[mapguide-users] [MGOS 2.1]Wrong coordinate system with GeoTiff files

[Dave Wilson]

>From my experience the WGS84 tag that is often written into a GeoTiff is not interpreted as a valid CS. I've seen that written by default into many files regardless if the WGS84 is actually the cs or not.

If you know the data is actually WGS84 then you should do a coordinate system override and select LL84 as your cs.

Dave

-----Original Message-----
From: mapguide-users-bounces at lists.osgeo.org [mailto:mapguide-users-bounces at lists.osgeo.org] On Behalf Of Hardt
Sent: Monday, December 14, 2009 2:25 AM
To: mapguide-users at lists.osgeo.org
Subject: [mapguide-users] [MGOS 2.1]Wrong coordinate system with GeoTiff files


Hi all,

I am again fighting with rasters...

I create a dataconnection with GDAL provider, using a Geotiff from ArcGIS
9.3.1.
This GeoTIFF contains the coordinates, and when I add the newly created
layer to a map, it  detects automatically the initial map view correctly.

However, the layer is displayed in meters instead of decimal degrees.

I checked the config file from the dataconnection, and the projection is

LOCAL_CS["*XY-MT*",LOCAL_DATUM["*X-Y*",10000],UNIT["Meter",
1],AXIS["X",EAST],AXIS["Y",NORTH]]

But the GeoTIFF is supposed to be in WGS84 (for the little story, the image
is captured from Google Earth in MapWindow using the Shape2Earth plugin,
then I import it in ArcGis to export it as a GeoTIFF; ArcGIS open it with
decimal degrees, and if I open the GeoTiff in another GIS software, the
GeoTiff is detected as WGS84 too; so to me it's definitely something with
MGOS)

How can I fix this ?

Thanks,

Hardt
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