EAARL-B Submerged Topography - Saint Croix and Saint Thomas, U.S. Virgin Islands, 2014
Office for Coastal Management
Data Set
(DS)
| ID: 48140
| Published / External
Created: 2017-11-14
|
Last Modified: 2023-10-17
Project (PRJ) | ID: 37231
ID: 48140
Data Set (DS)
* Discovery• First Pass
» Metadata Rubric
Item Identification
* » Title | EAARL-B Submerged Topography - Saint Croix and Saint Thomas, U.S. Virgin Islands, 2014 |
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Short Name | 2014_EAARLB_StCroix_StThomas_m4940_metadata |
* Status | Completed |
Creation Date | |
Revision Date | |
• Publication Date | 2015-07-25 |
* » Abstract |
Binary point-cloud data for part of the submerged environs of Saint Croix and Saint Thomas, U.S. Virgin Islands, were produced from remotely sensed, geographically referenced elevation measurements by the U.S. Geological Survey in collaboration with the National Oceanic and Atmospheric Administration's Coral Reef Conservation Program. 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. The nominal vertical elevation accuracy expressed as the root mean square error (RMSE) is 13.5 centimeters on Saint Croix. Data were insufficient to calculate the nominal vertical elevation accuracy expressed as the root mean square error (RMSE) on Saint Thomas. 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. Original contact information: Contact Name: Xan Fredericks Contact Org: Cherokee Nation Technology Solutions, U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center, St. Petersburg, FL Title: Lidar Validation and Processing Analyst Phone: 727 502-8086 Email: afredericks@usgs.gov |
* Purpose |
The purpose of this project was to produce highly detailed and accurate seamless digital elevation maps for part of the submerged environs of Saint Croix and Saint Thomas, U.S. Virgin Islands, for use as a management tool and to make these data available to natural-resource managers and research scientists. |
Notes |
10163 |
Other Citation Details | |
• 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 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-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, but although first-surface data include vegetation, buildings, and other man-made 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). Funding was from the NOAA Coral Reef Conservation Program. |
DOI (Digital Object Identifier) | |
DOI Registration Authority | |
DOI Issue Date |
Keywords
Theme Keywords
Thesaurus | Keyword |
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Global Change Master Directory (GCMD) Science Keywords | EARTH SCIENCE > LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION > TOPOGRAPHICAL RELIEF MAPS |
Global Change Master Directory (GCMD) Science Keywords | EARTH SCIENCE > OCEANS > BATHYMETRY/SEAFLOOR TOPOGRAPHY > SEAFLOOR TOPOGRAPHY |
Global Change Master Directory (GCMD) Science Keywords | EARTH SCIENCE > OCEANS > COASTAL PROCESSES > COASTAL ELEVATION |
ISO 19115 Topic Category | elevation |
CoRIS Discovery Thesaurus | Geographic Information > LiDAR |
CoRIS Theme Thesaurus | EARTH SCIENCE > Land Surface > Topography> Terrain Elevation |
CoRIS Theme Thesaurus | EARTH SCIENCE > Oceans > Bathymetry/Seafloor Topography > Bathymetry |
General | Airborne Lidar Processing System |
General | ALPS |
General | Cessna 310 |
General | DEM |
General | Digital Elevation Model |
General | EAARL-B |
General | Experimental Advanced Airborne Research Lidar |
General | laser altimetry |
General | lidar |
General | remote sensing |
General | topography |
Global Change Master Science Directory | DOI/USGS/CMG > COASTAL AND MARINE GEOLOGY |
Global Change Master Science Directory | OCEAN > BATHYMETRY/SEAFLOOR TOPOGRAPHY > SEAFLOOR TOPOGRAPHY |
Global Change Master Science Directory | OCEAN > COASTAL PROCESSES > COASTAL ELEVATION |
Global Change Master Science Directory | U.S. DEPARTMENT OF INTERIOR |
Global Change Master Science Directory | U.S. GEOLOGICAL SURVEY |
Temporal Keywords
Thesaurus | Keyword |
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General | 2014 |
* Spatial Keywords
Thesaurus | Keyword |
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Global Change Master Directory (GCMD) Location Keywords | OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN > CARIBBEAN SEA > VIRGIN ISLANDS |
CoRIS Place Thesaurus | COUNTRY/TERRITORY > United States of America > U. S. Virgin Islands > U. S. Virgin Islands > U. S. Virgin Islands (17N064W0000) |
CoRIS Place Thesaurus | OCEAN BASIN > Atlantic Ocean > Caribbean Sea > Virgin Islands > Lesser Antilles > U. S. Virgin Islands (17N064W0000) |
Geographic Names Information System | Caribbean |
Geographic Names Information System | Saint Croix |
Geographic Names Information System | Saint Thomas |
Geographic Names Information System | U.S. Virgin Islands |
Stratum Keywords
Thesaurus | Keyword |
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General | Submerged |
Instrument Keywords
Thesaurus | Keyword |
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Global Change Master Directory (GCMD) Instrument Keywords | LIDAR > Light Detection and Ranging |
Platform Keywords
Thesaurus | Keyword |
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Physical Location
• » Organization | Office for Coastal Management |
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• » City | Charleston |
• » State/Province | SC |
• Country | |
• » Location Description |
Data Set Information
* Data Set Scope Code | Data Set |
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• Data Set Type | |
• Maintenance Frequency | None Planned |
Maintenance Note | |
» Data Presentation Form | Map (digital) |
• Entity Attribute Overview |
The input parameters for the random consensus filter (RCF) were: grid cell size (buffer) = 1000 centimeters x 1000 centimeters; vertical tolerance (vertical width) = 200 centimeters. |
Entity Attribute Detail Citation |
http://pubs.usgs.gov/of/2009/1078/ |
Entity Attribute Detail URL | |
Distribution Liability |
Any conclusions drawn from the analysis of this information are not the responsibility of USGS, USDA NRCS, NOAA, the Office for Coastal Management or its partners. |
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. |
Support Roles
* » Support Role | Data Steward |
