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Keywords
Physical Location
Data Set Info
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Spatial Info
Access Info
Distribution Info
Activity Log
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Catalog Details

Summary

Short Citation
OCM Partners, 2024: 2006 FEMA New Jersey Flood Mitigation Lidar: Hunterdon County, https://www.fisheries.noaa.gov/inport/item/49854.
Full Citation Examples

Abstract

This metadata record describes the lidar topographic elevation mapping of Hunterdon County, NJ that occurred in July 2006. Products generated

include lidar point clouds in LAS 1.0 collected with a Leica ALS-50 Aerial Lidar Sensor.

Original contact information:

Contact Name: Angela R. Worley

Contact Org: EarthData International

Title: Project Manager

Phone: 301-948-8550 x222

Email: aworley@earthdata.com

Distribution Information

  • Create custom data files by choosing data area, product type, map projection, file format, datum, etc.

  • Simple download of data files.

Access Constraints:

None

Use Constraints:

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data may no longer represent actual surface conditions.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.

Controlled Theme Keywords

elevation

Child Items

No Child Items for this record.

Contact Information

Point of Contact
NOAA Office for Coastal Management (NOAA/OCM)
coastal.info@noaa.gov
(843) 740-1202

Metadata Contact
NOAA Office for Coastal Management (NOAA/OCM)
coastal.info@noaa.gov
(843) 740-1202

Extents

Geographic Area 1

-75.195215° W, -74.703495° E, 40.787876° N, 40.339414° S

Time Frame 1
2006-07-17

Item Identification

Title: 2006 FEMA New Jersey Flood Mitigation Lidar: Hunterdon County
Short Name: nj2006_hunterdon_m547_metadata
Status: Completed
Publication Date: 2007-02-26
Abstract:

This metadata record describes the lidar topographic elevation mapping of Hunterdon County, NJ that occurred in July 2006. Products generated

include lidar point clouds in LAS 1.0 collected with a Leica ALS-50 Aerial Lidar Sensor.

Original contact information:

Contact Name: Angela R. Worley

Contact Org: EarthData International

Title: Project Manager

Phone: 301-948-8550 x222

Email: aworley@earthdata.com

Purpose:

The purpose of this data is to support floodplain mapping efforts as part of FEMA's Map Modernization Program.

Notes:

10498

Supplemental Information:

Watershed Concepts requested the collection of lidar data over Hunterdon County, NJ. In response, EarthData acquired the data on July 17, 2006 using

its aircraft with tail number N806CP. Lidar data was acquired using an ALS-50 Lidar Sensor, including an inertial measuring unit (IMU) and a dual

frequency GPS receiver. An additional GPS receiver was in constant operation over a published control point set by EarthData at the base of the

operations airport which is a secondary airport control station.

Terrasurv was tasked to perform a geodetic control survey in support of lidar mapping in Hunterdon County, NJ. The Global Positioning System (GPS)

was used in static differential mode to measure the intersection vectors of the network. In addition to six locations chosen for control, a survey

point located at the Lehigh valley International Airport was included in the network. This latter station was used a base station by the flight crew

during data acquisition. The horizontal datum was the North American Datum of 1983-CORS (NAD83 CORS) and the vertical datum was the North American

Vertical Datum of 1988.

During the data acquisition, the receivers collected phase data at an epoch rate of 1 Hz. The use of the airport base station ensured that all data

capture was within 50 miles of a base station. The solutions from Hunterdon County, NJ were found to be of high integrity and met the accuracy

requirements for the project. These accuracy check also verified that the data meets the guidelines outlined in FEMA's Guidelines and Specifications

for Flood Hazard Mapping Partners and Appendix 4B, Airborne Light detection and Ranging Systems.

The areas of interest were flown at an altitude of 8500 feet above mean terrain.

Airspeed - 145 knots; Laser Pulse Rate - 38000 Hz; Field of View - 40 degrees; Scan Rate - 20 Hz; Swath Width - 1996 meters

A footprint of this data set may be viewed in Google Earth at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/547/supplemental/2006_FEMA_NJ_Lidar_Hunterdon_County.kmz

Keywords

Theme Keywords

Thesaurus Keyword
ISO 19115 Topic Category
elevation
UNCONTROLLED
None bare earth
None floodplain

Physical Location

Organization: Office for Coastal Management
City: Charleston
State/Province: SC

Data Set Information

Data Set Scope Code: Data Set
Maintenance Frequency: Unknown
Distribution Liability:

Any conclusions drawn from the analysis of this information are not the responsibility of NOAA,

the Office for Coastal Management or its partners.

Support Roles

Data Steward

CC ID: 680593
Date Effective From: 2007-02-26
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Distributor

CC ID: 680595
Date Effective From: 2007-02-26
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Metadata Contact

CC ID: 680596
Date Effective From: 2007-02-26
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Point of Contact

CC ID: 680594
Date Effective From: 2007-02-26
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Extents

Currentness Reference: Ground Condition

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 1138855
W° Bound: -75.195215
E° Bound: -74.703495
N° Bound: 40.787876
S° Bound: 40.339414

Extent Group 1 / Time Frame 1

CC ID: 1138854
Time Frame Type: Discrete
Start: 2006-07-17

Spatial Information

Spatial Representation

Representations Used

Vector: Yes

Access Information

Security Class: Unclassified
Data Access Procedure:

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

Data Access Constraints:

None

Data Use Constraints:

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.

