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

[Chris Hill]

(I'll try again ... )

It might well do that. I'll attempt to compare two areas tomorrow and 
see how easy it is get any height data out. As it happens, one of the 
areas covered by the EA data that I have worked on is a large village 
(Cottingham) which has its buildings all traced out, so I might try to 
work out some of the building heights there.

On 23/09/15 20:36, Tim Waters wrote:
> 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 <osm at 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
>>
>>
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-- 
Cheers, Chris
user: chillly