EAARL Coastal Topography—Chandeleur Islands, Louisiana, 12-13 February 2011: Seamless (Bare Earth and Submerged)

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 20160502
Title:
EAARL Coastal Topography—Chandeleur Islands, Louisiana, 12-13 February 2011: Seamless (Bare Earth and Submerged)
Edition: first
Geospatial_Data_Presentation_Form: tabular digital data
Series_Information:
Series_Name: U.S. Geological Survey Data Release
Issue_Identification: doi:10.5066/F7930R84
Publication_Information:
Publication_Place: St. Petersburg, FL
Publisher: U.S. Geological Survey
Online_Linkage: https://doi.org/10.5066/F7930R84
Description:
Abstract:
ASCII XYZ point-cloud data for the Chandeleur Islands in Louisiana were produced from remotely sensed, geographically referenced elevation measurements collected on February 12 and 13, 2011 by the U.S. Geological Survey. Elevation measurements were collected over the area using the first-generation Experimental Advanced Airborne Research Lidar (EAARL-A), 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 55 meters per second at an elevation of approximately 300 meters, resulting in a laser swath of approximately 240 meters. More than 100 kilometers of coastline can be surveyed easily within a 3- to 4-hour mission. When resultant elevation maps for an area are analyzed, they provide a useful tool to make management decisions regarding land development.
Purpose:
The purpose of this project was to produce a highly detailed and accurate digital elevation map for the Chandeleur Islands in Louisiana for use as a management tool and to make these data available to natural-resource managers and research scientists. To ensure that SPCMSC data management protocols were followed, this survey was assigned a USGS field activity number (FAN), 11LTS01. Additional survey and data details are available at http://cmgds.marine.usgs.gov/fan_info.php?fan=11LTS01.
Supplemental_Information:
Raw lidar data are not in a format that is generally usable by natural-resource managers and research 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 multitiered processing system developed originally by a USGS-NASA collaborative project. Specialized processing algorithms are used to convert raw waveform lidar data acquired by the EAARL-A to georeferenced spot (x,y,z) returns for "first surface" and "bare earth" topography. The terms first surface and bare earth refer to the digital elevation data of the terrain, although first-surface data include vegetation, buildings, and other manmade structures, bare-earth data do not. The zero crossing of the second derivative (that is, detection of stationary points) is used to detect the first return, resulting in "first surface" topography, whereas the trailing edge algorithm (that is, the algorithm searches for the location before the last return where direction changes along the trailing edge) is used to detect the range to the last return, or "bare earth" (the first and last returns being the first and last significant measurable part of the return pulse). Statistical filtering, known as the Random Consensus Filter (RCF), is used to remove false bottom returns and other outliers from the EAARL-A 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 GEOID96 model); please note that these data are not suitable for determining absolute elevation measurements.
Time_Period_of_Content:
Time_Period_Information:
Multiple_Dates/Times:
Single_Date/Time:
Calendar_Date: 20110212
Single_Date/Time:
Calendar_Date: 20110213
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -88.90294180
East_Bounding_Coordinate: -88.81464840
North_Bounding_Coordinate: 30.05166150
South_Bounding_Coordinate: 29.74458660
Keywords:
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: elevation
Theme:
Theme_Keyword_Thesaurus: General
Theme_Keyword: Airborne Lidar Processing System
Theme_Keyword: ALPS
Theme_Keyword: EAARL-A
Theme_Keyword: Experimental Advanced Airborne Research Lidar
Theme_Keyword: laser altimetry
Theme_Keyword: lidar
Theme_Keyword: Pilatus PC-6
Theme_Keyword: remote sensing
Theme_Keyword: topography
Theme:
Theme_Keyword_Thesaurus: Global Change Master Science Directory
Theme_Keyword: LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION
Theme_Keyword:
DOI/USGS/CMG > COASTAL AND MARINE GEOLOGY, U.S. GEOLOGICAL SURVEY, U.S. DEPARTMENT OF INTERIOR
Theme:
Theme_Keyword_Thesaurus: GCMD Instrument
Theme_Keyword: LIDAR > LIGHT DETECTION AND RANGING
Theme:
Theme_Keyword_Thesaurus: Data Categories for Marine Planning
Theme_Keyword: distributions
