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LiDAR QA/QC Presentation
1.
LiDAR Calibration Errors
& QA/QC September 16th, 2009 GIS in The Rockies Presented By: Brandon Tilley © 2007, The Sanborn Map Company, Inc. Privileged and confidential information. Distribution or copying prohibited unless approved in writing. 1
2.
What is Calibration? •
Calibration varies by vendor • Four different lines collected • 3 perpendicular • 1 parallel • All used to calibrate a single mission © 2007, The Sanborn Map Company, Inc. Privileged and confidential information. Distribution or copying prohibited unless approved in writing. 2
3.
What is Calibration? •
This calibration is flown before and after the flight/mission • Flown over a flat surface • Enables user to account for the attitude of the aircraft • Yaw, pitch, and roll are primarily adjusted using opposing lines • Calibration settings apply to entire mission © 2007, The Sanborn Map Company, Inc. Privileged and confidential information. Distribution or copying prohibited unless approved in writing. 3
4.
What is Calibration?
Roll Error • Roll accounted • Pitch accounted • Settings applied throughout Corrected Roll mission strips • Similar calibration settings for each flight Pitch Error • Accurate calibration = Accurate Dataset Corrected Pitch © 2007, The Sanborn Map Company, Inc. Privileged and confidential information. Distribution or copying prohibited unless approved in writing. 4
5.
Calibration Errors Roll
Pitch • Can potentially be seen in • Can decrease the quality of the entire project building and structure by shape • Can greatly effect the • Decreases accuracy of horizontal and vertical classifications, i.e. ground and accuracy of your data building classes • Create sharp elevation shifts between each swath • Greatly reduces the accuracy of the horizontal and vertical planes • Cutting overlap usually helps with roll errors • If widespread throughout project, will create inaccurate geo- referenced data © 2007, The Sanborn Map Company, Inc. Privileged and confidential information. Distribution or copying prohibited unless approved in writing. 5
6.
Relative Accuracy -
Calibration Errors – Roll © 2007, The Sanborn Map Company, Inc. Privileged and confidential information. Distribution or copying prohibited unless approved in writing. 6
7.
Relative Accuracy -
Calibration Roll Error Corrected © 2007, The Sanborn Map Company, Inc. Privileged and confidential information. Distribution or copying prohibited unless approved in writing. 7
8.
Relative Accuracy -
Calibration Roll Error- Example 2 © 2007, The Sanborn Map Company, Inc. Privileged and confidential information. Distribution or copying prohibited unless approved in writing. 8
9.
Relative Accuracy -
Calibration Pitch Error © 2007, The Sanborn Map Company, Inc. Privileged and confidential information. Distribution or copying prohibited unless approved in writing. 9
10.
Relative Accuracy -
Calibration Pitch Error Corrected © 2007, The Sanborn Map Company, Inc. Privileged and confidential information. Distribution or copying prohibited unless approved in writing. 10
11.
Filtering •
Cutting over edge or overlap? • No? Increases chances for less accurate data (off nadir) but provides more bare earth points per sq. m. • Yes? Eliminates chances for less accurate data, less ground • Removing (classifying) outliers? • Ground filter: Does it classify too much? Not enough? • All filter steps are necessary for an accurate BE model © 2007, The Sanborn Map Company, Inc. Privileged and confidential information. Distribution or copying prohibited unless approved in writing. 11
12.
Filtering- Under Filtering ©
2007, The Sanborn Map Company, Inc. Privileged and confidential information. Distribution or copying prohibited unless approved in writing. 12
13.
Filtering- Over Filtering ©
2007, The Sanborn Map Company, Inc. Privileged and confidential information. Distribution or copying prohibited unless approved in writing. 13
14.
Filtering- Ground • Under
Filtering • Produces an inaccurate bare earth model • Within the BE surface, can be vegetation, swath noise, buildings and bridges • Increases manual QC TPT • Over Filtering • Also creates inaccurate bare earth model • Cuts off mountains, hills, and other terrain features • Increases manual QC TPT © 2007, The Sanborn Map Company, Inc. Privileged and confidential information. Distribution or copying prohibited unless approved in writing. 14
15.
Final QC Techniques •
What should your bare earth surface contain? • Structures removed • Artifacts/Vegetation removed • Noise removed • Very minimal calibration errors (if any) • Common Sense • Anything not man made © 2007, The Sanborn Map Company, Inc. Privileged and confidential information. Distribution or copying prohibited unless approved in writing. 15
16.
Artifact Removal –
Bridges/Overpasses © 2007, The Sanborn Map Company, Inc. Privileged and confidential information. Distribution or copying prohibited unless approved in writing. 16
17.
Artifact Removal –
Buildings/Structures © 2007, The Sanborn Map Company, Inc. Privileged and confidential information. Distribution or copying prohibited unless approved in writing. 17
18.
Artifact Removal –
Vegetation © 2007, The Sanborn Map Company, Inc. Privileged and confidential information. Distribution or copying prohibited unless approved in writing. 18
19.
Clients’ Specifications
Standard LIDAR 1.4m • Automated process yields 89% of Artifacts removed • Automated process yields 90% of all outliers removed • Automated process yields 90% of all vegetation removed • Automated process yields 93% of all Building removed FEMA Compliant LIDAR • Automated process yields 90% of Artifacts or as required by FEMA lead • Outliers removed per the FEMA lead provisions for a limited percentage of outliers • Automated process yields 95% of all vegetation removed and as per FEMA lead provisions • Automated process yields 98% of all Building removed and as per FEMA lead provisions High Density LIDAR 0.7m • Automated and manual processes yields 95% of Artifacts removed • Automated process yields 98% of all outliers removed • Automated process yields 97% of all vegetation removed • Automated process yields 99% of all Building removed © 2007, The Sanborn Map Company, Inc. Privileged and confidential information. Distribution or copying prohibited unless approved in writing. 19
20.
Efficiency
• Tiled datasets • Fast read/write • Multitasking • Data tracking • Easy to use tools for classifying points © 2007, The Sanborn Map Company, Inc. Privileged and confidential information. Distribution or copying prohibited unless approved in writing. 20
21.
Thank You! Graphics provided
by Leica © 2007, The Sanborn Map Company, Inc. Privileged and confidential information. Distribution or copying prohibited unless approved in writing.
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