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Global Attributes:	title: lidarBeachDEM name: VZ-1000 Calculated Beach Digital Elevation Model featureType: grid summary: Digital Elevation model collected using a Riegl VZ-1000 or VZ-2000 terrestrial laser scanner mounted on the North lidar tower at the United States Armp Corps of Engineers' Coastal And Hydraulics Laboratory's Field Research Facility (USACE/CHL/FRF) in Duck, NC. The Riegl VZ-1000 is the primary data collection instrument, with the VZ-2000 deployed while the VZ-1000 is being serviced. description: Lidar Beach Digital Elevation Model comment: Lidar point density and accuracy decreases with range. Please check coregQCFlag for a measure of rectification accuracy. cdm_data_type: Station history: Measured, rectified, coregistered, and processed at USACE/CHL/FRF. source: VZ-1000 or VZ-2000 terrestrial laser scanner observations from the North lidar tower at USACE/CHL/FRF. sourceUrl: (local files) standard_name_vocabulary: CFv25 Metadata_Conventions: Unidata Dataset Discovery v1.0, CF-1.6 Conventions: CF-1.6 creator_name: USACE/CHL/FRF creator_url: http://www.frf.usace.army.mil/ creator_email: frfwebmaster@usace.army.mil license: These data may be redistributed and used without restriction. Data are intended for scholarly use by the research community, with the express agreement that users will properly acknowledge the USACE Field Research Facility and the supporting investigator(s). Use or reproduction of these data for commercial purposes is prohibited without prior written permission. keywords_vocabulary: Global Change Master Directory (GCMD) Earth Science Keywords; CF Standard Name Table (v23, 23 March 2013) keywords: CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > NORTH CAROLINA, EARTH SCIENCE > OCEANS > COASTAL PROCESSES, EARTH SCIENCE > OCEANS > COASTAL PROCESSES > BEACHES, EARTH SCIENCE > OCEANS > COASTAL PROCESSES > INTERTIDAL ZONE, EARTH SCIENCE > OCEANS > COASTAL PROCESSES > SHORELINES, EARTH SCIENCE > OCEANS > OCEAN WAVES, Earth Remote Sensing Instruments > Active Remote Sensing > Altimeters > Lidar/Laser Altimeters DOD > DOD/USARMY/USACE/CHL/FRF > Field Research Facility, Coastal And Hydraulics Laboratory, U. S. Army Corps Of Engineers, U.S. Army, U. S. Department Of Defense, Lidar Data processing: realtime organization: USACE/CHL/FRF publisher_url: http://www.frf.usace.army.mil infoUrl: http://chlthredds.erdc.dren.mil/thredds/catalog/frf/catalog.html publisher_email: frfwebmaster@usace.army.mil publisher_name: USACE/CHL/FRF format_version: v1.0 institution: U. S. Army Corps Of Engineers, Coastal And Hydraulics Laboratory, Field Research Facility (USACE/CHL/FRF) contact: USACE/CHL/FRF contact_info: USACE/CHL/FRF contact_role: owner contributor_name: USACE/CHL/FRF contributor_role: USACE/CHL/FRF naming_authority: FRF origin: USACE/CHL/FRF acknowledgement: Data are provided by the US Army Engineer Research & Development Center, Coastal and Hydrualics Laboratory's Field Research Facility in Duck, NC. project: USACE Coastal Field Data Collection Program id: 948.0 processing_level: L1 geospatial_vertical_units: m geospatial_vertical_resolution: 0.01 geospatial_vertical_min: -5.0 geospatial_vertical_max: 10.0 geospatial_vertical_origin: NAVD88 (geoid12b) geospatial_lat_min: 36.17906247087372 geospatial_lat_max: 36.18251249185555 geospatial_lat_units: degrees_north geospatial_lon_min: -75.73714264268493 geospatial_lon_max: -75.746085545176 geospatial_lon_units: degrees_east geospatial_vertical_positive: up time_coverage_start: 2024-02-01T00:30:16 deployment_start: 2015-01-15T15:20:00Z platform: North lidar tower instrument: Riegl VZ-1000 or VZ-2000 terrestrial laser scanner vertical_datum: NAVD88 (geoid12b) horizontal_datum: FRF coordinates (rotated from NAD83(2011), North Carolina State Plane, meters(3200) using origin [901951.6805 E, 274093.1562 N] and rotation angle 69.9747) depth: 0.0 date_created: 2024-02-29 date_issued: 2024-02-29 time_coverage_end: 2024-02-29T23:41:13 Unlimited_Dimension: time

