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Metadata Identifier: gov.noaa.csc.maps:2004_CA_Apr_m50

Aggregation Info | Bands | Citations | Constraints | Coverage Descriptions | Dimensions | Extents | Formats | Geographic Bounding Box
Georectified Information | Georeferenceable Information | Identifiers | Instruments | Mediums | OnlineResources | Operations
Platforms | Process Steps | Range Elements | Reference Systems | Responsible Parties | Series | Sources | Spatial Grids | Temporal Extents

MD_DataIdentification

Count Component Title Abstract
1 April 2004 Lidar Point Data of Southern California Coastline: Dana Point to Point La Jolla This data set contains lidar point data (Geodetic Coordinates) from a strip of Southern California coastline (including water, beach, cliffs, and top of cliffs) from Dana Point to La Jolla. The data set was created by combining data collected using an Optech Inc. Airborne Laser Terrain Mapper (ALTM) 1225 in combination with geodetic quality Global Positioning System (GPS) airborne and ground-based receivers. The Bureau of Economic Geology, the University of Texas at Austin owns and operates an ALTM 1225 system (serial number 99d118). The system was installed in a twin engine Partenavia P-68 (tail number N3832K) owned and operated by Aspen Helicopter, Inc. The lidar data set described by this document was collected on 2 April 2004 between 19:14 and 21:20 UTC. Julian Day 09304 (see Lineage, Source_Information, Source_Contribution for pass information). Conditions on 4 April were low clouds at 2500-3000 ft and lower over La Jolla. 99d118 instrument settings for these flights were; laser pulse rate: 25kHz, scanner rate: 26Hz, scan angle: +/- 20deg, beam divergence: narrow, altitude: 300-600m AGL, and ground speed: 95-120kts. Two GPS base stations were operating during each day of the survey, Point Loma and San Onofre on 08306 and Seal Beach and San Onofre on 08406 (see Lineage, Source_Information, Source_Contribution for coordinates). Data represented is all points including terrain, vegetation, and structures. This data also contains returns from the water surface. No processing has been done to remove returns from terrain, vegetation, structures or water surfaces.
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SV_Identification

none found
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CI_Citation

Count Component Title Date Citation Identifier
1 Air and Ground GPS files from 09304
  • 2004-04-02
1 April 2004 Lidar Point Data of Southern California Coastline: Dana Point to Point La Jolla
  • 2004-06-22
1 North American Datum 1983
  • 2007-01-19
1 Raw lidar data output from ALTM 1225
  • 2004-04-02
3 none
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    CI_Series

    none found
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    CI_ResponsibleParty

    Count Component Individual Organization Position Email Role Linkage
    1 resourceProvider http://www.epsg-registry.org/export.htm?gml=urn:ogc:def:crs:EPSG::4269
    3 Bureau of Economic Geology, University of Texas at Austin originator
    1 Bureau of Economic Geology, University of Texas at Austin Coastal Studies Group Member processor
    1 Center for Space Research, University of Texas at Austin originator
    1 NOAA CSC (originator) DOC/NOAA/NOS/CSC > Coastal Services Center, National Ocean Service, National Oceanic and Atmospheric Administration, U.S. Department of Commerce csc.info@noaa.gov originator
    1 NOAA CSC (publisher) DOC/NOAA/NOS/CSC > Coastal Services Center, National Ocean Service, National Oceanic and Atmospheric Administration, U.S. Department of Commerce csc.info@noaa.gov publisher
    1 NOAA CSC(distributor) DOC/NOAA/NOS/CSC > Coastal Services Center, National Ocean Service, National Oceanic and Atmospheric Administration, U.S. Department of Commerce csc.info@noaa.gov distributor
    1 NOAA CSC (processor) DOC/NOAA/NOS/CSC > Coastal Services Center, National Ocean Service, National Oceanic and Atmospheric Administration, U.S. Department of Commerce csc.info@noaa.gov processor
    1 EPSG Registry European Petroleum Survey Group publisher http://www.epsg-registry.org/
    1 Julie Thomas/Randy Bucciarelli SCBPS/CDIP, Scripps Institution of Oceanography Project Managers pointOfContact
    1 Mike Sutherland(author) Mike Sutherland DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce mike.sutherland@noaa.gov author
    1 Mike Sutherland Mike Sutherland DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce mike.sutherland@noaa.gov distributor
    1 Pamela Grothe DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce processor
    1 Scripps Institute of Oceanography originator
    1 Southern California Beach Processes Study (SCBPS)/Coastal Data Information Program (CDIP) part of Scripps Institution of Oceanography (SIO) in cooperation with Bureau of Economic Geology, University of Texas at Austin. originator
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    CI_OnlineResource

