Data Management Plan (Deprecated)

This data set contains lidar point data from a strip of Southern California coastline

(including water, beach, cliffs, and top of cliffs) from Dana Point to Point 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 is installed in

a single engine Cessna 206 (tail number N4589U) owned and operated by the Texas State Aircraft Pooling Board.

The lidar data set described by this document was collected at low tide on 22 May 2002 (14202) between 18:20 and 21:39 UTC

(actual data collection). Conditions on that day were light clouds along the shoreline as well as offshore. 99d118 instrument

settings for this flight were; laser pulse rate: 25kHz, scanner rate: 26Hz (28Hz for calibration target), scan angle:

+/-20deg, beam divergence: narrow, altitude: 680-780m AGL for first half of flight and 900-950 for second half of flight,

and ground speed: 83-125kts. Two GPS base stations (Scripps pier and San Onofre Power Plant) were operating during the survey.

The survey included 3 shoreline passes between Dana Point and Point La Jolla as well as one offshore pass along the 20m

isobath. 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.

Original contact information:

Contact Name: Julie Thomas/Randy Bucciarelli

Contact Org: SCBPS/CDIP, Scripps Institution of Oceanography

Title: Project Managers

Phone: 858-534-3032

Process Steps:

• 2002-05-22 00:00:00 - 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). 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). 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. 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. Then generate entire lidar point file (9-column ASCII file). 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). Transfer point file from NT workstation to UNIX workstation. Parse the 9-column lidar point file into 3.75-minute quarter-quadrangle components and apply elevation bias correction (determined during calibration step). 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. 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). Latitude and longitude are in decimal degrees with nine significant digits to retain the 0.01m resolution of the UTM coordinates. 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). West longitude is negative and north latitude is positive. The eighteen UTM quarter-quad files were re-organized into ten 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. may02) and the lower latitude bounding the quarter-quad. The quarter-quad file name and the corresponding lat-long file name are shown below. Processing occurred from 20020522-20030416. d_point_nw.asc,d_point_ne.asc = may02_33.4375.asc d_point_se.asc, s_clem_sw.asc = may02_33.3750.asc s_ono_nw.asc, s_ono_ne.asc, l_pul_nw.asc = may02_33.3125.asc l_pul_sw.asc, l_pul_se.asc = may02_33.2500.asc oside_ne.asc = may02_33.1875.asc oside_se.asc, s_luis_sw.asc = may02_33.1250.asc encin_nw.asc, encin_ne.asc = may02_33.0625.asc encin_se.asc = may02_33.0000.asc d_mar_oew_ne.asc = may02_32.9375.asc d_mar_oew_se.asc = may02_32.8750.asc l_jol_oew_ne.asc = may02_32.8125.asc
• 2003-04-18 00:00:00 - Created initial metadata
• 2007-07-24 00:00:00 - The NOAA Office for Coastal Management (OCM) received files in ASCII format. The files contained LiDAR intensity and elevation measurements. OCM 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.

This data can be obtained on-line at the following URL: https://coast.noaa.gov/dataviewer

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