Variables:	station_name: String station_name units: long_name: station name cf_role: timeseries_id short_name: station_name DODS: strlen: 13 dimName: station_name_length
	time: Array of 64 bit Reals [time = 0..687] time: _FillValue: -999.99 units: seconds since 1970-01-01 00:00:00 standard_name: time long_name: UTC Sample Time calendar: gregorian description: 'Hourly time stamp for the bare-earth grid.' short_name: time _ChunkSizes: 512
	xFRF: Array of 64 bit Reals [xFRF = 0..129] xFRF: _FillValue: -999.99 units: m long_name: Local FRF Cross-Shore Coordinate Vector description: '1D Array of FRF X-coordinates (cross-shore) used in the mesh to form the grid. Alongshore values used in gridding are found in the correspondingly named array.' short_name: Cross Shore
	yFRF: Array of 64 bit Reals [yFRF = 0..499] yFRF: _FillValue: -999.99 units: m long_name: Local FRF Along-Shore Coordinate Vector description: '1D Array of FRF Y-coordinates (alongshore) used in the mesh to form the grid. Cross-shore values used in gridding are found in the correspondingly named array.' short_name: Along Shore
	latitude: Grid yFRF: xFRF: long_name: Latitude description: 'Array of latitudes in decimal degrees for gridded elevation points. Each point's location in latitude, longitude is found at the same indices in the corresponding variables. Each point's FRF X-coordinate, FRF Y-coordinate is found at the same indices in the mesh grids generated from xFRF, yFRF. The elevation for each point can be found at the same indices in Elevation.' short_name: lat _FillValue: -999.99 units: m
	longitude: Grid yFRF: xFRF: _FillValue: -999.99 units: m long_name: Longitude description: 'Array of longitudes in decimal degrees (positive or W) for gridded elevation points. Each longitude's corresponding latitude is found at the same indicies in Latitude. Each point's FRF X-coordinate, FRF Y-coordinate is found at the same indices in the mesh grids generated from xFRF, yFRF. The elevation for each point can be found at the same indices in Elevation.' short_name: lon
	elevation: Grid time: yFRF: xFRF: units: m long_name: Bare-Earth Sub-Aerial Beach Elevation description: 'Gridded array of bare-earth sub-aerial beach elevations. Data have been filtered to remove water, vegetation, and other non-ground points. Filtering was performed with an automated filter and DEMs have not been manually reviewed. Each point's location in latitude, longitude is found at the same indices in the corresponding variables. Each point's FRF X-coordinate, FRF Y-coordinate is found at the same indices in the mesh grids generated from xFRF, yFRF. Quality of data rectification can be evaluated using coregQCFlag' short_name: Elevation _FillValue: -999.99 _ChunkSizes: 1, 500, 130
	assessmentPlanesOffset: Array of 64 bit Reals [time = 0..687] time: _FillValue: -999.99 units: m long_name: Norm of Assessment Plane Offsets from Co-registration Accuracy Assessment Planes description: 'Norm of offsets in the x-, y-, and z-directions from the co-registration accuracy assessment planes in meters. The y-z assessment plane is a support beam on the FRF Pier, centered at approximately 182.33, 516.56, 6.17 (xFRF, yFRF, elevation) and is 0.037 m x 3.24 m x 0.89 m. The y-z assessment plane is located approximately 449 m from the lidar. The x-z assessment plane is the front face of the structure immediately to the south of the main FRF building, centered at approximately -33.70, 482.39, 7.96 (xFRF, yFRF, elevation) and