[fusion-trac] #434: Projection handling problems (defs folder and not passing wkt for parsing)

[Fusion]

#434: Projection handling problems (defs folder and not passing wkt for parsing)
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 Reporter:  zspitzer  |         Owner:  madair   
     Type:  defect    |        Status:  reopened 
 Priority:  P2        |     Milestone:  2.2      
Component:  MapGuide  |       Version:  2.2 - RC1
 Severity:  Major     |    Resolution:           
 Keywords:            |   External_id:           
    State:  New       |       Browser:  All      
       Os:  All       |  
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Comment(by jng):

 From my experience, driving things through WKTs is unreliable (problem
 with proj4js. I wish we could just tap into cs-map from javascript!
 Problem would be solved!)

 If we can do things via EPSG and supply the required proj4 string where
 needed to Proj4js.defs (hence the idea of #535 to avoid external lookups),
 things are usually better.

 So in this case, mapagent ConvertWktToEpsgCode says epsg is 2056

 [http://www.spatialreference.org/ref/epsg/2056/ spatialreference.org] says
 the proj4 string for this is:

 {{{
 +proj=somerc +lat_0=46.95240555555556 +lon_0=7.439583333333333 +k_0=1
 +x_0=2600000 +y_0=1200000 +ellps=bessel
 +towgs84=674.374,15.056,405.346,0,0,0,0 +units=m +no_defs
 }}}

 So I'm guessing you'd have to do this somewhere in the fusion
 initialization process (or if #535 is implemented, as an CustomProjections
 widget extension property):

 {{{
 Proj4js.defs["EPSG:2056"] = "+proj=somerc +lat_0=46.95240555555556
 +lon_0=7.439583333333333 +k_0=1 +x_0=2600000 +y_0=1200000 +ellps=bessel
 +towgs84=674.374,15.056,405.346,0,0,0,0 +units=m +no_defs"
 }}}

 We could probably construct a csmap to proj4 lookup list to do this
 seamlessly. LoadMap.php would just consult this lookup list to setup the
 correct OpenLayers.Projection and construct the required Proj4js.defs
 entry if required.

-- 
Ticket URL: <http://trac.osgeo.org/fusion/ticket/434#comment:9>
Fusion <http://trac.osgeo.org/fusion>
Fusion is a web-mapping application development framework for MapServer and MapGuide OS.