[gdal-dev] Fastest way to add the GeoTransform to a raster file
rigal at rapideye.de
Fri Sep 19 08:43:31 EDT 2008
Thanks to all the three for your quick responses !
I am getting several infos from the mailing list archives since one year, but
since I couldn't get more infos about that subject, I decided to also ask a
question here, and I'm happy to have done that !
My first question was to unprecise, sorry. I forgot to mention that I'm
working with GTiff palette images.
So, dear Matt, your script does not work, since even in update mode, I am not
able to set a GeoTransform to it. I get this error:
ERROR 6: SetGeoTransform() is only supported on newly created GeoTIFF files.
From what I understand, there is no other way as to Create, set a
GeoTransform, and copy the layers.
I will precise what I want to do :
After getting an optimized palette version of original R, G, B GeoTiff
channels, through transformation with the PIL library, this image became
I want to reproject this image to a spherical mercator projection. If I use
the Create way, there will be one step more.
At the beginning I wanted to modify the source dataset, but there might a way
to add the GeoTransform "on-the-fly", before the Reprojection... but I
couldn't find one... I'll accept all suggestions !
Frank, if there is no way to solve the upper "reflexion", and because you
mentioned the possible use of the gdal utilities, would you recommend to call
the utility from within the python script or rather to use the module's
functions (I'll go for the second one naturally).
On Thursday 18 September 2008 21:06:06 you wrote:
> Will this work?
> matt wilkie
> Geographic Information,
> Information Management and Technology,
> Yukon Department of Environment
> 10 Burns Road * Whitehorse, Yukon * Y1A 4Y9
> 867-667-8133 Tel * 867-393-7003 Fax
> Matthieu Rigal wrote:
> > Hi all,
> > Since the method of Create, SetGeoTransform, etc... is "complicated" and
> > unefficient from a performance point of view, what is the way to quickly
> > add the GeoTransform, taken from a referenced raster to a raster that
> > have lost the information.
> > Best regards,
> > Matthieu
On Thursday 18 September 2008 18:09:13 you wrote:
> I assume the approach that is complicated is to create a
> whole new image with Create(), setting the geotransform on
> that and then copying over all the image data. is that what
> you mean?
> What format of imagery are you working with? There are
> different limitations on different drivers with regard to updating
> georeferencing "in place". For for some formats you can just
> open a dataset in update mode, and call SetGeoTransform()
> to update the georeferencing. For other formats this is not
> Some formats support world files with various extensions. For
> these formats the easiest approach might be to just manually
> write out a world file.
> From the commandline the easiest way is to use gdal_translate
> and the -a_ullr switch though internally this is of course creating
> a new dataset and copying everything over.
> Best regards,
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