Just off the top of my head Erdas has/had a tool called objective that
would outline building rooftops...possibly in 3-d -
http://www.hexagongeospatial.com/products/ERDAS-IMAGINE/IMAGINEObjective/Details.aspx
There are several packages from ERDAS/Intergraph/Boeing/etc that do this
type of thing - although I've been out of the industry too long to know
if it's down to "automatic" (button push).
As for free geospatial data - that is doubtful. You are probably going
to have to draw up plans and have data collected to support this endeavor.
To map a US Based Fossil Plant (burning coal to produce electricity)
would cost 10 years ago about ~$100,000 and that gave you contours,
building heights, coal inventory, planimetrics, etc. Now I'm assuming a
large portion of that would be done with lidar and not require massive
numbers of stero pairs etc (only reason I know is I had to have one done
for a former employer).
Hope that helps - the software exists - I don't think it exists in the
Open Source world currently.
Randy
On 08/03/2014 06:05 PM, Bruce Bannerman wrote:
Sid,
A search on the term photogrammetry may also help. This is a very specialised
discipline.
You will find that some photogrammetric software already exists.
Bruce
________________________________________
From: [email protected] [[email protected]] On
Behalf Of Pat Tressel [[email protected]]
Sent: Saturday, 2 August 2014 4:34 PM
To: S.A. Mouti
Cc: OSGeo Discussions
Subject: Re: [OSGeo-Discuss] Inquiry: Help please!
Hi, Sid!
I would like to develop an algorithm that uses remote geographic sensing data
to automatically identify, highlight, and measure rooftops and buildings
surfaces and contours using Geospatial data. My preference is to overlay the
results on one of the existing map providers such as Google Earth/maps or Bing
.
My aim is to get the following outputs from the proposed model:
* Accurately highlighted and identified rooftops on Google maps (using geo
sensing data, elevation? and
* Property Address or GPS coordinate.
* Surface and square footage available for solar power generation including
the position of the property(N-S or E-W). At the exact surface of the south
facing portion of the roof.
* Integrate sun tool in google maps to calculate shading for each building.
* Total surface/square footage of the roof.
I would appreciate your guidance on the following:
* Any individual developers or companies active in this area who would be
willing to undertake this challenge
* View on technical do-ability of the project…
* What free geospatial data is available/needed to build the model and who
the providers are? (I understand that US cleared higher resolution imagery for
domestic )
* An idea about the overall cost for such a model.
Best regards,
Sid
Just want to mention two things:
1) Building outlines are available for some locations in both commercial maps (Google and
Bing, for instance). In OpenStreetMap, if buildings have not been mapped for a specific
area you're interested in, you might be able to get local mappers to do it. (Of course,
the building outlines obtained that way may not be accurate. Many times, the building
outline is simplified from the actual building as it's only needed to indicate,
"there is / was a building here", e.g. for rescue workers looking for survivors
after a natural disaster.)
2) If you use satellite imagery (or possibly low-elevation imagery if you have
accurate info on the camera path and orientation), then the shadows cast by
buildings can be used to estimate their height. A very brief web search turns
up a fair number of papers on this -- just one example, with references to
earlier work that may be more relevant:
http://www.asprs.org/a/publications/pers/98journal/january/1998_jan_35-44.pdf
-- Pat
_______________________________________________
Discuss mailing list
[email protected]
http://lists.osgeo.org/mailman/listinfo/discuss
--
-----------------
Randal Hale
North River Geographic Systems, Inc
http://www.northrivergeographic.com
423.653.3611 [email protected]
twitter:rjhale http://about.me/rjhale
http://www.northrivergeographic.com/spatial-connect
_______________________________________________
Discuss mailing list
[email protected]
http://lists.osgeo.org/mailman/listinfo/discuss