is 2.81 m x 0.053 m x 2.40 m. The x-z assessment plane is located approximately 470 m from the lidar. The x-y assessment plane is a portion of the cul-de-sac in the neighborhood to the north of the device, centered at approximately -24.89, 1085.11, 3.25 (xFRF, yFRF, elevation) and is 2.36 m x 4.00 m x 0.043 m. The x-y assessment plane is located approximately 159 m from the lidar. Note that this offset is not indicative of the offset across the entire DEM. See rotationSigma and translationSigma for the residual standard error in rotation and translation, respectively, from the plane-matching algorithm. Co-registration QC Flag indicates the overall quality of the co-registration. Co-registration Algorithm Flag indicates which alogrithm was used for co-registration.' short_name: Norm Assessment Plane Offsets _ChunkSizes: 1
	rmsReflectorError: Array of 64 bit Reals [time = 0..687] time: _FillValue: -999.99 units: m long_name: Root Mean Square Error in Reflector Centroids description: 'Root mean square residual error of the centroids of 4-6 reflectors in scan. Actual reflector centroid locations were determined from a 3-minute survey using real-time kinematic (RTK) global positioning system (GPS) surveying equipment, with position converted to the local FRF coordinate system. Reflector centroids in scan were found using a reflectance threshold in 1 m cube around surveyed reflector location. See rotationSigma and translationSigma for the residual standard error in rotation and translation, respectively, from the plane-matching algorithm. See assessmentPlanesOffset for the norm of the x-, y-, and z-offsets from the co-registration assessment planes. Co-registration QC Flag indicates the overall quality of the co-registration. Co-registration Algorithm Flag indicates which alogrithm was used for co-registration.' short_name: RMS Reflector Error _ChunkSizes: 1
	translationSigma: Array of 64 bit Reals [time = 0..687][errorDimensions = 0..2] time: errorDimensions: units: long_name: Residual Standard Error in Translation description: 'Residual standard error in translation calculated from the least squares fit during plane-matching co-registration with dimensions listed in errorDimension. See rotationSigma for the residual standard error in rotation from plane-matching co-registration. See assessmentPlanesOffset for the norm of the x-, y-, and z-offsets from the co-registration assessment planes. See rmsReflectorError for RMS error of reflector centroids in scan. Co-registration QC Flag indicates the overall quality of the co-registration. Co-registration Algorithm Flag indicates which alogrithm was used for co-registration.' short_name: Translation Standard Error _FillValue: -999.99 _ChunkSizes: 1, 3
	rotationSigma: Array of 64 bit Reals [time = 0..687][errorDimensions = 0..2] time: errorDimensions: description: 'Residual standard error in rotation calculated from the least squares fit during plane-matching co-registration with dimensions listed in errorDimension. See translationSigma for the residual standard error in translation from plane-matching co-registration. See assessmentPlanesOffset for the norm of the x-, y-, and z-offsets from the co-registration assessment planes. See rmsReflectorError for RMS error of reflector centroids in scan. Co-registration QC Flag indicates the overall quality of the co-registration. Co-registration Algorithm Flag indicates which alogrithm was used for co-registration.' short_name: Rotation Standard Error units: long_name: Residual Standard Error in Rotation _FillValue: -999.99 _ChunkSizes: 1, 3
