[pdal] Digitized building footprints

[adam steer]

awesome. how many building footprints? been thinking about this exact thing
for a long time as a spare time project, with some datasets I've got
hanging around...

On Mon, 6 Jul 2020 at 07:56, Stephen V. Mather <svm at clevelandmetroparks.com>
wrote:

> Back to Howard’s question about the deinitition of massive: we’re looking
> at something north of 15 billion points.
>
> More as I dive into testing this week.
>
> Cheers,
> Best,
> Steve
>
> On Jul 2, 2020, at 06:09, Stephen V. Mather <svm at clevelandmetroparks.com>
> wrote:
>
> 
> Vegetation definitely shows up as a little spiked ring around the edges of
> where the buildings sit. I tend to buffer the buildings marginally anyway,
> and the remaining vegetation shows up as an unusually shaped spike that
> then the morphological filter addresses pretty well. We will see how it
> fares with CSF.
>
> (now sent with the correct email address to access the list)
>
> [image: http://sig.cmparks.net/cmp-ms-90x122.png] *Stephen V. Mather*
> GIS Manager
> (216) 635-3243 (Work)
> clevelandmetroparks.com
>
>
>
>
> ------------------------------
> *From:* Luigi Pirelli <luipir at gmail.com>
> *Sent:* Thursday, July 2, 2020 2:33 AM
> *To:* Stephen V. Mather <svm at clevelandmetroparks.com>
> *Cc:* pdal <pdal at lists.osgeo.org>
> *Subject:* Re: [pdal] Digitized building footprints
>
>
> *WARNING: This email originated outside of Cleveland Metroparks. DO NOT
> CLICK links or attachments unless you recognize the sender and know the
> content is safe.*
> hmmmm... did you check difference running MF with or without buildings?
> due to closing/opening process of the algorithm, the nearest points to
> building can be affected. In case of building, these points can be
> vegetations, especially in dry area with high thermal mass buildings (soil,
> mud, rock); vegetation grow better near this places where the water stress
> is reduced [1]
>
> Luigi Pirelli
>
> [1]
> https://www.amazon.com/dp/B07SXR66YG/ref=dp-kindle-redirect?_encoding=UTF8&btkr=1
>
>
> **************************************************************************************************
> * LinkedIn: https://www.linkedin.com/in/luigipirelli
> * Stackexchange: http://gis.stackexchange.com/users/19667/luigi-pirelli
> * GitHub: https://github.com/luipir
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> * Hire a team: http://www.qcooperative.net
>
> **************************************************************************************************
>
>
> On Mon, 29 Jun 2020 at 19:16, Stephen V. Mather <
> svm at clevelandmetroparks.com> wrote:
>
> Hi Andrew,
>
> The goal is to use the digitized footprints to filter the point cloud of
> the known buildings. With the buildings removed, I plan to then feed this
> in to SMRF to remove the vegetation points as best as possible. Something
> similar to this:
>
> https://smathermather.com/2016/10/15/finding-peace-finding-the-grounddrone-flights-for-hydrologic-modeling/
>
> Thanks,
> Best,
> Steve
>
>
> [image: http://sig.cmparks.net/cmp-ms-90x122.png] *Stephen V. Mather*
> GIS Manager
> (216) 635-3243 (Work)
> clevelandmetroparks.com
>
>
>
>
> ------------------------------
> *From:* Andrew Bell <andrew.bell.ia at gmail.com>
> *Sent:* Monday, June 29, 2020 12:43 PM
> *To:* Stephen V. Mather <svm at clevelandmetroparks.com>
> *Cc:* pdal <pdal at lists.osgeo.org>
> *Subject:* Re: [pdal] Digitized building footprints
>
>
> *WARNING: This email originated outside of Cleveland Metroparks. DO NOT
> CLICK links or attachments unless you recognize the sender and know the
> content is safe.*
>
>
> On Mon, Jun 29, 2020 at 11:25 AM Stephen V. Mather <
> svm at clevelandmetroparks.com> wrote:
>
> Hi All,
>
> I am processing a dataset for which I have a digitized building
> footprints. It'd be even cooler if I had vegetation, but beggers !=
> choosers.
>
> In principle, I could use filters.overlay, but this is a massive dataset,
> so I am curious if it makes more sense to rasterize, tile things up, and
> use filters.colorization.
>
> Happy to test and report back on what is fastest, but in case someone has
> a hunch, or an alternative recommended approach, I thought I would ask.
>
>
> It's not clear to me what you're trying to do. Maybe you could state your
> goal?
>
> --
> Andrew Bell
> andrew.bell.ia at gmail.com
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-- 
Dr. Adam Steer
http://spatialised.net
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