Distribution Information

Distribution 1

CC ID: 741724
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=547
Distributor:
File Name: Customized Download
Description:

Create custom data files by choosing data area, product type, map projection, file format, datum, etc.

Distribution 2

CC ID: 741725
Download URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/547/index.html
Distributor:
File Name: Bulk Download
Description:

Simple download of data files.

Activity Log

Activity Log 1

CC ID: 680613
Activity Date/Time: 2016-05-23
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 680612
Activity Date/Time: 2017-11-14
Description:

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.

Activity Log 3

CC ID: 718433
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 741726
Activity Date/Time: 2018-03-13
Description:

Partial upload to move data access links to Distribution Info.

Data Quality

Accuracy:

Lidar data was collected and processed in accordance with FEMA guidance and specifications, as published in Appendix A: Guidance for Aerial

Mapping and Surveying, April 2003.

Horizontal Positional Accuracy:

The lidar data fully comply with FEMA guidance as published in Appendix A: Guidance for Aerial Mapping and Surveying, April 2003.

Vertical Positional Accuracy:

The lidar data fully comply with FEMA guidance as published in Appendix A: Guidance for Aerial Mapping and Surveying, April 2003 and the National

Standard for Spatial Accuracy (NSSDA). When compared to GPS survey grade points in generally flat non-vegetated areas, at least 95% of the

positions have an error less than or equal to 36.3 cm (equivalent to a RMSEz of 18.5 if errors are normally distributed).

Completeness Report:

- EarthData's proprietary software, Checkedb, was used for verification against ground survey points.

- Verification of automated and manual editing, and final QC of products, was performed using Terrascan.

Conceptual Consistency:

Compliance with the accuracy standard was ensured by the placement of GPS ground control points prior to lidar data acquisition. The following checks

were performed:

- The ground control and airborne GPS data stream were validated through a fully analytical boresight analysis.

- The Digital Terrain Model (DTM) data were checked against the project control.

- Lidar elevation data was validated through an inspection of edge matching and visual inspection for quality (artifact removal).

Lineage

Sources

Hunterdon County, New Jersey FEMA Flood Mitigation LiDAR

CC ID: 1138850
Publish Date: 2007-02-26
Extent Type: Discrete
Extent Start Date/Time: 2006-07-17
Citation URL: http://www.earthdata.com/
Source Contribution:

LiDAR data Hunterdon County, New Jersey FEMA Flood Mitigation LiDAR | Type of Source Media: hard drive

Process Steps

Process Step 1

CC ID: 1138851
Description:

EarthData has developed a unique method for processing lidar data to identify and remove elevation points falling on vegetation, buildings, and

other non-ground structures. The algorithms for filtering data were utilized within EarthData's proprietary software and commercially available

software written by TerraSolid. This software suite of tools provides efficient processing for small to large scale projects and has been

incorporated into ISO 9001 compliant production workflows. The following process was employed:

- Using the lidar data provided by EarthData, the technician performed calibrations of the data.

- Using the lidar data provided by EarthData, the technician performed a visual inspection of the data verify that the flight lines overlap

correctly. The technician also verified that there were no voids, and that the data covered the project limits. The technician then selected a

series of areas from the data set and inspected them where adjacent flight lines overlapped. These overlapping areas were merged and a process

which utilizes ArcGIS 3D Analyst and EarthData's proprietary software was run to detect and color code the differences in elevation values and

profiles. The technician reviewed these plots and located the areas that contained systematic errors or distortions that were introduced by the

lidar sensor.

- Identified systematic distortions were removed and the data were re-inspected. Corrections and adjustments can involve the application of angular

deflection or compensation for curvature of the ground surface that can be introduced by crossing from one type of land cover to another.

- The lidar data for each flightline was trimmed for the removal of the overlap areas between flightlines. The data was checked against a control

network to ensure that vertical requirements were maintained. Conversion to the client-specified datum and projections were then completed.

The lidar flightline datasets were then tiled for batch processing and data management.

- The initial batch processing removed 95% of points falling on vegetation. The algorithm also removed the points that fell on the edges of hard

features such as buildings, elevated roadways and bridges.

- The technician interactively processed the data using lidar editing tools. During this final phase, the data was TINed based on desired thematic

layers to evaluate the automated classification previously performed. This allowed the technician to quickly reclassify points from one layer to

another and recreate the TIN surface to see the effect of edits. Georeferenced images were toggled on and off to aid in identification of problem

areas. The data were also examined with an automated profiling tool to aid in reclassification.

- The final DEM was written to las 1.0.

- The point cloud data delivered in las 1.0

Process Date/Time: 2007-02-26 00:00:00

Process Step 2

CC ID: 1138852
Description:

The NOAA Office for Coastal Management (OCM) received the files in las format. The files contained Lidar elevation and intensity measurements.

The data were projected in New Jersey State Plane coordinates, and referenced to NAVD88 using Geoid 03. OCM performed the following processing

steps to the data to make it available within the Digital Coast:

1. The data were converted from New Jersey State Plane (NAD83) coordinates to geographic coordinates (NAD83).

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.

Process Date/Time: 2010-09-22 00:00:00

Catalog Details

Catalog Item ID: 49854
GUID: gov.noaa.nmfs.inport:49854
Metadata Record Created By: Anne Ball
Metadata Record Created: 2017-11-15 15:22+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2022-08-09 17:11+0000
Metadata Record Published: 2022-03-16
Owner Org: OCMP
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Last Review Date: 2022-03-16
Metadata Review Frequency: 1 Year
Metadata Next Review Date: 2023-03-16