49856
2007 FEMA New Jersey Flood Mitigation Lidar: Gloucester County
nj2007_gloucester_m544_metadata
Data Set
Published / External
49401
Lidar - partner (no harvest)
Project
Completed
2007-11-23
LIDAR data is remotely sensed high-resolution elevation data collected by an airborne collection platform. By positioning laser range
finding with the use of 1 second GPS with 100hz inertial measurement unit corrections, Terrapoint's LIDAR instruments are able to make
highly detailed geospatial elevation products of the ground, man-made structures and vegetation. These data were collected from
March 29 - April 6, 2007 for Gloucester County, New Jersey. The project area covers 353 square miles. The LiDAR flightlines for this
project were planned for a 50% acquisition overlap. The nominal resolution of this project without overlap is 1.25 m. Four returns were
recorded for each pulse in addition to an intensity value. GPS Week Time, Intensity, Flightline and number attributes were provided for
each LiDAR point. Data is provided as random points, in LAS v1.1 format, classified according to the following ASPRS Class Codes:
Class 1 - Non-ground
Class 2 - Ground
Class 7 - Noise
Class 9 - Water
Original contact information:
Contact Name: Claude Vickers
Contact Org: Terrapoint USA
Title: Production Manager
Phone: 1-877-80-TERRA
Email: claude.vickers@terrapoint.com
The purpose of this LiDAR data was to produce high accuracy 3D elevation based geospatial products for floodplain mapping for
Gloucester County, New Jersey.
10500
Please note that the LiDAR intensity is not calibrated or normalized. The intensity value is meant to provide relative signal
return strengths for features imaged by the sensor. Water is not included in the bare earth ground model, rather it is classified
as water on Class 9. Water body delineation was collected using hillshades, intensity and cross-sections from the LiDAR. In the event
of multiple tides from overlapping missions only the lowest tide was included for the water; nor were the peaks of tall waves;
all remaining points within the water body were classified to class 1.
The Lidar QA/QC Quantitative and Qualitative Assessment Report for this data set may be viewed at:
https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/544/supplemental/lidarqaqcreport_gloucester_final.pdf
A footprint of this data set may be viewed in Google Earth at:
https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/544/supplemental/2007_FEMA_NJ_Lidar_Gloucester_County.kmz
Theme
ISO 19115 Topic Category
elevation
Theme
ASPRS standards
Theme
OPTECH_3100EA
Office for Coastal Management
Charleston
SC
Data Set
None Planned
Any conclusions drawn from the analysis of this information are not the responsibility of NOAA,
the Office for Coastal Management or its partners.
Data Steward
2007-11-23
Organization
NOAA Office for Coastal Management
NOAA/OCM
coastal.info@noaa.gov
2234 South Hobson Ave
Charleston
SC
29405-2413
(843) 740-1202
https://coast.noaa.gov
NOAA Office for Coastal Management Home Page
Online Resource
Distributor
2007-11-23
Organization
NOAA Office for Coastal Management
NOAA/OCM
coastal.info@noaa.gov
2234 South Hobson Ave
Charleston
SC
29405-2413
(843) 740-1202
https://coast.noaa.gov
NOAA Office for Coastal Management Home Page
Online Resource
Metadata Contact
2007-11-23
Organization
NOAA Office for Coastal Management
NOAA/OCM
coastal.info@noaa.gov
2234 South Hobson Ave
Charleston
SC
29405-2413
(843) 740-1202
https://coast.noaa.gov
NOAA Office for Coastal Management Home Page
Online Resource
Point of Contact
2007-11-23
Organization
NOAA Office for Coastal Management
NOAA/OCM
coastal.info@noaa.gov
2234 South Hobson Ave
Charleston
SC
29405-2413
(843) 740-1202
https://coast.noaa.gov
NOAA Office for Coastal Management Home Page
Online Resource
Ground Condition
-75.45065
-74.862458
39.888795
39.504954
Range
2007-03-29
2007-04-06
Yes
Unclassified
This data can be obtained on-line at the following URL: https://coast.noaa.gov/dataviewer;
None
Users should be aware that temporal changes may have occurred since this data set was collected and some parts of this
data may no longer represent actual surface conditions. Users should not use this data for critical applications without a full awareness
of its limitations.
https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=544
Customized Download
Create custom data files by choosing data area, product type, map projection, file format, datum, etc.
https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/544/index.html
Bulk Download
Simple download of data files.
