[MS4W-Users] How to mention multiple projections in MapServer MAPFILE?

[Stephen Woodbridge]

On 1/8/2014 5:11 PM, Robert Sanson wrote:
> Hi Stephen et al
>
> This is very clear for when your underlying map layers are in
> different projections. But can you list multiple projections in the
> main Map section, such that Mapserver can serve data in more than one
> projection? For example, one client might send a GetMap request for
> data in UTM 48 (epsg:26915), another might ask for it in Spherical
> Mercator (epsg:900913 or epsg:3857).

Yes if you configure your mapfile for WMS then you can include something 
like:

MAP
   ...
   WEB
     METADATA
       ows_title "Example_WMS"
       ows_onlineresource 
"http://example.com/cgi-bin/mapserv?map=/maps/example.map&"
       ows_srs "EPSG:4326 EPSG:900913"
       ows_enable_request "GetMap"
     END
   END
...

You can list all the projections that you want your mapfile to serve on 
ows_srs. You should define the some projection ... end block in the MAP 
object and all layers that are not in the MAP object's projection should 
have a projection ... end block and it is probably smart to define all 
layers with a projection ... end block. The layer projection should 
ALWAYS define the projection the source data is in.

-Steve W

> Many thanks,
>
> Robert
>
>>>> Stephen Woodbridge <woodbri at swoodbridge.com> 4/01/2014 3:25
>>>> a.m. >>>
> Shiva,
>
> To be explicit, mapserver does not support a layer where each
> geometry has its own projection. You will need to separate the data
> into multiple tables where all geometries in any given table are the
> same projection.
>
> -Steve W
>
> On 1/3/2014 9:03 AM, Mark Volz wrote:
>> Shiva,
>>
>> Mapserver can take data from multiple layers and project each
>> layer.  However you need to specify the projection of your map, and
>> the projection that your incoming layers use.  I do not think
>> Mapserver will automatically read a .prj file.
>>
>> Here is how you can take data from three projections and make a
>> final map in UTM 48:
>>
>> MAP #make mapserver produce a final map in UTM 48 PROJECTION
>> "init=epsg:26915" END PROJECTION ... LAYER #source data in UTM 47
>> PROJECTION "init=epsg:26947" END PROJECTION ... END LAYER LAYER
>> #source data in UTM 48 PROJECTION "init=epsg:26948" END PROJECTION
>> ... END LAYER LAYER #source data in UTM 49 PROJECTION
>> "init=epsg:26949" END PROJECTION ... END LAYER END MAP
>>
>>
>> Mark Volz, GISP GIS Specialist
>>
>>
>>> -----Original Message----- From:
>>> ms4w-users-bounces at lists.maptools.org [mailto:ms4w-users-
>>> bounces at lists.maptools.org] On Behalf Of shiva.sk4 Sent: Friday,
>>> January 03, 2014 7:11 AM To: ms4w-users at lists.maptools.org
>>> Subject: Re: [MS4W-Users] How to mention multiple projections in
>>> MapServer MAPFILE?
>>>
>>> Can we specify multiple projections (in this case 3) to indicate
>>> to mapserver that the map data may lie within these projection
>>> systems and in each individual layer definitions mention
>>> projection as *auto* so that it projects the data according to
>>> the *SRID* for each geometry record?
>>>
>>>
>>>
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>>> to-mention-multiple-projections-in-MapServer-MAPFILE-
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