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Short Citation:
OCM Partners, 2022: 2004 USGS/NASA Experimental Advanced Airborne Research Lidar (EAARL): Western Florida, Post-Hurricane Charley (Seamless Topo-Bathy), https://www.fisheries.noaa.gov/inport/item/50101.

Item Identification

Title: 2004 USGS/NASA Experimental Advanced Airborne Research Lidar (EAARL): Western Florida, Post-Hurricane Charley (Seamless Topo-Bathy)
Short Name: usgs2004_west_florida_post_charley_m1076_metadata
Status: Completed
Publication Date: 2009
Abstract:

A seamless (bare-earth and submerged) elevation map (also known as a Digital Elevation Model, or DEM) of a portion of western Florida,

post-Hurricane Charley, was produced from remotely sensed, geographically referenced elevation measurements cooperatively by the

U.S. Geological Survey (USGS) and the National Aeronautics 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 kilohertz or higher results in an extremely dense spatial elevation dataset.

Over 100 kilometers of coastline can be surveyed easily within a 3- to 4-hour mission. 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, U.S. Geological Survey, CMGP, St. Petersburg, FL

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 seamless elevation map of a portion of western Florida,

post-Hurricane Charley for use as a management tool and to make these data available to natural-resource managers and research scientists.

Notes:

10745

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 Program (CMGP) 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. The zero

crossing of the second derivative (that is, detection of local maxima) is used to detect "first surface" topography, while the trailing edge

algorithm (that is, the algorithm searches for the location prior to the last return where direction changes along the trailing edge) is used

to detect the range to the last return, or "bare earth." Statistical filtering, known as the Random Consensus Filter (RCF), is used to remove

false bottom returns and other outliers from the EAARL topography data. The filter uses a grid of non-overlapping square cells (buffer) of

user-defined size overlaid onto the original point cloud. The user also defines the vertical tolerance (vertical width) based on the

topographic complexity and point sampling density of the data. The maximum allowable elevation range within a cell is established by this

vertical tolerance. An iterative process searches for the maximum concentration of points within the vertical tolerance and removes those

points outside of the tolerance (Nayegandhi and others, 2009). These data are then converted to the North American Datum of 1983 and the

North American Vertical Datum of 1988 (using the GEOID03 model). Each file contains data located in a 2-kilometer by 2-kilometer tile,

where the upper-left bound can be assessed quickly through the filename. 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 (for example, sm_e123_n4567_17).

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/geoid18/1076/supplemental/2004_USGS_NASA_EAARL_Lidar_West_Florida_Post_Hurricane_Charley.kmz

Keywords

Theme Keywords

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

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:

LAS

Entity Attribute Detail Citation:

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

degrees), scan angle (degrees), second of the epoch (seconds), and 1-nanosecond 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: Acknowledgment of the U.S. Geological Survey, Coastal and Marine Geology Program, as a data source would be appreciated in products developed from these data, and such acknowledgment as is standard for citation and legal practices for data source is expected. Sharing of 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: 690489
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: 690491
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: 690492
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: 690490
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: 1132427
W° Bound: -82.452251
E° Bound: -82.013156
N° Bound: 27.074949
S° Bound: 26.419666

Extent Group 1 / Time Frame 1

CC ID: 1132426
Time Frame Type: Range
Start: 2004-08-17
End: 2004-08-18

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: 743032
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=1076
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: 743033
Download URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/1076/index.html
Distributor:
File Name: Bulk Download
Description:

Simple download of data files.

URLs

URL 1

CC ID: 743035
URL: https://coast.noaa.gov/dataviewer
URL Type:
Online Resource

URL 2

CC ID: 743036
URL: https://coast.noaa.gov
URL Type:
Online Resource

Activity Log

Activity Log 1

CC ID: 690517
Activity Date/Time: 2016-05-23
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 690516
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: 718705
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 743034
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 centimeters nominal ranging accuracy, and

vertical elevation accuracy of +/-15 centimeters 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 in horizontal accuracy.

Vertical Positional Accuracy:

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

Completeness Report:

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

These "No Data" areas are a result of the survey not covering a particular region (for example, behind the beachface), optical water depth

of greater than 1.5 Secchi disc depths, or the manual removal of lidar processing artifacts. The presence of "No Data" values does

not necessarily indicate an absence of land, rather an absence of survey coverage.

Conceptual Consistency:

Each file contains data located in a 2-kilometer by 2-kilometer tile where the upper-left bound can be assessed quickly through the filename.

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 (for example,

sm_e123_n4567_17).

Lineage

Sources

EAARL Coastal Topography- Western Florida, post-Hurricane Charley 2004

CC ID: 1132421
Publish Date: 2009-01-01
Extent Type: Range
Extent Start Date/Time: 2004-08-17
Extent End Date/Time: 2004-08-18
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: 1132422
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-nanometers) 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: 2009-01-01 00:00:00

Process Step 2

CC ID: 1132423
Description:

Metadata imported into ArcCatalog from XML file.

Process Date/Time: 2009-07-31 00:00:00

Process Step 3

CC ID: 1132424
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 17N) 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 bare earth classification.

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

Process Date/Time: 2011-10-25 00:00:00

Catalog Details

Catalog Item ID: 50101
GUID: gov.noaa.nmfs.inport:50101
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