[Qgis-user] use raster + GCP points + ?? as data

[Kris Nackaerts]

Hi,

I would go for GeoTiffs. Store the GCPs inside the Geotiffs (via for example gdal_translate -gcp ...) and when needed, perform the warping (gdalwarp ...).

I've no idea other tools support this gcp feature.

Kris

-------- Original-Nachricht --------
> Datum: Mon, 11 Jul 2011 23:27:14 -0700
> Von: Alex Mandel <tech_dev at wildintellect.com>
> An: qgis-user at lists.osgeo.org
> Betreff: Re: [Qgis-user] use raster + GCP points + ?? as data

> On 07/11/2011 10:30 PM, Richard Duivenvoorde wrote:
> > Hi all,
> > 
> > I have these pile of scanned old maps and can georeference them with the
> > good working georeferencer plugin in qgis.
> > 
> > But do NOT want to really warp the image. Why should we want to store
> > TWO huge rasters, maybe loosing 'data' contained in the 'original'?
> > 
> > So my question: is it possible (for Qgis, but preferebly also with other
> > tools (wms's) to load data from the original raster, probably
> > accompanied with a txt file with GCP points (or maybe some other format
> > containing both gcp points and projection/transformation information)?
> > 
> > Is there some 'common' way for the the world of gis?
> > 
> > Thanks for any thoughts,
> > 
> > Richard Duivenvoorde
> 
> 
> A world file is the common way. It describes the coordinates of the
> corners, how many units per pixel and what skew if any. See the
> wikipedia page for details.
> 
> I believe the georef plugin can save the a world file for you.
> 
> Thanks,
> Alex
> 
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