Short Citation:
Office for Coastal Management, 2021: 2006 NOAA Bathymetric Lidar: Puerto Rico (Southwest), https://www.fisheries.noaa.gov/inport/item/48212.

Item Identification

Title: 2006 NOAA Bathymetric Lidar: Puerto Rico (Southwest)
Short Name: pr2006_puerto_rico_bathy_m2518_metadata
Status: Completed
Publication Date: 2013-08
Abstract:

This data set (Project Number OPR-I305-KRL-06) depicts depth values (mean 5 meter gridded) collected using LiDAR

(Light Detection & Ranging) from the shoreline of southwestern Puerto Rico to the shelf edge. The Tenix LADS Corporation

(TLI) acquired bathymetric LIDAR for NOAA from 4/07/2006 to 5/15/2006. Data was acquired with a LADS (Laser Airborne Depth Sounder)

Mk II Airborne System from altitudes between 1,200 and 2,200ft at ground speeds between 140 and 175 knots. The 900 Hertz Nd: YAG

(neodymium-doped yttrium aluminum garnet) laser (1064 nm) acquired 4x4 meter spot spacing and 200% seabed coverage.

This data set also contains LiDAR (Light Detection & Ranging) intensity values (mean 5 meter gridded) from the shoreline

of southwestern Puerto Rico to about 50 meters in depth. Reflectivity was calculated for each sounding as the ratio of

returned energy to transmitted energy, normalized for losses in a single wavelength (green/blue 532nm). The numerical

values for the relative reflectivity are scaled logarithmically to an 8-bit integer range 0 - 255

In total, 265 square nautical miles of LiDAR were collected between -50 m (topographic) and up to 70 m (depth), requiring a

total of 102 flight hours (134 hours, including flight time to and from San Juan airport). Environmental factors such

as wind strength and direction, cloud cover, and water clarity influenced the area of data acquisition on a daily basis.

The data was processed using the LADS Mk II Ground System and data visualization, quality control and final products were

created using CARIS HIPS and SIPS 6.1 and CARIS BASE Editor 2.1 The project was conducted to meet the IHO (International

Hydrographic Organization) Order 1 accuracy standards, dependent on the project area and depth. All users should individually

evaluate the suitability of this data according to their own needs and standards.

The data were received by the NOAA Office for Coastal Management from NCCOS. For data storage and Digital Coast provisioning

purposes the data were converted:

1. From MLLW depths to NAVD88 heights using Vdatum and then from NAVD88 heights to Ellipsoid heights using Geoid12a.

2. From UTM Zone 19, meters, NAD83 to geographic coordinates.

3. From no point classification to 11 (NOAA OCM bathymetry classification).

Under contract to the National Ocean Service, TLI collected airborne LiDAR bathymetry under Contract Number DG133C-03-CQ-0011,

Task Order T0008 and Project Number OPR-I305-KRL-06.

Original contact information:

Contact Org:

Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS),

Center for Coastal Monitoring and Assessment (CCMA), Biogeography Branch

Title: Project Manager - U.S. Caribbean

Phone: (301) 713-3028

Purpose:

The purpose of this survey was to provide NOAA with modern, accurate hydrographic survey data with which to update the nautical

charts of the assigned area and to provide NOAA with relative reflectivity data from the seabed for southwest Puerto Rico.

Notes:

10235

Supplemental Information:

A Report for the 2006 NOAA Puerto Rico Bathymetric Lidar data may be accessed at:

https://coast.noaa.gov/htdata/lidar1_z/geoid12a/data/2518/supplemental/LiDAR_2006_PuertoRico_DAPR.pdf

A footprint of this data may be viewed in Google Earth at:

https://coast.noaa.gov/htdata/lidar1_z/geoid12a/data/2518/supplemental/2006_NOAA_Puerto_Rico_Bathymetric_Lidar.kmz

