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Short Citation:
OCM Partners, 2022: 2008 USGS/NPS/NASA Experimental Advanced Airborne Research Lidar (EAARL): Pearl River Delta, LA and MS, https://www.fisheries.noaa.gov/inport/item/50109.

Item Identification

Title: 2008 USGS/NPS/NASA Experimental Advanced Airborne Research Lidar (EAARL): Pearl River Delta, LA and MS
Short Name: usgs2008_pearl_river_m540_metadata
Status: Completed
Publication Date: 2009
Abstract:

A bare earth elevation map (also known as a Digital Elevation Model or DEM) of the Pearl River Delta in Louisiana and Mississippi

was produced from remotely sensed, geographically referenced elevation measurements cooperatively by the U.S. Geological Survey (USGS),

the National Park Service (NPS), and the National Aeronautics and Space Administration (NASA). This data set provides

those bare earth elevation measurements in portions of the following parishes/counties: Orleans and St. Tammany in Louisiana and

Hancock in Mississippi.

Elevation measurements were collected over the area using the NASA Experimental Advanced Airborne Research Lidar (EAARL), a pulsed

laser ranging system mounted onboard an aircraft to measure ground elevation, vegetation canopy, and coastal topography. The system

uses high frequency laser beams directed at the Earth's surface through an opening in the bottom of the aircraft's fuselage. The laser

system records the time difference between emission of the laser beam and the reception of the reflected laser signal in the aircraft.

The plane travels over the target area at approximately 50 meters per second at an elevation of approximately 300 meters. The EAARL,

developed by NASA at Wallops Flight Facility in Virginia, measures ground elevation with a vertical resolution of 15 centimeters.

A sampling rate of 3 kilohertz or higher results in an extremely dense spatial elevation dataset. Over 100 kilometers of coastline

can be easily surveyed within a 3 to 4 hour mission time period. When subsequent elevation maps for an area are analyzed, they provide

a useful tool to make management decisions regarding land development.

Original contact information:

Contact Name: Amar Nayegandhi

Contact Org: Jacobs Technology, contracted to USGS

Title: Computer Scientist

Phone: 727-803-8747 (x3026)

Email: anayegandhi@usgs.gov

Purpose:

The purpose of this project was to produce a highly detailed and accurate bare earth digital elevation map of the Pearl River Delta

in Louisiana and Mississippi for use as a management tool and to make these data available to natural resource managers and research

scientists.

Notes:

10753

Supplemental Information:

Raw Lidar data are not in a format that is generally usable by resource managers and scientists for scientific analysis. Converting

dense Lidar elevation data into a readily usable format without loss of essential information requires specialized processing.

The U.S. Geological Survey's Coastal and Marine Geology (CMG) Program has developed custom software to convert raw lidar data into

a GIS-compatible map product to be provided to GIS specialists, managers, and scientists. The primary tool used in the conversion

process is Airborne Lidar Processing System (ALPS), a multi-tiered processing system developed by a USGS-NASA collaborative project.

Specialized processing algorithms are used to convert raw waveform lidar data acquired by the EAARL to georeferenced spot (x,y,z)

returns for "first surface" and "bare earth" topography. These data are then converted to the North American Datum of 1983 and the

North American Vertical Datum of 1988 (using the Geoid 03 model). Each file contains data located in a 2 km by 2 km tile, where the

upper left bound can be quickly assessed through the file name. The first 3 numbers in the filename represent the left most

UTM easting coordinate (e###000) in meters, the next 4 numbers represent the top most UTM northing coordinate (n####000) in meters,

and the last 2 numbers (##) represent the UTM zone in which the tile is located (ex. be_e123_n4567_18).

The development of custom software for creating these data products has been supported by the U.S. Geological Survey CMG Program's

Decision Support for Coastal Parks, Sanctuaries, and Preserves project. Processed data products are used by the U.S. Geological

Survey CMG Program's National Assessments of Coastal Change Hazards project to quantify the vulnerability of shorelines to coastal

change hazards such as severe storms, sea-level rise, and shoreline erosion and retreat.

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

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/540/supplemental/2008_USGS_NPS_NASA_EAARL_Lidar_Pearl_River.kmz

Keywords

Theme Keywords

Thesaurus Keyword
ISO 19115 Topic Category
elevation
UNCONTROLLED
None ALPS
None EAARL

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
Data Presentation Form: LAS
Entity Attribute Overview:

The LAS grid is encoded with a 1 meter resolution.

Entity Attribute Detail Citation:

The variables measured by EAARL are distance between aircraft and GPS satellites (m), attitude information (roll, pitch, heading

in degrees), scan angle (degrees), second of the epoch (sec), and 1-ns time-resolved return intensity waveform (digital counts).

Z value is referenced to orthometric elevations derived from National Geodetic Survey Geoid Model, Geoid03.

Distribution Liability:

Although these data have been processed successfully on a computer system at the U.S. Geological Survey,

no warranty expressed or implied is made regarding the display or utility of the data on any other system, nor shall the act of

distribution imply any such warranty. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the

data described and (or) contained herein. Reference herin to any specific commercial product, process, or service by trade name,

trademark, manufacturer, or otherwise does not constitute or imply its endorsement, recommendation, or favoring by the United

States Government or any agency thereof.

