[mapguide-internals] tile edge effects using gdalproviderintiledmode

[Traian Stanev]

It's probably a rounding error in the image drawing function then.


-----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 11:37 AM
To: 'MapGuide Internals Mail List'
Subject: RE: [mapguide-internals] tile edge effects using
gdalproviderintiledmode

I am able to confirm that this same problem occurs with the Autodesk
Raster
provider on MGE and does not occur with vector data on MGE. So, it
appears
that the GDAL provider is probably not at fault.


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 8:29 AM
To: MapGuide Internals Mail List
Subject: Re: [mapguide-internals] tile edge effects using gdal
providerintiledmode

Has anyone seen this with MGE and the ADSK raster provider?  I'll file a
bug
(as suggested by Frank) but I would like to be sure that the code that
requests the tile is doing the right thing before asking Frank to look
further into the GDAL provider.  If it works in MGE then it seems likely
that the problem resides in the GDAL provider, if not then it would seem
likely that the problem is in the code requesting the image instead.

Cheers

Paul

On 20-Feb-07, at 11:24 AM, Walt Welton-Lair wrote:

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