Keywords

Theme Keywords

Thesaurus Keyword
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
None Backscatter
None Bathymetry
None Bathymetry/Topography
None Benthic
None Biogeography
None Coral
None GIS
None Habitat
None Integrated Ocean and Coastal Mapping
None Intensity
None IOCM
None LADS Mk II
None LiDAR
None Light
None Mosaic
None NOAA
None OPR-I305-KRL-06
None Raster
None Reef
None Reflectivity
None Seafloor

Temporal Keywords

Thesaurus Keyword
None 2006
None April
None May

Spatial Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Location Keywords Ocean > Atlantic Ocean > North Atlantic Ocean > Caribbean Sea > Puerto Rico
None Atlantic Ocean
None Caribbean Sea
None Mayaguez
None Puerto Rico
None Southwestern Puerto Rico
None U.S. Caribbean
None United States

Physical Location

Organization: Office for Coastal Management
City: Charleston
State/Province: SC

Data Set Information

Data Set Scope Code: Data Set
Maintenance Frequency: As Needed
Data Presentation Form: las
Distribution Liability:

These data were prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof,

nor any of their employees, make any warranty, expressed or implied, or assumes any legal liability or responsibility for the

accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed in this report, or represents

that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by

trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or

favoring by the United States Government or any agency thereof. Any views and opinions of authors expressed herein do not necessarily

state or reflect those of the United States Government or any agency thereof. Although all data have been used by NOAA, no warranty,

expressed or implied, is made by NOAA as to the accuracy of the data and/or related materials. The act of distribution shall not

constitute any such warranty, and no responsibility is assumed by NOAA in the use of these data or related materials. Any conclusions

drawn from the analysis of this information are not the responsibility of the NOAA Office for Coastal Management or its partners.

Data Set Credit: Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS)

Support Roles

Data Steward

CC ID: 624986
Date Effective From: 2013-08
Date Effective To:
Contact (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
URL: https://coast.noaa.gov

Distributor

CC ID: 624988
Date Effective From: 2013-08
Date Effective To:
Contact (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
URL: https://coast.noaa.gov

Metadata Contact

CC ID: 624989
Date Effective From: 2013-08
Date Effective To:
Contact (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
URL: https://coast.noaa.gov

Point of Contact

CC ID: 624987
Date Effective From: 2013-08
Date Effective To:
Contact (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
URL: https://coast.noaa.gov

Extents

Currentness Reference: Ground Condition

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 624992
W° Bound: -67.439646
E° Bound: -66.938861
N° Bound: 18.19272
S° Bound: 17.857963

Extent Group 1 / Time Frame 1

CC ID: 624991
Time Frame Type: Range
Start: 2006-04-07
End: 2006-05-15

Spatial Information

Spatial Representation

Representations Used

Vector: Yes

Access Information

Security Class: Unclassified
Data Access Procedure:

This data can be obtained on-line at the following URL:

https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=2518

This data set is dynamically generated based on user-specified parameters.

;

Data Access Constraints:

None, but please cite any use of this data.

Data Use Constraints:

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 being fully aware of its limitations.

NOTE: NOT TO BE USED FOR NAVIGATION

These data were prepared by an agency of the United States Government. Neither the United States Government nor any agency

thereof, nor any of their employees, make any warranty, expressed or implied, or assumes any legal liability or responsibility

for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed in this report, or

represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process,

or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement,

recommendation, or favoring by the United States Government or any agency thereof. Any views and opinions of authors expressed

herein do not necessarily state or reflect those of the United States Government or any agency thereof. Although all data have

been used by NOAA, no warranty, expressed or implied, is made by NOAA as to the accuracy of the data and/or related materials.

The act of distribution shall not constitute any such warranty, and no responsibility is assumed by NOAA in the use of these

data or related materials.

Distribution Information

Distribution 1

CC ID: 744001
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=2518
Distributor:
File Name: Customized Download
Description:

Create custom data files by choosing data area, product type, map projection, file format, datum, etc.

