[mapguide-internals] tile edge effects using gdal providerintiledmode

[Andy Morsell]

I did just confirm that this does not occur with vector layers (hadn't
honestly used anything but raster for base layers before).  So, yes, perhaps
the problem does lie elsewhere. 


Andy 

-----Original Message-----
From: mapguide-internals-bounces at lists.osgeo.org
[mailto:mapguide-internals-bounces at lists.osgeo.org] On Behalf Of Walt
Welton-Lair
Sent: Tuesday, February 20, 2007 8:24 AM
To: MapGuide Internals Mail List
Subject: RE: [mapguide-internals] tile edge effects using gdal
providerintiledmode

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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