[gdal-dev] Speed up gdaltranslate for really big tiffs

[Etienne Tourigny]

You know you can have a single file with many overview levels, right?
Why so many files?

On Fri, Nov 16, 2012 at 7:56 PM, Billy Newman <newmanw10 at gmail.com> wrote:
> In general I having problems generating big tiffs in a timely manner.
>
> I also have the following scenario in which I am trying to create an
> overview tiff from some already existing tiffs.
>
> image.tif (524288, 262144)
> image.tif.ovr
> image.tif.ovr.ovr
> image.tif.ovr.ovr.ovr
> image.tif.ovr.ovr.ovr.ovr
> image.tif.ovr.ovr.ovr.ovr.ovr
> image.tif.ovr.ovr.ovr.ovr.ovr.ovr
> image.tif.ovr.ovr.ovr.ovr.ovr.ovr.ovr
> image.tif.ovr..ovr.ovr.ovr.ovr.ovr.ovr.ovr
>
> Each overview is a factor of 2 smaller.
>
> When I create the final tiff with overviews:
>
> gdal_translate image.tif image_w_overview.tif -co COPY_SRC_OVERVIEWS=YES
>
> I assume that the destination tiff needs to be completely recreated.
> This is taking a really long time.  > day.
>
> Any ideas on how I can create this final overview tiff in a more
> timely manner as well.
>
> Is my file just too big to expect the overview to be created faster?
>
> Thanks again!
>
> On Fri, Nov 16, 2012 at 1:18 PM, Even Rouault
> <even.rouault at mines-paris.org> wrote:
>> Le vendredi 16 novembre 2012 21:12:07, Billy Newman a écrit :
>>> I have a process that is stitching together a lot of tif files to
>>> create on big tif.
>>>
>>> I am doing:
>>>
>>> gdalbuildvrt output.vrt *.tif
>>> gdaltranslate -co COMPRESS=LZW output.vrt final.tif
>>>
>>> Any more options that I can throw at gdaltranslate to speed up the
>>> translation?
>>
>> If your target TIFF has very large dimensions, it might perhaps be helpful to
>> make it tiled with -co TILED=YES .
>>
>>>
>>> Thanks!
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