EAARL Coastal Topography–Texas, Post-Hurricane Ike, 2008: Bare Earth

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 20170901
Title:
EAARL Coastal Topography–Texas, Post-Hurricane Ike, 2008: Bare Earth
Edition: first
Geospatial_Data_Presentation_Form: XYZ point cloud data
Series_Information:
Series_Name: U.S. Geological Survey Data Release
Issue_Identification: doi:10.5066/F74X56N2
Publication_Information:
Publication_Place: St. Petersburg, FL
Publisher: U.S. Geological Survey
Online_Linkage: https://coastal.er.usgs.gov/data-release/doi-F74X56N2
Description:
Abstract:
ASCII XYZ point cloud data were produced from remotely sensed, geographically referenced elevation measurements by the U.S. Geological Survey (USGS). Elevation measurements were collected over a portion of the Texas coastline, post-Hurricane Ike (September 2008 hurricane), using the 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 60 meters per second at an elevation of approximately 300 meters, resulting in a laser swath of approximately 240 meters with an average point spacing of 2-3 meters. The EAARL, developed originally by the National Aeronautics and Space Administration (NASA) at Wallops Flight Facility in Virginia, measures ground elevation with a vertical resolution of 3 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 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 provide highly detailed and accurate elevation data of coastal parks and barrier islands, post-Hurricane Ike (September 2008 hurricane), for use as a management tool and to make these data available to natural-resource managers and research scientists. To ensure that St. Petersburg Coastal and Marine Science Center (SPCMSC) data management protocols were followed, this survey was assigned a USGS field activity number (FAN), 08CCH03. Additional survey and data details are available at https://cmgds.marine.usgs.gov/fan_info.php?fan=08CCH03.
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 USGS's Coastal and Marine Geology Program (CMGP) has developed custom software to convert raw lidar data into a geographic information system (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 originally 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 "first returns" are indicative of vegetation-canopy height, or bare ground in the absence of vegetation, whereas "last returns" typically represent "bare-earth" elevations under vegetation. The terms first surface and bare earth refer to the digital elevation data of the terrain, but while 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, 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" (the first and last returns being the first and last significant measurable portion 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 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 (NAD83) and the North American Vertical Datum of 1988 (NAVD88). The development of custom software for creating these data products has been supported by the USGS CMGP's Lidar for Science and Resource Management project. Processed data products are used by the USGS CMGP's National Assessment 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.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 20080917
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -96.6862198889
East_Bounding_Coordinate: -93.7925043889
North_Bounding_Coordinate: 29.6853113056
South_Bounding_Coordinate: 28.4177526111
Keywords:
Theme:
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:4a9ee27d-5eed-4723-b7d9-1da168e8c379
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: elevation
Theme:
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: remote sensing
Theme_Keyword: geomorphology
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: Airborne Lidar Processing System
Theme_Keyword: ALPS
Theme_Keyword: EAARL
Theme_Keyword: Experimental Advanced Airborne Research Lidar
Theme_Keyword: laser altimetry
Theme_Keyword: lidar
Theme_Keyword: topography
Theme_Keyword: USGS National Assessment Project
Theme_Keyword: ASCII XYZ (Bare earth)
Theme:
Theme_Keyword_Thesaurus: Global Change Master Science Directory
Theme_Keyword: LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION
Theme_Keyword: OCEAN > COASTAL PROCESSES > BARRIER ISLANDS
Theme_Keyword: OCEAN > COASTAL PROCESSES > BEACHES
Theme_Keyword: OCEAN > COASTAL PROCESSES > SHORELINE DISPLACEMENT
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
Place:
Place_Keyword_Thesaurus: Geographic Names Information System
Place_Keyword: Texas
Place_Keyword: Gulf of Mexico
Stratum:
Stratum_Keyword_Thesaurus: None
Stratum_Keyword: Bare earth
Temporal:
Temporal_Keyword_Thesaurus: None
Temporal_Keyword: 2008
Temporal_Keyword: Post-Hurricane Ike
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: U.S. Geological Survey
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: 772 502-8086
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 USGS 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 USGS 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.
Security_Information:
Security_Classification_System: Unclassified
Security_Classification: Unclassified
Security_Handling_Description: None
Native_Data_Set_Environment:
Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.3.1.4959
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: 30(4), p. 861-878
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The expected accuracy of the measured variables is as follows: attitude within 0.07 degree and 3 centimeters nominal ranging accuracy. Quality checks are built into the data processing software.
Logical_Consistency_Report:
These data were processed for topography ONLY; offshore elevations are invalid.
Completeness_Report:
These point cloud data may appear sparse or nonexistent, which is a result of automated filtering or lack of survey coverage.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Raw elevation measurements have been determined to be within 1 meter in horizontal accuracy.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
When the EAARL bare earth data were compared to NOAA National Geodetic Survey (NGS) ground control points, the offset was 0.20 +/- 0.21m.
