2008 USGS South New Jersey County Project Lidar: Portion of Salem County
This kmz file shows the extent of coverage for the 2008 USGS Salem County, NJ lidar data set.
The South New Jersey County Lidar Project is to provide LiDAR data for the New Jersey Department of Environmental Protection (NJ-DEP) for Cape May, Cumberland, and part of Salem Counties in New Jersey. These datasets will be the initial acquisition to support the United States Geological Survey (USGS) and the New Jersey Department of Environmental Protection (NJ-DEP). This LiDAR data set was collected in April 2008 for the bay side of Salem County and covers 76 square miles. The data are classified as follows: Class 1 - Unclassified/Extracted Features Class 2 - Bare Earth, Ground Class 9 - Water Class 12 - Overlap
|Other Access||Online access information not available.|
|Distributor||DOC/NOAA/NOS/OCM > Office for Coastal Management, National Ocean Service, National
Oceanic and Atmospheric Administration, U.S. Department of Commerce
|Dataset Point of Contact||Roger Barlow
USGS Geospatial Liason for DC, DE, MD, NJ, and Chesapeake Bay
U.S. Geological Survey
Documentation links not available.
|Data Presentation Form:|| Digital image
|Dataset Progress Status||Complete|
|Data Update Frequency:||Unknown|
Technical Acquisition Parameters: Utilizing Leica ALS50 II laser systems which can collect data at laser pulse rates up to 150 KHz, Photo Science flew the project area at 5,000 feet AGL and utilized a 29 degree full-angle field of view. Flights were accomplished nominally at 115 knots (ground speed) with a pulse rate of 73,500Hz (73.5 KHz), collecting four returns per pulse. The scan rate was be set at 42Hz. These settings resulted in a swath of 2,586 feet with maximum along track and cross track spacing of 4.62 feet (1.41 meters). Environmental Acquisition Conditions: Leaf-Off, snow free, non-flood conditions, low tide. Low tide: Acquisition was performed within a window of +/- 3 hours from mean low tide for the project area (flight windows that occur twice a day, that are approximately six hours in length but could be longer depending on the lunar cycle). Low tide is defined as when the height of tide is different from Mean Lower Low water by fifty percent (50%) of the tide range or less as predicted by the National Oceanic and Atmospheric Administration (NOAA), National Oceanic Service (NOS) Center for Operational Oceanographic Product and Services (http://www.co-ops.nos.noaa.gov/). All flight lines affected by tide stage were coordinated with predicted tides at existing gauges at Cape May, Ship John Shoal, and Reedy Point. Nominal Pulse density: Average point density is 1.58 points per sq meter Average point spacing is 0.8 meters, or 8 decimeters. Calibration procedures: Photo Science has created a significant boresight facility at the Frankfort, KY airport where the Lidar platforms are stationed when not in service. Boresighting at this facility takes place with our Lidar sensors at numerous times throughout the year. Additionally, a mini-calibration site was established at the Millville Municipal Airport at the project site. Additional calibration flights were conducted over this site to ensure accurate determination of the calibration parameters throughout the times of acquisition. GPS: Acquisition for this project was broken into three sub areas with base stations from the NGS database selected near the center of each acquisition area to serve as control for all lifts. Ground based GPS receivers were occupied at these stations during all aerial collection. The published NGS positions of these base stations and raw GPS observation data were used in the kinematic GPS post-processing of all lifts to provide positioning for the point clouds produced for this project. Maximum and mean differential baseline lengths: Nominal Maximum base line distance = 20 Miles Mean base line distance = 11 Miles Geoid Model Used: Geoid 03 was used for all elevation conversions to orthometric heights. Reference System: Horizontal: New Jersey State Plane Coordinate System, 1983 North American Datum, feet Elevation in North American Vertical Datum of 1988 (NAVD88), meters. Data delivered from vendor as LiDAR point data in LAS 1.1; ASPRS classification scheme: Class 1 - Unclassified; Class 2 - Bare Earth Ground; Class 9 - Water; Class 12 - Overlap.
|Purpose:||The South New Jersey County Lidar project is to provide LiDAR data for New Jersey Department of Environmental Protection (NJ-DEP). This project acquired and produced high accuracy bare-earth processed LiDAR data in LAS format and 2.0-meter Digital Elevation Models (DEMs) in ArcGrid format for approximately 874 square miles covering the 3 New Jersey counties of Cape May, Cumberland, and part of Salem that is south and west of the Coastal Area Facility Review Act (CAFRA) line.|
|Time Period:||Unknown to Unknown|
|Spatial Reference System:||urn:ogc:def:crs:EPSG::4269|
|Spatial Bounding Box Coordinates:||
|Spatial Coverage Map:|
|Use Constraints||No constraint information available|
|Fees||Fee information not available.|
Last Modified: 2013-06-05
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