1. You can use MINSCALEDENOM and MAXSCALEDENOM at either the layer or class level (on a current version of MapServer). So, it looks like they are in an appropriate place. The real test is to use MapServer to draw the layer for you. Does it turn on and off at the scales that you want it to?
2. Yes, it can apply to both the layer or class properties. I assume that you looked here: http://www.mapserver.org/mapfile/class.html#class 3. MapServer has nothing to do with when things load. This all happens on your client. It sounds like you modified your client to request each layer individually. If you just want to sandwich them all together, why not just make one WMS call to the server and request all of the layers in one image/call. This question is really more appropriate for the OpenLayers list. 4. I would consult the TileCache or OpenLayers list for this one. David. -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of sunny74 Sent: Saturday, August 29, 2009 2:01 AM To: [email protected] Subject: RE: [mapserver-users] turning on layers at a particular zoom level Hi David, Thanks for your reply. I wanted to have 3 layers displayed b/w scale of 1.2M and 1.15M and so I have added set MAXSCALEDENOM /MINSCALEDENOM as follows: LAYER NAME 'WaterBody' TYPE POLYGON DATA 'C:\ms4w\Apache\cgi-bin\Shape\WaterBody.shp' METADATA 'wms_title' 'WaterBody' END STATUS OFF TRANSPARENCY 100 PROJECTION 'proj=longlat' 'ellps=WGS84' 'datum=WGS84' 'no_defs' '' END CLASS NAME 'WaterBody' MAXSCALEDENOM 2000000 MINSCALEDENOM 1500000 STYLE SYMBOL 0 SIZE 2 OUTLINECOLOR 0 0 0 COLOR 150 123 90 END END END 1)Pls tell me whether I hav added the things at the correct place. 2) Can I also add it within the layer properties? 3) I find that the layers are being added at PageLoad.This I found out by looking at the number of items being added at the bottom left corner of IE. The number of items has nearly doubled due to the addition of the 3 layers. Is there any way by which I can stop the layers from being added at PageLoad i.e they should be added only when the desired scale is reached. 4) How to use TileCache or GeoWebCache i.e js code? Thanks again. Fawcett, David wrote: > > I assume the 'M' stands for million. > > If you want the layer to be only visible when 'zoomed in' beyond 1:2M, > I would set a MAXSCALEDENOM of 2000000. > > If you want the layer to be only visible when 'zoomed out' beyond > 1:2M, I would set a MINSCALEDENOM of 2000000. > > If you only want the layer to be visible between resolutions of > 1:100000 and 1:200000, you would set: both MINSCALEDENOM 100000 and > MAXSCALEDENOM 200000 > > These values go in either a LAYER or CLASS of LAYER in your MapServer map > file. > > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of sunny74 > Sent: Friday, August 28, 2009 8:45 AM > To: [email protected] > Subject: Re: [mapserver-users] turning on layers at a particular zoom > level > > > > Hi, > > Thanks for your reply. > I went thru the link and read about MAXSCALEDENOM/MINSCALEDENOM. So > MINSCALEDENOM is the minimum scale level at which a layer will become > visible. But I am a bit confused.When the map loads for the first time > it has a zoom level of 7 as given in the code below. > > map.setCenter(new OpenLayers.LonLat(74.25, 20.35), 7); > > In terms of scale it is showing 1:3M. > What is M? > If I increase the zoom level i.e do zoom in, scale becomes 1:856K and > 1:256K etc i.e scale decreases. So If want a layer to be visible at a > scale level of 1:2M what do I write in the mapfile? > > How to use TileCache or GeoWebCache?Pls give the js code. > > > Rahkonen Jukka wrote: >> >> Hi, >> >> Mapserver is somehow documented, about adjusting visibility according >> to scale, try to find MAXSCALEDENOM/MINSCALEDENOM from >> http://www.mapserver.org/mapfile/layer.html#index-21 >> >> Mapserver does not do caching but you can use for examply TileCache >> or >> GeoWebCache between your clients and Mapserver. >> >> -Jukka Rahkonen- >> >> >> >>> -----Alkuperäinen viesti----- >>> Lähettäjä: [email protected] >>> [mailto:[email protected]] Puolesta sunny74 >>> Lähetetty: 28. elokuuta 2009 14:53 >>> Vastaanottaja: [email protected] >>> Aihe: [mapserver-users] turning on layers at a particular zoom level >>> >>> >>> DEar Friends, >>> >>> I have 12 layers in my map and it is taking tooooo long to >>> load.Therefore I decided to turn on only 2 layers at Page Load. >>> >>> Rest of the layers I want to turn on at a particular zoom level.How >>> can I check the zoom level and turn on these layers. >>> >>> How can make the map load faster especially on page reload? Is it >>> possible to cache the map or is there some other technique? >>> >>> Thanks for ur reply. >>> >>> -- >>> View this message in context: >>> http://n2.nabble.com/turning-on-layers-at-a-particular-zoom-le >>> vel-tp3534156p3534156.html >>> Sent from the Mapserver - User mailing list archive at Nabble.com. >>> _______________________________________________ >>> 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 >> >> > > -- > View this message in context: > http://n2.nabble.com/turning-on-layers-at-a-particular-zoom-level-tp3534156p3534743.html > Sent from the Mapserver - User mailing list archive at Nabble.com. > _______________________________________________ > 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 > > -- View this message in context: http://n2.nabble.com/turning-on-layers-at-a-particular-zoom-level-tp3534156p3540787.html Sent from the Mapserver - User mailing list archive at Nabble.com. _______________________________________________ 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