Distribution 2

CC ID: 744002
Download URL: https://coast.noaa.gov/htdata/lidar1_z/geoid12a/data/2518
Distributor:
File Name: Bulk Download
Description:

Simple download of data files.

URLs

URL 1

CC ID: 744004
URL: https://coast.noaa.gov/dataviewer
URL Type:
Online Resource

URL 2

CC ID: 744005
URL: https://coast.noaa.gov
URL Type:
Online Resource

URL 3

CC ID: 744006
URL: https://coast.noaa.gov/htdata/lidar1_z/geoid12a/data/2518/supplemental/2006_NOAA_Puerto_Rico_Bathymetric_Lidar.kmz
Name: Browse Graphic
URL Type:
Browse Graphic
File Resource Format: kmz
Description:

This graphic shows the lidar coverage for the 2006 NOAA Puerto Rico bathymetric lidar.

Activity Log

Activity Log 1

CC ID: 625030
Activity Date/Time: 2017-03-20
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 625029
Activity Date/Time: 2017-11-14
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 Log 3

CC ID: 717954
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 744003
Activity Date/Time: 2018-03-13
Description:

Partial upload to move data access links to Distribution Info.

Technical Environment

Description:

Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.2.1350

Data Quality

Horizontal Positional Accuracy:

Real-time positions were determined using an Ashtech GG24 GPS receiver aided by Wide Area Differential GPS (WADGPS)

service. In addition, a local GPS base station was established in each survey area and government operated continuously

logging GPS services were also utilized, including NGS CORS. These local logging stations enabled post-processed KGPS positions to be

determined relative to the local GPS base station and then applied to all soundings. This provided increased sounding

position accuracy and horizontal redundancy.

A number of position checks were conducted including DGPS site certifications of local reference stations for obstructions

and multipath, static position checks of all positioning systems on the tarmac, dynamic positioning checks between real

time WADGPS positions and post processed KGPS positions during sounding operations and navigation checks by overflying

visible objects of accurately known position.

IHO Order 1 position accuracy was achieved.

For additional information, refer to the Data Acquisition and Processing Report (DAPR):

https://coast.noaa.gov/htdata/lidar1_z/geoid12a/data/2518/supplemental/LiDAR_2006_PuertoRico_DAPR.pdf

Vertical Positional Accuracy:

Vertical control was established relative to the tide datum through observed tides from existing tide gauges

or tide gauges established for the survey. A number of checks were conducted of the tide gauges and datums including leveling

to benchmarks, 25 hour pole gauge comparisons and smoothing of the data. The reduction of soundings for tides throughout the

survey area was then conducted through tide models, including linear and planar interpolations and establishing tide zones

(polygons) where factors were applied to the to the height of tide and +/- offsets to the time within each individual zone.

Vertical control of soundings was checked by surveying the same area of seabed on each flight and conducting cross lines

throughout the survey areas. Mean depth differences and standard deviations between the data sets were determined.

These checks demonstrated that the data was consistent with IHO Order 1 depth accuracy.

For additional information, refer to the Data Acquisition and Processing Report (DAPR):

https://coast.noaa.gov/htdata/lidar1_z/geoid12a/data/2518/supplemental/LiDAR_2006_PuertoRico_DAPR.pdf

Completeness Report:

The survey area was sounded at 4x4m laser spot spacing with main lines of sounding spaced at 80m, which provided the required

200% coverage. It should be noted that at 4x4m laser spot spacing, there is a gap of 1 to 1.5m between the illuminated areas of

adjacent soundings at the sea surface. There is a possibility that small objects in shallow water along the coastline may fall

between consecutive 4x4m soundings and not be detected. There are also some gaps in the data due to turbidity and very shallow

water, as well as an intermittent laser problem on the last survey sortie. This has resulted in some along track and cross track anomalies and at the time this satisfied the requirement of the survey.