Theme_Keyword: bathymetry and elevation
Theme:
Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) Keywords
Theme_Keyword: altimetry
Theme_Keyword: topographic mapping
Theme:
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: LIDAR
Theme_Keyword: topography
Theme_Keyword: digital elevation models
Place:
Place_Keyword_Thesaurus: Geographic Names Information System
Place_Keyword: Chandeleur Islands
Place_Keyword: Louisiana
Place_Keyword: St. Bernard Parish
Place_Keyword: Gulf of Mexico
Stratum:
Stratum_Keyword_Thesaurus: General
Stratum_Keyword: Bare Earth
Stratum_Keyword: Submerged
Temporal:
Temporal_Keyword_Thesaurus: General
Temporal_Keyword: 2011
Access_Constraints: None
Use_Constraints:
Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. The U.S. Geological Survey requests to be acknowledged as originator of these data in future products or derivative research.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Xan Fredericks
Contact_Organization:
Cherokee Nation Technologies, U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center, St. Petersburg, FL
Contact_Position: Lidar Validation and Processing Analyst
Contact_Address:
Address_Type: mailing and physical address
Address: 600 4th Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA
Contact_Voice_Telephone: 727 502-8086
Contact_Facsimile_Telephone: 727 502-8182
Contact_Electronic_Mail_Address: afredericks@usgs.gov
Hours_of_Service: M-F, 8:00-4:00 ET
Data_Set_Credit:
Acknowledgment of the U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center, 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 periods may be inaccurate because of 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.
Security_Information:
Security_Classification_System: Unclassified
Security_Classification: Unclassified
Security_Handling_Description: None
Native_Data_Set_Environment:
Microsoft Windows 7 Enterprise Service Pack 1; Esri ArcCatalog 10.2.2.3552
Cross_Reference:
Citation_Information:
Originator: Nayegandhi, A., Brock, J.C., and Wright, C.W.
Publication_Date: 2009
Title:
Small footprint, waveform-resolving lidar estimation of submerged and subcanopy topography in coastal environments
Series_Information:
Series_Name: International Journal of Remote Sensing
Issue_Identification: v. 30 no. 4, p. 861-878
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The expected accuracy of the measured variables is as follows: attitude within 0.05 degree and 3 centimeters nominal ranging accuracy. Quality checks are built into the data-processing software.
Logical_Consistency_Report:
Data cover area specified for this project without known issues.
Completeness_Report:
These point-cloud data may appear sparse or nonexistent, which may be a result of lack of survey coverage, manual removal of lidar processing artifacts, turbidity, or dense vegetation.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Raw lidar measurements have been determined to be within 1 meter in horizontal accuracy.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
The nominal vertical elevation accuracy expressed as the root mean square error (RMSE) is less than 10 centimeters for the bare-earth topography and less than 35 centimeters for the submerged topography. Vertical accuracies may differ based on the type of terrain and the accuracy of the GPS and aircraft-attitude measurements.
Lineage:
Process_Step:
Process_Description:
The data were collected using a Pilatus PC-6 aircraft. The EAARL-A laser scanner collects the data using a green-wavelength (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. The navigational data are processed and then, along with the raw data, are downloaded into ALPS, or the Airborne Lidar Processing System (20110212-20110331). Data are converted from units of time to x,y,z points for elevation, which are then manually edited and quality checked to ensure anomalies and noise have been addressed to specification.
Process_Date: 20110331
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Xan Fredericks
Contact_Organization:
Cherokee Nation Technologies, U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center, St. Petersburg, FL
Contact_Position: Lidar Validation and Processing Analyst
Contact_Address:
Address_Type: mailing and physical address
Address: 600 4th Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA
Contact_Voice_Telephone: 727 502-8086
Contact_Electronic_Mail_Address: afredericks@usgs.gov
Hours_of_Service: M-F, 8:00-4:00 ET
Process_Step:
Process_Description: Metadata imported into ArcCatalog 10.2.2.3552 from XML file.
