[gdal-dev] Re: How to divide a raster layer into a set of tiles?

[Gilles Bassière]

Christian Müller wrote:
> That is a surprise.
> In all my tests I had no memory problems with gdal_retile. Sometimes I
> had some memory problems with gdal_merge. The biggest input file for
> gdal_retile was a 80 GB Erdas image (not compressed) and it works fine.
> I have never testet with an ECW File and my tests run on a Linux Box or
> AIX Box.
> Perhaps the problem is in the ECW gdal driver. You can try to transform
> your ecw file in another format using gdal_transform.
> 

That's may be caused by something wrong with the ECW driver indeed. I
will test gdal_retile again once I have a clean GDAL+ECW install.

Regards
Gilles

> 
> 
> Gilles Bassière writes:
>> Christian Müller wrote:
>>> gdal_retile.py definitely creates georeferenced tiles, I developed this
>>> utility.
>>> I did some experiments reprojecting the single tiles while retiling, but
>>> it simply does not work. As a consequence I canceled the reprojecting
>>> support.
>>> The solution for your problem is:
>>> 1) Use gdal_merge to create the big image
>>> 2) reproject with gdal_warp
>>> 3) use gdal_retile to create your new tiles
>>> I did a lot of experiments to avoid creating the big picture without
>>> success.
>>
>> I understand. In my case, gdal_retile.py eventually crashed with a
>> Python MemoryError. I assume it is unsurprising with a 7.5GB input for a
>> single Python process.
>>>
>>> Even Rouault writes:
>>>> Le Monday 22 March 2010 19:35:47 Gilles Bassière, vous avez écrit :
>>>>> Hi,
>>>>> The problem with this workflow is that it creates non-georeferenced
>>>>> tiles (I don't know if this is the intended behaviour of this
>>>>> command).
>>>>
>>>> gdal_retile.py *does* create georeferenced tiles. I've just verified
>>>> it. What make you think the contrary ?
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>>
>> -- 
>> Gilles Bassière - Web/GIS software engineer
>> http://gbassiere.free.fr/
> 
> 


-- 
Gilles Bassière - Web/GIS software engineer
http://gbassiere.free.fr/