50065
2007 Joint Airborne Lidar Bathymetry Technical Center of Expertise (JALBTCX) Topobathy Lidar: Guam
usace2007_guam_m551_metadata
Data Set
Published / External
49401
Lidar - partner (no harvest)
Project
Completed
2007-12-11
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).
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.
10709
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
Theme
ISO 19115 Topic Category
elevation
Temporal
February 2007
Office for Coastal Management
Charleston
SC
Data Set
As Needed
Any conclusions drawn from the analysis of this information are not the responsibility of JALBTCX, the Office for Coastal Management,
or its partners.
Acknowledgement of the Joint Airborne Lidar Bathymetry Technical Center of Expertise (JALBTCX) would be appreciated in any publications
or derived products.
Data Steward
2007-12-11
Organization
NOAA Office for Coastal Management
NOAA/OCM
coastal.info@noaa.gov
2234 South Hobson Ave
Charleston
SC
29405-2413
(843) 740-1202
https://coast.noaa.gov
NOAA Office for Coastal Management Home Page
Online Resource
Distributor
2007-12-11
Organization
NOAA Office for Coastal Management
NOAA/OCM
coastal.info@noaa.gov
2234 South Hobson Ave
Charleston
SC
29405-2413
(843) 740-1202
https://coast.noaa.gov
NOAA Office for Coastal Management Home Page
Online Resource
Metadata Contact
2007-12-11
Organization
NOAA Office for Coastal Management
NOAA/OCM
coastal.info@noaa.gov
2234 South Hobson Ave
Charleston
SC
29405-2413
(843) 740-1202
https://coast.noaa.gov
NOAA Office for Coastal Management Home Page
Online Resource
Point of Contact
2007-12-11
Organization
NOAA Office for Coastal Management
NOAA/OCM
coastal.info@noaa.gov
2234 South Hobson Ave
Charleston
SC
29405-2413
(843) 740-1202
https://coast.noaa.gov
NOAA Office for Coastal Management Home Page
Online Resource
Ground Condition
144.616616
144.962572
13.654497
13.229483
Range
2007-02-18
2007-05-20
Unclassified
This data can be obtained on-line at the following URL: https://coast.noaa.gov/dataviewer;
None
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.
https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=551
Customized Download
Create custom data files by choosing data area, product type, map projection, file format, datum, etc.
https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/msl/551/index.html
Bulk Download
Simple download of data files.
2016-05-23
Date that the source FGDC record was last modified.
2017-11-14
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.
2018-02-08
Partial upload of Positional Accuracy fields only.
2018-03-13
Partial upload to move data access links to Distribution Info.
These data are not attributed. | Quantitative Value: N/A | Quantitative Test Explanation: These data are not attributed.
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
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
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.
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.
2007 HI Guam CHARTS Survey
Range
2007-02-18
2007-05-20
Not provided | Source Geospatial Form: globe | Type of Source Media: hard drive
1
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.
2007-11-14T00:00:00
2
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.
2014-08-01T00:00:00
Organization
NOAA Office for Coastal Management
NOAA/OCM
coastal.info@noaa.gov
2234 South Hobson Ave
Charleston
SC
29405-2413
(843) 740-1202
https://coast.noaa.gov
NOAA Office for Coastal Management Home Page
Online Resource
gov.noaa.nmfs.inport:50065
Anne Ball
2017-11-15T15:24:04
SysAdmin InPortAdmin
2022-08-09T17:11:37
2022-03-16
OCM Partners
OCMP
1002
Public
No
2022-03-16
1 Year
2023-03-16