[Talk-GB] Environment Agency LIDAR datasets OGL licensed now available

[SK53]

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area of managed retreat and OSM is somewhat out-of-date, although it has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 <osm at 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 <chippy2005 at 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
>>>
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>
>
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