Data Management Plan (Deprecated)

The data sets are generated using the OPTECH ALTM 70 kHz LIDAR system mounted onboard AeroMap's twin-engine

Cessna 320 aircraft. Classified data sets such as this one may have varying posting due to some LIDAR pulses not

reaching the ground caused by data anomalies. Accuracy statements are based on areas of moderate terrain. Diminished

accuracies are to be expected in areas of extreme terrain and dense vegetation. The accuracy of each point is expected

to meet the vertical accuracy standard; however, derived products may be less accurate in extreme terrain and dense

vegetation due to a lesser number of points defining the bare-earth in these areas. The data were QA/QC'ed but some

data holidays still exist. This data represents the last return data only.

Original contact information:

Contact Org: NOAA Office for Coastal Management

Phone: 843-740-1202

Email: coastal.info@noaa.gov

Process Steps:

• 2006-03-24 00:00:00 - The raw points for the point cloud data product were captured using AeroMap U.S.'s twin-engine Cessna equipped with our OPTECH ALTM 70 kHz LIDAR data acquisition system. The system includes differential GPS and inertial measurement systems to provide superior accuracy. The flying height is 1200 & 2000 meters Above Mean Terrain (AMT). These data were post-processed utilizing Optech's REALM (Version 3.5.4) software, which applies AeroMap U.S.'s Applanix Inertial Measurement Unit (IMU) values to the acquired Airborne Global Positioning Systems (ABGPS) data. These results are then applied to the acquired LIDAR data points and output to a LIDAR accuracy standard (LAS) format in a WGS 84, Universal Transverse Mercator (UTM), Zone 3, Meters coordinate system. Using Bentley's Microstation V8 LIDAR these data were imported in LAS format. Using TerraSolid's TerraScan (version 6.04) software, these data were imported into a TerraScan project files (PRJ) and converted (on import) to a binary files, no data were classified, all original "point cloud" data as output from REALM. These data were then output to the deliverable ASCII, space delimited, CTIXYZ format, (see attribute section for explanation of ASCII file syntax).
• 2006-03-24 00:00:00 - Created initial metadata (Citation: Lidar point cloud)
• 2007-02-09 00:00:00 - The NOAA Office for Coastal Management (OCM) received files in LAS format. The files contained lidar intensity and elevation measurements. OCM performed the following processing on the data to make it available within the Lidar Data Retrieval Tool (LDART): 1. All data points in the ASCII files were projected geographic decimals degrees using the USGS General Cartographic Transformation Package (GCTP) software. 2. All ASCII files containing points collected on the same date were combined into a single file and sorted by latitude. 3. The sorted files were then converted to binary LAS files and the las header fields were updated. 4. Data was QA/QC'ed and many points removed - there still remains several 'data holidays' as unique outliers in otherwise ordered areas. They can be manually edited by user if required. This data represents the last return data only. (Citation: Lidar point cloud)

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

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

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