Lineage:
Process_Step:
Process_Description:
The data were collected using a Cessna 310 aircraft. The EAARL 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 USGS office in St. Petersburg, Florida. Raw EAARL waveform, GPS, and Inertial Measurement Unit (IMU) data were subsequently loaded into ALPS software. ALPS (v. 1.55) interactively processed small sections of the data to obtain best estimates of aircraft pitch and roll biases.
Process_Date: 20080917
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Christine Kranenburg
Contact_Organization:
Cherokee Nation Technologies, U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center, St. Petersburg, FL
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: 772 502-8129
Contact_Electronic_Mail_Address: ckranenburg@usgs.gov
Hours_of_Service: M-F, 8:00-4:00 ET
Process_Step:
Process_Description:
ALPS (20111026) was used to batch process the raw data for last return and first return topography. Next, it batch filtered the bare earth topography using the RCF. The input parameters of the random consensus filter were: grid cell size (buffer) = 600 cm x 600 cm; vertical tolerance (vertical width) = 80 cm.
Process_Date: 20111026
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Christine Kranenburg
Contact_Organization:
Cherokee Nation Technologies, U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center, St. Petersburg, FL
Contact_Position: Computer Scientist
Contact_Address:
Address_Type: Physical and Mailing
Address: 600 4th Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA
Contact_Voice_Telephone: (727) 502-8129
Contact_Electronic_Mail_Address: ckranenburg@usgs.gov
Process_Step:
Process_Description:
ALPS (20170629) was used to convert bare earth topography from the WGS 84 datum to NAD83, NAVD88 using the GEOID96 model. Lastly, ALPS exported the NAD83, NAVD88 (GEOID96) bare earth topography from .pbd format to an ASCII XYZ file. The final .xyz file consists of three columns: longitude, latitude, and elevation.
Process_Date: 20170629
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Matthew Hardy
Contact_Organization:
Cherokee Nation Technologies, U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center, St. Petersburg, FL
Contact_Position: GIS Specialist
Contact_Address:
Address_Type: Physical and Mailing
Address: 600 4th Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA
Contact_Voice_Telephone: (727) 502-8082
Contact_Electronic_Mail_Address: mwhardy@usgs.gov
Process_Step:
Process_Description:
Added keywords section with USGS persistent identifier as theme keyword.
Process_Date: 20201013
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: VeeAnn A. Cross
Contact_Position: Marine Geologist
Contact_Address:
Address_Type: Mailing and Physical
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: 508-548-8700 x2251
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Point
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 0.00001
Longitude_Resolution: 0.00001
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 (GEOID96)
Altitude_Resolution: 0.2
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: IKE2008_Texas_EAARLA_BE_n88g96.xyz
Entity_Type_Definition: The file is .xyz ASCII comma-delimited.
Entity_Type_Definition_Source: Internally devised to maintain naming consistency.
Attribute:
Attribute_Label: X
Attribute_Definition: Longitude in decimal degrees
Attribute_Definition_Source: NAD 83
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -96.6862198889
Range_Domain_Maximum: -93.7925043889
Attribute:
Attribute_Label: Y
Attribute_Definition: Latitude in decimal degrees
Attribute_Definition_Source: NAD 83
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 28.4177526111
Range_Domain_Maximum: 29.6853113056
Attribute:
Attribute_Label: Z
Attribute_Definition: Elevation in meters
Attribute_Definition_Source: NAVD 88 (GEOID96)
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -24.74
Range_Domain_Maximum: 382.62
Overview_Description:
Entity_and_Attribute_Overview:
This file consists of bare earth elevation data available for this survey. Data has been processed via the ALPS processing software. Data has been quality controlled though the application of the RCF in ALPS but has not undergone manual editing. Data has been converted from WGS84 to NAD83, NAVD88 (GEOID96).
Entity_and_Attribute_Detail_Citation: http://pubs.usgs.gov/of/2009/1078/
Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Xan Fredericks
Contact_Organization: U.S. Geological Survey
Contact_Position: Cartographer/Lidar Coordinator
Contact_Address:
Address_Type: Physical and Mailing
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
Resource_Description: IKE2008_Texas_EAARLA_BE_n88g96.xyz
Distribution_Liability:
Although these data have been processed successfully on a computer system at the 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 and/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: Access_Instructions: Available Online
Fees: None
Metadata_Reference_Information:
Metadata_Date: 20201013
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Matthew Hardy
Contact_Organization:
Cherokee Nation Technologies, U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center, St. Petersburg, FL
Contact_Position: GIS Specialist
Contact_Address:
Address_Type: Physical and Mailing
Address: 600 4th Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA
Contact_Voice_Telephone: (727) 502-8082
Contact_Electronic_Mail_Address: mwhardy@usgs.gov
Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time

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