[Qgis-developer] [Plugin presentation] LayerBender

[Olivier Dalang]

Hi Denis,

The old-to-new plans scenario I was talking about is with very old maps,
which have strong deformations (actually mapping errors).

But still, I like the idea of being able to stick to a simpler
transformation even with more points, least-squaring the points.

The main difference is that allowing this would also lead to results where
the entered points do not perfectly match after the transformation, making
the "transform pairs to pin" option unusable, which won't be easy to deal
with from and UI point of view...

I'll keep it in mind though !

Thanks for the feedback !!

Olivier






2014-05-27 7:51 GMT+02:00 Denis Rouzaud <denis.rouzaud at gmail.com>:

>  Hi Olivier,
>
> Once more, you did a really great job!
>
> I just wonder about the technique when you have enough points (>7).
> In case of mathcing old to new plans, isn't it better to do an affine
> transformation (scale, translation and rotation) using least-squares rather
> than doing a triangulation?
> You might have better visual results with the triangulation, but  the
> affine would lead to more coherent results.
>
> Cheers,
>
> Denis
>
>
>
> On 26.05.2014 21:18, Olivier Dalang wrote:
>
> Dear lists,
>
>  I'm happy to present my new plugin called "LayerBender".
>
>  It's purpose is to allow to align/distort vector layers to match a
> source, very much like georefencer does for raster. It seems ArcGIS and
> OpenJump call this feature "Rubber sheeting".
>
>  Demonstration video : https://vimeo.com/96142479
>
>  I needed this in a project I'm working on to align some already
> digitized historical maps.
>
>  Please note that the plugin is still experimental and not much tested
> yet (and only under windows)... So please be understanding in case of
> problems !
>
>  All feedback is welcome, either here or on
> https://github.com/olivierdalang/VectorBender
>
>  Hope you like it !
>
>  Best,
>
>  Olivier
>
>
>
>
>
>
> _______________________________________________
> Qgis-developer mailing listQgis-developer at lists.osgeo.orghttp://lists.osgeo.org/mailman/listinfo/qgis-developer
>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/qgis-developer/attachments/20140527/3794a30c/attachment-0001.html>