Hi, WMS 1.3.0 standard does not say that maps must not be North-up any more. You may see rotated maps if you open gml vector data returned by WFS 1.1.0 service with a client than can't handle axis flipping but that is a client error, the map should be North up also in that case. By looking at the map image you cannot say which axis is x and which y because 'x' and 'y' are just axis names and it is another story which one means East-West and which one North-South. Look at your BBOX=-90,-180,90,180 and the image and you'll see that the second pair -180,180 is drawn in East-West axis.
-Jukka Rahkonen- -----Alkuperäinen viesti----- Lähettäjä: [email protected] puolesta: Olivier Terral Lähetetty: pe 19.11.2010 18:51 Vastaanottaja: [email protected] Aihe: [mapserver-users] EPSG:4326 with WMS 1.3.0 Hello, I've a doubt about how MapServer handles the EPSG:4326 CRS in WMS 1.3.0. With the CRS EPSG:4326, longitude/latitude are reverted so the map should be rotated by 90° on the right, with latitude on X axis and longitude on y axis . But on the example below the map has longitude on X axis and latitude on Y axis : http://demo.mapserver.org/cgi-bin/wms?SERVICE=WMS&VERSION=1.3.0&REQUEST=GetMap&BBOX=-90,-180,90,180&CRS=EPSG:4326&WIDTH=953&HEIGHT=480&LAYERS=bluemarble,cities&STYLES=,&FORMAT=image/png&DPI=96&TRANSPARENT=true See extract of the WMS 1.3.0 spec below: ################################################################################ 6.7.3.1 Introduction .... The Layer CRS has two axes, denoted x and y. The x axis is the first axis in the CRS definition, the y axis is the second axis. Depending on the particular CRS, the x axis may or may not be oriented West-to-East, and the y axis may or may not be oriented South-to-North. The WMS portrayal operation shall account for axis order, origin and direction in the Layer CRS when projecting geographic information from a Layer CRS to the Map CS. Coordinates shall be listed in the order defined by the CRS and shall be mapped appropriately to the Map CS i and j axes, swapping axis order as needed during the projection operation. Many projected coordinate reference systems have an axis and coordinate order other than easting, northing. For example, the Uniform Coordinate System used in Finland (EPSG:2393) orders northing before easting. EPSG geographic coordinate reference systems follow ISO 6709 and always list latitude before longitude. .... EXAMPLE: EPSG:4326 refers to WGS 84 geographic latitude, then longitude. That is, in this CRS the X axis corresponds to latitude, and the Y axis to longitude. ################################################################################ So, what is the right image to obtain, rotated or not? Thanks in advance. Bye Olivier Terral _______________________________________________ mapserver-users mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/mapserver-users _______________________________________________ mapserver-users mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/mapserver-users
