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| GeoCommunity Mailing List |
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| Subject: | Re: [gislist] Georeferencing Software |
| Date: |
03/01/2005 08:00:02 PM |
| From: |
Runel T |
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Thank you for the clarification. We are trying to make a GIS guidebook
and we need recommendations for hardware and software requirements and
where it would come up in a GIS system and our first task is to find a
acceptable software that can georeference an image whether through
single task or more than one process or at least something to give an
image a real-world location. As for accuracy of the output, as long
it wouldn't be significant if printed in an A3 size which would have a
scale of 1:200000. For starters were looking for ArcView scripts and
freeware that can be easily installed or packaged for a Windows
machine, if any can be found otherwise we have alternative commercial
software. I'm gonna look into your g_dal tranlsate recommendation.
I've looked into Grass but think it wouldn't our target users
considering installation and and ease of use.
On Tue, 1 Mar 2005 10:01:53 -0500, Frank Warmerdam <fwarmerdam@gmail.com> wrote:
> On Tue, 1 Mar 2005 15:27:58 +0800, Runel T <rbtaningco@gmail.com> wrote:
> > Is there freeware that can be used to georeference images?
>
> Runel,
>
> I think it might be helpful if you could be more specific about your
> requirements. I am not formally trained in the geospatial field, but to
> me to "georeference images" can mean a number of processes that
> end up with an image that has an association between image locations
> and real-world locations.
>
> The simpliest case might be an already rectified image to which you
> just want to attach georeferencing information by supplying the top
> left, and bottom right corner coordinates along with a coordinate system
> definition.
>
> A more complex case might be supplying a bunch of ground control
> points on the image, and wanting to rectify the image based on them.
>
> Even more complex would be orthorectification where you want to
> correct for sensor(camera) distortion and terrain effects.
>
> There are also issues of how you want to collect your control
> information. If you already have control information in a text file
> then you just need to do the processing. But if you need an
> interactive application to help you collect control information
> (via image to image tiedown for instance) then that affects what
> would be suitable.
>
> Give a more detailed explanation of what you want, I am sure
> folks can present you a number of options.
>
> Without knowing more, some options include:
>
> o My "gdal_translate" utility can be used to associate georeferencing
> and a coordinate system with an existing rectified image. It is
> available as part of FWTools.
>
> http://fwtools.maptools.org/
>
> o GRASS includes a variety of image rectification capabilities, including
> (I think) orthorectification.
>
> http://grass.itc.it/
>
> o My "gdalwarp" utility includes the ability to do polynomial, and thin plate
> spline based rectification of images based on a set of control points.
> However, you would need to provide the control points on the command
> line. GDAL includes no nice application for collecting control points.
>
> I'm sure there are other options as well. You might want to browse
> around on http://www.freegis.org/ for a while to see some other options.
>
> Best regards,
> --
> ---------------------------------------+--------------------------------------
> I set the clouds in motion - turn up | Frank Warmerdam, warmerdam@pobox.com
> light and sound - activate the windows | http://pobox.com/~warmerdam
> and watch the world go round - Rush | Geospatial Programmer for Rent
>
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