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I have created a map from a picture. And now I have some more detailed pictures and georeferenced them. Is there any way to quickly access them later on.

I mean everything is fine with georeferencing. The picture is projected right where it shall be at the end. But I would like to know if there is a way to add some reference points or even delete some.

I know I could delete the picture and load the raster again and start from a new georeferencing.

So is there a possibility to edit georeferenced pictures?

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  • Does some one know how to re-georeference a tif ? I want to readjust some picture. Thank you all
    – S Cicese
    Commented Mar 24, 2017 at 12:59
  • Sorry but thats no answer.
    – kwoxer
    Commented Mar 24, 2017 at 13:11
  • This does not really answer the question. If you have a different question, you can ask it by clicking Ask Question. You can also add a bounty to draw more attention to this question once you have enough reputation. - From Review
    – mgri
    Commented Mar 24, 2017 at 13:33

2 Answers 2

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If you know that you can refine the GCP later, write the georeferencing result to a vrt file using the GDAL batch conmmandline export.

You can edit that later with any text editor, and add additional GCP's.

Re-georeferencing a tif is more complicated, because the first round you georeference ageianst pixel coordinates, while the second run uses the coordinates of the defined CRS. At least with the QGIS georeferencer.

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  • Well that would a solution, but I think I'm then faster when I just do the whole thing again. Anyway thanks for the workaround and explainations.
    – kwoxer
    Commented Feb 3, 2015 at 14:13
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Unsure if this helps, but I had an issue with georeferencing satellite images on top of basemaps. The images were not taken from a true vertical position, and as such they could not be georeferenced perfectly. I used the Plugin "Freehand raster georeferencer" which enabled me to massively improve the accuracy on many occasions.

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