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* » Date Effective From | 2015-07-25 |
Date Effective To | |
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 |
Fax | |
Mobile | |
URL | https://coast.noaa.gov |
Business Hours | |
Contact Instructions |
* » Support Role | Distributor |
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* » Date Effective From | 2015-07-25 |
Date Effective To | |
Organization | Office for Coastal Management (OCM) |
Address |
2234 South Hobson Avenue Charleston, SC 29405-2413 |
Email Address | |
Phone | |
Fax | |
Mobile | |
URL | https://www.coast.noaa.gov/ |
Business Hours | |
Contact Instructions |
* » Support Role | Metadata Contact |
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* » Date Effective From | 2015-07-25 |
Date Effective To | |
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 |
Fax | |
Mobile | |
URL | https://coast.noaa.gov |
Business Hours | |
Contact Instructions |
* » Support Role | Point of Contact |
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* » Date Effective From | 2015-07-25 |
Date Effective To | |
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 |
Fax | |
Mobile | |
URL | https://coast.noaa.gov |
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Extents
Currentness Reference | Ground Condition |
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Extent Group 1
Extent Description |
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Extent Group 1 / Geographic Area 1
* » W° Bound | -65.27130878 |
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* » E° Bound | -64.41490881 |
* » N° Bound | 18.369432 |
* » S° Bound | 17.75629702 |
* » Description |
Extent Group 1 / Vertical Extent
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Extent Group 1 / Time Frame 1
* » Time Frame Type | Discrete |
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* » Start | 2014-03-07 |
End | |
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Description |
Extent Group 1 / Time Frame 2
* » Time Frame Type | Discrete |
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* » Start | 2014-03-08 |
End | |
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Description |
Extent Group 1 / Time Frame 3
* » Time Frame Type | Discrete |
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* » Start | 2014-03-11 |
End | |
Alternate Start As Of Info | |
Alternate End As Of Info | |
Description |
Extent Group 1 / Time Frame 4
* » Time Frame Type | Discrete |
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* » Start | 2014-03-12 |
End | |
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Description |
Extent Group 1 / Time Frame 5
* » Time Frame Type | Discrete |
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* » Start | 2014-03-13 |
End | |
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Description |
Extent Group 1 / Time Frame 6
* » Time Frame Type | Discrete |
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* » Start | 2014-03-14 |
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Description |
Extent Group 1 / Time Frame 7
* » Time Frame Type | Discrete |
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* » Start | 2014-03-17 |
End | |
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Description |
Extent Group 1 / Time Frame 8
* » Time Frame Type | Discrete |
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* » Start | 2014-03-18 |
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Alternate Start As Of Info | |
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Description |
Extent Group 1 / Time Frame 9
* » Time Frame Type | Discrete |
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* » Start | 2014-03-19 |
End | |
Alternate Start As Of Info | |
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Description |
Extent Group 1 / Time Frame 10
* » Time Frame Type | Discrete |
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* » Start | 2014-03-21 |
End | |
Alternate Start As Of Info | |
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Description |
Extent Group 1 / Time Frame 11
* » Time Frame Type | Discrete |
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* » Start | 2014-03-24 |
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Description |
Spatial Information
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Grid Representation Used? | |
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Vector Representation Used? | Yes |
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Access Information
Data License | |
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Data License URL | |
Data License Statement | |
* » Security Class | Unclassified |
* Security Classification System |
Unclassified |
Security Handling Description |
None |
• Data Access Policy | |
» Data Access Procedure |
This data can be obtained on-line at the following URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=4940 The data set is dynamically generated based on user-specified parameters.; |
• » Data Access Constraints |
None |
• Data Use Constraints |
The U.S. Geological Survey requests to be acknowledged as originator of these data in future products or derivative research. |
Metadata Access Constraints | |
Metadata Use Constraints |
Distribution Information
Start Date | 2019-07-01 |
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End Date | Present |
» Download URL | https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=4940 |
Distributor | Office for Coastal Management (OCM) (2015-07-25 - Present) |
File Name | Customized Download |
Description |
Create custom data files by choosing data area, product type, map projection, file format, datum, etc. |
File Date/Time | |
File Type (Deprecated) | Zip |
Distribution Format | |
File Size | |
Application Version | |
Compression | Zip |
Review Status |
Start Date | 2019-07-01 |
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End Date | Present |
» Download URL | https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/4940/index.html |
Distributor | Office for Coastal Management (OCM) (2015-07-25 - Present) |
File Name | Bulk Download |
Description |
Simple download of data files. |
File Date/Time | |
File Type (Deprecated) | LAZ |
Distribution Format | LAS/LAZ - LASer |
