[Qgis-developer] Re: [Qgis-user] Helmert 7 param transformation

Marco Hugentobler marco.hugentobler at sourcepole.ch
Tue Sep 14 02:10:00 EDT 2010

Hi Zoran

QGIS supports Helmert transformation in the georeferencer plugin and outputs 
the transformation parameters (optionally also as a pdf page output). Is this 
what you are looking for?


Am Montag, 13. September 2010, um 18.50:43 schrieb Zoran Jankovic:
> Hi guys and girls,
> I sent this message once before, but I do not think it got through, so I'm
> reposting.
> I know this is slightly off topic, but I ran out of places to ask... I'm
> looking for a piece of software, it could be a standalone app, or some
> JavaScript somewhere, that can calculate the 7 parameters of Helmerts
> transformation from the coordinates of identical points. Lots of
> applications can transform CRS, even on the fly, but I need something to
> calculate the parameters...
> The thing is I'm preparing for an exam, this is like a bar exam so I can
> get to be a certified surveying engineer, and one of the questions is to
> calculate the params. A decade ago, when I was a student, I had the
> formulas in a Sharp programmable calculator (that I borrowed :-)). Alas,
> both the knowledge, as well as the programmable calculator got lost
> somewhere over the years :-)
> ---
> Zoran Jankovic

Dr. Marco Hugentobler
Sourcepole -  Linux & Open Source Solutions
Webereistrasse 66, 8134 Adliswil, Switzerland
marco.hugentobler at sourcepole.ch http://www.sourcepole.ch
Technical Advisor QGIS Project Steering Committee

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