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

[Paul Spencer]

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/ |
+-----------------------------------------------------------------+