I am trying to get data from a WMS server that gives me an example image request like so:
REQUEST=GetMap&CRS=EPSG:3857&LAYERS=2013-03-13T16:40:30Z&BBOX=-19000030.25383,-747262.291898,-2929909.4293921,10421104.783351
Their docs do not specify what these values specifically are but this appears to be minx,miny,maxx,maxy
http://docs.geoserver.org/stable/en/user/services/wms/reference.html
When I look at requests coming from Cesium I see what appear to be lat/lons. What replacement tokens do I use to get the values you see above?
From their docs:
Specify the parameters for defining the viewport: BBOX, WIDTH, and HEIGHT. These values are normally calculated for you automatically when using mapping framework such as Google Maps or OpenLayers
I see these in UrlTemplateImageryProvider in the docs but none of these appear to satisfy the requirement at first glance:
{z}: The level of the tile in the tiling scheme. Level zero is the root of the quadtree pyramid.
{x}: The tile X coordinate in the tiling scheme, where 0 is the Westernmost tile.
{y}: The tile Y coordinate in the tiling scheme, where 0 is the Northernmost tile.
{s}: One of the available subdomains, used to overcome browser limits on the number of simultaneous requests per host.
{reverseX}: The tile X coordinate in the tiling scheme, where 0 is the Easternmost tile.
{reverseY}: The tile Y coordinate in the tiling scheme, where 0 is the Southernmost tile.
{reverseZ}: The level of the tile in the tiling scheme, where level zero is the maximum level of the quadtree pyramid. In order to use reverseZ, maximumLevel must be defined.
{westDegrees}: The Western edge of the tile in geodetic degrees.
{southDegrees}: The Southern edge of the tile in geodetic degrees.
{eastDegrees}: The Eastern edge of the tile in geodetic degrees.
{northDegrees}: The Northern edge of the tile in geodetic degrees.
{westProjected}: The Western edge of the tile in projected coordinates of the tiling scheme.
{southProjected}: The Southern edge of the tile in projected coordinates of the tiling scheme.
{eastProjected}: The Eastern edge of the tile in projected coordinates of the tiling scheme.
{northProjected}: The Northern edge of the tile in projected coordinates of the tiling scheme.
{width}: The width of each tile in pixels.
{height}: The height of each tile in pixels.
It’s possible to use UrlTemplateImageryProvider (in which case westProjected et al are what you want for your bbox parameter), but it’s simpler to use WebMapServiceImageryProvider. The EPSG:3857 bit in your URL is the same as what Cesium calls the Web Mercator projection. So you just need to specify “tilingScheme: new Cesium.WebMercatorTilingScheme()” in the WebMapServiceImageryProvider constructor.