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U.S. Geological Survey

U.S. Geological Survey. ASPRS LiDAR Calibration and QA telecon results ASPRS, 4 May 2011. Greg Stensaas Remote Sensing Technologies Project Manager Data Management Branch USGS/EROS Center Sioux Falls, SD. Background.

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U.S. Geological Survey

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  1. U.S. Geological Survey ASPRS LiDAR Calibration and QA telecon results ASPRS, 4 May 2011 Greg Stensaas Remote Sensing Technologies Project Manager Data Management Branch USGS/EROS Center Sioux Falls, SD

  2. Background Currently, the LiDAR system calibration is defined by a handful of parameters. There is an ongoing effort to consistently derive these parameters for every project. However, there exists a lacuna in the understanding of their relationship to the accuracy of the final data and their products on the ground. This has severely restricted the ability of local and state governments to fully leverage the potential of LiDAR data. The solution to the problem requires a thorough analysis and definition of the calibration parameters and their effects on ground accuracy, and the definition of a common process via ASPRS.

  3. Background • Discussion at Fall ASPRS (and many previous ASPRS presentations and committee meetings) • on the strong need for common cal/val and QA processes • USGS Specification v13 and associated QA/ QC needs • 4 monthly telecons and ILMF discussions • LiDAR QA/QC Face-to-Face meeting , Friday May 2, 2011, ASPRS annual conference, Milwaukee

  4. Objective • The objective of the Face-to-Face meeting was to elaborate on LiDAR QA/calibration activities of the last few months and assign tasks and actions. The meeting seek to establish the need and actions for solving and documenting the LiDAR cal/val and QA issues, and define how to get it done. • Agenda: • Welcome, Introduction, and Purpose of the Meeting • LiDAR QA/QC issues/problems • Summarize the previous 4 Telecons • Discuss LiDAR specifications: Write, review and edit LiDAR QA/calibration terms, processes • The LiDAR Calibration spreadsheet • Call for volunteers for writing, reviewing and editing. • Discuss the format of specifications for the QA/calibration documents. Models include LAS, etc. • Define the Way Forward

  5. Purpose During the telecons and F2F meeting, we have agreed on the need for a coordinated QA/calibration process for LiDAR. This effort has resulted in a lot of important discussion that will hopefully lead to an ASPRS documentation of QA/calibration processes of LiDAR. Currently, the members attending the telecon are in the process of defining the salient terminology, definitions and concepts required to unambiguously describe the QA/calibration process. In this regard, a matrix sheet synthesizing these activities has been generated, and members are requested to volunteer to document, review and edit these LiDAR QA/calibration processes, terms and definitions based on the matrix.

  6. Error Process Spreadsheet

  7. Next Steps • Continue monthly telecons, establish working group face to face meetings • Include additional interested Airborne and Mobile Mapping LiDAR Sub-committees and PDAD members • Define outline and matrix the work • Provide enhanced work matrix and obtain documents • Data Link - ftp://edcftp.cr.usgs.gov/edcuser/stensaas/outgoing/LiDAR%20Calibration/ • Compile input and peer review • Continue to support ASPRS LiDAR QA and calibration guidelines and best practices. • Many support groups including work by NGA GWG • Draft by Fall ASPRS

  8. Questions?

  9. Minnehaha County 12 Inch Sioux Falls Lincoln County 6 Inch 3 Inch USGS Cal/Val Basemap range: hi res image and LiDAR data Geometric Targets and Control Data Provider Evaluation & Cal/Val Range Creation • During the research effort, ranges were prepared as part of the preparation to support Sensor Assessment and Data Provider Evaluation • Operational Data Provider evaluation process is now stopped • Research Evaluation of Sensors Only • Developing Cal/Val Range Stds. & 5 National Ranges • Dual use for hi-res ortho & satellite, & LiDAR cal/val Large area Geometric Test Range

  10. USGS National Range Locations • Sioux Falls, SD; Rolla, MO and Pueblo, CO Ranges Completed • Airy, North Carolina and Rochester, NY Ranges In-Process

  11. Terrestrial LiDAR collected by USGS, Vivian Queija • USGS EROS by Vivian Queija on June 21-22, 2010 • Sioux Falls, SD on June 23, 2010 • Test data only; interested in point cloud and test range model; what do we need for targets and good performance testing • Note: Images quick look only and are not fully processed

  12. Same scan with points colored by intensity. Front view of the water tower colored with RGB. Same scan, rotated for back view.

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