Is there no error message associated with the crash? This sounds like the
'silent' crash issue that sometimes happens on Windows machines, something to
do with the Windows configuration, which can change. We haven't seen this
happen on Mac OS or Linux to date, or you might try a different Windows
computer with Windows 7. Another workaround is to split the tile up into
smaller pieces, but it sounds like you've tried that, although I can't tell
from your email if this is the only LAS file you've had problems with. I
suspect the extreme point density of 30pts/m2 has increased the probability of
this occurring. Is this terrestrial lidar?
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Anonymous
-
2011-08-31
Thanks for the quick response!
The message is the standard Windows application error dialog . . . "mcc-
lidar.exe has encountered a problem and needs to close. We are sorry for
the inconvenience."
I have tried several different machines (XP-32bit, XP-64bit, Windows7),
several different LAS files of various sizes, all result with the same error
being generated.
All my test data was captured with an aerial sensor (helicopter).
I didn't see anything in the docs pertaining to sensor type or point density.
Is the point density an important factor? I really would like to use the full
data set.
I will thin the data and try again.
Is there a maximum or recommended point density?
Thanks for your assistance.
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
To my knowledge, this is the first time someone's tried to use MCC on lidar
collected from a helicopter. It's extremely dense data, but I'm still
optimistic because others have used it on terrestrial lidar which is at least
as dense. Although a difference may be that the helicopter pulses may be much
larger than from a ground lidar. What is the footprint size? Try dramatically
reducing one or both parameters, especially the scale parameter, say to 0.2.
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Anonymous
-
2011-09-08
Sorry for not responding sooner.
I think I have found a solution to the problem.
There was some previously classified data in the LAS file.
After reclassifying this data back to 'DEFAULT' , MCC works as expected.
Your time and help has been appreciated.
Thanks
Mark
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Hello!
I am having a similar issue with a ground-based LiDAR dataset. We are interested in removing grass from our scans so that we can have a true bare surface model of the ground.
First we received an error message: insufficient memory; if applicable, use a larger post spacing.(Our s = 0.03 t= 0.01) I am using a computer with plenty of memory so I found that troubling. So I bumped the parameters up to s = 3, t=1 and the program crashed after it got to "Sorting points into regions..." I've attached JPEGs of the command prompt. Has any one had the same issue? Has anyone used MCC-LiDAR to "mow grass" from groun based LiDAR?
Thank you!
MCC
Version: 1.0 (revision 187)
OS: WinXP 32bit
Command Line: mcc-lidar
-s 1.5 -t 1.5 0089.las _0089.las
LiDAR post-spacing: 30pts/m²
Reported
Error: Reading 211,004 points from '0089.las' …
min X Y : 2068703.35 1296006.99
max X Y : 2068999.99 1296999.99
Searching for points with the same x,y coordinates…
61,164 points classified as non-
ground
Identified 7,639 sets of unclassified duplicate points
Scale domain: 1 (cell resolution: 0.04)
SD 1 - Pass 1
Interpolating 112,997 points:
Sorting points into regions…
Greetings,
Crashes regardless of number of points in LAS file (100k - 30M) or command
line parameters used.
What am I doing wrong?
Thanks
Is there no error message associated with the crash? This sounds like the
'silent' crash issue that sometimes happens on Windows machines, something to
do with the Windows configuration, which can change. We haven't seen this
happen on Mac OS or Linux to date, or you might try a different Windows
computer with Windows 7. Another workaround is to split the tile up into
smaller pieces, but it sounds like you've tried that, although I can't tell
from your email if this is the only LAS file you've had problems with. I
suspect the extreme point density of 30pts/m2 has increased the probability of
this occurring. Is this terrestrial lidar?
Thanks for the quick response!
The message is the standard Windows application error dialog . . . "mcc-
lidar.exe has encountered a problem and needs to close. We are sorry for
the inconvenience."
I have tried several different machines (XP-32bit, XP-64bit, Windows7),
several different LAS files of various sizes, all result with the same error
being generated.
All my test data was captured with an aerial sensor (helicopter).
I didn't see anything in the docs pertaining to sensor type or point density.
Is the point density an important factor? I really would like to use the full
data set.
I will thin the data and try again.
Is there a maximum or recommended point density?
Thanks for your assistance.
To my knowledge, this is the first time someone's tried to use MCC on lidar
collected from a helicopter. It's extremely dense data, but I'm still
optimistic because others have used it on terrestrial lidar which is at least
as dense. Although a difference may be that the helicopter pulses may be much
larger than from a ground lidar. What is the footprint size? Try dramatically
reducing one or both parameters, especially the scale parameter, say to 0.2.
Sorry for not responding sooner.
I think I have found a solution to the problem.
There was some previously classified data in the LAS file.
After reclassifying this data back to 'DEFAULT' , MCC works as expected.
Your time and help has been appreciated.
Thanks
Mark
Hello!
I am having a similar issue with a ground-based LiDAR dataset. We are interested in removing grass from our scans so that we can have a true bare surface model of the ground.
First we received an error message: insufficient memory; if applicable, use a larger post spacing.(Our s = 0.03 t= 0.01) I am using a computer with plenty of memory so I found that troubling. So I bumped the parameters up to s = 3, t=1 and the program crashed after it got to "Sorting points into regions..." I've attached JPEGs of the command prompt. Has any one had the same issue? Has anyone used MCC-LiDAR to "mow grass" from groun based LiDAR?
Thank you!