Data Management Plan

These files contain classified topographic and bathymetric lidar data as unclassified valid topographic data (1) and valid

topographic data classified as ground (2), Classes 1 and 2 are defined in accordance with the American Society for

Photogrammetry and Remote Sensing (ASPRS) classification standards. The data were collected on November 16, 2012 and cover

portions of the following counties:

New Jersey - Bergen, Essex, Hudson, Middlesex, Monmouth, Ocean, Union

New York - Bronx, Kings, Nassau, New York, Queens, Richmond, Suffolk, Westchester

These data were collected by the Coastal Zone Mapping and Imaging Lidar (CZMIL) system. CZMIL integrates a lidar sensor with

topographic and bathymetric capabilities, a digital camera and a hyperspectral imager on a single remote sensing platform

for use in coastal mapping and charting activities. Native lidar data is not generally in a format accessible to most Geographic

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. 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) GEOID12A model

is used to transform the vertical positions from ellipsoid to orthometric heights referenced to the North American Vertical

Datum of 1988 (NAVD88).

For data storage and Digital Coast provisioning purposes, the NOAA Office for Coastal Management converted

the data from orthometric heights referenced to the North American Vertical Datum of 1988 (NAVD88) to ellipsoid heights using

the NGS GEOID12A model.

Original contact information:

Contact Org: JALBTCX

Title: Data Production Manager

Phone: 228-252-1121

Email: JALBTCX@usace.army.mil

Process Steps:

• 2012-12-23 00:00:00 - These data were collected using the CZMIL system. It is owned and operated by the U.S. Army Corps of Engineers (USACE). The system collects lidar data at 10 kHz and RGB imagery at 2 Hz. A CASI-1500 hyperspectral line scanner is integrated with the system as well. Aircraft position, velocity and acceleration information are collected through a combination of Novatel and POS A/V 510 equipment. All raw data streams are transferred to the office for downloading and processing in CZMILs Hydro Fusion software. Aircraft position data are processed using POSPac software and the results are combined with the lidar data to produce 3-D positions for each lidar shot. Upon inspection and QA/QC in the software packages Fledermaus and PFM_ABE, anomalous data are flagged as invalid. NOAAs VDatum software then converts all valid data from ellipsoid to orthometric heights based on the NGS' GEOID12A model and exports valid lidar data as a series of unclassified ascii xyz files.
• The flightline LAS files are imported into GeoCue [V2012], which is a geospatial workflow production and management software tool employed by JALBTCX to perform and monitor production of data products. Upon import into GeoCue, the flightline LAS files are divided into a series of boxes, each of which are 1500 meters in length and width. A customized classification macro, built upon the TerraScan [V12] module within Microstation V8i, classifies valid topographic data as ground points (2) and unclassified points (1). Upon completion the macro, the classification results undergo quality control and any misclassified points are manually edited. In areas of dense vegetation the bare earth ground points might be incorrectly classified due to the inability of the laser to penetrate the canopy and reach the bare ground. In these areas, JALBTCX defaults to the algorithms ground surface instead of manually reclassifying those points. The final classification results are comprised of individual lidar points with classifications of ground (2) or unclassified (1). They are partitioned into a series of USGS quarter quad delivery boxes, one Classified LAS file per box. The format of the file is LAS version [1.2]. Data are classified as 1 (valid non-ground topographic data), 2 (valid ground topographic data).
• 2013-04-01 00:00:00 - The NOAA Office for Coastal Management (OCM) received the files in LAS v1.2 format. The files contained lidar elevation and intensity measurements. The data were received in geographic coordinates (NAD83) and vertically referenced to NAVD88 using the Geoid12A model. The vertical units were meters. The data were classified according to ASPRS LAS classification scheme (1 = unclassified, 2 = ground). OCM performed the following processing for data storage and Digital Coast provisioning purposes: 1. The las files were converted from orthometric (NAVD88) heights to ellipsoidal heights using Geoid12A.

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

https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=2478

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