[TCMUG] Building heights Minneapolis/ St. Paul?

[Loesch, Tim N (MNIT)]

Folks,

My experience is that It’s a bit problematic to bring out the heights of building because there are no associated building footprints that can be used to segment out the different buildings. As it stands buildings that are connected together and have different heights are coalesced into a single building. A compounding factor in Minneapolis and St. Paul is that the skyway system, which ties buildings together across streets, ends up connecting buildings all over the place.  If you had had a small set of buildings you were interested in it would be easy enough to slap down a couple of polygons but from an en mass perspective it’s tough.

I did see some ESRI tools at the GIS/LIS conference that seemed to be able to handle this situation and separate out buildings of different heights that were adjacent to one another but I don’t know the details on how that was done.

Tim

Timothy N. Loesch
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From: Tcmug <tcmug-bounces at lists.osgeo.org> On Behalf Of Peter Wiringa
Sent: Friday, November 2, 2018 9:18 AM
To: TCMUG <tcmug at lists.osgeo.org>
Subject: Re: [TCMUG] Building heights Minneapolis/ St. Paul?

If you're only concerned with taller structures that wouldn't have any canopy above you might be able to skip LiDAR processing and use DEM from MnTOPO and DSM from here<https://conservancy.umn.edu/handle/11299/172696> to get an nDSM, then use the footprints as Dan suggests.

On Fri, Nov 2, 2018 at 9:15 AM James Klassen <klassen.js at gmail.com<mailto:klassen.js at gmail.com>> wrote:
Depending on what you are using it for does leave a lot of questions about what height you need.

Average/max, height? Height above ground or above datum?  What is a building (sheds?, big multi part buildings like hospitals?).

St. Paul and presumably Minneapolis have a building footprint dataset.

The more recent Lidar data also typically has the building points classified in the point clouds.


On Fri, Nov 2, 2018, 09:09 Dan Little <theduckylittle at gmail.com<mailto:theduckylittle at gmail.com> wrote:
Could you join the MSFT foot print dataset with the lidar data to get an average height per building?

On Fri, Nov 2, 2018 at 9:07 AM James Klassen <klassen.js at gmail.com<mailto:klassen.js at gmail.com>> wrote:
I don't know if there is a database with a single number per building, but the information can be extracted from the various Lidar datasets (with the caveat that they are getting somewhat dated and in one of the collects they clipped off the tops of the buildings in downtown Minneapolis.)

On Nov 1, 2018 20:36, "Jennifer Strahan" <strahanjen at gmail.com<mailto:strahanjen at gmail.com>> wrote:
Hello,

Hope all of you are well!

I'm looking for building heights data for Minneapolis/ St. Paul, ideally Hennepin and Ramsey Counties.  Does this exist?

Thanks,
Jennifer
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--
Peter Wiringa
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University of Minnesota | umn.edu<http://umn.edu/>
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