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

[Chris Hill]

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