I've had a look at the LIDAR data for Attenborough NR and also the RSBP Medmerry reserve (in the Hundred of Manhood near Selsey). I havent had a full play but so far it hasnt picked up a small elevation difference which affects the hydrology of Attenborough (thanks to Sandy Aitken, Volunteer Reserve Manager for detailed analysis to find this out). See https://www.dropbox.com/s/z1qhmc1997kt9it/anr_terrain_contours_1m.png?dl=0.
Medmerry is rather more dramatic. I looked at this because of a twitter discussion with Liz Scott (@birdmaps) & Amy Robjohns (@amyrobjohsn) https://twitter.com/amythebirder/status/639688917625761792 . Medmerry is an area of managed retreat and OSM is somewhat out-of-date, although it has been partially surveyed. The Lidar data is more recent than any aerial photos or OS StreetView (and I think VMD etc.) and in particular shows new sea defences just S of the newly created gap. I havent processed this data yet in such a way to really highlight the differences in the RSBP area. I did notice that off Selsey there is a lot of clutter just off-shore (I think this shoreline is rightly celebrated by wind surfers, so not a total surprise. I havent tried to do any edits here because I wanted to leave it in case Liz & Amy had time to tackle it at Southampton MapTime. I do plan to blog about this, but, usual, will take some time to do so, as I will include it in a general post on mapping nature reserves. Jerry On 22 September 2015 at 11:03, Chris Hill <o...@raggedred.net> wrote: > Thanks for the plug Tim :-) > > The slippy map with relief tiles made from the data and optionally > contours also made from the data is here: http://relief.raggedred.net. > This covers a mostly very flat area, yet significant details are visible. > It does show a number of places where ditches and other small water courses > might be missing from OSM and therefore places to survey. > > The contours are minutely detailed using the 50cm data. If I was creating > contours that are more generally useful I'd try the 2m data I think. > > -- > Cheers, Chris > user: chillly > > > > On 22/09/15 10:39, Tim Waters wrote: > >> Ahh correction, there *is* data at 25cm and 50cm in some areas (where >> flooding is a threat) but it looks as if the 1m and 2m covers the >> country. >> >> Chris has written a post here also: >> http://chris-osm.blogspot.co.uk/2015/09/more-lidar-goodness.html so >> we're already playing with it. >> >> Tim >> >> On 22 September 2015 at 10:34, Tim Waters <chippy2...@gmail.com> wrote: >> >>> Hello, >>> >>> back in June we had a thread announcing that this LIDAR data was due >>> to be released. Well some of it has. >>> >>> >>> https://environmentagency.blog.gov.uk/2015/09/18/laser-surveys-light-up-open-data/ >>> >>> http://environment.data.gov.uk/ds/survey#/ >>> >>> I think it's just for England, and appears to be 1m and 2m composite >>> DTM and 1m and 2m DSM They do intend to release a Tiled version next, >>> and I think 50cm and 25cm are coming also >>> >>> What can we do with it? >>> >>> Cheers, >>> >>> Tim >>> >> _______________________________________________ >> 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 >
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