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Testing the waters with 2 GCP georeferencing (Helmert!)

blog.oldinsurancemaps.net · published 28 July 2026

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1blogs citing
First cited
10 Sept 2026
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10 Sept 2026
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danvk.org
Introducing mapsnap: Automated Georeferencing for Historic Sanborn Insurance Maps Read at the source ↗
10 Sept 2026

Links from this post

Link
Host
https://github.com/ohmg-dev/OldInsuranceMaps/discussions/403
github.com
https://github.com/ohmg-dev/OldInsuranceMaps/issues/381
github.com
https://docs.qgis.org/3.44/en/docs/user_manual/managing_data_source/georeferencer.html
docs.qgis.org
https://openstreetmap.us/get-involved/slack/
openstreetmap.us
https://gdal.org/en/stable/api/python/utilities.html
gdal.org
https://proj.org/en/stable/operations/pipeline.html
proj.org
https://proj.org/en/stable/operations/transformations/helmert.html
proj.org
https://en.wikipedia.org/wiki/Null_Island
en.wikipedia.org
https://github.com/ohmg-dev/OldInsuranceMaps/blob/85321666e0cb4aede288a5728cfa27004f32f9cc/ohmg/georeference/georeferencer.py
github.com
https://numpy.org/doc/stable/reference/generated/numpy.linalg.lstsq.html
numpy.org