[mapguide-internals] tile edge effects using gdal provider in tiledmode

Andy Morsell amorsell at spatialgis.com
Tue Feb 20 11:19:22 EST 2007

Hi Paul,
This is not an artifact of the GDAL provider but rather of using base layers
(tiles) in your map definitions.  I ran into this same issue last week with
a client and on my demo server with 1.1.0.  I posted a message to this group
last week with several "I have that problem too" responses but nothing from
the developers.  I remember this issue from awhile back and was due to the
whit lines being a hidden SDF tile index that was drawing.  I thought it was
slated to be fixed, but I am unsure if an issue in Issue Tracker was ever


-----Original Message-----
From: mapguide-internals-bounces at lists.osgeo.org
[mailto:mapguide-internals-bounces at lists.osgeo.org] On Behalf Of Paul
Sent: Tuesday, February 20, 2007 8:11 AM
To: MapGuide Internals Mail List
Subject: [mapguide-internals] tile edge effects using gdal provider in

I've got a client using the GDAL provider to render an ECW file.   
He's set up the map/viewer to use tiles rather than straight map draws and
he is getting some edge effects (white lines in this case) in his tiles.
I've attached a small screengrab of part of the problem.

Any ideas?  Could this be a problem with the provider or is it more likely a
problem elsewhere?  Note that the edge effects do not appear on every tile,
nor on every edge of every tile, so perhaps it is a rounding issue in tile
generation somewhere?  Or in the provider?

|Paul Spencer                          pspencer at dmsolutions.ca    |
|Chief Technology Officer                                         |
|DM Solutions Group Inc                http://www.dmsolutions.ca/ |

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