50099 usgs2003_usvi_topobathy_m566_metadata Data Set Published / External 49401 Lidar - partner (no harvest) Project Completed 2011 This data set contains topographic and bathymetric lidar data that were collected on April 21, 23, 30, May 2, and June 14, 17 of 2003, cooperatively by the U.S. Geological Survey (USGS), National Aeronautics and Space Administration (NASA), and National Park Service (NPS). The data is for part of the U.S. Virgin Islands (island of St. John and a portion of the northern coastline of St. Croix). The bathymetric lidar data are classified as 11 and the topographic lidar data are classified as 0. A first surface and submerged topography elevation map (also known as a Digital Elevation Model, or DEM) of a portion of the U.S. Virgin Islands (island of St. John and a portion of the northern coastline of St. Croix) was produced from remotely sensed, geographically referenced elevation measurements cooperatively by the U.S. Geological Survey (USGS), National Aeronautics and Space Administration (NASA), and National Park Service (NPS). 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 surveyed easily 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: Amar Nayegandhi Contact Org: Jacobs Technology, U.S. Geological Survey, FISC, St. Petersburg, FL Title: Computer Scientist Phone: 727-803-8747 (x3026) Email: anayegandhi@usgs.gov The purpose of this project was to produce a highly detailed and accurate first surface and submerged topography elevation map of a portion of the U.S. Virgin Islands. 10743 Raw Lidar data are not in a format that is generally usable by Park Service 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 converts raw Lidar data into a GIS-compatible map product to be provided to National Park Service 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 development of custom software for creating these data products has been supported by the USGS CMG Program's Decision Support for Coastal Parks, Sanctuaries, and Preserves Project. Processed data products are used by the USGS 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. A footprint of this data set may be viewed in Google Earth at: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/566/supplemental/2003_USGS_USVI_TopoBathy_Lidar.kmz Theme ISO 19115 Topic Category elevation Theme ALPS Theme EAARL Temporal 2003 Office for Coastal Management Charleston SC Data Set None Planned Each pixel of the encoded GeoTIFF has an explicit elevation value associated with it. The GeoTIFF grid is encoded with a 1-meter resolution. The variables measured by EAARL are distance between aircraft and GPS satellites (m), attitude information (roll, pitch, heading in degrees), scan angle (degrees), second of the epoch (sec), and 1-ns time-resolved return intensity waveform (digital counts). Z value is referenced to orthometric elevations derived from National Geodetic Survey Geoid Model, GEOID03. Any conclusions drawn from the analysis of this information are not the responsibility of the USGS, the Office for Coastal Management or its partners. 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. Acknowledgment of the U.S. Geological Survey, Florida Integrated 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 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. Data Steward 2011 Organization NOAA Office for Coastal Management NOAA/OCM coastal.info@noaa.gov 2234 South Hobson Ave Charleston SC 29405-2413 (843) 740-1202 https://coast.noaa.gov NOAA Office for Coastal Management Home Page Online Resource Distributor 2011 Organization NOAA Office for Coastal Management NOAA/OCM coastal.info@noaa.gov 2234 South Hobson Ave Charleston SC 29405-2413 (843) 740-1202 https://coast.noaa.gov NOAA Office for Coastal Management Home Page Online Resource Metadata Contact 2011 Organization NOAA Office for Coastal Management NOAA/OCM coastal.info@noaa.gov 2234 South Hobson Ave Charleston SC 29405-2413 (843) 740-1202 https://coast.noaa.gov NOAA Office for Coastal Management Home Page Online Resource Point of Contact 2011 Organization NOAA Office for Coastal Management NOAA/OCM coastal.info@noaa.gov 2234 South Hobson Ave Charleston SC 29405-2413 (843) 740-1202 https://coast.noaa.gov NOAA Office for Coastal Management Home Page Online Resource Ground Condition -64.819269 -64.607852 18.373668 17.746823 Discrete 2003-04-21 Discrete 2003-04-23 Discrete 2003-04-30 Discrete 2003-05-02 Discrete 2003-06-14 Discrete 2003-06-17 Yes Unclassified Unclassified None This data can be obtained on-line at the following URL: https://coast.noaa.gov/dataviewer; None 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. https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=566 Customized Download Create custom data files by choosing data area, product type, map projection, file format, datum, etc. https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/566/index.html Bulk Download Simple download of data files. https://coast.noaa.gov Online Resource https://coast.noaa.gov/dataviewer Online Resource 2017-01-05 Date that the source FGDC record was last modified. 2017-11-14 Converted from FGDC Content Standard for Digital Geospatial Metadata (version FGDC-STD-001-1998) using 'fgdc_to_inport_xml.pl' script. Contact Tyler Christensen (NOS) for details. 2018-02-08 Partial upload of Positional Accuracy fields only. 2018-03-13 Partial upload to move data access links to Distribution Info. Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.2.1350 The expected accuracy of the measured variables is as follows: attitude within 0.07 degree, 3 cm nominal ranging accuracy, and vertical elevation accuracy of +/-15 cm for the topographic surface. Quality checks are built into the data-processing software. Raw elevation measurements have been determined to be within 1-meter horizontal accuracy. Elevations of the DEM are vertically consistent with the point elevation data, +/-15 cm. Not Provided When the data was received by the NOAA Office for Coastal Management, each file contained data located in a 2-km by 2-km tile, where the upper-left bound can be quickly assessed through the file name. The first 3 numbers in the file name represented the left-most UTM easting coordinate (e###000) in meters, the next 4 numbers represented the top-most UTM northing coordinate (n####000) in meters, and the last 2 numbers (##) represented the UTM zone in which the tile is located (for example, fs_e123_n4567_20). EAARL Coastal Topography--St. John, U.S. Virgin Islands 2003: First Surface 2008-01-01 Discrete 2003-04-21 None | Source Geospatial Form: remote-sensing image | Type of Source Media: Point elevation measurements collected by the EAARL sensor. EAARL Submerged Topography--U.S. Virgin Islands 2003 2008-01-01 Discrete 2003-04-21 None | Source Geospatial Form: remote-sensing image | Type of Source Media: Point elevation measurements collected by the EAARL sensor. 1 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-nm) 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, FL, 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 (GeoTIFFs). 2008-01-01T00:00:00 2 Metadata imported into ArcCatalog from XML file. 2008-07-29T00:00:00 3 The NOAA Office for Coastal Management (OCM) received the data in las format. The files contained LiDAR intensity and elevation measurements. OCM performed the following processing for data storage purposes and Digital Coast provisioning: 1. The data were converted from UTM (Zone 20) WGS84 coordinates to geographic NAD83 coordinates. 2. The bathy data were reclassified from 0 to 11 and the topo data were left at classification 0. 3. The data were converted from ITRF00 ellipsoid heights to GRS80 ellipsoid heights using Geoid03. 4. The data were sorted by latitude and the LAS header files were updated. 2011-02-01T00:00:00 gov.noaa.nmfs.inport:50099 Anne Ball 2017-11-15T15:24:16 SysAdmin InPortAdmin 2022-08-09T17:11:37 2022-03-16 OCM Partners OCMP 1002 Public No No 2022-03-16 1 Year 2023-03-16