[mapguide-trac] #42: Sheboygan Districts layer is displaced

[MapGuide Open Source]

#42: Sheboygan Districts layer is displaced
----------------------------+-----------------------------------------------
 Reporter:  waltweltonlair  |         Owner:       
     Type:  defect          |        Status:  new  
 Priority:  high            |     Milestone:  1.2  
Component:  General         |       Version:  1.2.0
 Severity:  major           |    Resolution:       
 Keywords:                  |   External_id:       
----------------------------+-----------------------------------------------
Comment (by waltweltonlair):

 The problem involves the coordinate system for the Districts layer.
 Here's the WKT I get for this layer (as computed in
 MgStylizationUtil::!GetLayerToMapTransform):

 GEOGCS["LL84",DATUM["WGS 84",SPHEROID["WGS
 84",6378137,0],TOWGS84[0,0,0,0,0,0,0]],PRIMEM["Greenwich",0],UNIT["Degrees",0.01745329252]]


 For the !CityLimits layer (and for the map as a whole) the coordinate
 system WKT is:

 GEOGCS["WGS84 Lat/Long's, Degrees, -180 ==>
 +180",DATUM["D_WGS_1984",SPHEROID["World_Geodetic_System_of_1984",6378137,298.257222932867]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]]


 The main difference that caught my eye was the SPHEROID y-value.  For the
 Districts layer it's 0, while for the other WKT it's 298.2...  Isn't this
 some kind of a datum shift?

 I know some bugs were fixed around datums not too long ago.  Maybe the WKT
 for the Districts layer has been invalid all ths time, and this problem
 only showed up recently?

-- 
Ticket URL: <http://trac.osgeo.org/mapguide/ticket/42#comment:1>
MapGuide Open Source <http://mapguide.osgeo.org/>
MapGuide Open Source Internals