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Short Citation:
OCM Partners, 2023: 2009 USGS New Jersey Lidar: Mercer County,

Item Identification

Title: 2009 USGS New Jersey Lidar: Mercer County
Short Name: nj2009_mercer_m546_metadata
Status: Completed

High accuracy LiDAR data covering Mercer County New Jersey (228 sq miles). These datasets will be the initial acquisition to support

general geospatial needs of the USGS and the New Jersey Department of Environmental Protection (NJ-DEP).


The purpose of the Mercer 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 1.0-meter Digital Elevation Models

(DEMs) in ArcGrid format for approximately 228 square miles of Mercer County.



Supplemental Information:

- 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 7,000 feet AGL and utilized a 19 degree full-angle field of view. Flights were accomplished nominally at 98 knots

(ground speed) with a pulse rate of 113,600Hz, collecting four returns per pulse. The scan rate was be set at 50.4Hz. These

settings resulted in a swath of 2,343 feet with maximum along track and cross track spacing of 3.28 feet (1.0 meters).

- Environmental Acquisition Conditions: Leaf-Off, snow free, non-flood conditions.

- Nominal Pulse density:

Average point density is 3.15 points per sq. Meter

Average point spacing is 0.56 meters.

- 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 Robbinsville 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


- GPS:

Acquisition for this project was completed using the base station from the NGS database selected near the center of the

acquisition area to serve as control for all lifts. A ground based GPS receiver was occupied at the station during all aerial

collection. The published NGS positions of the base station 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 was approximately 20 Miles

Mean base line distance was approximately 11 Miles

- Geoid Model Used:

Geoid 03 was used for all height conversion from ellipsoidal to orthometric heights.

- Reference System:

Horizontal: New Jersey State Plane Coordinate System, 1983 North American Datum, feet

Vertical: North American Vertical Datum of 1988 (NAVD88), feet

The Lidar QA/QC Quantitative and Qualitative Assessment Report for this data set may be viewed at:

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


Theme Keywords

Thesaurus Keyword
ISO 19115 Topic Category

Physical Location

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

Data Set Information

Data Set Scope Code: Data Set
Maintenance Frequency: None Planned
Entity Attribute Overview:

Attributes included: x,y,z to two significant digits; intensity and class as integers.

Also includes echo return, time stamp, etc.

Entity Attribute Detail Citation:

LiDAR point data in LAS 1.1; ASPRS classfication scheme: Class 1 - Unclassified/Extracted Features; Class 2 - Bare Earth Ground;

Class 9 - water; Class 12 - overlap.

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.

Data Set Credit: Acknowledgment of the U.S. Geological Survey would be appreciated for products derived from these data.

Support Roles

Data Steward

CC ID: 680721
Date Effective From: 2016-05-23
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address:
Phone: (843) 740-1202


CC ID: 680723
Date Effective From: 2016-05-23
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address:
Phone: (843) 740-1202

Metadata Contact

CC ID: 680724
Date Effective From: 2016-05-23
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address:
Phone: (843) 740-1202

Point of Contact

CC ID: 680722
Date Effective From: 2016-05-23
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address:
Phone: (843) 740-1202


Currentness Reference: Ground Condition

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 1138846
W° Bound: -74.956084
E° Bound: -74.471774
N° Bound: 40.425498
S° Bound: 40.126421

Extent Group 1 / Time Frame 1

CC ID: 1138845
Time Frame Type: Range
Start: 2009-03-31
End: 2009-04-25

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:;

Data Access Constraints:


Data Use Constraints:

Users should be aware that temporal changes may have occurred since this data set was collected and that 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: 741738
Download URL:
File Name: Customized Download

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

Distribution 2

CC ID: 741739
Download URL:
File Name: Bulk Download

Simple download of data files.



CC ID: 741741
URL Type:
Online Resource


CC ID: 741742
URL Type:
Online Resource

Activity Log

Activity Log 1

CC ID: 680739
Activity Date/Time: 2016-05-23

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 680738
Activity Date/Time: 2017-11-14

Converted from FGDC Content Standards for Digital Geospatial Metadata (version FGDC-STD-001-1998) using '' script. Contact Tyler Christensen (NOS) for details.

Activity Log 3

CC ID: 718437
Activity Date/Time: 2018-02-08

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 741740
Activity Date/Time: 2018-03-13

Partial upload to move data access links to Distribution Info.

Data Quality


The following aspects of the LiDAR data was verified during the course of the project processing:

-Data accuracy and errors

-Anomaly checks through full-feature hillshades and 3-D modeling

-Post automated classification Bare-earth verification

-Final quality control of deliverable products ensuring integrity, graphical quality

Horizontal Positional Accuracy:

Compiled to meet 1m horizontal accuracy

Vertical Positional Accuracy:

Using NSSDA standards, this LiDAR dataset will have a fundamental vertical accuracy of 35.32 cm at 95% confidence level, based on RMSE

of 18 cm in the open terrain land cover category.

Completeness Report:

Data completeness and integrity was verified.

Conceptual Consistency:

All LAS formatted LiDAR data are validated to ensure that data on delivery media is in correct physical format and

is readable and correctly georeferenced and projected. Note that LiDAR intensity is not calibrated or normalized.



Mercer County, New Jersey USGS LIDAR

CC ID: 1138840
Extent Type: Range
Extent Start Date/Time: 2009-03-31
Extent End Date/Time: 2009-04-25
Source Contribution:

LiDAR points were used to produce the deliverables. | Source Geospatial Form: digital data | Type of Source Media: hard drive

Process Steps

Process Step 1

CC ID: 1138841

Leica software was used in the post processing of the airborne GPS and inertial data that is critical to the positioning of the sensor

during all flights. This software suite includes Applanix's PosPac and Waypoint's GrafNav solutions. PosPac provides the smoothed best

estimate of trajectory (SBET) that is necessary for Leica's post processor to develop the point cloud from the LiDAR missions. The point

cloud is the mathematical three dimensional collection of all returns from all laser pulses as determined from the aerial mission. At this

point this data is ready for analysis, classification, and filtering to generate a bare earth surface model in which the above ground

features are removed from the data set.

The point cloud was manipulated within the Leica software; GeoCue, TerraScan, and TerraModeler software was used for the automated data

classification, manual cleanup, and bare earth generation from this data. Project specific macros were used to classify the ground and to

remove the side overlap between parallel flight lines. All data was manually reviewed and any remaining artifacts removed using

functionality provided by TerraScan and TerraModeler.

The project was tiled adhering to the State of New Jersey 5000'x5000' tile schema and each tile was saved in LAS format 1.1 including

GPS time.

Process Date/Time: 2009-06-01 00:00:00

Process Step 2

CC ID: 1138842

A Terrascan macro was used to classify the Lidar points inside rivers and lakes from class 2 to class 9. This classification was visually

inspected by comparing the bare earth class against the hydro breaklines.

Process Date/Time: 2009-06-01 00:00:00

Process Step 3

CC ID: 1138843

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 projected in New Jersey State Plane (NAD83) coordinates, and referenced to the orthometric datum of NAVD88 utilizing

Geoid 03. 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 ned(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: 49858
GUID: gov.noaa.nmfs.inport:49858
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