Re: [mapserver-users] Doubt about MapServer projections and WMS
Hello Jorge, Your interpretation of the documentation seems correct. Regarding the need for a PROJECTION object at the MAP level: Without it, Mapserver will generate an error message. I agree with you that for a WMS service it seems illogical to have to provide a PROJECTION element at the MAP level if there are projections defined in the MAP METADATA section. Perhaps one of the developers can explain. Håvard Tveite On 11/10/2011 7:49 PM, Jorge Arévalo wrote: Hello, From http://mapserver.org/mapfile/projection.html I get this: (...) To set up projections you must define one projection object for the output image (in the MAP object) and one projection object for each layer (in the LAYER objects) to be projected. (..) Think of the MAP-level projection object as your output projection. The EXTENT and UNITS values at the MAP-level must be in the output projection units. Also, if you have layers in other projections (other than the MAP-level projection) then you must define PROJECTION objects for those layers, to tell MapServer what projections they are in. Ok, pretty clear so far. Mapserver will render one or more data layers. Each data layer will have its own projection, and this is specified in the PROJECTION property of the layer object. The layers will be render to a image map with another projection. This projection is specified in the PROJECTION property of the MAP object, at highest level. This is the output projection. Now, I want to serve my maps under WMS protocol. http://mapserver.org/ogc/wms_server.html#setup-a-mapfile-for-your-wms So, I need to define a MAP PROJECTION. And that projection will be used to generate a BoundingBox tag for the GetCapabilities XML response. But, my first question: Is this the projection in which the data will be rendered? What about if I want to serve my data in different projections? Do I need to specify several PROJECTION objects at MAP level? I guess not, because I read: (...) it is often impossible to find an EPSG code to match the projection of your data. In those cases, the “wms_srs” metadata is used to list one or more EPSG codes that the data can be served in, and the PROJECTION object contains the real PROJ4 definition of the data’s projection So, if I understood, I specify the output projections I offer for my data in wms_srs at WEB object level. But then, why do I need a PROJECTION object at MAP level? I specified the projection of all my input data in each LAYER object. Or other way: - My input data projection is defined at LAYER level - The output projections offered are specified in wms_srs at WEB level Then,,, why do I need PROJECTION object at MAP level when I want to configure my WMS server? Sorry for the basic questions, and many thanks in advance Best regards, -- Håvard Tveite Department of Mathematical Sciences and Technology, UMB Drøbakveien 31, POBox 5003, N-1432 Ås, NORWAY Phone: +47 64965483 Fax: +47 64965401 http://www.umb.no/imt/ ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
Re: [mapserver-users] doubt about mapserver URL: coordinate system
you are right. Thanks On Wed, Oct 6, 2010 at 6:15 PM, Rahkonen Jukka jukka.rahko...@mmmtike.fiwrote: Hi, It looks like your application is calling Mapserver with native CGI requests and I believe you have defined some special Mapserver layer in your application. Try to change it to standard WMS layer. -Jukka Rahkonen- Sebastian E. Ovide wrote: Lähetetty: ke 6.10.2010 18:06 Vastaanottaja: mapserver-users@lists.osgeo.org Aihe: [mapserver-users] doubt about mapserver URL: coordinate system Hi List I'm using OpenLayers + MapServer. With Firebug I see that OpenLayers calls MapServer with ULRs like this: http://mapserver/mapserver?layers=NAFRA_2008_final map=/home/gis/conf/mapserver/uk.map mode=map map_imagetype=png mapext=-374388.56527373+7296678.7179959+-374312.12824546+7296755.1550241 imgext=-374388.56527373+7296678.7179959+-374312.12824546+7296755.1550241 map_size=256+256 imgx=128 imgy=128 imgxy=256+256 Just trying to understand the coordinate system used by mapext and imgext. ( it is different from than that used to call Google servers: http://mt0.google.com/vt/lyr...@133hl=ensrc=apix=257246y=166679z=19s=G ) Is it possible to use a different coordinate system ? say for example the same coordinate system specified in the LAYER (in my case epsg:27700) thanks -- Sebastian E. Ovide -- Sebastian E. Ovide ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
