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Editing/updating a raster using opensource solution

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#1
Covasnianu Adrian

Covasnianu Adrian

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Hi!

I'm trying to update a raster file (tiff format) representing an old topographical map from 1975.

I've used Arcscan during evaluation period upon ArcView, but it expired now.

I want to use another software (open-source solution preferable) in order to update and edit a raster with tools similar to ArcScan (erase, brush, magic brush) .

Sincerely,
geogr. Adrian Covasnianu
GIS user

PhD geographer
CUGUAT-TIGRIS Research Center
University Al.I.Cuza Iaşi
Faculty of Geography & Geology

email: covasnianu.adrian@gmail.com

#2
johnnyh

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Hm... have you tried Gimp?

Years ago, I figured out how to edit rasters in photo editors without altering the coordinate metadata... Can't remember the details, but I know it can be done. I'll try to remember, maybe I have some old notes around somewhere.

If nothing else, you can edit in Gimp and then re-rectify the image after you are done editing.

#3
François Goulet

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If you have a world file with your tif, you can modify the image in Photoshop, Gimp, ... as long as you delete the pyramids before reloading it in Arc (I suppose you have Arc since you used ArcScan).

The world file (.tfw) contains the georeferencing data needed to display the raster correctly.

#4
Nick H

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You could make a world file for your GEOTIFF using gdal_translate, with a command line like this:

gdal_translate -co tfw=yes inputfilename.tif outputfilename.tif

Then you could edit the TIF as much as you like in any graphics software, as long as you don't resize the image.

Regards, N.
Caversham, Reading, England.




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