gdal2tiles - generating overview tiles are empty

[Roger Fowkes]

I solved my earlier trouble with the PIL and numpy libraries.   But now when processing a .TIF file, the base tiles are created correctly, but all additional overview layer tiles are empty or transparent.  The process dialog indicates successful creation of images and all the folders and files exist, but they are empty, no imagery data from the base tiles are collected.

 

Roger Fowkes

MiraLinx, LLC

(480) 208-1050

(480) 233-2075 Mobile

ro...@miralinx.com

 

 

[Roger Fowkes]

A little more info on this bug…

 

When using –r antialias with gdal2tiles the base tiles are rendered correctly, but the overview tiles are empty.  If I remove the –r antialias, the overview tiles render successfully.

 

Is there a fix for this?

 

Roger Fowkes

MiraLinx, LLC

(480) 208-1050

(480) 233-2075 Mobile

ro...@miralinx.com

 

[klo...@gmail.com]

Roger,

> When using –r antialias with gdal2tiles the base tiles are rendered
> correctly, but the overview tiles are empty. If I remove the –r antialias,
> the overview tiles render successfully.
>
> Is there a fix for this?

Upgrade to the latest version of gdal2tiles.py, from maptiler svn.

BTW there is no need to use PIL and 'antialias' rendering unless you
need to make the tile tree merging which is described in the thread:
http://groups.google.com/group/maptiler/browse_thread/thread/245b4f568ce68037
In that thread I am also recommending upgrade of gdal2tiles and you
find there the direct link to SVN.

The default 'average' scaling algorithm produce very good results for
most maps, and there is no problem with that one - the overview tiles
are rendered always correctly, if you have GDAL 1.6+.

Best regards,

Klokan Petr Pridal

> ________________________________
>
> From: mapt...@googlegroups.com [mailto:mapt...@googlegroups.com] On Behalf
> Of Roger Fowkes
> Sent: Monday, July 06, 2009 12:14 AM
> To: mapt...@googlegroups.com
> Subject: [maptiler] gdal2tiles - generating overview tiles are empty
>
>
>
> I solved my earlier trouble with the PIL and numpy libraries.   But now when
> processing a .TIF file, the base tiles are created correctly, but all
> additional overview layer tiles are empty or transparent.  The process
> dialog indicates successful creation of images and all the folders and files
> exist, but they are empty, no imagery data from the base tiles are
> collected.
>
>
>
> Roger Fowkes
>
> MiraLinx, LLC
>
> (480) 208-1050
>
> (480) 233-2075 Mobile
>
> ro...@miralinx.com
>
>
>
>
>
> >
>
>

--
http://blog.klokan.cz/
http://www.maptiler.org/
http://www.oldmapsonline.org/