Re: [mapserver-users] doubt about mapserver URL: coordinate system
Sebastian, You can use either mapserver or wms syntax with openlayers. The coordinates you see are in the Google Mercator or Spherical Mercator projection. The google coordinates are the tile references (z=19) and the x and y should match the center point of your mapext/imgext. To use mapserver with google mercator you¹d use the projection block at the mapfile level of PROJECTION proj=merc lon_0=0 k=1 x_0=0 y_0=0 a=6378137 b=6378137 towgs84=0,0,0,0,0,0,0 units=m no_defs END Mike -- Michael Smith US Army Corps of Engineers Remote Sensing/GIS Center Hanover, NH On 10/7/10 7:42 AM, Sebastian E. Ovide sebastian.ov...@gmail.com wrote: you are right. Thanks On Wed, Oct 6, 2010 at 6:15 PM, Rahkonen Jukka jukka.rahko...@mmmtike.fi wrote: Hi, It looks like your application is calling Mapserver with native CGI requests and I believe you have defined some special Mapserver layer in your application. Try to change it to standard WMS layer. -Jukka Rahkonen- Sebastian E. Ovide wrote: Lähetetty: ke 6.10.2010 18:06 Vastaanottaja: mapserver-users@lists.osgeo.org Aihe: [mapserver-users] doubt about mapserver URL: coordinate system Hi List I'm using OpenLayers + MapServer. With Firebug I see that OpenLayers calls MapServer with ULRs like this: http://mapserver/mapserver?layers=NAFRA_2008_final map=/home/gis/conf/mapserver/uk.map mode=map map_imagetype=png mapext=-374388.56527373+7296678.7179959+-374312.12824546+7296755.1550241 imgext=-374388.56527373+7296678.7179959+-374312.12824546+7296755.1550241 map_size=256+256 imgx=128 imgy=128 imgxy=256+256 Just trying to understand the coordinate system used by mapext and imgext. ( it is different from than that used to call Google servers: http://mt0.google.com/vt/lyr...@133hl=ensrc=apix=257246y=166679z=19s=G ) Is it possible to use a different coordinate system ? say for example the same coordinate system specified in the LAYER (in my case epsg:27700) thanks -- Sebastian E. Ovide ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
Re: [mapserver-users] doubt about mapserver URL: coordinate system
Hi, It looks like your application is calling Mapserver with native CGI requests and I believe you have defined some special Mapserver layer in your application. Try to change it to standard WMS layer. -Jukka Rahkonen- Sebastian E. Ovide wrote: Lähetetty: ke 6.10.2010 18:06 Vastaanottaja: mapserver-users@lists.osgeo.org Aihe: [mapserver-users] doubt about mapserver URL: coordinate system Hi List I'm using OpenLayers + MapServer. With Firebug I see that OpenLayers calls MapServer with ULRs like this: http://mapserver/mapserver?layers=NAFRA_2008_final map=/home/gis/conf/mapserver/uk.map mode=map map_imagetype=png mapext=-374388.56527373+7296678.7179959+-374312.12824546+7296755.1550241 imgext=-374388.56527373+7296678.7179959+-374312.12824546+7296755.1550241 map_size=256+256 imgx=128 imgy=128 imgxy=256+256 Just trying to understand the coordinate system used by mapext and imgext. ( it is different from than that used to call Google servers: http://mt0.google.com/vt/lyr...@133hl=ensrc=apix=257246y=166679z=19s=G ) Is it possible to use a different coordinate system ? say for example the same coordinate system specified in the LAYER (in my case epsg:27700) thanks -- Sebastian E. Ovide ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
RE: [mapserver-users] Doubt
Ramya, Please check the FEATURE section within LAYER section. LAYER ... FEATURE POINTS x y END END ... END OR LAYER ... FEATURE WKT POINT(2000 2500)END ... END Greetings from México IC Carlos Ruiz --- On Tue, 8/12/08, Venkat Rao Tammineni [EMAIL PROTECTED] wrote: From: Venkat Rao Tammineni [EMAIL PROTECTED] Subject: RE: [mapserver-users] Doubt To: 'ramya srinivasan' [EMAIL PROTECTED], mapserver-users@lists.osgeo.org Date: Tuesday, August 12, 2008, 3:32 AM Hi, Please check this url. http://mapserver.gis.umn.edu/docs/reference/vector_data/VirtualSpatialData I hope it will help you… Thanks and Regards Venkat. From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of ramya srinivasan Sent: Tuesday, August 12, 2008 1:29 PM To: mapserver-users@lists.osgeo.org Subject: [mapserver-users] Doubt Hi, i will have to display point in a map given its co-ordinates.The co-ordinates has to be given manually.What do i have to do for that? ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
