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Short Citation:
OCM Partners, 2022: 2004 USGS/NASA Experimental Advanced Airborne Research Lidar (EAARL): Northern Gulf of Mexico, Post-Hurricane Ivan, https://www.fisheries.noaa.gov/inport/item/50100.

Item Identification

Title: 2004 USGS/NASA Experimental Advanced Airborne Research Lidar (EAARL): Northern Gulf of Mexico, Post-Hurricane Ivan
Short Name: usgs2004_northerngulf_postivan_m1123_metadata
Status: Completed
Publication Date: 2009
Abstract:

ASCII xyz point cloud data were produced from remotely-sensed, geographically-referenced elevation measurements in cooperation with the

U.S. Geological Survey (USGS) and National Air and Space Administration (NASA). 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 kHz or higher results in an extremely dense spatial elevation data set.

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 or John Brock at USGS

Contact Org: Jacobs Technology, contracted to USGS

Title: Computer Scientist

Phone: 727-803-8747

Email: anayegandhi@usgs.gov

Purpose:

The ASCII elevation data can be used to create raster Digital Elevation Models (DEMs). The purpose of this project is to produce highly

detailed and accurate digital elevation maps of the post Hurricane Ivan data for use as a management tool and to make this data available

to natural resource managers and research scientists.

Notes:

10744

Supplemental Information:

Raw lidar data is not in a format that is generally usable by resource managers and scientists. 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 Advanced 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).

The files are in the Quarter Quad tiling format and the exact tile location is contained in the filename at n88_########_mf_be where #######

is the Quarter Quad tile ID.

The development of custom software for creating these data products has been supported by the USGS CMG Program's 'Decision Support for Coastal

Parks, Sanctuaries, and Preserves' project. Processed data products are used by the USGS 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/geoid18/1123/supplemental/2004_USGS_NASA_EAARL_Lidar_Northern_Gulf_Post_Hurricane_Ivan.kmz

Keywords

Theme Keywords

Thesaurus Keyword
ISO 19115 Topic Category
elevation
UNCONTROLLED
None ALPS
None derived surface
None EAARL
None erosion
None Hurricanes
None Ivan
None resource management

Physical Location

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

Data Set Information

Data Set Scope Code: Data Set
Maintenance Frequency: As Needed
Data Presentation Form: LAS
Entity Attribute Overview:

LAS

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 1ns time-resolved return intensity waveform (digital counts). Z value is referenced to

orthometric elevations derived from National Geodetic Survey Geoid Model, Geoid03.

Distribution Liability:

Any conclusions drawn from the analysis of this information are not the responsibility of the USGS, NASA, the Office for Coastal Management

or its partners.

Data Set Credit: The U. S. Geological Survey is providing these data "as is", and the U. S. Geological Survey disclaims any and all warranties, whether expressed or implied, including (without limitation) any implied warranties of merchantability or fitness for a particular purpose. In no event will the U.S. Geological Survey be liable to you or to any third party for any direct, indirect, incidental, consequential, special, or exemplary damages or lost profits resulting from any use or misuse of these data. 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 standad 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 data sets for the same area from other time periods may be inaccurate due to inconsistencies resulting from changes in photo interpretation, 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: 690449
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: 690451
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: 690452
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: 690450
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: 1132659
W° Bound: -88.52451
E° Bound: -84.333193
N° Bound: 30.400043
S° Bound: 29.587063

Extent Group 1 / Time Frame 1

CC ID: 1132658
Time Frame Type: Discrete
Start: 2004-09-19

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.

The U.S. Geological Survey and National Aeronautics and Space Administration request to be acknowledged as originators of this data in future

products or derivative research.

Distribution Information

Distribution 1

CC ID: 743027
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=1123
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: 743028
Download URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/1123/index.html
Distributor:
File Name: Bulk Download
Description:

Simple download of data files.

URLs

URL 1

CC ID: 743030
URL: https://coast.noaa.gov/dataviewer
URL Type:
Online Resource

URL 2

CC ID: 743031
URL: https://coast.noaa.gov
URL Type:
Online Resource

Activity Log

Activity Log 1

CC ID: 690476
Activity Date/Time: 2016-05-23
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 690475
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: 718704
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 743029
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 ArcMap 9.2.2.1350

Data Quality

Accuracy:

The expected accuracy of the measured variables are as follows: attitude within 0.07 degree, 3 cm nominal laser 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 of the DEM 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 GeoTIFF 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:

The files are in the Quarter Quad tiling format and the exact tile location is contained in the filename at n88_########_mf_be where ####### is

the Quarter Quad tile ID. See QQ_naming_convention.doc in the 'extras' directory.

Lineage

Sources

EAARL Coastal Topography- Northern Gulf of Mexico, Post-Hurricane Ivan

CC ID: 1132653
Publish Date: 2008-01-01
Extent Type: Discrete
Extent Start Date/Time: 2004-09-19
Source Contribution:

none | Source Geospatial Form: LAS | Type of Source Media: Point elevation measurements collected by the EAARL sensor.

Process Steps

Process Step 1

CC ID: 1132654
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 (532nm) 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, FISC St. Petersburg office and the NASA office at Wallops Flight Facility. The

navigational data are processed at Wallops Flight Facility. The navigational and raw data are then downloaded into the Advanced 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: 2007-12-01 00:00:00

Process Step 2

CC ID: 1132655
Description:

Metadata imported into ArcCatalog from XML file.

Process Date/Time: 2008-03-10 00:00:00

Process Step 3

CC ID: 1132656
Description:

The NOAA Office for Coastal Management received the data in LAS format. The files contained Lidar elevation and intensity measurements. The data

were projected in UTM coordinates (NAD83; Zone 16N) and referenced to the North American Vertical Datum of 1988 (NAVD88) using the Geoid03 model.

The following processes were performed to make the data available within the Digital Coast:

1. The data were converted from UTM (NAD83; Zone 17N) to geographic coordinates (NAD83).

2. The data were converted from NAVD88 (orthometric) heights to GRS80 (ellipsoidal) heights using the Geoid03 model.

3. The data were reclassified to reflect the ASPRS LAS classifications (1 - unclassified, 2 - bare earth).

4. The LAS data were sorted by latitude and the headers were updated.

Process Date/Time: 2012-01-25 00:00:00

Catalog Details

Catalog Item ID: 50100
GUID: gov.noaa.nmfs.inport:50100
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