Conceptual Consistency:

While the project was conducted to meet IHO Order 1 accuracy standards, dependent on project area and depth, all users should

independently analyze the dataset according to their own needs and standards to determine data usability.

Lineage

Sources

OPR-I305-KRL-06 LiDAR Data

CC ID: 624970
Contact Name: Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA), National Ocean Service (NOS)
Extent Type: Range
Extent Start Date/Time: 2006-04-07
Extent End Date/Time: 2006-05-15
Source Contribution:

Original full resolution dataset. | Source Geospatial Form: vector digital data | Type of Source Media: external hard drive

Process Steps

Process Step 1

CC ID: 624971
Description:

Data Acquisition:

For this project (OPR-I305-KRL-06), the Chief of Party was TLI's Darren Stephenson and Hydrographer was TLI's Mark Sinclair.

Data was collected between 4/7/2006 & 5/15/2006 using the LADS Mk II Airborne System. The LADS Mk II Airborne System (AS)

consists of a Dash 8-200 series aircraft, which has a transit speed of 250 knots at altitudes of up to 25,000ft and an

endurance of up to eight hours. Survey operations are conducted from heights between 1,200 and 2,200ft at ground speeds

between 140 and 175 knots. The aircraft was fitted with an Nd: YAG laser, which operates at 900 Hertz from a stabilized

platform to provide a number of different spot spacings. The survey area was sounded at 4x4m laser spot spacing

with main lines of sounding spaced at 80m, which provided the required 200% coverage.

Green laser pulses are scanned beneath the aircraft in a rectilinear pattern. The pulses are reflected from the land,

sea surface, within the water column and from the seabed. The height of the aircraft is determined by the infrared laser

return, which is supplemented by the inertial height from the Attitude and Heading Reference System and GPS height.

Real-time positioning is obtained by an Ashtech GG24 GPS receiver combined with Wide Area DGPS (Differential Global

Positioning System) provided by the Fugro Omnistar to provide a differentially corrected position. Ashtech Z12 GPS

receivers are also provided as part of the Airborne System and Ground Systems to log KGPS (Kinetic Global

Positioning System) data on the aircraft and at a locally established GPS (Global Positioning System) base station.

For more details on the airborne system, refer to the DAPR (Data Acquisition and Processing Report) at:

https://coast.noaa.gov/htdata/lidar1_z/geoid12a/data/2518/supplemental/LiDAR_2006_PuertoRico_DAPR.pdf

Process Date/Time: 2006-01-01 00:00:00

Process Step 2

CC ID: 624972
Description:

Data Processing:

The data was processed using the LADS Mk II Ground System. It consists of a portable Compaq Alpha ES40 Series 3

processor server with 1 GB EEC RAM, 764 GB disk space, digital linear tape (DLT) drives and magazines, digital audio

tape (DAT) drive, CD ROM drive and is networked to up to 12 Compaq 1.5 GHz PCs and a HP 800ps Design Jet Plotter,

printers and QC workstations. The GS supports survey planning, data processing, quality control and data

export. The GS component also includes a KGPS base station, which provides independent post-processed position and height

data. The LADS ground system includes a reflectivity algorithm in which reflectivity is calculated for each sounding

as the ratio of returned energy to transmitted energy, normalized for losses. A comprehensive description of the GS

is provided in the Data Acquisition and Processing Report (DAPR) available at:

https://coast.noaa.gov/htdata/lidar1_z/geoid12a/data/2518/supplemental/LiDAR_2006_PuertoRico_DAPR.pdf

Corrections to Soundings:

The optics and electronics for laser transmission and reflected waveform collection for all soundings is done by

equipment mounted on a stabilized platform within the aircraft. This platform is stabilized by an Attitude and Heading

Reference System (AHRS) that minimizes the motion effect (roll and pitch) of the aircraft and all residuals from the local

horizontal are logged by the Airborne System for correctional processing by the Ground System. Sounding depths and

positions are determined in the Ground System from the raw waveform, aircraft height and platform attitude parameters

as logged by the Airborne System. The Ground System automatically corrects soundings for aircraft height and heading,

offsets between sensors, latency, mirror and platform angles, sea surface model errors, refraction of the laser beam at

the sea surface, the effects of scattering of the beam in the water column and reduction for tide. Correct operation

of the system is verified by static and dynamic position checks, benchmark lines and analysis of overlaps, redundancy

from the 200% coverage of the seabed and cross line comparison results.

