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OCM Partners, 2022: 2007 USGS/NPS/NASA Experimental Advanced Airborne Research Lidar (EAARL): Naval Live Oaks Area, FL, https://www.fisheries.noaa.gov/inport/item/50103.

Item Identification

Title: 2007 USGS/NPS/NASA Experimental Advanced Airborne Research Lidar (EAARL): Naval Live Oaks Area, FL
Short Name: usgs2007_liveoaks_m565_metadata
Status: Completed
Publication Date: 2009
Abstract:

ASCII xyz point cloud data were produced from remotely sensed, geographically referenced elevation measurements cooperatively by the

U.S. Geological Survey (USGS), the National Park Service (NPS), and 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 easily surveyed 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: David Nagle

Contact Org: Jacobs Technology, U.S. Geological Survey, St. Petersburg Science Center, St. Petersburg, FL

Title: Programmer/Analyst

Phone: 727-803-8747 (x3093)

Email: dnagle@usgs.gov

Purpose:

The purpose of this project was to produce highly detailed and accurate digital elevation maps and CIR imagery of the Naval Live Oaks Area

in Florida's Gulf Islands National Seashore for use as a management tool and to make these data available to natural-resource managers and research

scientists.

Notes:

10747

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). The

"canopy height" can then be determined by subtracting the "bare earth" elevations from the "first surface" elevations. 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 (ex. be_e123_n4567_16). Once the EAARL

topography data has been processed, the ALPS software can then use it with the raw geopositional and orientation data from the survey to

georeference color-infrared (CIR) imagery co-acquired alongside the lidar data. Each image is first roughly projected into coordinates using a

specialized processing algorithm (in ALPS) that incorporates information from the camera lens parameters, the raw data, and an estimated initial

elevation. The georeferencing is then iteratively improved by using the lidar elevation data in the algorithm until the solution stabilizes. This

georeferencing method creates a worldfile and projection file for each CIR image. Once the imagery has been assessed visually by an operator for

quality issues, the imagery and associated data are then processed using commercial software to mosaic the images into seamless

25-centimeter-resolution images using the 2-kilometer by 2-kilometer tiling scheme described above.

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.

The ASPRS LAS grid is encoded with a 1 meter resolution. The input parameters for the Random Consensus Filter (RCF) were: grid cell size

(buffer) = 6 meters x 6 meters; vertical tolerance (vertical width) = 500 centimeters for first surface and 50 centimeters for bare earth.

See http://pubs.usgs.gov/of/2009/1078/

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

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/565/supplemental/2007_USGS_NPS_NASA_EAARL_Lidar_Naval_Live_Oaks.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
Distribution Liability:

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

or its partners.

Data Set Credit: Acknowledgment of the U.S. Geological Survey, St. Petersburg 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 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: 690566
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: 690568
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: 690569
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: 690567
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: 1139081
W° Bound: -87.166508
E° Bound: -87.104073
N° Bound: 30.389941
S° Bound: 30.353783

Extent Group 1 / Time Frame 1

CC ID: 1139080
Time Frame Type: Discrete
Start: 2007-06-30

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, National Park Service, 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: 743042
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=565
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: 743043
Download URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/565/index.html
Distributor:
File Name: Bulk Download
Description:

Simple download of data files.

URLs

URL 1

CC ID: 743045
URL: https://coast.noaa.gov/dataviewer
URL Type:
Online Resource

URL 2

CC ID: 743046
URL: https://coast.noaa.gov
URL Type:
Online Resource

Activity Log

Activity Log 1

CC ID: 690590
Activity Date/Time: 2016-05-23
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 690589
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: 718707
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 743044
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

Data Quality

Accuracy:

The expected accuracy of the measured variables is as follows: attitude within 0.07 degree, 3-centimeter 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". 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-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 (ex. fs_e123_n4567_16).

Lineage

Process Steps

Process Step 1

CC ID: 1139077
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-nanometer) 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. The processing took place from 20070630 through 20090720.

Process Date/Time: 2009-07-20 00:00:00

Process Step 2

CC ID: 1139078
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 16N) 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 a bare earth surface (class 0 to class 2).

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

Process Date/Time: 2001-04-02 00:00:00

Catalog Details

Catalog Item ID: 50103
GUID: gov.noaa.nmfs.inport:50103
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