2010 VA Information Technologies Agency (VITA)/VA Geographic Information Network (VGIN) Lidar: Eastern Shore, VA (Accomack and Northampton Counties)

The Virginia Geographic Information Network (VGIN) contracted with Sanborn to provide LiDAR mapping services for Accomack and Northampton counties on the eastern shore of Virginia in the March of 2010. Utilizing multi-return systems, Light Detection and Ranging (LiDAR) data in the form of 3-dimensional positions of a dense set of mass points was collected for approximately 1090 square miles. Of this 1090 sq mile area, 663 sq miles are over land. Collection and delivery of the lidar data were required to meet the USGS LiDAR Guidelines and Base Specifications, version 13 classification scheme. The data available for download from the NOAA Digital Coast are classified as follows: 1 (Unclassified), 2 (Ground), 7 (Low Point/Noise), 9 (Water), and 10 (Ground points in close proximity to breaklines). This project was a cooperative effort funded by The Nature Conservancy (TNC) - Virginia Office, the University of Virginia's Virginia Coast Long-Term Ecological Research Project (VCR/LT ER) and the U.S. Geological Survey (USGS). Users should be aware that this data was not required to be collected at low tide, therefore, there are some flightlines that were collected at low tide and adjacent flightlines that were not collected at low tide.

Original contact information:

Contact Name: John A. Scrivani

Contact Org: Virginia Information Technologies Agency (VITA)

Phone: 804.416.6207

Email: john.scrivani@vita.virginia.gov

This LIDAR operation was designed to provide a high density set of masspoints within the defined areas. The data set is suitable for the development of contours for use in hydraulic/hydrologic model development, and for assessing environmental impacts. Typical uses for the data set include: flood plain map modernization, map updates, watersheds and other hydro studies per USGS specifications, county mapping projects which include several uses, in addition to flood mitigation assessment, and mapping projects that include accuracy verification, reporting and metadata.

10768

The Sanborn Report of Survey may be accessed at:

ftp://ftp.coast.noaa.gov/pub/DigitalCoast/lidar1_z/geoid18/data/2634/supplemental/va2010_vita_eastern_shore_m2634_survey_report.pdf

The Dewberry QA Report may be accessed at:

ftp://ftp.coast.noaa.gov/pub/DigitalCoast/lidar1_z/geoid18/data/2634/supplemental/va2010_vita_eastern_shore_m2634_qa_report.pdf

A footprint of this data set may be viewed in Google Earth at:

ftp://ftp.coast.noaa.gov/pub/DigitalCoast/lidar1_z/geoid18/data/2634/supplemental/va2010_vita_eastern_shore_m2634.kmz

None planned

Any conclusions drawn from the analysis of this information are not the responsibility of the Virginia Information Technologies Agency (VITA), Sanborn Map Company, Inc., the Office for Coastal Management or its partners. VITA does not warrant these data for any particular use and is not responsible for any damages resulting from the use of the data. Contact VITA for more details.

This data can be obtained on-line at the following URL:

https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=2634

This data set is dynamically generated based on user-specified parameters.;

None

Users should be aware that temporal changes may have occurred since this data set was collected and some parts of this data set may no longer represent actual surface conditions. Users should not use these data for critical applications without a full awareness of its limitations.

N/A; Quantitative Value: 0.15 meters, Test that produced the value: 15 cm RMSE. United States Geological Survey (USGS) LiDAR Specifications

Dewberry did an independent Qualitative Assurance of the lidar data. Dewberry surveyed 68 checkpoints for the project area extent. One checkpoint was not used in the vertical accuracy testing because it was improperly located on sloped terrain. According to USGS Lidar Guidelines and Base Specifications, v. 13, the consolidated vertical accuracy (CVA) must be 36.3 cm (1.2 ft) or less when computed with the 95th percentile method and the fundamental vertical accuracy (FVA) must be 24.5 cm (0.82 ft) or less when computed with RMSEz (12.5 cm or 0.4 ft) x 1.9600. In the first delivery, the CVA passed with a value of 0.61 ft, but the FVA failed with a value of 1.25 ft. Sanborn then performed numerous edits to the lidar data, including re-calibrations. The second delivery (and all subsequent deliveries) of the data passed vertical accuracy. The FVA tested 0.43 ft (13.1 cm), the RMSE (Root Mean Square Error) is 0.22 ft (6.7 cm). The Dewberry Lidar Quality Assurance (QA) Report - Eastern Shore Virginia (ESVA) Lidar Project may be viewed at: ftp://ftp.coast.noaa.gov/pub/DigitalCoast/lidar1_z/geoid18/data/2634/supplemental/va2010_vita_eastern_shore_m2634_qa_report.pdf Sanborn also did a Quality Assurance on the lidar data. The lidar data was evaluated using 15 GPS checkpoints. The FVA tested 0.343 ft (10.5 cm). The Sanborn Lidar Campaign (Accomack, VA) Report of Survey may be viewed at: ftp://ftp.coast.noaa.gov/pub/DigitalCoast/lidar1_z/geoid18/data/2634/supplemental/va2010_vita_eastern_shore_m2634_survey_report.pdf; Quantitative Value: 0.067 meters, Test that produced the value: 6.7 cm RMSE in open terrain.

None

None