processing bathymetric data -...
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ProcessingBathymetric Data
Mikko Ojala
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Data courtesy of FTA and Meritaito Ltd
● Examples generated from data provided byFinnish Transport Agency andMeritaito Ltd
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Bathymetric data
● Bathymetric data can be regarded more sensitive than topographic data
1) Results are harder to verify
2) Coastal areas can have military interest
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Processing Bathymetric LiDAR data
● Common practises can be adapted from topographic LiDAR processing
➢ For example low point search and ground classification routines
➢ With a combination of classification routines a good automatic result can be achieved
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Processing Bathymetric LiDAR data
● Automatic vs. manual classification
➢ Automatic classification routines can speed up production but consideration has to be put into the excecution due to the nature of the data
➢ Underwater objects vs. visible objects on land→ no room for error
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Processing Bathymetric LiDAR data
● Example of automated water surface noise classification
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Processing Bathymetric LiDAR data
● Example of automated sea bottom classification
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Processing MBES (sonar) data
● Again some practises can be adapted from topographic (and bathymetric) LiDAR processing
● Deep water vs. shallow water mapping
➢ Deep water datasets can have much less noise when compared to shallow water datasets
➢ Reasons for this can be e.g. water turbidity and bottom material in shallow areas
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Processing MBES (sonar) data
● Deep water automatic MBES data processing:
➢ Most of the data can be regarded as valid sea bottom
→ Classification can focus mainly in finding false echoes and noise points
→ Examples of errors found in MBES data:
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Processing MBES (sonar) data
● Deep water automatic MBES data processing:
➢ It's possible to find a general routine that can be applied to different datasets by adjusting the parameters
➢ Improvement in processing speed of the data can be significant
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Processing MBES (sonar) data
● Shallow water automatic MBES data processing:
➢ Data can be very noisy which makes automatic data processing difficult
→ Even for a human it can be difficult to distinguish features from these datasets
→ Computer algorithms can help in making sense of the data
→ Improving automatic classification result requires more development
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Combining LiDAR and MBES data
● LiDAR
➢ more cost efficient than MBES in shallow areas
➢ able to reach areas where no ship could enter
● MBES ➢ able to reach depths that LiDAR couldn't
➢ less dependent on environmental factors
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Combining LiDAR and MBES data
● Complex areas with LiDAR, rest with MBES
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Combining LiDAR and MBES data
● Important use case of bathymetric LiDAR
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Combining LiDAR and MBES data
● Example of DTM created of MBES and LiDAR data
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Combining LiDAR and MBES data
● Example of DTM created of LiDAR data
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Combining LiDAR and MBES data
● Example of DTM created of MBES and LiDAR data
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TerrasolidKanavanranta 7 B 28 00160 HelsinkiFinlandwww.terrasolid.com
Mikko OjalaTechnical Support Engineer