Search found 35 matches

by Adam
Thu Jun 06, 2019 12:36 am
Forum: Questions
Topic: scanner accuracy
Replies: 3
Views: 2238

Re: scanner accuracy

Also, does vertical displacement has anything to do with erosion or deposition? I just don't know what to do with the value I get from the M3C2 (mean and standard deviation) I don't know what they mean in terms of the change rate

thanks
by Adam
Thu Jun 06, 2019 12:17 am
Forum: Questions
Topic: scanner accuracy
Replies: 3
Views: 2238

Re: scanner accuracy

Thanks for your reply. I have fixed the normal in the vertical direction. Does this mean vertical displacement and also can be called different in surface heights between two point clouds?
So this has nothing to do with the scanner accuracy? and if distance uncertainties are 0.01 mm

Thanks
by Adam
Thu May 30, 2019 11:47 pm
Forum: Questions
Topic: scanner accuracy
Replies: 3
Views: 2238

scanner accuracy

Hello, My scanner accuracy is ±0.13 mm. Does this affect the results of M3C2 distances? for examples, if the mean from M3C2 is 0.0002 mm and std is 0.0331 mm or -0.0003 mm and std is 0.0383 mm or 0.003 mm and std is 0.042 mm. Note all the averages of distances uncertainties are approx. 0.01 mm. How ...
by Adam
Fri Apr 19, 2019 6:20 pm
Forum: Questions
Topic: Measuring distance between 2 point clouds
Replies: 2
Views: 3939

Re: Measuring distance between 2 point clouds

Hi, I would like to know the distance values. For example, I would like to write it like this> ''the map of surface change shows a very large range of detected absolute changes from 6 mm to 6.96 m' Dimitri Lague, 2013 So what is this number in my case? I'm looking at the height difference between th...
by Adam
Fri Apr 19, 2019 9:49 am
Forum: Questions
Topic: Measuring distance between 2 point clouds
Replies: 2
Views: 3939

Measuring distance between 2 point clouds

Hello, I'm having difficulties to measure the distance between 2 point clouds. Here I have used vertical distance. I want to be able to tell this is the vertical distance (height difference ) between them. Can you please look at the attached images and help me to figure out what is the average dista...
by Adam
Wed Apr 17, 2019 11:21 pm
Forum: Questions
Topic: M3C2 mean and standard deviation
Replies: 2
Views: 2219

Re: M3C2 mean and standard deviation

Thanks for your reply :) Is the mean in the histogram of M3C2 considered as the ''average distance'' or mean distance between the two clouds? and what is the standard deviation represent? what are ''significant change'' and ''distance uncertainties'' from M3C2 outputs? is significant change mean the...
by Adam
Wed Apr 17, 2019 8:38 am
Forum: Questions
Topic: M3C2 mean and standard deviation
Replies: 2
Views: 2219

M3C2 mean and standard deviation

Hi :) Is the mean in the histogram of M3C2 considered as the ''average distance'' or mean distance between the two clouds? and what is the standard deviation represent? I have tried C2C absolute distance to check and I have the same standard deviations but very different means. Mean from M3C2 is 0.0...
by Adam
Sat Apr 06, 2019 10:36 am
Forum: Questions
Topic: Differences in height for 2 point clouds from laser scanner
Replies: 8
Views: 5199

Re: Differences in height for 2 point clouds from laser scanner

Thanks But how to do the same for each mesh? like histogram to be able to say this is the mean/std as it shows in the histogram for M3C2? what are the important data to include from the M3C2 distance computation? I have used STD_cloud 1& 2 for the local roughness only Npoints_cloud1 Npoints_clou...
by Adam
Sat Apr 06, 2019 9:13 am
Forum: Questions
Topic: Differences in height for 2 point clouds from laser scanner
Replies: 8
Views: 5199

Re: Differences in height for 2 point clouds from laser scanner

Hi, thanks for your reply. I kind of understand now that I should not take the averages of the height of mesh 1 and 2, and compare them to M3C2 distances because of noises. So I will remove the averages of z values, but I want to know the difference in heights between the 2 meshes in numbers. For ex...
by Adam
Fri Apr 05, 2019 6:56 pm
Forum: Questions
Topic: Differences in height for 2 point clouds from laser scanner
Replies: 8
Views: 5199

Re: Differences in height for 2 point clouds from laser scanner

I mean if I take the averages of M3C2 distance that generated from M3C2 computation like the value below is this the difference in heights? M3C2_distance -0.025911 0.036401 0.004997 -0.020805 0.043254 0.04156 0.042982 0.003481 -0.055137 -0.053322 -0.063224 -0.040197 0.009203 -0.016254 0.024587 0.033...