2008 Lake Michigan JALBTCX Natural Color Imagery

The mosaic image contained in this file is comprised of multiple RGB images that were collected by the Compact Hydrographic Airborne Rapid Total Survey (CHARTS) system along the coast of Illinois. 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). Individual images have been ortho-rectified and mosaiced into boxes that extend approximately 5 km along shore. The file index is provided by the shape file, "il_boxes.shp" and the numbers used to identify files are in the "Box" field of the shape file. The data file naming convention is based on the year, project, area name, "Box" number, and product type. An example file name is "2008_NCMP_IL_Michigan_01_RGB.tif," where 2008 is the year of data collection, NCMP is the project under which data were collected, IL_Michigan is the area of data collection, 01 is the "Box" number, and "RGB" is the product type.

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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Images with glare and dark flight lines are left due to 100% coverage in these areas. The gaps in the mosaics are due to lack of imagery coverage in these area or timing issues between images.

The data is in the public domain and may be redistributed. No restrictions or legal prerequisites for using the data. The data is suitable for use at appropriate scale, and is not intended for maps printed at scales greater or more detailed than 1:12,000 scale (1 inch = 1,000 feet).

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 2000 Version 5.2 (Build 3790) Service Pack 2; ESRI ArcCatalog 9.3.1.1850

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.

The elevation data used in the rectification of these images was 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.