Re:Whole of England to be mapped with lasers
by aglionby on Saturday December 30, 2017 @03:14PM
(#16037248)
Not sure if this is the same map you're talking about, but Ordinance Survey made a map[0] using data they had in 2013, and then again in 2014. This was based on height data at 50m resolution.
It's hard to see how OS capture height exactly, I imagine via aircraft[1]. Not sure whether they are the source of the existing data the Environment agency has; I doubt it as their data has a max resolution of 5m while the government's is 1m.
Re:Whole of England to be mapped with lasers
by 7952 on Saturday December 30, 2017 @03:23PM
(#16037316)
Most of the OS terrain data is now from pairs of aerial photos using photogrammetry. The older products were actually based on contours that were surveyed using more traditional techniques.
It's hard to see how OS capture height exactly, I imagine via aircraft[1]. Not sure whether they are the source of the existing data the Environment agency has; I doubt it as their data has a max resolution of 5m while the government's is 1m.
[0] https://www.ordnancesurvey.co.uk/innovate/developers/minecra...
[1] https://www.ordnancesurvey.co.uk/international/knowledge/dat...