2016-05-23
Date that the source FGDC record was last modified.
2017-11-14
Converted from FGDC Content Standard for Digital Geospatial Metadata (version FGDC-STD-001-1998) using 'fgdc_to_inport_xml.pl' script. Contact Tyler Christensen (NOS) for details.
2018-02-08
Partial upload of Positional Accuracy fields only.
2018-03-13
Partial upload to move data access links to Distribution Info.
ArcView version 3.1 shapefile format
Raw elevation measurements have been tested to 0.181 m Fundamental Vertical Accuracy (FVA) at 95% confidence level.
Compiled to meet 1 m vertical accuracy at the 95% confidence level.
Tested to 0.181 m Fundamental Vertical Accuracy (FVA) at the 95% confidence level.
According to Terrapoint standards; the following aspects of the LiDAR data was verified during the course of the project processing:
-Data completeness and integrity,
-Data accuracy and errors,
-Anomaly checks through full-feature hillshades,
-Post automated classification Bare-earth verification,
-RMSE inspection of final bare-earth model using kinematic GPS,
-Final quality control of deliverable products; ensuring integrity; graphical quality; conformance to Terrapoint standards are met
for all delivered products.
All LiDAR files delivered were verified and tested to ensure they open and are positioned properly.
Gloucester County, New Jersey FEMA Flood Mitigation LiDAR
2007-11-23
Range
2007-03-29
2007-04-06
http://www.terrapoint.com/
LiDAR data Gloucester County, New Jersey FEMA Flood Mitigation LiDAR | Source Geospatial Form: map | Type of Source Media: Hard Drive
1
General Overview:
Project Area = 874 square kilometers, Type of Scanner = Optech 3100EA, Number of Scanners = 1, Data Acquisition Height = 1550 meters,
AGL Scanner Field of View = 46 degrees, The scan frequency = 30 Hertz, Pulse Repetition Rate = 71 Kilohertz, Aircraft Speed = 150 Knots,
Swath Width = 1315 m, Nominal Ground Sample Distance = 1.25 meters - no overlap, Number of Returns Per Pulse = 4, Distance Between
Flight Lines = 658 m, The Airborne LiDAR survey was conducted using one OPTECH 3100EA system flying at a nominal height of
1550 metres AGL, a total angular coverage of 46 degrees. Flight line spacing nominally 658 meters providing overlap of 50% on adjacent
flight lines. Lines were flown in NE/SW to best optimize flying time considering the layout for the project. The aircraft used for this
survey was a Piper Navajo, registration C-GPJT. This aircraft has a flight range of approximately 6 hours and was flown at an average
altitude of 1550 meters above ground level (AGL). The aircraft was staged from the Millville Airport and ferried daily to the project
site for flight operations.
GPS Receivers:
A combination of Sokkia GSR 2600 and Applanix POSAv-510 dual frequency GPS receivers were used to support the airborne operations of
this survey and to establish the GPS control network.
Number of Flights and Flight Lines:
A total of 8 missions were flown for this project with flight time ranging approximately 15 hours under good meteorological and GPS
conditions. 76 flight lines were flown over the project site to provide complete coverage.
Reference Coordinate System Used Existing NGS (National Geodetic Survey) monuments were observed in a GPS control network to establish
1 new station(s): Station_ID: 128U-01128U-01 was used as primary control for the project flight missions and kinematic ground surveys.
The published horizontal datum of the NGS stations is NAD83 and the vertical datum NAVD88. The following are the final coordinates
of the newly established control points used in this project: Station_ID: 128U-01, West_Longitude: 75 09 04.89385,
North_Latitude: 39 43 09.54246, Ellips_Elev: 14.761 m,
Geoid Model Used: The Geoid03 geoid model, published by the NGS, was used to transform all ellipsoidal heights to orthometric.
