2010 USACE NCMP Topobathy Lidar: Atlantic Coast (VA)

These files contain topographic lidar data classified as ground (2) and unclassified (1) in accordance with the American Society for Photogrammetry

and Remote Sensing (ASPRS) classification standards. These data were collected by the Compact Hydrographic Airborne Rapid Total Survey (CHARTS)

system along the coast of Virginia. CHARTS integrates topographic and bathymetric lidar sensors, a digital camera and a hyperspectral scanner on a

single remote sensing platform for use in coastal mapping and charting activities. Data coverage generally extends along the coastline from the

waterline inland 500 meters (topography) and offshore 1,000 meters or to laser extinction (bathymetry). The topographic lidar sensor has a pulse

repetition rate of 9 kHz at 1064 nm (near-infrared wavelength). The bathymetric lidar sensor has a pulse repetition rate of 1 kHz at 532 nm

(green wavelength). Native lidar data is not generally in a format accessible to most Geographical Information Systems (GIS). Specialized in-house

and commercial software packages are used to process the native lidar data into 3-dimensional positions that can be imported into GIS software for

visualization and further analysis. The 3-D position data are sub-divided into a series of LAS files, each covering approximately 5 kilometers of shoreline. The file index

is provided by the shape file, "va_boxes_QQ.shp", and the numbers used to identify files are in the "Box" field of the shape file. The LAS file

naming convention is based on the year, project, area name, "Box," and the product type. An example file name is "2010_NCMP_VA_28_GeoClassified.las",

where 2010 is the year of data collection, NCMP is the project under which data were collected, VA is the area of data collection, 28 is the "Box"

number and "GeoClassified" is the product type. The format of the file is LAS version 1.1.

In addition to these lidar point data, the bare earth Digital Elevation Models (DEM) created from the lidar point data are also available. These data are available for custom download at the link provided in the URL section of this metadata record.

These data were collected as a part of the NCMP to depict the elevations above the water in the Virginia coastal zone.

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

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/1132/supplemental/2010_USACE_JALBTCX_Virginia_Lidar.kmz

Any conclusions drawn from the analysis of this information are not the responsibility of JALBTCX, the Office for Coastal Management or its partners.

This data can be obtained on-line at the following URL: https://coast.noaa.gov/dataviewer;

None

Users should be aware that temporal changes may have occurred since this data set was collected and some parts of

this data may no longer represent actual surface conditions. Users should not use this data for critical applications without a

full awareness of its limitations. These data depict the heights at the time of the survey and are only accurate for that time.

Microsoft Windows 2000 Version 5.2 (Build 3790) Service Pack 2; ESRI ArcCatalog 9.3.0.1770

The data positions were obtained using post processed KGPS methods. The horizontal accuracy of the data is better than plus or minus 0.75 m at 1 Sigma

The data positions were obtained using post processed KGPS methods. The vertical accuracy of the data is better than plus or minus 0.20 m at1 Sigma

None provided

The data provided in this file were tested against ground truth data. At these locations the lidar data matched within 0.20 meters and different flight line data agreed within 0.20 meters.

The USACE collected, processed, and provided the data to the NOAA Office for Coastal Management (OCM). OCM received the data and processed it to be available for custom download from the Data Access Viewer (DAV) and for bulk download from an Amazon Web Services (AWS) S3 bucket.