[mapserver-dev] variable substitution for projection

[Stephen Woodbridge]

On 12/21/2011 9:38 PM, Zach Aller wrote:
> Yup thats exactly what is going on we have images from different source
> that have different projections and so we have a little program that
> will get called to figure out the projection of the geotiff then with we
> need to use mapserver for some processing and there for need to change
> the projection of the said layer.
>
> Also this method did not seem to work
>
> map.layer[layername]=PROJECTION+EPSG:3158+END

this needs to be:

    map.layer[layername]=PROJECTION+"init=epsg:4326"+END

And you may nee to encode " and = chars between PROJECTION ... END

> got this error
>
> loadProjection(): Unknown identifier. Parsing error near (:):(line 1)
>
>
> On Wed, Dec 21, 2011 at 7:55 PM, Stephen Woodbridge
> <woodbri at swoodbridge.com <mailto:woodbri at swoodbridge.com>> wrote:
>
>     Zach,
>
>     Why would you want to change the projection of a layer?
>
>     The projection of a layer should be constant as it defines the
>     projection of the data that is in that layer.
>
>     So unless you are doing something like changing the data source AND
>     also needing to then change the projection because the new data is
>     in another projection, then I can not imagine that you are going to
>     get any useful results doing this.
>
>     -Steve W
>
>
>     On 12/21/2011 5:23 PM, Zach Aller wrote:
>
>         that seem's to have done the trick sort of now i am just
>         wondering if i
>         can set that for a specific layer i tried
>
>         map.layer[layername]. projection
>
>         but that did not seem to work. Setting the map projection will
>         probably
>         be fine for our project at least for now.
>
>         On Wed, Dec 21, 2011 at 11:04 AM, Lime, Steve D (DNR)
>         <Steve.Lime at state.mn.us <mailto:Steve.Lime at state.mn.us>
>         <mailto:Steve.Lime at state.mn.us <mailto:Steve.Lime at state.mn.us>
>          >> wrote:
>
>             Zach: You should be able to change the projection through
>         the URL
>             like so:
>
>                …&map.projection=EPSG:3158&…
>
>             No need to runtime subs…
>
>             Steve
>
>             *From:*mapserver-dev-bounces@ lists.osgeo.org
>         <mailto:mapserver-dev-bounces at lists.osgeo.org>
>         <mailto:mapserver-dev-bounces@ lists.osgeo.org
>         <mailto:mapserver-dev-bounces at lists.osgeo.org>>
>             [mailto:mapserver-dev-bounces@ lists.osgeo.org
>         <mailto:mapserver-dev-bounces at lists.osgeo.org>
>         <mailto:mapserver-dev-bounces@ lists.osgeo.org
>         <mailto:mapserver-dev-bounces at lists.osgeo.org>>] *On Behalf Of *Zach
>             Aller
>             *Sent:* Tuesday, December 20, 2011 5:28 PM
>             *To:* mapserver-dev at lists.osgeo.org
>         <mailto:mapserver-dev at lists.osgeo.org>
>         <mailto:mapserver-dev at lists. osgeo.org
>         <mailto:mapserver-dev at lists.osgeo.org>>
>             *Subject:* [mapserver-dev] variable substitution for projection
>
>
>             ok i am working with mapserver and a nodejs project and so i am
>             calling mapserver like so.
>
>             mapserv -nh
>         "/getPreviewImg.map&mode=map& mapext='+req.params.extent+'&
>         filename='+req.params.imgname+ '&projection=3158"
>
>             the issue is that mapserver dose not support projection
>         based run
>             time substitution and so i was wondering if that is possible
>         to add
>             and how hard it would be (maybe i could to it myself etc if
>         pointed
>             in right direction because i have no experience with
>         mapserver's src)
>
>             map file example thats what i want to replace
>
>             PROJECTION
>         "init=epsg:%projection%"
>             END
>
>             or perhaps even this then i could build what ever
>
>             PROJECTION
>                  %projection%
>             END
>
>
>
>
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