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The Considerations of New LiDAR Sensor Technology

IGIC: February, 2010

Presented by: Jamie Young: Director of Operations

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Disclaimer

• The new LiDAR technology is exceptional• The data is better than ever• All technology has some hiccups • All the issue in this presentation are

correctable • Accuracy is awesome!!!• This is why we have support contracts when

we can’t fix it• Same make and model are not exactly alike!• I don’t know everything so speak up

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LiDAR Sensors

• Optech and Leica are detailed but will not be singled out– Optech 3100– Optech Gemini– ALS 50-II– ALS 50 MPia

• Both Optech and Leica have been working on Improved system

• There are definite improvements with the technologies

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Calibration

• Calibration of systems continues to be a difficult• Some systems hold calibration better than others• Stabilized and shock-mounted systems yield smoother

data• Intensity seems to cause the biggest issues• Speed of Laser causes pitch errors to be more

predominate.• Heading continues not to be an issue• Range correction as a result of intensity continue to

plague us.• Most all sensor errors can be fixed in calibration• And they are very complex

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Reflectivity

• The texture of roofs sometimes affects representation of the building top.

• One Building is right on and the next door building is slightly off

• Dropouts on tarred roofs• Dropouts on freshly paved roads and freshly

tarred parking lots• Make sure that sensors are set correctly• Saturation areas can cause incorrect ranges

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Reflectivity - Causes

• Incorrect settings

• Incorrect flying heights for settings

• Intensity tables not correct

• Problems with the Hardware?

• Present in all system types?

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What is wrong with this picture?

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What is wrong with this one?

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Intensity VS. Range

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Intensity VS. Swap and Water

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Intensity Again?

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Operator ErrorOops I’m in multi-pulse!

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WOW!!!

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Signs of my intensity table

This rarely happened with the old systems

But WE have Support!!!

It did not affect the range though

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Corn rowing

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New Sensor Technology

• When Sensors are working correctly– Much better data– Improved Accuracy

• Both horizontally and vertically

– More efficient collection– Manufacture’s continue to improve systems – Manufactures Listen to users and work hard to make their

systems better– Variability of system help us apply new applications– Cost less to operate– Market demands new technology but can you slow down so

we can get the best data from what we have?– Can I have a system that does everything?

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Airborne systems

This is based on 1000m meters and above

Vertical accuracy required usually 9.24 -18 cmHorizontal accuracy required usually 50 cm – 1.0m

Before MPia, ALS-60, and GEMINIVertical accuracy achieved: 5.8 -12 cm Horizontal accuracy achieved: 14 -27 cm

After MPia, ALS-60 and GEMINIVertical accuracy achieved: 3 – 12 cmHorizontal accuracy achieved: 10 – 27 cm

Sometimes better than this..!!!!!!!

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Baselines – You’re killing me

Better technologyMore satellites

We get better results

at 40 to 50KM

Can we Change this

Requirement. Please!

It’s more efficient

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Intensity

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Data detail

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Products from LiDAR

Line work from LiDAR and intensityContours from LiDAR

Intensity image

Image from co-registered CameraClassified LAS

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Detail

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Hydro Breakline Collection Process (LiDARgrammetry)

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Data1.4 meter collection

DSM- Digital Surface Model

Intensity Image

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LiDAR BLOGSubmit any question about LiDAR

http://lidarblog.wordpress.com

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Thank you! And Questions!

Graphics provided by Leica