2007-04-01T00:00:00
2
Airborne GPS Kinematic
Airborne GPS kinematic data was processed on-site using GrafNav kinematic On-The-Fly (OTF) software. Flights were flown with a minimum
of 6 satellites in view (13o above the horizon) and with a PDOP of better than 3.5. Distances from base station to aircraft were kept
to a maximum of 30 km, to ensure a strong OTF (On-The-Fly) solution. For all flights,the GPS data can be classified as excellent,
with GPS residuals of 5 cm average but no larger than 10 cm being recorded.
Generation and Calibration of laser points (raw data)
The initial step of calibration is to verify availability and status of all needed GPS and Laser data against field notes and compile
any data if not complete. Subsequently the mission points are output using Optech's Dashmap, initially with default values from Optech
or the last mission calibrated for system. The initial point generation for each mission calibration is verified within
Microstation/Terrascan for calibration errors. If a calibration error greater than specification is observed within the mission,
the roll pitch and scanner scale corrections that need to be applied are calculated. The missions with the new calibration values are
regenerated and validated internally once again to ensure quality. All missions are validated against the adjoining missions for relative
vertical biases and collected GPS kinematic ground truthing points for absolute vertical accuracy purposes. On a project level, a
coverage check is carried out to ensure no slivers are present.
Data Classification and Editing
The data was processed using the software TerraScan, and followed the methodology described herein. The initial step is the setup of
the TerraScan project, which is done by importing client provided tile boundary index (converted to the native UTM zone for processing)
encompassing the entire project areas. The 3D laser point clouds, in binary format, were imported into the TerraScan project and
divided in 440 tiles in LAS 1.0 format. Once tiled, the laser points were classified using a proprietary routine in TerraScan. This
routine removes any obvious outliers from the dataset following which the ground layer is extracted from the point cloud. The ground
extraction process encompassed in this routine takes place by building an iterative surface model. This surface model is generated
using three main parameters: building size, iteration angle and iteration distance. The initial model is based on low points being
selected by a "roaming window" with the assumption that these are the ground points. The size of this roaming window is determined
by the building size parameter. The low points are triangulated and the remaining points are evaluated and subsequently added to the
model if they meet the iteration angle and distance constraints. This process is repeated until no additional points are added within
an iteration. A second critical parameter is the maximum terrain angle constraint,which determines the maximum terrain angle allowed
within the classification model. The data is then manually quality controlled with the use of hillshading, cross-sections and profiles.
Any points found to be of class vegetation, building or error during the quality control process, are removed from the ground model and
placed on the appropriate layer. An integrity check is also performed simultaneously to verify that ground features such as rock cuts,
elevated roads and crests are present. Once data has been cleaned and complete, it is then reviewed by a supervisor via manual
inspection and through the use of a hillshade mosaic of the entire project area.
Deliverable Tiling Scheme
All files were converted to LAS 1.1, in the specified projection and units and were delivered in the client provided tiling scheme
with a total of 440 tiles.
2007-11-01T00:00:00
3
The NOAA Office for Coastal Management (OCM) received the files in las format. The files contained Lidar elevation and intensity measurements.
The data were in New Jersey State Plane projection, and NAVD88 Geoid 03 vertical datum.OCM performed the following processing to the
data to make it available within the Digital Coast:
1. The data were converted from New Jersey State Plane coordinates to geographic coordinates.
2. The data were converted from NAVD88 (orthometric) heights to GRS80 (ellipsoid) heights using Geoid 03.
3. The LAS data were sorted by latitude and the headers were updated.
2010-08-01T00:00:00
gov.noaa.nmfs.inport:49856
Anne Ball
2017-11-15T15:22:47
SysAdmin InPortAdmin
2022-08-09T17:11:38
2022-03-16
OCM Partners
OCMP
1002
Public
No
2022-03-16
1 Year
2023-03-16