EAARL-B Topography-Big Thicket National Preserve: Big Sandy Creek Unit, Texas, 2014

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 20150917
Title:
EAARL-B Topography-Big Thicket National Preserve: Big Sandy Creek Unit, Texas, 2014
Edition: first
Geospatial_Data_Presentation_Form: raster digital data
Series_Information:
Series_Name: U.S. Geological Survey Data Release
Issue_Identification: doi:10.5066/F7BC3WK1
Publication_Information:
Publication_Place: St. Petersburg, FL
Publisher: U.S. Geological Survey
Online_Linkage: https://doi.org/10.5066/F7BC3WK1
Description:
Abstract:
A first-surface topography digital elevation model (DEM) mosaic for the Big Sandy Creek Unit of Big Thicket National Preserve in Texas, was produced from remotely sensed, geographically referenced elevation measurements collected on January 19, 21, 22, and 30, 2014 by the U.S. Geological Survey, in cooperation with the National Park Service - Gulf Coast Network. Elevation measurements were collected over the area using the second-generation Experimental Advanced Airborne Research Lidar, 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 with an average point spacing of 0.5-1.6 meters. A peak sampling rate of 15-30 kilohertz results in an extremely dense spatial elevation dataset. 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 Big Sandy Creek Unit of Big Thicket National Preserve in Texas, 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), 13LTS02. Additional survey and data details are available at http://cmgds.marine.usgs.gov/fan_info.php?fan=13LTS02.
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-B 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-B 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 GEOID12A model); please note that these data are not suitable for navigational use, nor for determining absolute elevation measurements.
Time_Period_of_Content:
Time_Period_Information:
Multiple_Dates/Times:
Single_Date/Time:
Calendar_Date: 20140119
Single_Date/Time:
Calendar_Date: 20140121
Single_Date/Time:
Calendar_Date: 20140122
Single_Date/Time:
Calendar_Date: 20140130
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -94.75455499
East_Bounding_Coordinate: -94.60573316
North_Bounding_Coordinate: 30.72291169
South_Bounding_Coordinate: 30.55869001
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: Cessna 310
Theme_Keyword: Digital Elevation Model
Theme_Keyword: DEM
Theme_Keyword: EAARL-B
Theme_Keyword: Experimental Advanced Airborne Research Lidar
Theme_Keyword: laser altimetry
Theme_Keyword: lidar
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: Big Thicket National Preserve
Place_Keyword: Big Sandy Creek Unit
Place_Keyword: Polk County
Place_Keyword: Texas
Stratum:
Stratum_Keyword_Thesaurus: General
Stratum_Keyword: First Surface
Temporal:
Temporal_Keyword_Thesaurus: General
Temporal_Keyword: 2014
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 Technology Solutions, 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 10.1.1.3143
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: These data are located in UTM Zone 15.
Completeness_Report:
Missing areas are represented by a "no data" value of -32,767 and are a result of the survey not covering a particular region or the manual removal of lidar processing artifacts.
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:
Typical vertical elevation accuracies for these data are consistent with the point elevation data; however, a ground-control survey is not completed simultaneously with every lidar survey. 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 Cessna 310 aircraft. The EAARL-B 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 (20140119-20140917). 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. The derived surface data are then converted into raster data (GeoTIFF), which are mosaicked using ERDAS Imagine 2014 (20150908).
Process_Date: 20150908
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Xan Fredericks
Contact_Organization:
Cherokee Nation Technology Solutions, 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 10.1.1.3143 from XML file.
Process_Date: 20150908
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Xan Fredericks
Contact_Organization:
Cherokee Nation Technology Solutions, 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:
Indirect_Spatial_Reference: Tiling Index
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Pixel
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: Universal Transverse Mercator
Universal_Transverse_Mercator:
UTM_Zone_Number: 15
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.999600
Longitude_of_Central_Meridian: -93.000000
Latitude_of_Projection_Origin: 0
False_Easting: 500000.000000
False_Northing: 0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: row and column
Coordinate_Representation:
Abscissa_Resolution: 2.500000
Ordinate_Resolution: 2.500000
Planar_Distance_Units: meters
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:
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) = 1500 centimeters. Each pixel of the encoded GeoTIFF has an explicit elevation value associated with it. The GeoTIFF grid, which is provided at a 2.5-meter horizontal resolution, is encoded with the interpolated elevation value. The GeoTIFFs are created using Delauney triangulation, followed by linear interpolation based on the routines in the Exelis Visual Information Solutions Interactive Data Language (IDL) code. The GeoTIFFs were mosaicked using ERDAS Imagine 2014 Mosaic Pro.
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 Technology Solutions
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: BITH2014_BigSandyCreekUnit_EAARLB_FS_z15_n88g12A_mosaic.tif
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: GeoTIFF
Format_Version_Number: 2
Format_Specification: GeoTIFF
Digital_Transfer_Option:
Online_Option:
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: 20170727
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Xan Fredericks
Contact_Organization:
Cherokee Nation Technology Solutions, 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
Metadata_Extensions:
Online_Linkage: http://www.esri.com/metadata/esriprof80.html
Profile_Name: Esri Metadata Profile

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