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Problem:

I have ~100 black PNG tiles that show nothing but prairie creeks (black-creeks tiles)

I have ~100 map PNG tiles with creeks and background map (map-creeks tiles) that I can use to georeference creeks in the black tiles (the tiles themselves do not line up perfectly, thus I must line up the creeks).

I have ~100 map TIFFs with no creeks that are already georeferenced (map-no-creeks tiles) that line up with the map-creeks tiles but NOT with the black-creeks tiles.

I want to load the GCP points from the map-no-creeks tiles to georeference the map-creeks tiles

then I can use the map-creeks tiles to georeference creeks in the black-creeks tiles.

I could do this one by one using georeferencer, but is their a way to load the file paths of the map-creeks tiles and map-no-creeks GCPs as a csv and do it in a batch?

Alternativly, could I merge all the map-creeks tiles, and merge all the map-no-creeks GCPs and then georeference the two merged products?

I am on a MAC using QGIS.

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  • Do your map-no-creek tiles include *.wtf world files? Are your map-no-creek and your map-creek tiles similarly named? If so, you could use Python to create a new world file rename to *pgw for each of the png files from the wtf fils. That would automatically georeference the PNGs to the same location as the Tiffs. If the black-creek tiles share the same extents you could do the same trick for them as well.
    – GBG
    Jul 12, 2022 at 17:57
  • They do not, is there a way I can create *.wtf files for all of them at once?
    – user208690
    Jul 12, 2022 at 21:34
  • Maybe, see here: gis.stackexchange.com/questions/9421/…
    – GBG
    Jul 12, 2022 at 22:02
  • Managed to create a map-creek.tfw file from one of the map-creek.tif using Raster Translate to convert format. I do not understand how to turn the map-creek.tfw into a file that qgis can recognize and use to georeference the corresponding map-no-creek.png
    – user208690
    Jul 13, 2022 at 0:40
  • Problem solved! Used Gdal Translate to translate the map-no-creek.tifs into png and wld files which I could then rename to match the map-creek.png so qgis will automatically recognize them and assign them their proper place on the map gis.stackexchange.com/questions/398013/…
    – user208690
    Jul 13, 2022 at 0:57

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