A mixin for layers that wraps up the pieces neccesary to have a coordinate conversion for working with commercial APIs which use a spherical mercator projection. Using this layer as a base layer, additional layers can be used as overlays if they are in the same projection.
A layer is given properties of this object by setting the sphericalMercator property to true.
+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
900913=PROJCS[“WGS84 / Simple Mercator”, GEOGCS[“WGS 84”, DATUM[“WGS_1984”, SPHEROID[“WGS_1984”, 6378137.0, 298.257223563]], PRIMEM[“Greenwich”, 0.0], UNIT[“degree”, 0.017453292519943295], AXIS[“Longitude”, EAST], AXIS[“Latitude”, NORTH]], PROJECTION[“Mercator_1SP_Google”], PARAMETER[“latitude_of_origin”, 0.0], PARAMETER[“central_meridian”, 0.0], PARAMETER[“scale_factor”, 1.0], PARAMETER[“false_easting”, 0.0], PARAMETER[“false_northing”, 0.0], UNIT[“m”, 1.0], AXIS[“x”, EAST], AXIS[“y”, NORTH], AUTHORITY[“EPSG”,”900913”]]
| OpenLayers. Layer. SphericalMercator | A mixin for layers that wraps up the pieces neccesary to have a coordinate conversion for working with commercial APIs which use a spherical mercator projection. |
| Functions | |
| forwardMercator | Given a lon,lat in EPSG:4326, return a point in Spherical Mercator. |
| inverseMercator | Given a x,y in Spherical Mercator, return a point in EPSG:4326. |
| Two transforms declared | Transforms from EPSG:4326 to EPSG:900913 and from EPSG:900913 to EPSG:4326 are set by this class. |
forwardMercator: function( lon, lat )
Given a lon,lat in EPSG:4326, return a point in Spherical Mercator.
| lon | {float} |
| lat | {float} |
{OpenLayers.LonLat} The coordinates transformed to Mercator.
inverseMercator: function( x, y )
Given a x,y in Spherical Mercator, return a point in EPSG:4326.
| x | {float} A map x in Spherical Mercator. |
| y | {float} A map y in Spherical Mercator. |
{OpenLayers.LonLat} The coordinates transformed to EPSG:4326.
Given a lon,lat in EPSG:4326, return a point in Spherical Mercator.
forwardMercator: function( lon, lat )
Given a x,y in Spherical Mercator, return a point in EPSG:4326.
inverseMercator: function( x, y )