Keith JenkinsIs there a way to customize the #QGIS measuring tool to report values in chains? (1 survey chain = 66 ft)
Nyall Dawson@kgjenkins no. Is there still a real use case for this, or just for play?
@nyalld This is real! I'm trying to position points based on a survey from 1790.
I did some fancy calculations based on offsets from known corner points, adjusting for the magnetic declination at the time, which worked pretty well. But now I'm finding some errors (east instead of west, etc.) in the original handwritten journals and need to manually reposition some points.
@kgjenkins ok, interesting! UK chains, right?
@nyalld This is US in 1790, which I think predates modern definitions of the international foot or US survey foot. All I know is that one chain is "66 feet"... and that the measurements tend to get off when the terrain gets rough...
Javier Jimenez Shaw@kgjenkins @nyalld
A picture of a real surveying chain
https://mapstodon.space/@jjimenezshaw/112789244780374380
A picture of a real surveying chain
https://mapstodon.space/@jjimenezshaw/112789244780374380
Javier Jimenez Shaw (@[email protected])
Attached: 2 images Surveying Chain, a.k.a. Gunter's chain, (unit of length equivalent to 22 yards) found in the rural England by a friend. https://en.wikipedia.org/wiki/Gunter's_chain