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

[Kshitij Kansal]

Hello

Based on all suggestions and comments above, I have come up with one thing.

The most important thing that could have been a road block for this project
was licence issues which was pointed by Even Rouault.

I am interested in implementing the SIFT or ASIFT algorithms for automatic
geo-referencing which I proposed in above mails. I am interested in making
a separate tool which will be completely based on the GDAL and maintained
by GDAL community. I looked into the GDAL-correlator idea which was also
implemented as a part of GSoC. That idea uses only *SIMPLE SURF *algorithm
for control point detection and is only *limited to small size three band
imagery(RGB)*.

I am interested in developing something that is fully automated and works
on large multi band imagery.But the above two algorithms that I am planning
to use come up with the licence that does not allows the free use for
commercial purposes. The free use of above algorithm are restricted to *"non
profit research and non profit educational purposes"*(in case of
ASIFT) and *"research
purposes only" *(in case of SIFT).

This means that the final product as a result of this product will also be
bounded by the above licences. It can not go into GDAL's main distribution
but can be used as a separate utility of GDAL for non-commercial uses only.
Basically the commercial use of the tool won't be allowed without approval
from the concerned people.

Your views and suggestions are highly appreciated.

Regards,

Kshitij Kansal

Lab For Spatial Informatics,

IIIT Hyderabad



On Thu, Jan 30, 2014 at 12:25 PM, Kshitij Kansal <kansal.k at gmail.com> wrote:

> Hello
>
> @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
> that.
>
> 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.
>
> Regards,
>
>  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-
>>
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>>
>
>
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