Process Date/Time: 2006-01-01 00:00:00

Process Step 3

CC ID: 624973
Description:

Reflectance Data:

The reflectance XYZ data was imported into CARIS HIPS and SIPS as single beam data. The reflectance data was treated

much the same as ordinary XYZ data (XY horizontal position and Z as reflectance value). The procedure used is as follows:

- Modified XYZ file to add timestamp by using the CARIS XYZ File Manipulator utility

- Created an import script using the CARIS Generic Data Parser

- Imported modified XYZ file into CARIS HIPS and SIPS

- Computed Total Propagated Error (TPE) using zero values

- Applied tide corrections using a zero value file

- Merged TPE and tide correction with data

- Created field sheet to compute BASE surface of reflectance data

The XYZ had to be modified to add timestamp to each data point. The XYZ file was divided into smaller files containing

a maximum of 1,000,000 points per file. Each modified XYZ file was imported using the CARIS Generic Data Parser, creating

an import script to recognize each field attribute. Two scripts were created to import timestamps 1000000 to 9999999 and

the other 10000000 to 138000000. Once each XYZ file was imported into CARIS a generic zero tide value was applied to each

modified XYZ file followed by a zero TPE value computation. The TPE and tide calculations were then merged with the

reflectance data. A single field sheet was then created to incorporate six 'mean' BASE surfaces, gridded at a 5m resolution,

which covered the entire survey area. Using CARIS BASE Editor, these six BASE surfaces were combined into one surface to

produce a final 'mean' reflectance BASE surface. The necessity to divide the area into six initially was purely due to

processing limitations. Also, the grid resolution does not change relative to depth, as the laser pulse footprint stays

relatively constant regardless of depth and the laser spot spacing is consistent irrespective of aircraft altitude.

The 5m grid provides the largest amount of detail that can be supported by the LiDAR data density.

Process Date/Time: 2006-01-01 00:00:00

Process Step 4

CC ID: 624974
Description:

Quality Control & Product Creation:

CARIS HIPS and SIPS 6.1, Terramodel, Generic Mapping Tool, Visualization Tool Kit and Olex were used for data visualization,

quality control and final product creation. Validation proceeds through the following steps:

1. Examining the Depth Profile for the correct processing of each expected Survey Run.

2. Examining the Position Confidence (C3) profile to verify that adequate position accuracy is maintained during the

Survey Run. Note: Other profiles of supporting data such as EHE, number of satellites, and latency may also be examined

as run profiles.

3. Examining the Coverage Confidence (C6) profile to verify that no coverage gaps exist in the Survey Run.

Resolving anomalous soundings by examining data points in the Survey Run by checking:

a. The Primary Depth Display

b. The Waterfall Display

c. The Waveform Display

d. The Local Area Display

Editing operations include selection of the alternate depth, assignment of NBA or deletion of the sounding as appropriate.

Based on assessments made in the above steps the operator segments the line classifying each segment as:

a. Accepted

b. Anomalous (data not to be used) or

c. Rejected (for refly)

All operator interactions during the validation phase are logged so that complete traceability is maintained.

Data Visualization - All validated and checked data is exported from the GS in a defined ASCII format for spatial

presentation and checking. The position, depth, run and other relevant information are extracted from the line-based

data for use in the generation of Triangulated Irregular Networks (TINs) and gridded data sets. Both of these are used

to produce contour plots, sun-illuminated color banded images and coverage check plots. Anomalies found in these plots are

reported back to the checkers for remedial action in the GS.

