Guideline or standard practice for Height Control (GCP) for a Lidar Block

[Phisan Santitamnont]

Hi all,

I have to design a Lidar survey for engineering purposes 

in which accuracy is quite concern.

I have to specified number of height-control points or cluster , locations,

accuracy etc.. Lidar block are corridor and rectangle shape.

Anybody have idea if there are any guidelines or standard practice for height-control (GCP) 

for such a lidar block exists

These details are stated neither in the USGS , FEMA nor state mapping standarads.

But I found one 

http://data.auscover.org.au/xwiki/bin/view/Good+Practice+Handbook/AirborneLidarAcquisitionValidation

I would like to have some more for comparison.

Br,

[Antonio Ruiz]

Hi Phisan,

There is a paper by Helén Rost and Hamish Grierson about this topic:

http://www.fig.net/pub/fig2008/papers/ts01i/ts01i_01_rost_grierson_3047.pdf

Regards

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[Dr. Antoine Cottin]

Hi Phisan,

Assessing the accuracy of lidar data can be tricky especially the horizontal accuracy.

I would recommend this book which presents some standards on accuracy assessment for remotely sensed data:

http://www.amazon.com/Assessing-Accuracy-Remotely-Sensed-Data/dp/1420055127

Vertical assessment is fairly easy as it requires plan/horizontal surface where your can collect GPS data.

Horizontal accuracy assessment, on the other hand is much harder to get due to the discrete nature of the point cloud. There is this interesting paper presenting circular targets for the purpose. I’ve used this kind of targets for assessing the accuracy of CZMIL and this really ease the process... (of course if your data has already been collected this could be an issue):

http://info.asprs.org/publications/pers/2007journal/april/2007_apr_385-396.pdf

http://www.earthsciences.osu.edu/b4/Site/Technical%20Reports_files/Target_metadata2.pdf

Lidar data accuracy is still a hot topic, just check the ASPRS’ ILMF2014 hot sessions…

http://www.lidarmap.org/images/pdfs/ILMF%202014%20Grid%20Summary.pdf

Cheers.

Antoine

-------------------
Dr Antoine Cottin
Senior Software Developer/Analyst

Carbomap Ltd
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Edinburgh
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http://www.carbomap.com

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