Could subtracting between the DSM and DTM where we have buildings already in OSM give the height of the buildings?
On 23 September 2015 at 15:08, Chris Hill <o...@raggedred.net> wrote: > On 23/09/15 14:18, Phil Endecott wrote: >> >> Has anyone reviewed how useful this LIDAR data would be for 3D city >> mapping? >> >> Chris Hill wrote: >>> >>> The slippy map with relief tiles made from the data and optionally >>> contours also made from the data is here: http://relief.raggedred.net. >> >> >> Thanks Chris. I've just been looking at Hull city centre. It doesn't >> look great; is this the difference between the "terrain model" and the >> "surface model" that they mention? Which are you using? Have you looked >> at the other one? > > > It looks pretty realistic to me, I guess you mean it doesn't show building > outlines, but that's why I chose the DTM version. >> >> >> Of course I know that the rationale for the data is for flood risk >> evaluation so recording building profiles was not the objective - but >> you never know how something could be re-purposed! >> > > In the blog article > (http://chris-osm.blogspot.co.uk/2015/09/more-lidar-goodness.html) I explain > a bit about the difference between DSM and DTM. DSM does include building > outlines. I've processed a small part of the data to see them. Here's an > example of a TIFF of DSM data with the building outlines: > http://raggedred.net/shared/ta0230.tif > > Suitably processed this could provide a source of building outlines. > > I'm not sure about the age of some of the data. Some recently-built flood > alleviation measures do not show on this EA data but do show on the Bing > aerial imagery > > -- > Cheers, Chris > user: chillly > > > _______________________________________________ > Talk-GB mailing list > Talk-GB@openstreetmap.org > https://lists.openstreetmap.org/listinfo/talk-gb _______________________________________________ Talk-GB mailing list Talk-GB@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-gb
