Timeline for Georeferencing a historic map to a local custom coordinate system
Current License: CC BY-SA 4.0
8 events
| when toggle format | what | by | license | comment | |
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| Apr 13, 2021 at 8:31 | vote | accept | Fiet Kleiner | ||
| Apr 9, 2021 at 20:16 | comment | added | Gabriel De Luca | So you have the raster data georeferenced in UTM? You can reproject it via gdalwarp, outside from QGIS. But since the relation between UTM 35N and the local grid system is linear, just don't say the georeferencer that it is a derived CRS, georeference as if it is any standarized CRS and then overwrite it. In any case, better if operations with the derived CRS are done outside QGIS, you can use QGIS to see all data together but not much more yet. | |
| Apr 9, 2021 at 8:22 | comment | added | Fiet Kleiner | I forgot to mention that the project is in (EPSG 32635) UTM35. Only some layers are in the derived affine system. But this doesn't work. If I click Raster->Projection->Transform and try to transform from utm to local, the is an error message; and if I simply change the raster layer ccs from utm to local, the map is shown in the slightly wrong place. | |
| Apr 9, 2021 at 6:18 | comment | added | Gabriel De Luca | What happens if you temporarily overwrite the CRS of the map (of both the layers instances inside the project and the project itself), saying that it is made in UTM zone 35N instead of its 2D affine derived CRS? I think that you will be able to warp the historic map to UTM, and then just inversely overwrite its CRS to say that it is not in UTM but in its 2D affine derived one. | |
| Apr 8, 2021 at 15:33 | history | edited | Vince | CC BY-SA 4.0 |
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| Apr 8, 2021 at 14:55 | history | edited | Ian Turton | CC BY-SA 4.0 |
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| Apr 8, 2021 at 14:46 | answer | added | wingnut | timeline score: 1 | |
| Apr 8, 2021 at 14:23 | history | asked | Fiet Kleiner | CC BY-SA 4.0 |