Looking for a sample point cloud

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Raymond
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Looking for a sample point cloud

Post by Raymond » Fri Nov 22, 2019 2:20 am

Hello:

Can a kind soul point to a publicly available point cloud with some streets and buildings?

This is the situation. A while back I was donated a point cloud produced by a Leica P20 laser scanner. It is here:

http://www.dealey-plaza.org/this-govern ... /pbs-nova/

It contains 36,146,767 3D colored points.

It seems to me that the quality/resolution is lower than normal. See below the building's entrance. Does it seem normal to your experienced eyes? Compare what Revit displays vs. after rendering.

TIA,

-Ramon F Herrera
JFK Numbers
[email protected]
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gordonired
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Re: Looking for a sample point cloud

Post by gordonired » Tue Nov 26, 2019 5:13 pm

I have a dataset of a few residential streets, with a 7-11 Gas station/school as well. Not sure if it's as detailed as you'd like, but I can pass it over to you if you'd like. PM me for more info.

Raymond
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Re: Looking for a sample point cloud

Post by Raymond » Fri Nov 29, 2019 11:24 am

Gordon:

That is great! Thanks so much.

-Ramon
JFK Numbers
[email protected]

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gsisman
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Re: Looking for a sample point cloud

Post by gsisman » Sun Dec 01, 2019 3:51 am

Raymond wrote:
Fri Nov 22, 2019 2:20 am
Hello:

Can a kind soul point to a publicly available point cloud with some streets and buildings?

This is the situation. A while back I was donated a point cloud produced by a Leica P20 laser scanner. It is here:

http://www.dealey-plaza.org/this-govern ... /pbs-nova/

It contains 36,146,767 3D colored points.

It seems to me that the quality/resolution is lower than normal. See below the building's entrance. Does it seem normal to your experienced eyes? Compare what Revit displays vs. after rendering.

TIA,

-Ramon F Herrera
JFK Numbers
[email protected]

From Revit.png

After Rendering LowRes.png
RAmon


Definitely looks sparse for a P20, but depends on what resolution it was scanned on and how far away the scanner was from this building

Raymond
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Re: Looking for a sample point cloud

Post by Raymond » Sun Dec 01, 2019 4:42 pm

Ramon
Definitely looks sparse for a P20, but depends on what resolution it was scanned on and how far away the scanner was from this building
Your expert and kind assistance is much appreciated, Steve. Please watch the relevant part from the 2013 PBS Nova program below. This was supposed to be a big breakthrough. In fact, to this day what you see there is the last word, what America and the world know about this tragic, unresolved according to most case:

https://www.youtube.com/watch?v=8XWW2G3rSWM

I had those files reviewed by a competitor of Leica Geosystems and they told me something similar: That point cloud is rather poor.

Thanks!

-Ramon
JFK Numbers
Last edited by Raymond on Sun Dec 01, 2019 5:11 pm, edited 1 time in total.

Raymond
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Re: Looking for a sample point cloud

Post by Raymond » Sun Dec 01, 2019 4:57 pm

gsisman wrote:
Sun Dec 01, 2019 3:51 am
Ramon
Definitely looks sparse for a P20, but depends on what resolution it was scanned on and how far away the scanner was from this building
See below what was shown to the PBS viewers vs. what I was given.

-Ramon
JFK Numbers

ps: People have risked and lost their jobs to make sure that the only open source project in the history of this case, since 1964 has those measurements. The person from PBS who made sure that I got the laser scanning files, Lauren Miller, was fired, as well as another who helped me, the PBS Public Editor, Madhulika Sikka.
Shown to PBS Viewers 1.png
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