[mapguide-internals] tile edge effects using gdal provider intiledmode

[Walt Welton-Lair]

It seems this problem only occurs when rendering raster data into tiles.
Vector data seems ok, right?  If that's the case, then it probably just
a rounding error in the code which draws the raster image.

Walt

-----Original Message-----
From: mapguide-internals-bounces at lists.osgeo.org
[mailto:mapguide-internals-bounces at lists.osgeo.org] On Behalf Of Andy
Morsell
Sent: Tuesday, February 20, 2007 5:19 PM
To: 'MapGuide Internals Mail List'
Subject: RE: [mapguide-internals] tile edge effects using gdal provider
intiledmode

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
entered.


Andy 

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

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




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