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What does spherical Mercator mean in OpenLayers community?
Spherical Mercator is a de facto term used inside the OpenLayers community – and also the other existing Open Source GIS community – to describe the projection used by Google Maps, Microsoft Virtual Earth, Yahoo Maps, and other commercial API providers.
Which is the default projection for OpenLayers maps?
Back to the original question: OpenLayers is capable of dealing with most projections. If you do not explicitly set one, your map is going to use our default which is the Web Mercator projection (EPSG:3857).
How can I use spherical Mercator in Google Maps?
Simply add your GeoServer layer as a WMS and add it to the map. Another common use case for spherical mercator maps is to load custom tiles. Many custom tile sets are created using the same projection as Google Maps, usually with the same z/x/y scheme for accessing tiles.
Do you need GeoServer to use spherical Mercator?
Current versions of GeoServer have support for EPSG:900913 built in, so there is no need to add additional projection data. Simply add your GeoServer layer as a WMS and add it to the map. Another common use case for spherical mercator maps is to load custom tiles.
Why does Mercator projection treat the Earth as a sphere?
This term is used to refer to the fact that these providers use a Mercator projection which treats the earth as a sphere, rather than a projection which treats the earth as an ellipsoid. This affects calculations done based on treating the map as a flat plane, and is therefore important to be aware of when working with these map providers.
What is the maxresolution of a spherical Mercator?
This map has a set of assumptions about the maxResolution of the map. Specifically, most spherical mercator maps use an extent of the world from -180 to 180 longitude, and from -85.0511 to 85.0511 latitude.
Which is an example of a spherical Mercator projection?
One prime example is OpenStreetMap, whose raster map tiles are all projected into the ‘spherical mercator’ projection. Projections in GIS are commonly referred to by their “EPSG” codes, identifiers managed by the European Petroleum Survey Group. One common identifier is “EPSG:4326”,…