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OldInsuranceMaps

@oldinsurancemaps.net

A public space for georeferencing (and exploring) historical fire insurance atlases ~ oldinsurancemaps.net ~ app development on GitHub: github.com/ohmg-dev/OldInsuranceMaps

Posts Replies Media

OldInsuranceMaps @oldinsurancemaps.net · 8h

Introducing user-triggered mosaic generation: blog.oldinsurancemaps.net/2026/10/0…

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OldInsuranceMaps @oldinsurancemaps.net · 25/08/2026

Joining the OSM US Charter Project program: blog.oldinsurancemaps.net/2026/08/2…

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OldInsuranceMaps @oldinsurancemaps.net · 28/07/2026

Testing the waters with 2 GCP georeferencing (Helmert!): blog.oldinsurancemaps.net/2026/07/2…

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OldInsuranceMaps @oldinsurancemaps.net · 31/05/2026

Recap: May Georeference-a-thons in New Orleans: blog.oldinsurancemaps.net/2026/05/1…

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OldInsuranceMaps @oldinsurancemaps.net · 30/04/2026

Georeference-a-thons! HistoryForge (New Orleans), UMD, and UIUC: blog.oldinsurancemaps.net/2026/04/3…

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OldInsuranceMaps @oldinsurancemaps.net · 02/12/2025

in brief: with multi-page georeference atlases, you need to trim the margins of overlapping sheets, and OldInsuranceMaps.net has a really nice way of doing it. Complete with snapping and (now) vertex styles that make it easy to clean things up

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OldInsuranceMaps @oldinsurancemaps.net · 06/10/2025

From some recent activity, here's a rare but good example (from Worcester Mass.) of where the Thin Plate Spline transformation makes sense for #georeferencing #sanborn maps. Curved roads out in space are sometimes drawn without good scale and need extra distortion oldinsurancemaps.net/layer/72727

A georeferenced Sanborn map sheet that shows significant distortion (Worcester, Mass., 1950, Vol. 3, p 343 (partial). The map has a few blocks but is distorted near the area of a curved road on the east side of the page.

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