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

[Christian Müller]

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. 

 


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