmap.org|OpenStreetMap]]** (ma anche quelle di **[[http://maps.google.com/|Google Maps]]** e di **[[http://www.microsoft.com/VIRTUALEARTH/|Virtual Earth]]**) utilizzano una proiezione **[[http://crschmidt.net/~crschmidt/spherical_mercator.html|Spherical Mercator]]**. Tale proiezione ha codice **EPSG:900913**, che purtroppo non è compresa tra le proiezioni di PROJ. Le mappe di **[[http://www.openstreetmap.org|OpenStreetMap]]** (ma anche quelle di **[[http://maps.google.com/|Google Maps]]** e di **[[http://www.microsoft.com/VIRTUALEARTH/|Virtual Earth]]**) utilizzano una proiezione **[[http://crschmidt.net/~crschmidt/spherical_mercator.html|Spherical Mercator]]**. Tale proiezione ha codice **EPSG:900913**, che purtroppo non è compresa tra le proiezioni di PROJ.
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 This recipe can be improved by adding a ''bbox'' parameter (calculated at runtime) to the location of the layer, and forcing a call to ''updateFriends()'' whenever the viewport of the map changes. This recipe can be improved by adding a ''bbox'' parameter (calculated at runtime) to the location of the layer, and forcing a call to ''updateFriends()'' whenever the viewport of the map changes.
- 
-===== Using Blue Marble imagery with OpenLayers ===== 
- 
-==== Raster datasets from NASA ==== 
- 
-Several imagery sets exists from NASA, among them: 
- 
-  * **[[http://earthobservatory.nasa.gov/Features/BlueMarble/|Blue Marble next generation]]** (1 pixel = 500x500 m) 
-  * **[[http://onearth.jpl.nasa.gov/|Land Sat 7]]** (1 pixel = 15x15 m) 
- 
-The original Blue Marble images came from **[[http://modis.gsfc.nasa.gov/|MODIS]]**, the spectroradiometer aboard of **[[http://terra.nasa.gov/|Terra]]** and **[[http://aqua.nasa.gov/|Aqua]]** satellites. //Blue Marble Next Generation// added more spatial resolution. 
- 
-==== Blue Marble WMS Server ==== 
- 
-**[[http://onearth.jpl.nasa.gov/]]** 
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-OnEarth WMS server by NASA offers a standard WMS service plus a "Tiled WMS" (prerendered tiles). 
- 
-  * http://onearth.jpl.nasa.gov/wms.cgi?request=GetCapabilities 
-  * http://onearth.jpl.nasa.gov/wms.cgi?request=GetTileService 
- 
-==== World Wind ==== 
- 
-**[[http://worldwind.arc.nasa.gov/index.html|NASA World Wind]]** 
- 
-**World Wind** is a software (open source but MS-Windows only) developed by NASA which allows to pan and zoom into several raster datasets offered by NASA servers. World Wind uses (among others) Blue Marble imagery. 
- 
-The same imagery server can be used by other software, e.g. OpenLayers via the ''OpenLayers.Layer.WorldWind()'' function. 
- 
-==== Blue Marble WMS Tiled Server ==== 
- 
-  * **[[http://onearth.jpl.nasa.gov/tiled.html|Tiled WMS]]** 
- 
-This is an extension to the standard WMS protocol, the capabilities of such services are exposed at: 
- 
-  * [[http://onearth.jpl.nasa.gov/wms.cgi?request=GetTileService]] 
- 
-Some of the tags announced by the service are: 
- 
-^ OnlineResource     | Server prefix (%%http://...%%)   | 
-^ LatLonBoundingBox  | Covered area    | 
-^ width, height      | Tile size       | 
-^ format             | Tile format ()  | 
-^ bbox               | Tile coverage   | 
-^ Name               |                 | 
-^ Title              |                 | 
-^ Abstract           |                 | 
  
tecnica/gps_cartografia_gis/openlayers_900913.txt · Last modified: 2010/11/05 14:47 by niccolo