	coregQCFlag: Array of 64 bit Reals [time = 0..687] time: _FillValue: 9.0 units: long_name: Coregistration Algorithm QC Flag flag_values: 1, 2, 3, 4, 9 flag_meanings: 1=good_plane_matching, 2=not_coregistered, 3=questionable_or_non_plane_based, 4=bad, 9=missing description: 'Coregistration algorithm quality indicator. This flag should be used to evaluate quality of DEM rectification prior to data use. Flag 1 indicates co-registration using a plane-matching co-registration algorithm, norm of translationSigma < 0.004 m, norm of the assessment plane offsets < 0.1 m, and the RMS reflector error < 0.1 m. Flag 2 indicates that the original rectification matrix was used (the scan was not co-registered). Flag 3 indicates co-registration using a plane-matching algorithm with a combined translationSigma >= 0.004 m or a different co-registration algorithm used, with the norm of the assessment plane offsets < 0.1 m, and the RMS reflector error < 0.1 m. Flag 4 indicates that the norm of the assessment plane offsets >= 0.1 m or the RMS reflector error >= 0.1 m Flag 9 indicates that the scan was missing or that co-registration was not attempted General flag definitions guided by the Ocean Data Standards, UNESCO 2013 - IOC Manurals and Guides, 54, Volume 3 Version 1.' short_name: Coregistration QC Flag _ChunkSizes: 1
	coregAlgorithmFlag: Array of 64 bit Reals [time = 0..687] time: _FillValue: 9.0 units: long_name: Coregistration Algorithm Indicator Flag flag_values: 1, 2, 3, 4, 5, 6, 9 flag_meanings: 1=plane_matching, 2=rectififcation_only, 3=recent_coregistration_matrix, 4=four_reflector_centroids, 5=five_reflector_centroids, 6=six_reflector_centroids, 9=missing description: 'Coregistration algorithm type indicator. See coregQCFlag for indication of overall coregistration quality and rotationSigms/translationSigma for plane-matching coregistration quality. Flag 1 indicates co-registration using a plane-matching co-registration algorithm. Flag 2 indicates no co-registration, using only the appropriate rectification matrix. Flag 3 indicates co-registration using a recent scan's coregistration matrix, within 12 hours before scan or 6 hours since scan. Flag 4 indicates co-registration using reflector centroids of the closest four reflectors, exclude the furthest reflector. Flag 5 indicates co-registration using reflector centroids of five reflectors. Flag 6 indicates co-registration using reflector centroids of six reflectors. Flag 9 indicates no co-registration attempted.' short_name: Coregistration Algorithm Flag _ChunkSizes: 1

For questions or comments about this dataset, contact the administrator of this server [Spicer Bak] at: Spicer.Bak@usace.army.mil

For questions or comments about the OPeNDAP service bundled with the TDS, email THREDDS support at: support-thredds@unidata.ucar.edu

DDS:

Dataset {
    String station_name;
    Float64 time[time = 688];
    Float64 xFRF[xFRF = 130];
    Float64 yFRF[yFRF = 500];
    Grid {
     ARRAY:
        Float64 latitude[yFRF = 500][xFRF = 130];
     MAPS:
        Float64 yFRF[yFRF = 500];
        Float64 xFRF[xFRF = 130];
    } latitude;
    Grid {
     ARRAY:
        Float64 longitude[yFRF = 500][xFRF = 130];
     MAPS:
        Float64 yFRF[yFRF = 500];
        Float64 xFRF[xFRF = 130];
    } longitude;
    Grid {
     ARRAY:
        Float64 elevation[time = 688][yFRF = 500][xFRF = 130];
     MAPS:
        Float64 time[time = 688];
        Float64 yFRF[yFRF = 500];
        Float64 xFRF[xFRF = 130];
    } elevation;
    Float64 assessmentPlanesOffset[time = 688];
    Float64 rmsReflectorError[time = 688];
    Float64 translationSigma[time = 688][errorDimensions = 3];
    Float64 rotationSigma[time = 688][errorDimensions = 3];
    Float64 coregQCFlag[time = 688];
    Float64 coregAlgorithmFlag[time = 688];
} frf/geomorphology/DEMs/duneLidarDEM/2024/FRF-geomorphology_DEMs_duneLidarDEM_202402.nc;

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