2007 NCMP NY Ontario Laser Reflectance

The mosaic image contained in this file is comprised of the seafloor reflectance generated from the bathymetric laser energy. It contains multiple flightlines that were collected by the Compact Hydrographic Airborne Rapid Total Survey (CHARTS) system along the coast of New York. 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 and offshore 1,000 meters or to laser extinction. Native imagery data is not generally in a format accessible to most Geographical Information Systems (GIS). Specialized in-house and commercial software packages processes the imagery data into GIS-compatible products for visualization and further analysis. Horizontal positions, provided in decimal degrees of latitude and longitude, are referenced to the North American Datum of 1983 (NAD83). Vertical positions are referenced to the NAD83 ellipsoid and provided in meters. The National Geodetic Survey's (NGS) GEOID03 model is used to transform the vertical positions from ellipsoid to orthometric heights referenced to the North American Vertical Datum of 1988 (NAVD88). The SHOALS 532 laser has also been radiometrically calibrated to be able to determine the same reflectance for an object on any given day or operating altitude. The seafloor reflectance is generated from individual bathymetric waveforms, rasterized, and then a mosaic is produced for each flight. The accuracy is within 5% of the true reflectance. The data file naming convention is based on the year, project, area name, "Box" number, and product type. An example file name is "2007_NCMP_NY_Ontario_Laser_Reflectance_070615_1206.tif," where 2007 is the year of data collection, NCMP is the project under which data were collected, NY_Ontario is the area of data collection, "Laser_Reflectance" is the product type, and 070615_1206 is the YYMMDD_HHMM for the start time of the flight.

Original contact information:

Contact Org: JALBTCX

Title: Data Production Manager

Phone: 228-252-1121

Email: shoals-info@sam.usace.army.mil

These data were collected as a part of the NCMP to obtain the existing conditions of the beach and near shore.

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Users must assume responsibility to determine the usability of these data.

None

These images depict the existing conditions of the beach and nearshore at the time of the survey and are only accurate for that time. Acknowledgment of the Joint Airborne Lidar Bathymetry Technical Center of eXpertise (JALBTCX) would be appreciated in any publications or derived products.

Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.4.1420

These data are not attributed. | Quantitative Value: N/A | Quantitative Test Explanation: These data are not attributed.

The positions were obtained using post processed KGPS methods. The horizontal accuracy is better than +/- 0.75m.; Quantitative Value: 0.75 meters, Test that produced the value: 1 Sigma

The positions were obtained using post processed KGPS methods. The vertical accuracy is better than +/- 0.20m.; Quantitative Value: 0.20 meters, Test that produced the value: 1 Sigma

Cloud Cover: Unknown

The imagery covered the required survey area with minimal gaps in data coverage.

Tests for logical consistency indicate that all row and column positions in the selected latitude/longitude window contain data. Conversion and integration with vector files indicates that all positions are consistent with earth coordinates covering the same area. Attribute files are logically consistent.