[mapserver-users] Using mapserver with EPSG:900913
ritesh ambastha
ritesh.linux at gmail.com
Thu Aug 21 06:07:36 PDT 2008
I am not sure this will help or not....
I found two epsg files in my /usr/local/share/proj directory:
epsg
EPSG (in caps)
I modify the values in both the files for my use. You can also try the same
Regards,
Ritesh Ambastha
/usr/local/share/proj/epsg
On Thu, Aug 21, 2008 at 5:41 PM, Subha Ramakrishnan <subha at gslab.com> wrote:
> Hi,
> Could you also check the map file and tell me if i am making a mistake
> there?
> This is the map file i am using.
>
> MAP
> NAME MAP_POINTS
> SIZE 725 800
> IMAGETYPE PNG
> EXTENT 6679169.446666667 -7.081154550627918 11131949.077777777
> 4865942.278825832
> WEB
> METADATA
> wms_srs "EPSG:4326 EPSG:900913"
> END
> END
> PROJECTION
> "init=epsg:900913"
> END
> LAYER
> CONNECTIONTYPE postgis
> NAME indiastates
> CONNECTION "user=postgres dbname=test host=localhost"
> TYPE POINT
> STATUS DEFAULT
> #DATA "topology from states"
> DATA "topology from india_states using unique id using SRID -1"
> CLASS
> COLOR 255 0 0
> END
> END
> END
>
> Is it possible for you to share your map file if you have any?
>
> Regards,
> Subha
>
> Rafael Almeida Fernandez Soto wrote:
>
>> Subha..
>>
>> You need to insert a EPSG:900913 description code in PROJ4 config files
>> and a row in spatial_ref_sys table in postgis DB. By default PROJ4 has not a
>> 900013 projection reference.
>>
>> Try it!
>>
>> Best regards
>>
>> Rafael Soto
>>
>> 2008/8/20 Subha Ramakrishnan <subha at gslab.com <mailto:subha at gslab.com>>
>>
>>
>> Hi :
>> We are building a map based web portal using openlayers ,UMN
>> mapserver[5.0.2] and postgis DB.We use google as the base map
>> through openlayers.We need to overlay our custom layers from the
>> db on top of this base map, for that we are using Mapserver (is
>> run on a FC7 linux machine). It is observed that by default
>> openlayers converts google projection [900913] to EPSG:4326 when
>> the base map is fetched.
>>
>> Now when we try to overlay an image that the mapserver generates,
>> there is a mismatch on the base map, though mapserver uses
>> epsg::4326. After searching over the internet theere seems to be
>> only one solution which is displaying the base map itself in
>> epsg:900913 and emit the mapserver image also in the same
>> projection. The problem is we are not able to generate an image
>> through mapserver in epsg::900913.
>>
>> We have taken following measures untill now :
>>
>> 1> For using epsg:900913 projection in mapserver, we have added
>> following entry in the /usr/local/share/proj/epsg file.[proj
>> version 4.6]
>> "<900913> +proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0
>> +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +no_defs <>" 2>
>> We have added following entry in the "in the spatial_ref_sys table
>> in postgis DB.
>> "900913 ,'EPSG',900913,'GEOGCS["WGS 84", DATUM["World Geodetic
>> System 1984", SPHEROID["WGS 84", 6378137.0,
>> 298.257223563,AUTHORITY["EPSG","7030"]],
>> AUTHORITY["EPSG","6326"]],PRIMEM["Greenwich", 0.0,
>> AUTHORITY["EPSG","8901"]], UNIT["degree",0.017453292519943295],
>> AXIS["Longitude", EAST], AXIS["Latitude",
>> NORTH],AUTHORITY["EPSG","4326"]],
>> PROJECTION["Mercator_1SP"],PARAMETER["semi_minor", 6378137.0],
>> PARAMETER["latitude_of_origin",0.0], PARAMETER["central_meridian",
>> 0.0], PARAMETER["scale_factor",1.0], PARAMETER["false_easting",
>> 0.0], PARAMETER["false_northing", 0.0],UNIT["m", 1.0], AXIS["x",
>> EAST], AXIS["y", NORTH],AUTHORITY["EPSG","900913"]] |','+proj=merc
>> +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0
>> +k=1.0 +units=m +nadgrids=@null +no_defs'); The mapfile is as
>> follows: (With this, We get a blank image without any exception.)
>> MAP
>> NAME MAP_POINTS
>> SIZE 725 800
>> IMAGETYPE PNG
>> EXTENT 6679169.446666667 -7.081154550627918 11131949.077777777
>> 4865942.278825832
>> WEB
>> METADATA
>> wms_srs "EPSG:4326 EPSG:900913"
>> END
>> END
>> PROJECTION
>> "init=epsg:900913"
>> END
>> LAYER
>> CONNECTIONTYPE postgis
>> NAME indiastates
>> CONNECTION "user=postgres dbname=test host=localhost"
>> TYPE POINT
>> STATUS DEFAULT
>> #DATA "topology from states"
>> DATA "topology from india_states using unique id using SRID -1"
>> CLASS
>> COLOR 255 0 0
>> END
>> END
>> END
>>
>> The client (openlayer) code is as follows :
>> options = {
>> projection: new OpenLayers.Projection("EPSG:900913"),
>> displayProjection: new OpenLayers.Projection("EPSG:4326"),
>> units: "m",
>> maxResolution: 156543.0339,
>> maxExtent: new OpenLayers.Bounds(-20037508, -20037508,
>> 20037508, 20037508.34)
>> };
>> map = new OpenLayers.Map('map', options);
>> var gphy = new OpenLayers.Layer.Google("Google
>> Physical",{type: G_PHYSICAL_MAP,'sphericalMercator': true});
>> map.addLayers(gphy);
>> var lonLat = new OpenLayers.LonLat(82, 23) ;
>>
>> lonLat.transform(map.displayProjection,map.getProjectionObject());
>> map.setCenter(lonLat,5);
>> var wms ;
>> wms = new OpenLayers.Layer.WMS( layername,
>> "http://localhost/cgi-bin/mapserv?",
>> { map: 'demo.map',
>> projection:"EPSG:900913",
>> transparent: 'true', layers: 'indiastates',
>> format: 'image/png'},{singleTile: 'true'} );
>> map.addLayer(twms1);
>>
>> Can anyone help us in any way?
>> Also,
>> We have tried overlaying layer fetched from our map server
>> on different basemaps from (meta carta and tera pages) and have
>> found it overlays perfectly So clearly there is is problem
>> overlaying on google map through openlayers in epsg : 4326.
>> Thanks and sorry for the long mail.
>> Expecting a reply.
>>
>> Subha.
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>>
>>
>>
>>
>> --
>> RAFAEL Almeida Fernandez Soto :: rafael at opengeo.com.br <mailto:
>> rafael at opengeo.com.br>
>> Consultant in FOSS GIS :: 55 21 2518-6233 :: 55 71 8802-0600
>> OpenGEO :: On-demand training and solutions :: www.opengeo.com.br <
>> http://www.opengeo.com.br>
>> GEO Livre community:: Because Geoinformation should be free ::
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>> gvSIG...
>>
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>
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