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Short Citation:
OCM Partners, 2022: 2007 Joint Airborne Lidar Bathymetry Technical Center of Expertise (JALBTCX) Topobathy Lidar: Guam, https://www.fisheries.noaa.gov/inport/item/50065.

Item Identification

Title: 2007 Joint Airborne Lidar Bathymetry Technical Center of Expertise (JALBTCX) Topobathy Lidar: Guam
Short Name: usace2007_guam_m551_metadata
Status: Completed
Publication Date: 2007-12-11
Abstract:

These data were collected for the Government of Guam Department of Public Works and the Government of Guam Office of Homeland

Security from February 18 through May 20, 2007. The data contained in these files contain topographic data collected by the CHARTS

system. The data points representing bare earth have been classified as such using TerraScan. The topographic lidar was collected

across the island of Guam to produce 2 foot contours and bathymetric lidar was collected to fill the areas where no data were

obtained during previous survey efforts. The bathymetric lidar data were collected from the land/water interface seaward to a

depth of 40 meters or laser extinction, whichever came first. This is a classified data set. Classification values are:

Class 1: Unclassified

Class 2: Ground

Class 11: Bathymetric points

Class 14: upland collected bathymetric points (green topo)

The data contain both first and last return lidar data. The topographic lidar data are vertically referenced to Mean Sea Level (MSL)

and the bathymetric lidar data are referenced to Mean Lower Low Water (MLLW).

Purpose:

The purpose of this survey was to collect topographic lidar across the island of Guam to produce 2-foot contours and to collect

bathymetric lidar data to fill the areas where no data were obtained during previous survey efforts. The bathymetric lidar data

were to be collected from the land water interface seaward to a depth of 40 meters or laser extinction, whichever comes first.

Notes:

10709

Supplemental Information:

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

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/msl/551/supplemental/2007_JALBTCX_Topobathy_Guam_Lidar.kmz

Keywords

Theme Keywords

Thesaurus Keyword
ISO 19115 Topic Category
elevation

Temporal Keywords

Thesaurus Keyword
UNCONTROLLED
None February 2007

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
Distribution Liability:

Any conclusions drawn from the analysis of this information are not the responsibility of JALBTCX, the Office for Coastal Management,

or its partners.

Data Set Credit: Acknowledgement of the Joint Airborne Lidar Bathymetry Technical Center of Expertise (JALBTCX) would be appreciated in any publications or derived products.

Support Roles

Data Steward

CC ID: 688963
Date Effective From: 2007-12-11
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: 688965
Date Effective From: 2007-12-11
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: 688966
Date Effective From: 2007-12-11
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: 688964
Date Effective From: 2007-12-11
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: 1138903
W° Bound: 144.616616
E° Bound: 144.962572
N° Bound: 13.654497
S° Bound: 13.229483

Extent Group 1 / Time Frame 1

CC ID: 1138902
Time Frame Type: Range
Start: 2007-02-18
End: 2007-05-20

Access Information

Security Class: Unclassified
Data Access Procedure:

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

Data Access Constraints:

None

Data Use Constraints:

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.

Distribution Information

Distribution 1

CC ID: 742865
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=551
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: 742866
Download URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/msl/551/index.html
Distributor:
File Name: Bulk Download
Description:

Simple download of data files.

Activity Log

Activity Log 1

CC ID: 688978
Activity Date/Time: 2016-05-23
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 688977
Activity Date/Time: 2017-11-14
Description:

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.

Activity Log 3

CC ID: 718669
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 742867
Activity Date/Time: 2018-03-13
Description:

Partial upload to move data access links to Distribution Info.

Data Quality

Accuracy:

These data are not attributed. | Quantitative Value: N/A | Quantitative Test Explanation: These data are not attributed.