Process_Date: 20160308
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Xan Fredericks
Contact_Organization:
Cherokee Nation Technologies, U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center, St. Petersburg, FL
Contact_Position: Lidar Validation and Processing Analyst
Contact_Address:
Address_Type: mailing and physical address
Address: 600 4th Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA
Contact_Voice_Telephone: 727 502-8086
Contact_Electronic_Mail_Address: afredericks@usgs.gov
Hours_of_Service: M-F, 8:00-4:00 ET
Process_Step:
Process_Description:
Keywords section of metadata optimized for discovery in USGS Coastal and Marine Geology Data Catalog.
Process_Date: 20170104
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Alan O. Allwardt
Contact_Position: Contractor -- Information Specialist
Contact_Address:
Address_Type: mailing and physical address
Address: 2885 Mission Street
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060
Contact_Voice_Telephone: 831-460-7551
Contact_Facsimile_Telephone: 831-427-4748
Contact_Electronic_Mail_Address: aallwardt@usgs.gov
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Point
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 1e-07
Longitude_Resolution: 1e-07
Geographic_Coordinate_Units: Decimal degrees
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137.000000
Denominator_of_Flattening_Ratio: 298.25722210100002
Vertical_Coordinate_System_Definition:
Altitude_System_Definition:
Altitude_Datum_Name: North American Vertical Datum of 1988
Altitude_Resolution: 0.20
Altitude_Distance_Units: meters
Altitude_Encoding_Method:
Explicit elevation coordinate included with horizontal coordinates
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: CHAN2011_EAARLA_SM_n88g96.xyz
Entity_Type_Definition: This file is a .xyz, provided in ASCII comma-delimited format.
Entity_Type_Definition_Source: Internally devised to maintain naming consistency.
Attribute:
Attribute_Label: Longitude
Attribute_Definition: Decimal Degrees
Attribute_Definition_Source: NAD 83
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -88.90294180
Range_Domain_Maximum: -88.81464840
Attribute:
Attribute_Label: Latitude
Attribute_Definition: Decimal Degrees
Attribute_Definition_Source: North American Datum of 1983
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 29.74458660
Range_Domain_Maximum: 30.05166150
Attribute:
Attribute_Label: Elevation
Attribute_Definition: Elevation in meters
Attribute_Definition_Source: North American Vertical Datum of 1988 (GEOID96)
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -4.86
Range_Domain_Maximum: 3.07
Attribute:
Attribute_Label: Time
Attribute_Definition: Time in seconds of epoch
Attribute_Definition_Source: Seconds of epoch (seconds since January 1, 1970)
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1297543638.4449
Range_Domain_Maximum: 1297622845.6928
Overview_Description:
Entity_and_Attribute_Overview:
The input parameters for the random consensus filter (RCF) were: grid cell size (buffer) = 500 centimeters x 500 centimeters; vertical tolerance (vertical width) = 40 centimeters.
Entity_and_Attribute_Detail_Citation: http://pubs.usgs.gov/of/2009/1078/
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Xan Fredericks
Contact_Position:
Lidar Validation and Processing Analyst, Cherokee Nation Technologies
Contact_Address:
Address_Type: mailing and physical address
Address: 600 4th Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA
Contact_Voice_Telephone: 727 502-8086
Hours_of_Service: M-F, 8:00-4:00 ET
Resource_Description: CHAN2011_EAARLA_SM_n88g96.xyz
Distribution_Liability:
Although these data have been processed successfully on a computer system at the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system, or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. The USGS shall not be held liable for improper or incorrect use of the data described or contained herein. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: ASCII
Format_Version_Number: 1
Format_Specification: XYZ
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Fees: None
Ordering_Instructions: Contact U.S. Geological Survey.
Turnaround: Vary
Custom_Order_Process: Contact U.S. Geological Survey for details.
Metadata_Reference_Information:
Metadata_Date: 20170803
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Xan Fredericks
Contact_Organization:
Cherokee Nation Technologies, U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center, St. Petersburg, FL
Contact_Position: Lidar Validation and Processing Analyst
Contact_Address:
Address_Type: mailing and physical address
Address: 600 4th Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA
Contact_Voice_Telephone: 727 502-8086
Contact_Electronic_Mail_Address: afredericks@usgs.gov
Hours_of_Service: M-F, 8:00-4:00 ET
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time

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