-National Lidar Initiative- the NDEP Perspective National Lidar Initiative Meeting February 2007 – Reston, VA Presented by Bryon Ellingson Executive Secretary,

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Presentation transcript:

-National Lidar Initiative- the NDEP Perspective National Lidar Initiative Meeting February 2007 – Reston, VA Presented by Bryon Ellingson Executive Secretary, National Digital Elevation Program

Topics: Who is the NDEP? NDEP Activities National Elevation Dataset Why a National Lidar Initiative is Important for ALL Elevation Data Users

National Digital Elevation Program BLM FEMANASA NGA NOAA NRCSUSFSUSGSUSACE NSGIC A consortium of agencies coordinating the collection and application of high-resolution, high-accuracy elevation data USFWS US Census

NDEP Established to promote the exchange of accurate digital land elevation data among government, private, and non-profit sectors and the academic community and to establish standards and guidance that will benefit all users. Federal (11 agencies), State (NSGIC Rep). Open Invitation to Participate Organization - Steering Committee, Technical Subcommittee, Project Coordination Subcommittee

NDEP Goals Enhance data sharing among Federal, State, and local agencies; the private sector; and academia; Minimize redundant data production; Leverage resources to satisfy multiple requirements; Develop flexible standards that meet the needs of most users; and Ensure the availability and accuracy of digital topographic data.

Technical Subcommittee Dean Gesch, EDC Guidelines for Digital Elevations Data (Version 1.0) general content and specifications product descriptions metadata profiles definitions map accuracy standards FGDC NSSDA Part 3 Revision References Strong Link to ASPRS Lidar Handbook

Project Coordination Subcommittee Bryon Ellingson, NGTOC III Project Tracking System Project Information Form Minimal Elevation Specific Metadata set Viewer View w/ Query tools GOS Harvestable (supports Module 3), Link with RAMONA and FEMA MIP activity

NDEP Guidelines “Best practices” document Developed by participation from multiple agencies Specify vertical accuracy testing and reporting approach in data collection contracts

ASPRS Lidar Guidelines Proposed “best practice” for testing and reporting accuracy of lidar-derived elevation data Most of ASPRS document is extracted verbatim from NDEP Guidelines Acknowledgement of NDEP effort is given up front in ASPRS document Recognition of NDEP approach for accuracy testing and reporting

NDEP Project Tracking

Current NED Holdings (a/o Nov, 2006) October 2006 release: nearly 67% 10-meter DEM source or better (June 2000 release: 17% 10-meter DEM source) 3 meters or better (2%) 10 meters or better (64%) 30 meters only (34 %) Source Data Resolution

WV (MPBL source) 1-arc-second (30 meters)1/3-arc-second (10 meters)1/9-arc-second (3 meters)

LA (lidar source) 1-arc-second (30 meters)1/3-arc-second (10 meters)1/9-arc-second (3 meters)

Is a National Lidar Collection Feasible? There are roughly 40 commercial Lidar sensors operating in U.S. today instruments dedicated to project could collect U.S. in 2-6 years Dependent on point density, derived products, accuracies, bare earth removal, weather, etc. Such a project could prompt purchases of additional sensors

Partners interested in National Coverage The concept of a national Lidar survey was explored at a Sep meeting NASA, USGS, NOAA, Association of American State Geologists NASA, USGS, USACE, NOAA, NGA, FEMA, NRCS, Forest Service, and other Federal agencies already collect Lidar data Growing interest in a full return Lidar baseline dataset for the nation to meet multiple requirements

Lidar Specification That Satisfies NDEP Guidelines meter average point spacing, Vertical Bare earth 18.5 cm 95% confidence, -15 cm 90% confidence, -Vertical in Vegetation 37 cm 95% confidence. -Horizontal 1m 95% confidence. -All product quality per FEMA guidelines and Specifications for Flood Mapping Partners -No data voids due to system malfunctions or lack of overlap -Dense vegetation data voids minimized by automatic removal process -instrument calibrated for every mission -flight plans are parallel flight lines with at least one cross flight line to assure positional accuracy. -Flight plan considers requirements for point density, terrain, PDOP, and KP index -Uses ONLY automated filtering for LIDAR products with the following minimum performance for bare earth models - 89% of artifacts or more removed depending on terrain and vegetation; 90% of outliers removed; 90% of all vegetation removed; 93% of all buildings removed -All data and products associated with contract deliverables will meet or exceed relevant NSSDA standards and full comply with FGDC metadata format standard -Deliverables will be submitted to customer in digital format according to requirements outlined in FEMA guidelines -Standard coordinates, projections and datums available. - No Independent field verification.

Possible Costs for National Collection For a deliberate cyclic effort that satisfies NDEP guidelines: approximately 200 million dollars (estimate from John Copple, CEO, Sanborn, February, 2007). If done in small, non-contiguous installments (such as we’re currently doing), the cost will be an order of magnitude more costly. Can we afford NOT to consider a National collection effort?