Horizontal Positional Accuracy:

The data positions were obtained using post processed KGPS methods. The horizontal accuracy of the data is better than +/- 0.75 m.; Quantitative Value: 0.75 meters, Test that produced the value: 1 Sigma

Vertical Positional Accuracy:

The data positions were obtained using post processed KGPS methods. The vertical accuracy of the data is better than +/- 0.20 m.; Quantitative Value: 0.20 meters, Test that produced the value: 1 Sigma

Completeness Report:

These data covered the required survey area with minimal gaps in data coverage except near tops of mountains. These gaps are caused

when the ground elevation rises so high that the lidar swath (based on maximum scan angles and altitude) from adjacent flight lines

no longer overlap. The data postings are very consistent with postings nominally at 1.3 m density.

Conceptual Consistency:

The data provided in this file were tested against ground truth data. At these locations the lidar data matched within 0.20 meters,

and different flight line data agreed within 0.20 meters.

Lineage

Sources

2007 HI Guam CHARTS Survey

CC ID: 1138898
Extent Type: Range
Extent Start Date/Time: 2007-02-18
Extent End Date/Time: 2007-05-20
Source Contribution:

Not provided | Source Geospatial Form: globe | Type of Source Media: hard drive

Process Steps

Process Step 1

CC ID: 1138899
Description:

These data were collected using the CHARTS system. It is owned by the Naval Oceanographic Office and Operated through contract. The system collects topographic lidar data at 20 kHz and hydrographic data at 3 kHz. The system also collects RGB imagery at 1Hz. A CASI-1500 hyperspectral line scanner is integrated with the system as well. Aircraft position, velocity and acceleration information are collected through a combination of Novatel and POS A/V equipment. Raw data are collected and transferred to the office for downloading and processing in SHOALS GCS software. GPS data are processed using POSPac software and the results are combined with the lidar data to produce 3-D positions for each lidar shot.

These data are edited using Fledermaus software where anomalous data are removed from the dataset. The edited data are written to the national grid system 1 km tiles using chartsLAS, a program written by NAVO. This program reads data from the original binary format files and produces separate ASCII files for first and last return data. Using a model calculated by NAVO, data were converted from ellipsoid to Mean Sea Level heights using the program datum_shift, written by NAVO. The LAS files output from chartsLAS were read into TerraScan and filters were applied to classify ground points. Points designated as ground are assigned a classification value "2" and all other points are assigned the classification value "1" which represents an unclassified state.

Process Date/Time: 2007-11-14 00:00:00

Process Step 2

CC ID: 1138900
Description:

The NOAA Office for Coastal Management (OCM) received files in LAS format. The files contained LiDAR intensity and elevation measurements.

OCM performed the following processing on the data for storage and provisioning purposes within Digital Coast:

1. The data were converted from UTM coordinates to geographic coordinates.

2. The bathymetric lidar classifications were set to class 11.

3. The LAS georeference header files were set to reflect the tidal vertical datums.

4. The LAS header fields were sorted by latitude and updated.

5. OCM exported the laz files to contours, converting into a polygon shapefile. OCM then used this polygon as a sea and land interface, classifying upland class 11 (bathymetric points) to class 14 (Green Topo, upland topography collected with the green laser which collected class 11); the sensor used to collect bathymetric lidar also collects topography upland but the newest classification shows the inaccurately mapped upland topography as class 14 points.

Process Date/Time: 2014-08-01 00:00:00
Process Contact: NOAA Office for Coastal Management (NOAA/OCM)
Phone (Voice): (843) 740-1202
Email Address: coastal.info@noaa.gov

Catalog Details

Catalog Item ID: 50065
GUID: gov.noaa.nmfs.inport:50065
Metadata Record Created By: Anne Ball
Metadata Record Created: 2017-11-15 15:24+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2022-08-09 17:11+0000
Metadata Record Published: 2022-03-16
Owner Org: OCMP
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Last Review Date: 2022-03-16
Metadata Review Frequency: 1 Year
Metadata Next Review Date: 2023-03-16