New user interested in original project

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Dirkie2710
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Re: New user interested in original project

Post by Dirkie2710 »

Hi Raymond,

yes and no. The scans aren't linear like that. If you do 1 scan, there would be more points closer to the scanners location and it would thin out the further from the machine. So example if you scan a flat floor and based on a medium setting, at 3' you would maybe have 1 point every 1/20", but at 10' every 1/8" and at 30' every 1/4". With multiple scans like this we can work out an average, but at any given square yard, it may differ significantly from the average, so it really doesn't mean much.

I have had a glance and so far it looks like good detail, quality scans and properly registered. Well done to the scanning team
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Mortum
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Re: New user interested in original project

Post by Mortum »

Raymond wrote: Wed Aug 29, 2018 3:38 pm However, I am having 2nd. thoughts about "stitching" together 2 point clouds collected 5 years apart, one made with a Leica P20 and the other (hopefully soon) with a P40.
I do that all the time in Geomagic Design X (I am monitoring the movement of a church due to heat expansion and cold shrinkage), if the building didn't move (alot) there is no problem to combine the pointclouds :-)
Sincerely, Robin van der Molen

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Raymond
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Re: New user interested in original project

Post by Raymond »

I just want to report that my little project is moving along, slowly but surely.

My one-man operation continues being a one-man operation. :--(

Please watch some of my recent production:

https://www.youtube.com/watch?v=DYj5tgl ... e=youtu.be

https://www.youtube.com/watch?v=z0xIzgOSFeY

It all began here, from this point cloud:

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

Thanks to everybody!

-Ramon
JFK Numbers
Raymond
I have made 70-80 posts
I have made 70-80 posts
Posts: 71
Joined: Fri Aug 24, 2018 6:15 pm
Full Name: Ramon F Herrera
Company Details: Free Open Source3D Model of Dealey Plaza
Company Position Title: Founder - Chief Bottle Washer
Country: US
Linkedin Profile: Yes
Location: Houston, Texas
Has thanked: 8 times
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Re: New user interested in original project

Post by Raymond »

Dirkie2710 wrote: Wed Aug 29, 2018 7:23 pm Hi Raymond,

yes and no. The scans aren't linear like that. If you do 1 scan, there would be more points closer to the scanners location and it would thin out the further from the machine.
Hello, Dirkie (and everybody),

I am back, after years of dedication and accumulated experience.

See below what I just discovered. A way to objectively measure the quality of point clouds.

I am comparing two: One of them was collected for the historic 2013 PBS program. The other is its subset, it was segmented and only includes ground level.

I am using the Free (thanks!) Quick Terrain Viewer.

-Ramon
JFK Numbers
How to Measure Quality of a Point Cloud 1.jpg
How to Measure Quality of a Point Cloud 2.jpg
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Last edited by Raymond on Mon Aug 17, 2020 4:07 am, edited 1 time in total.
Raymond
I have made 70-80 posts
I have made 70-80 posts
Posts: 71
Joined: Fri Aug 24, 2018 6:15 pm
Full Name: Ramon F Herrera
Company Details: Free Open Source3D Model of Dealey Plaza
Company Position Title: Founder - Chief Bottle Washer
Country: US
Linkedin Profile: Yes
Location: Houston, Texas
Has thanked: 8 times
Contact:

Re: New user interested in original project

Post by Raymond »

This is closer:

Notice how different the 2 histograms look.
Model Information 1.jpg

Model Information 2.jpg
-Ramon
JFK Numbers
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