Forgot to mention that a panel in which the parameters
could be entered both as you have them and ordered as the
affine transformation matrix would be appreciated by
most users. I think this is how ArcView has it (I do not
use it myself). I find this document useful:
www.quantdec.com/GIS/affine.htm
Agus
Agustin Lobo wrote:
The problem with "Capture From Map Canvas" is
that you need 2 canvas, unless both the original and the reference
objects are
be very close. The Georeferencer plugin opens the raster to be
processed in a special window, but that window does not
let you display a vector. Perhaps that would be enough, a window
such as the one in Georeferencer but for vectors.
By now, I'm going to try using Coordinate capture twice, once for the
vector to be warped and the other for the reference object. Then
input both sets of coordinates into R and calculate
the affine transformation matrix there. Then I can either
go on with the actual transformation in R (package spatstat)
and then export to QGIS (this is comfortably done thanks to
manageR) or use your plugin.
Agus
Maurício de Paulo wrote:
Hum... you mean like georreferencing the vectors?
While reading your mail I thought about a "Capture From Map Canvas"
for the two translation coordinates.
Well, I don't know how the georreferencer is written, but I can try to
think about reusing it's code. I'm going to take a look at it.
Thanks for the tip.
Best regards,
Mauricio de Paulo
On Fri, Nov 27, 2009 at 9:36 AM, Agustin Lobo <[email protected]
<mailto:[email protected]>> wrote:
Hi!
It's often the case in which you actually don't know
the values for the affine transformation for
plugin qgsAffine but just some pairs of corresponding coordinates.
I understand that including a facility such as the one for raster
georeference would be very useful but quite a work, thus I wonder
if the raster georeference plugin could actually output this
information which could then be fed to qgsAffine?
Agus
-- Dr. Agustin Lobo
Institut de Ciencies de la Terra "Jaume Almera" (CSIC)
LLuis Sole Sabaris s/n
08028 Barcelona
Spain
Tel. 34 934095410
Fax. 34 934110012
email: [email protected] <mailto:[email protected]>
http://www.ija.csic.es/gt/obster
_______________________________________________
Qgis-user mailing list
[email protected]
http://lists.osgeo.org/mailman/listinfo/qgis-user