    Count Component Linkage Name Description Function
    1 http://www.epsg-registry.org/ European Petroleum Survey Group Geodetic Parameter Registry Registry that accesses the EPSG Geodetic Parameter Dataset, which is a structured dataset of Coordinate Reference Systems and Coordinate Transformations. search
    1 http://www.epsg-registry.org/export.htm?gml=urn:ogc:def:crs:EPSG::4269 NAD83 Link to Geographic Markup Language (GML) description of reference system. information
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    MD_Identifier or RS_Identifier

    Count Component Code
    1 Ellipsoid in Meters
    1 urn:ogc:def:crs:EPSG::4269
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    EX_Extent

    Bounding Box Temporal Extent
    Count Component Description West East North South Start End
    1 -117.712884 -117.249884 33.466024 32.838924
    2
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    EX_GeographicBoundingBox

    Count Component West East North South
    1 -117.712884 -117.249884 33.466024 32.838924
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    EX_TemporalExtent

    Count Component Start End
    3
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    MD_Format

    Count Component Name Version specification
    1 LAZ
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    MD_Medium

    none found
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    MD_Constraints

    Count Component Use Limitation
    1 Lidar Use Limitation These data depict the elevations at the time of the survey and are only accurate for that time. 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. Any conclusions drawn from analysis of this information are not the responsibility of NOAA or any of its partners. These data are NOT to be used for navigational purposes.
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    MD_ReferenceSystem

    Count Component Code Authority Title
    1 Ellipsoid Ellipsoid in Meters
    1 NAD83 urn:ogc:def:crs:EPSG::4269 North American Datum 1983
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    MD_GridSpatialRepresentation

    none found
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    MD_Georeferenceable or MI_Georeferenceable

    none found
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    MD_Georectified or MI_Georectified

    none found
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    MD_Dimension

    none found
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    MD_CoverageDescription or MI_CoverageDescription

    none found
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    MD_Band or MI_Band

    none found
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    MI_RangeElementDescription

    none found
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    MD_AggregateInformation

    none found
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    LE_Source or LI_Source

    Count Component Title Date Description
    1 Air and Ground GPS files from 09304 2004-04-02 Source Contribution: GPS data. Air and ground GPS files base station coordinates (Easting, Northing, HAE) in NAD83: Dana Point (DANA) = 434088.848, 3702981.811, 52.916 Point Loma (LOMA) = 477399.6818, 3614791.197, 90.892 Source Type: digital file
    1 Raw lidar data output from ALTM 1225 2004-04-02 Source Contribution: Raw lidar data files. raw lidar data from ALTM 1225 09304 Pass 1 (Carlsbad to Scripps Pier) = 19:18-19:26 UTC Pass 2 (Point La Jolla to Dana Point) = 19:29-19:54 UTC Pass 3 (Dana Point to Point La Jolla) = 19:59-20:25 UTC Pass 4 (Point La Jolla to Del Mar) = 20:27-20:30 UTC (wide divergence) 2 calibration passes between 20:32-20:35 UTC Pass 5 (Del Mar to Dana Point) = 20:37-21:02 UTC Pass 6 (Dana Point to Carlsbad) = 21:03-21:20 UTC Source Type: digital file
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    LE_ProcessStep or LI_ProcessStep

