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

[Billy Newman]

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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