[mapguide-users] Sheboygan Dataset on mgos 1.2 beta

[Traian Stanev]

I compared lat-lon values reported in the DWF viewer (and also the map
extents computed from the data) to the actual lat-lon location of
Sheboygan, and the districts layer is much farther off the correct
values than all the other layers. So we must be transforming the
districts layer incorrectly.

Traian

-----Original Message-----
From: mapguide-users-bounces at lists.osgeo.org
[mailto:mapguide-users-bounces at lists.osgeo.org] On Behalf Of Walt
Welton-Lair
Sent: Tuesday, April 10, 2007 12:31 PM
To: MapGuide Users Mail List
Subject: RE: [mapguide-users] Sheboygan Dataset on mgos 1.2 beta

I've tracked down the problem to the Sheboygan data set itself.  All
source data in the data set should be using the same coordinate system.
In our case though, the VotingDistricts feature source shows "LL84"
while all the others show some a different one - "WGS84 Lat/Long's,
Degre" ...  The WKTs for these two are different.

The key difference in the WKTs - the part that's causing the shift - is
in the inverse flattening parameter of the SPHEROID.  In one the value
is 0, and in the other it's 298.  So to fix this I think we simply need
to republish all the data files for the data set using the same
coordinate system (and also make sure it's the right one).

Walt

-----Original Message-----
From: mapguide-users-bounces at lists.osgeo.org
[mailto:mapguide-users-bounces at lists.osgeo.org] On Behalf Of Brad Nesom
Sent: Tuesday, April 10, 2007 2:43 PM
To: 'MapGuide Users Mail List'
Subject: RE: [mapguide-users] Sheboygan Dataset on mgos 1.2 beta

Yes Jackie,
  I see the same. Districts to the north by about 200%.
Brad

-----Original Message-----
From: mapguide-users-bounces at lists.osgeo.org
[mailto:mapguide-users-bounces at lists.osgeo.org] On Behalf Of Jackie Ng
Sent: Monday, April 09, 2007 4:26 PM
To: mapguide-users at lists.osgeo.org
Subject: [mapguide-users] Sheboygan Dataset on mgos 1.2 beta


Hi All,

I've been playing around with the 1.2 beta and I've noticed when I
brought
up the Sheboygan Sample Dataset, that the "Districts" layer has been
displaced to the north. 

Has anyone else noticed this? Problem with the data? Regression in
MapGuide?

Regards,

- Jackie
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