A comprehensive list of webmapping toolkits. From OSGeo Wiki The goal of this list is to provide basic information about each webmapping toolkit, including: description: from toolkit website Licensesupported Map engines and/or protocolsDeveloper language(s): which programming language(s) webmapping developers might worry?
CartoWeb CartoWeb is a comprehensive and ready-to-use Web-GIS (Geographical Information System) as well as a convenient framework for building advanced and customized applications. L: GPLM: MapServer D: PHP Chameleon Chameleon is a distributed, highly configurable, environment for developing Web Mapping applications. L: Open SourceM: MapServer, WMSD: PHP collective.geo (Plone Maps) The goal is to provide a comprehensive set of tools to manage and publish geospatial data into Plone CMS, using existing and proven technologies as much as possible.
L: GPLM: (see OpenLayers, Polymaps) D: Python, JavaScript dbox dbox is really a collection of DHTML-based libraries for building highly interactive web-based mapping applications. Javascript. RGR92 / UTM zone 40S: EPSG Projection -- Spatial Reference. Help/Concepts/Coordinates – JOSM. This page is partly incomplete and outdated. See EPSG:4326 and the proj4 plugin exists ! Openstreetmap coordinates ¶ Openstreetmap uses Latitude/Longitude coordinates in the WGS84 geodetic datum (being compatible with GPS) for its nodes, stored in decimal degree notation with 7 decimal places in the .osm XML files. The same spot on earth would have slightly different Latitude/Longitude values in other coordinate systems, depending on the respective reference ellipsoid and reference points being used. Editor coordinates ¶ Java ¶ To render nodes and ways on the rectangular, flat computer screen, the location of the nodes needs to be reversibly mapped into a cartesian coordinate system, i.e. having perpendicular axes.
When displaying an area from this virtual canvas to the limited device space, the screen window in this case, Java internally converts these (x,y) coordinates to screen coordinates, automatically during rendering. LatLon ¶ EastNorth ¶ Projection ¶ Mercator ¶ [proj4j] problème de compréhension projection 900913. Bonjour, j'ai un petit problème de compréhension avec la projection EPSG 900913 (google mercator) avec la bibliothèque proj4j. Les coordonnées de google map sont en degrés décimaux.
Or lorsqu'on utilise la bibliothèque Proj4 ou proj4j la définition est: Code: Proj4js.defs["EPSG:900913"]= "+title= Google Mercator EPSG:900913 +proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +no_defs"; Si je lis bien l'unité de mesure est le mètre. Cela ne crée aucun problème avec gvsig, grass, geoserver ou openlayers mais oui avec proj4j. Je comptais utiliser proj4j pour reprojeter des points, originellement en EPSG31370 (Belgique) Proj4js.defs["EPSG:31370"] = "+title=Lambert belge +proj=lcc +lat_1=51.16666723333334 +lat_2=49.83333389999999 +lat_0=90 +lon_0=4.367486666666666 +x_0=150000.013 +y_0=5400088.438 +ellps=intl +towgs84=-99.1,53.3,-112.5,0.419,-0.83,1.885,-1.0 +units=m +no_defs"; Alors, il y a quelque chose qui m'échappe Réponse postérieure.
Tiles à la Google Maps: Coordinates, Tile Bounds and Projection - conversion to EPSG:900913 (EPSG:3785) and EPSG:4326 (WGS84) Click on a tile to display the numerical boundaries... Addressing tiles: same tile bounds with different indexes Google Maps, Microsoft Virtual Earth, Yahoo Maps, and other commercial API providers as well as OpenStreetMap and OpenAerialMap are using the same projection and tiling profile and tiles are therefore compatible.
The extents of all tiles as well as the zoom levels (resolution in meters per pixel) are predefined for the whole Earth. Difference is only in the way how the equivalent tiles are indexed. There are three main systems of tile adressing: Google XYZ, Microsoft QuadTree and from the open-source world comming TMS (Tile Map Service). MapTiler/GDAL2Tiles (the tile generator application) is following the TMS specification, because there is not any standard for tiling yet, OGC (Open Geospatial Consorcium) is working on the WMTS (Web Map Tiling Service) which is inspired by TMS. Spherical Mercator EPSG:900913 (EPSG:3857) and WGS84 Datum Links ... GeOrchestra.