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Compression | Zip |
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Archive Information
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URLs
URL | https://coast.noaa.gov/dataviewer |
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Name | Data Access Viewer |
URL Type | Online Resource |
File Resource Format | |
Description |
Custom download tool |
URL | https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/4940/supplemental/usvi2014_eaarlb_m4940.kmz |
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Name | browse graphic |
URL Type | Browse Graphic |
File Resource Format | kmz |
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Activity Log
Activity Time | 2016-05-23 |
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Activity Type | |
Responsible Party | |
Description |
Date that the source FGDC record was last modified. |
Activity Time | 2017-11-14 |
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Activity Type | |
Responsible Party | |
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 Time | 2018-02-08 |
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Activity Type | |
Responsible Party | |
Description |
Partial upload of Positional Accuracy fields only. |
Activity Time | 2018-03-13 |
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Description |
Partial upload to move data access links to Distribution Info. |
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Issues
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Technical Environment
Description |
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Data Quality
Representativeness | |
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Accuracy |
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. |
Analytical Accuracy | |
Horizontal Positional Accuracy |
Raw elevation measurements have been determined to be within 1 meter in horizontal accuracy. |
Vertical Positional Accuracy |
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. |
Quantitation Limits | |
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Completeness Measure | |
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Analytical Precision | |
Field Precision | |
Sensitivity | |
Detection Limit | |
Completeness Report |
Missing 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 |
These data are located in UTM Zone 20. |
» Quality Control Procedures Employed |
Data Management
» Have Resources for Management of these Data Been Identified? | |
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» Do these Data Comply with the Data Access Directive? | |
» Is Access to the Data Limited Based on an Approved Waiver? | |
» If Distributor (Data Hosting Service) is Needed, Please Indicate | |
» Approximate Delay Between Data Collection and Dissemination | |
» If Delay is Longer than Latency of Automated Processing, Indicate Under What Authority Data Access is Delayed |
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» Actual or Planned Long-Term Data Archive Location | |
» If World Data Center or Other, Specify | |
» If To Be Determined, Unable to Archive, or No Archiving Intended, Explain |
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» Approximate Delay Between Data Collection and Archiving | |
» How Will the Data Be Protected from Accidental or Malicious Modification or Deletion Prior to Receipt by the Archive? |
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Lineage
» Lineage Statement |
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Sources
Citation Title | Lidar data |
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Contact Role Type | Originator |
Contact Type | Organization |
Contact Name | USGS |
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Process Steps
Process Step Number | 1 |
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» 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 (20140311-20141121). Data are converted from units of time to x,y,z points for elevation and formatted into .las and .xyz files, and the derived surface data are converted into raster data (GeoTIFFs). |
Process Date/Time | 2014-11-21 00:00:00 |
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Source |
Process Step Number | 2 |
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» Description |
The data were depth calibrated in ALPS (20150106) using a linear model with a slope of 0.98103 and an intercept of -0.000681. |
Process Date/Time | 2015-01-06 00:00:00 |
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Process Step Number | 3 |
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» Description |
Metadata imported into ArcCatalog 10.1.1.3143 from XML file. |
Process Date/Time | 2015-07-06 00:00:00 |
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Source |
Process Step Number | 4 |
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» Description |
Data were received by the NOAA Office for Coastal Management from Tim Battista and imported into the Digital Coast Data Access Viewer system. Data were reprojected from UTM 20N to geographic coordinates. Vertical values were transformed from orthometric to ellipsoid heights using the NGS GEOID12a model. Compression to an LAZ file was done with the LAStools 'laszip' program and can be unzipped with the same free program (laszip.org) |
Process Date/Time | 2015-07-07 00:00:00 |
Process Contact | Office for Coastal Management (OCM) |
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Email Address | |
Source | Lidar data |
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Acquisition Information
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Catalog Details
Catalog Item ID | 48140 |
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Metadata Record Created By | Anne Ball |
Metadata Record Created | 2017-11-14 14:19+0000 |
Metadata Record Last Modified By | SysAdmin InPortAdmin |
» Metadata Record Last Modified | 2023-10-17 16:12+0000 |
Metadata Record Published | 2022-03-16 |
Owner Org | OCM |
Metadata Publication Status | Published Externally |
Do Not Publish? | N |
Metadata Workflow State | Published / External |
Metadata Last Review Date | 2022-03-16 |
Metadata Review Frequency | 1 Year |
Metadata Next Review Date | 2023-03-16 |
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