[gdal-dev] Re: Question about gdal2tiles

[Jorge Arévalo]

On Thu, Oct 29, 2009 at 1:12 PM, Jukka Rahkonen
<jukka.rahkonen at mmmtike.fi> wrote:
> Jorge Arévalo <jorge.arevalo <at> gmail.com> writes:
>
>>
>> Hello,
>>
>> I've a problem with gdal2tiles. I need to create tiles from an image
>> of 5 GB, more or less. The image has been created rasterizing a
>> shapefile. The shapefile's original projection was epsg:23028, but I
>> had to reproject it to epsg:23030 (because I had to cross this
>> shapefile with other ones in epsg:23030). To reproject, I used this:
>>
>> ogr2ogr -s_srs epsg:23028 -t_srs epsg:23030 -f "Mapinfo File" dst.mif src.mif
>>
>> Then, I rasterized the shapefile reprojected.
>>
>> After this, I execute gdal2tiles, using resampling method 'near', but
>> it takes a loooooooooong time to complete the process. With other non
>> reprojected shapefiles (in epsg 23030 originally), the process is much
>> faster. What am I doing wrong?
>>
>> Thanks in advance, and best regards
>
> Hi,
>
> Have a look at gdalinfo reports about the slow image and about one of the fast
> ones.  Check if there are considerable differences in image sizes in pixels. If
> images are about as big then look at the file formats and see if they are
> somehow different.
>
> -Jukka Rahkonen-
>
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Hello,

Sorry, I forgot to answer. Many thanks for your suggestion. I got some
shapefiles with epsg:23028 original projection and everything worked
fine.

I'll look for information about mathematical projections, I think. I
need to know...

Best regards,
Jorge