[Qgis-user] Helmert 7 param transformation

[Siki Zoltan]

Hi,

The Georefencer plugin is useful for 2D transformation (Helmert 4 
parameter, affine, etc.). AFAIK 7 parameter 3D transformation is not 
available in QGIS.

You can use cs2cs (proj4) for known projections to transfor from one SRS 
to another.

Regards,
Zoltan

On Tue, 14 Sep 2010, Marco Hugentobler wrote:

> 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?
>
> Regards,
> Marco
>
> 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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