Thanks, guys! I'm just looking for a way to reduce the length of a request, because I'm requesting a lot of layers at once. Layer group is not an option, because the list of the layers is being formed programatically.
WFS GetFeature is cool, but I guess it requires proxy - I have to investigate that. So the smaller the BBOX and HEIGHT/WIDTH, the faster a client gets a response, right? 2011/11/11 Ian Turton <ijtur...@gmail.com>: > On 11 November 2011 09:07, Rahkonen Jukka <jukka.rahko...@mmmtike.fi> wrote: >> Hi, >> >> That all comes from WMS standard and it is rather well written there >> http://portal.opengeospatial.org/files/?artifact_id=1081&version=1&format=pdf >> >> Logic goes somehow in opposite direction than what you planning to do. It >> assumes that user has made a GetMap request and sees a map on a screen. It >> is just an image and does not include any information about georeferencing. >> If use is clicking on a map the client software can only record which pixel >> was clicked. However, the georeferencing can be computed on the WMS server >> side if the WMS GetMap request with BBOX and image size is known. >> >> LAYERS just need to be in the request because standard says so but >> QUERY_LAYERS is the one used for selecting layers to be queried. They do not >> need to be the same. > > LAYERS is there because in theory you can just change the request from > getmap to getfeatureinfo and concatenate the click location and query > layer and send it back. This meant that back in the early days before > JavaScript became popular you could create a WMS client with some cgi > shell scripts and a submit button in ah HTML form. > >> >> For creating GetFeatureInfo requests from a scratch you will need to do some >> calculation. The the centre point, decide some image size in WIDTH and >> HEIGHT and compute BBOX according to those. > > If you find that you are having to do that sort of calculation then > you should probably be using a WFS getFeature request instead of a WMS > getFeatureInfo. > > Ian > ------------------------------------------------------------------------------ RSA(R) Conference 2012 Save $700 by Nov 18 Register now http://p.sf.net/sfu/rsa-sfdev2dev1 _______________________________________________ Geoserver-users mailing list Geoserver-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/geoserver-users