    Count Component DateTime Description
    1 2004-06-22T00:00:00 1. Transfer raw ALTM 1225 flight data, airborne GPS data collected at 1 Hz using Ashtech receiver, and ground-based GPS data collected at 1 Hz using Ashtech and Trimble 4000SSI receivers to NT workstation. Generate decimated lidar point file from above three data sets using Optech's Realm 2.27 software. This is a 9-column ASCII data set with the following format: time tag; first pulse Easting, Northing, HAE; last pulse Easting, Northing, HAE; first pulse intensity; and last pulse intensity. View decimated lidar point file to check data coverage (i.e. sufficient overlap of flight lines and point spacing). 2. Compute base station coordinates using National Geodetic Survey's PAGES software. Computed aircraft trajectories for both base stations using National Geodetic Survey's KINPOS software. Coordinates for base stations and trajectories are in the International Terrestrial Reference Frame of 2000 (ITRF2000) datum. Trajectories from both base stations were merged into one. Weighting for trajectory merge is based upon baseline length (distance from base station) and solution RMS. Transformed trajectory solution from ITRF2000 to North American Datum of 1983 (NAD83). 3. Use NAD83 trajectories and aircraft inertial measurement unit data in Applanix's POSProc version 2.1.4 to compute an optimal 50Hz inertial navigation solution. 4. Substitute the aircraft position and attitude information from the inertial navigation solution into Realm 2.27. Extract calibration area data set from lidar point file for quality control and instrument calibration checks. If necessary, use multiple iterations to adjust calibration parameters (pitch, roll, and scale) and reprocess sample data set. Determine and apply bias corrections based upon ground GPS. Then generate entire lidar point file (9-column ASCII file). 5. Use the Geiod99 geoid model to convert from Height Above the GRS80 ellipsoid to elevations with respect to the North American Vertical Datum 88 (NAVD88). 6. Parse the 9-column lidar point file into 3.75-minute quarter-quadrangle components. There are some points in the file that only contain 5-columns. These are points that either the first or last pulse was not recorded. 7. UTM Easting and Northing were converted to geodetic latitude and longitude with respect to the GRS80 ellipsoid. The conversion was computed using the TMGEOD and TCONPC fortran subroutines written by T. Vincenty (NGS). Each record contains 9 columns of data: time tag (seconds in the GPS week), first return Latitude, first return Longitude, first return NAVD88, last return Latitude, last return Longitude, last return NAVD88, first return intensity, and last return intensity. In some cases either the first or last return values may be missing (5 columns). Latitude and longitude are in decimal degrees with nine significant digits to retain the 0.01m resolution of the UTM coordinates. West longitude is negative and north latitude is positive. 8. The eighteen UTM quarter-quad files were re-organized into eleven files. UTM quarter-quads files that were delineated by the same upper and lower latitude bounds were concatenated. The lat-long files were named by the month-year of the survey (e.g. mar03) and the lower latitude bounding the quarter-quad.
    1 2007-07-24T00:00:00 The NOAA Coastal Services Center (CSC) received files in ASCII format. The files contained LiDAR intensity and elevation measurements. CSC performed the following processing on the data to make it available within the LiDAR Data Retrieval Tool (LDART) 1. Data returned to ellipsoid heights from NAVD88, using GEOID99. 2. Data converted to LAS format. 3. The LAS data were sorted by latitude and the headers were updated.
    1 2007-12-26T00:00:00 The NOAA National Geophysical Data Center (NGDC) received lidar data files via ftp transfer from the NOAA Coastal Services Center. The data are currently being served via NOAA CSC Digital Coast at http://www.csc.noaa.gov/digitalcoast/. The data can be used to re-populate the system. The data are archived in LAS or LAZ format. The LAS format is an industry standard for LiDAR data developed by the American Society of Photogrammetry and Remote Sensing (ASPRS); LAZ is a loseless compressed version of LAS developed by Martin Isenburg (http://www.laszip.org/). The data are exclusively in geographic coordinates (either NAD83 or ITRF94). The data are referenced vertically to the ellipsoid (either GRS80 or ITRF94), allowing for the ability to apply the most up to date geoid model when transforming to orthometric heights.
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    MI_Operation

    none found
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    MI_Platform

    none found
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    MI_Instrument

    none found
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