[gdal-dev] [RFC] [GDAL] Idea for GSoC, 2014

Kshitij Kansal kansal.k at gmail.com
Wed Jan 29 22:55:38 PST 2014


@Jukka Rahkonen: The OSSIM project (the link you provided) is more of image
orthorectification. Although
they are doing image co-registration but its as one of the steps of
orthorectification(I could only understand this from the manual).
Also I am not sure of the techniques they are using for this purposes. (Its
written corner point detection but How?)
I am new to OSSIM, so not aware of this thing's functionality and accuracy.
I am in the process of estimating it.

Thank you for pointing this out.

Coming to the Frank Warmerdam's blog (http://fwarmerdam.blogspot.fi/). Here
the author is talking about writing a code for converting the GCP's into
RPC's. But the next question comes is where is he getting GCP's from. Now
this is the part where I aim to work on and improve.

Given two images, if we can automatically extract GCP's from them then we
are in a way speeding up and automating this whole process. Once we have
GCP, there are a lot of things that we can do from them like
geo-referencing(which I plan on doing), image stitching etc.

*Also you talked about a "more light weighted system". Can you please
elaborate on this?* I could not understand what you actually meant from

If we look into the last year idea's page (
http://trac.osgeo.org/gdal/wiki/SummerOfCode), there is one idea that is
proposed regarding the "Raster/Vector geo-referencer on the Web". I want to
modify this idea a little bit and want to automate the whole process. As
far as the automation is concerned, we can develop GDAL functions for
that(which will be completely re-usable) and then developing a Web based
geo-referencer would only require calling those functions.

If we do this thing,* two objectives will be fulfilled*.* First*, GDAL will
get a web based geo-referencer. *Secondly*, communities that use GDAL and
have not developed these kind of geo-referencer(Like QGIS) can directly use
the functions developed and then build on that.

Suggestions and comments are welcomed.

Thank you for your propositions.


Kshitij Kansal

Lab For Spatial Informatics,

IIIT Hyderabad

On Wed, Jan 29, 2014 at 1:27 PM, Jukka Rahkonen
<jukka.rahkonen at mmmtike.fi>wrote:

> Kshitij Kansal <kansal.k <at> gmail.com> writes:
> >
> > Even,
> > Thank you for pointing out this issue. I will keep this in mind.
> >
> > I will look into that last year project and try to understand the
> implementation.
> >
> > More suggestions and comments are always welcomed.
> Hi,
> Another OSGeo project OSSIM has implemented an automatic image to image
> rectification. Isn't that a bit alike your plan?
> http://download.osgeo.org/ossim/docs/OSSIM_Coregistration_UserManual.pdf
> Frank Warmerdam seems to entertain himself with something related
> http://fwarmerdam.blogspot.fi/
> This article from 2013 may also give some inspiration
> http://www.academia.edu/4388853/OrientAL_-_Automatic_geo-referencing_and_ortho-rectification_of_archaeological_aerial_photographs
> All these three aim to very high quality and I am sure that there is also
> need for a more light-weight system.
> -Jukka Rahkonen-
> _______________________________________________
> gdal-dev mailing list
> gdal-dev at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/gdal-dev
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