[Talk-GB] Tracing buildings under trees

Alan Mackie aamackie at gmail.com
Thu Dec 31 16:21:14 UTC 2020

If you know it's there, but don't have the information to do it asn an
outline, map it as a single node. If you think you have the information to
do it as an approximate rectangle/relevant shape then do it as a way and
leave a note.

I'd really like some software for assisted photogrammetry in these sorts of
situations, but haven't found any yet. In many cases I'd be happy to add
points/corners manually if the automated feature detection failed (you
don't need too many for an outline), but most of the projects seem entirely
focused on automated detection. Maybe someone on this list is familiar with
software that's more for assisted "photo-triangulation" rather than object

On Wed, 30 Dec 2020 at 14:43, ndrw6 <ndrw6 at redhazel.co.uk> wrote:

> Same as with poor quality imagery that was rather common until recently.
> If you are certain there is a building in there - map it, just reduce the
> level of details. A simple rectangle will do. If not - skip it. At some
> point the imagery will improve (in your case photos taken in the winter
> would help) and the building can be added/refined.
> Surveys are helpful but, as they are time consuming, I reserve them for
> PoIs and addresses rather than using them for mapping building shape
> details.
> -ndrw
> On 30 December 2020 18:49:30 GMT, Mat Attlee <mattattlee at gmail.com> wrote:
>> What approaches do people have for tracing buildings under trees? Today I
>> noticed a shelter in one of my local parks which hasn't been traced and I
>> took some photos of it but when I got home and had a look on the Bing
>> satellite images it's obscured by all the trees.
>> Now that I think about it I could just create a GPS trace walking around
>> the structure and then create its shape from that or use Vespucci and my
>> phone's GPS to determine the coordinates for the building's corners?
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