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: The U.S. Geological Survey, National Park Service, and National Aeronautics and Space Administration request to be acknowledged as originators of this data in future products or derivative research. Acknowledgement of the U.S. Geological Survey, Florida Integrated Science Center, as a data source would be appreciated in products developed from these data, and such acknowledgement as is standard for citation and legal practices for data source is expected by users of this data. Sharing new data layers developed directly from these data would also be appreciated by the U.S. Geological Survey staff. Users should be aware that comparisons with other datasets for the same area from other time periods may be inaccurate due to inconsistencies resulting from changes in photointerpretation, mapping conventions, and digital processes over time. These data are not legal documents and are not to be used as such.

Support Roles

Data Steward

CC ID: 690806
Date Effective From: 2009
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: 690808
Date Effective From: 2009
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: 690809
Date Effective From: 2009
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: 690807
Date Effective From: 2009
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: 1138794
W° Bound: -89.833234
E° Bound: -89.411334
N° Bound: 30.259536
S° Bound: 30.052736

Extent Group 1 / Time Frame 1

CC ID: 1138791
Time Frame Type: Discrete
Start: 2008-03-09

Extent Group 1 / Time Frame 2

CC ID: 1138792
Time Frame Type: Discrete
Start: 2008-03-10

Extent Group 1 / Time Frame 3

CC ID: 1138793
Time Frame Type: Discrete
Start: 2008-03-11

Spatial Information

Spatial Representation

Representations Used

Vector: Yes

Access Information

Security Class: Unclassified
Security Classification System:

Unclassified

Security Handling Description:

None

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: 743073
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=540
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: 743074
Download URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/540/index.html
Distributor:
File Name: Bulk Download
Description:

Simple download of data files.

URLs

URL 1

CC ID: 743076
URL: https://coast.noaa.gov/dataviewer
URL Type:
Online Resource

URL 2

CC ID: 743077
URL: https://coast.noaa.gov
URL Type:
Online Resource

Activity Log

Activity Log 1

CC ID: 690836
Activity Date/Time: 2016-05-23
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 690835
Activity Date/Time: 2017-11-14
Description:

Converted from FGDC Content Standards 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: 718713
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 743075
Activity Date/Time: 2018-03-13
Description:

Partial upload to move data access links to Distribution Info.

Technical Environment

Description:

Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.2.1350

Data Quality

Accuracy:

The expected accuracy of the measured variables is as follows: attitude within 0.07 degree, 3 cm nominal ranging accuracy,

and vertical elevation accuracy of +/-15 cm for the topographic surface. Quality checks are built into the data-processing software.

Horizontal Positional Accuracy:

Raw elevation measurements have been determined to be within 1 meter horizontal accuracy.

Vertical Positional Accuracy:

Elevations are vertically consistent with the point elevation data, +/-15 cm.

Completeness Report:

Several regions of the dataset are labeled as "No Data", which corresponds to a cell value of -32767 m in the LAS file.

These "No Data" areas are a result of the survey not covering a particular region, optical water depth of greater than 1.5 Secchi

disc depths, or the manual removal of lidar processing artifacts.

Conceptual Consistency:

Each file contains data located in a 2 km by 2 km tile, where the upper left bound can be quickly assessed through the file name.

The first 3 numbers in the filename represent the left most UTM easting coordinate (e###000) in meters, the next 4 numbers represent

the top most UTM northing coordinate (n####000) in meters, and the last 2 numbers (##) represent the UTM zone in which the tile is

located (ex. be_e123_n4567_18).

Lineage

Sources

EAARL Coastal TopographyPearl River Delta

CC ID: 1138787
Publish Date: 2008-01-01
Extent Type: Discrete
Extent Start Date/Time: 2008-03-09
Source Contribution:

none | Source Geospatial Form: remote-sensing image | Type of Source Media: Point elevation measurements collected by the EAARL sensor.

Process Steps

Process Step 1

CC ID: 1138788
Description:

The data are collected using a Cessna 310 aircraft. The NASA Experimental Advanced Airborne Research Lidar (EAARL) laser scanner

collects the data using a green (532-nm) raster scanning laser, while a digital camera acquires a visual record of the flight.

The data are stored on hard drives and archived at the U.S. Geological Survey office in St. Petersburg, Florida and the NASA

office at Wallops Flight Facility in Virginia. The navigational data are processed at Wallops Flight Facility. The navigational

and raw data are then downloaded into the Airborne Lidar Processing System (ALPS). Data are converted from units of time to x, y, z

points for elevation. The derived surface data can then be converted into raster data (GeoTIFFs).

Process Date/Time: 2008-08-08 00:00:00

Process Step 2

CC ID: 1138789
Description:

The NOAA Office for Coastal Management (OCM) received files in LAS format. The files contained LiDAR intensity and elevation measurements.

OCM performed the following processing on the data to make it available within Digital Coast:

1. The data were converted from UTM, Zone 16 coordinates to geographic coordinates.

2. The data were converted from NAVD88 heights to ellipsoid heights using Geoid03.

3. The LAS header fields were sorted by latitude and updated.

Process Date/Time: 2010-06-01 00:00:00

Catalog Details

Catalog Item ID: 50109
GUID: gov.noaa.nmfs.inport:50109
Metadata Record Created By: Anne Ball
Metadata Record Created: 2017-11-15 15:24+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