Process Date/Time: 2006-01-01 00:00:00

Process Step 5

CC ID: 624975
Description:

Data Gaps -The survey area was sounded at 4x4m laser spot spacing with main lines of sounding spaced at 80m, which provided

the required 200% coverage. It should be noted that at 4x4m laser spot spacing, there is a gap of 1 to 1.5m between the

illuminated areas of adjacent soundings at the sea surface. There is a possibility that small objects in shallow water

along the coastline may fall between consecutive 4x4m soundings and not be detected. There are also some gaps in the data

due to turbidity and very shallow water, as well as an intermittent laser problem on the last survey sortie. This has resulted

in some along track and cross track anomalies and at the time this satisfied the requirement of the survey.

Position Checks - Two independent positioning systems were used during the survey. Real-time positions were aided by WADGPS

(Wide Area Differential Global Positioning System). A post-processed KGPS position was also determined relative to a local GPS

base station that was established on the rooftop of the Courtyard Marriott Hotel in San Juan. The post-processed KGPS position

solutions were applied to each sounding during post-processing and the height used in the datum filter.

Horizontal Control - Data collection and processing were conducted on the Airborne and Ground Systems in World Geodetic

System (WGS84) on Universal Transverse Mercator (Northern Hemisphere) projection UTM (N) in Zone 19, Central Meridian 69 W.

All units are in meters. This data was post-processed and all soundings are relative to the North American Datum 1983 (NAD83).

For more details, please see the Vertical and Horizontal Control Report.

Water Clarity - The water clarity in the survey area was ideal for laser bathymetry as the water was very clear. Coverage

was obtained for the majority of the survey area. The only area where coverage was not achieved was due to turbidity or very

shallow water. Water depths to 50m were achieved at the extent of the predominant reef structure in SW Puerto Rico. The majority

of the survey area is less than 20m deep. There are a number of areas throughout the survey area where no depths were achieved

due to turbidity or very shallow water. The water clarity in some areas did vary on a daily basis, which required careful

management. Additional survey lines were planned and flown to minimize the data gaps due to turbidity.

Process Date/Time: 2006-01-01 00:00:00

Process Step 6

CC ID: 624976
Description:

The final images were re-projected from Transverse Mercator to NAD 1983 UTM Zone 19N using ArcGIS. Holidays (i.e., missing data

values) were filled using a nearest neighbor interpolation technique.

Process Date/Time: 2007-12-01 00:00:00

Process Step 7

CC ID: 624977
Description:

The NOAA Office for Coastal Management received the bathymetric lidar and reflectance data in two 5X5 m grids, in geotiff format.

The data were in UTM Zone 19N, meters, NAD83 coordinates and were vertically referenced to MLLW. The vertical units

of the data were meters. OCM performed the following processing for data storage and Digital Coast provisioning purposes:

1. The data (both bathymetry and reflectance) were converted from geotiff format to xyz text format.

2. The bathymetric data file was split up into 12 smaller files, using the linux command, split.

3. The 12 bathymetric files (xyz) and the reflectance file (xyr) were combined into 12 xyzr files using the NOAA OCM script, brundle.

4. The 12 xyzr files were processed through VDatum to convert from UTM coordinates to geographic coordinates and to convert

from MLLW depths to NAVD88 heights.

5. The 12 xyzr files were converted to las format and the point classifications set to 11 (NOAA OCM bathymetry) using the lastools

tool, txt2las

6. The data were converted from NAVD88 heights to ellipsoid heights using Geoid 12a and the geotiff keys were assigned.

7. Data were zipped to laz format

Process Date/Time: 2013-07-01 00:00:00

Catalog Details

Catalog Item ID: 48212
Metadata Record Created By: Anne Ball
Metadata Record Created: 2017-11-14 14:20+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2019-07-02 15:17+0000
Metadata Record Published: 2018-03-13
Owner Org: OCM
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Next Review Date: 2019-03-14