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NGS Metadata Library > NGS Lidar >

2021 NOAA NGS Topobathy Lidar: Niihau, Hawaii

Data Set (DS)  |  National Geodetic Survey (NGS)
GUID: gov.noaa.nmfs.inport:73749  |  Updated: October 30, 2024  |  Published / External 
Summary
Item Identification
Keywords
Physical Location
Data Set Info
Support Roles
Extents
Spatial Info
Access Info
Distribution Info
URLs
Tech Environment
Data Quality
Data Management
Lineage
Catalog Details

Summary

Browse Graphic

Short Citation
National Geodetic Survey, 2024: 2021 NOAA NGS Topobathy Lidar: Niihau, Hawaii, https://www.fisheries.noaa.gov/inport/item/73749.
Full Citation Examples

Abstract

These data were collected by Woolpert using a Leica Hawkeye4X system. Data for Niihau were acquired from September 8, 2021 through September 26, 2021.

The data includes topobathy data in an LAS 1.4 format file classified as unclassified (1), ground (2), low noise (7), topo water surface (9), high noise (18), bathymetric point (40), bathymetric water surface (41), synthetic derived water surface (42), submerged object (43), International Hydrographic Organization (IHO) S-57 object (44), submerged aquatic vegetation (64), and bathymetric bottom temporal changes (65) in accordance with the American Society for Photogrammetry and Remote Sensing (ASPRS) classification standards.

This data set may also include lidar intensity values and encoded RGB image values.

Distribution Information

  • Customized Download

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

  • Bulk Download
    LAS/LAZ - LASer

    Simple download of data files.

Access Constraints:

None

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be aware that temporal changes may have occurred since this data set was collected and some parts of this data may no longer represent actual surface conditions.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.

Controlled Theme Keywords

COASTAL BATHYMETRY, COASTAL ELEVATION, elevation, TOPOGRAPHICAL RELIEF MAPS

Child Items

No Child Items for this record.

Contact Information

Metadata Contact
NOAA Office for Coastal Management (NOAA/OCM)
coastal.info@noaa.gov
(843) 740-1202
https://coast.noaa.gov

Extents

Geographic Area 1

-160.28° W, -160° E, 22.06° N, 21.72° S

Time Frame 1
2021-09-08 - 2021-09-26

Item Identification

Title: 2021 NOAA NGS Topobathy Lidar: Niihau, Hawaii
Status: Completed
Creation Date: 2024-10
Abstract:

These data were collected by Woolpert using a Leica Hawkeye4X system. Data for Niihau were acquired from September 8, 2021 through September 26, 2021.

The data includes topobathy data in an LAS 1.4 format file classified as unclassified (1), ground (2), low noise (7), topo water surface (9), high noise (18), bathymetric point (40), bathymetric water surface (41), synthetic derived water surface (42), submerged object (43), International Hydrographic Organization (IHO) S-57 object (44), submerged aquatic vegetation (64), and bathymetric bottom temporal changes (65) in accordance with the American Society for Photogrammetry and Remote Sensing (ASPRS) classification standards.

This data set may also include lidar intensity values and encoded RGB image values.
Purpose:

This data was collected to provide topographic/bathymetric lidar data, digital imagery, and digital shoreline for National Oceanic and Atmospheric Administration (NOAA) nautical charts and other uses.
Supplemental Information:

Data include all lidar returns. Outliers or false returns (e.g., returns from birds, atmospheric particles, and/or system noise) may be present in the data. An automated ground classification algorithm was used to determine bare earth point classification. It should be noted that not all returns were correctly classified; therefore the user should examine for acceptability.

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 > BATHYMETRY > COASTAL BATHYMETRY
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > OCEANS > COASTAL PROCESSES > COASTAL ELEVATION
ISO 19115 Topic Category
elevation

Spatial Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Location Keywords
OCEAN > PACIFIC OCEAN > CENTRAL PACIFIC OCEAN > HAWAIIAN ISLANDS

Instrument Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Instrument Keywords
LIDAR > Light Detection and Ranging

Platform Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Platform Keywords
Airplane > Airplane

Physical Location

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

Data Set Information

Data Set Scope Code: Data Set
Data Set Type: Elevation
Maintenance Frequency: None Planned
Data Presentation Form: Model (digital)
Distribution Liability:

Any conclusions drawn from the analysis of this information are not the responsibility of NOAA, the National Geodetic Survey, the Office for Coastal Management, or its partners.
Data Set Credit: We request that you credit the National Oceanic and Atmospheric Administration (NOAA) when you use these data in a report, publication, or presentation.

Support Roles

Data Steward

CC ID: 1351265
Date Effective From: 2024
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: 1351266
Date Effective From: 2024
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: 1351267
Date Effective From: 2024
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

Originator

CC ID: 1351268
Date Effective From: 2024
Date Effective To:
Contact (Organization): National Geodetic Survey (NGS)
Address: 1315 East-West Hwy
Silver Spring, MD 20910
URL: https://geodesy.noaa.gov/

Extents

Currentness Reference: Ground Condition

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 1351291
W° Bound: -160.28
E° Bound: -160
N° Bound: 22.06
S° Bound: 21.72

Extent Group 1 / Time Frame 1

CC ID: 1351290
Time Frame Type: Range
Start: 2021-09-08
End: 2021-09-26

Spatial Information

Spatial Representation

Representations Used

Vector: Yes

Reference Systems

Reference System 1

CC ID: 1351276

Coordinate Reference System
CRS Type: Geographic 3D
EPSG Code: EPSG:6321
EPSG Name: NAD83(PA11)
▾ See Full Coordinate Reference System Information

Access Information

Security Class: Unclassified
Data Access Procedure:

Data is available online for bulk and custom downloads.
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: 1351269
Start Date: 2023
End Date: Present
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=10192
Distributor: NOAA Office for Coastal Management (NOAA/OCM) (2024 - Present)
File Name: Customized Download
Description:

Create custom data files by choosing data area, product type, map projection, file format, datum, etc.
File Type (Deprecated): ZIP
Compression: LAZ

Distribution 2

CC ID: 1351270
Start Date: 2023
End Date: Present
Download URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/10192/index.html
Distributor: NOAA Office for Coastal Management (NOAA/OCM) (2024 - Present)
File Name: Bulk Download
Description:

Simple download of data files.
File Type (Deprecated): LAZ
Distribution Format: LAS/LAZ - LASer

URLs

URL 1

CC ID: 1351271
URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/10192/supplemental/extent_ngs_niihau_2021_m10192.kmz
Name: Browse Graphic
URL Type:
Browse Graphic
File Resource Format: kmz
Description:

This graphic shows the lidar footprint for this dataset.

Technical Environment

Description:

OS Independent

Data Quality

Horizontal Positional Accuracy:

The horizontal accuracy of the data is better than plus or minus 1.0 m.
Vertical Positional Accuracy:

Data used to test the lidar was collected with Static GPS Observations and compared against the published data. The vertical accuracy of the data is better than plus or minus 0.15 m at 1 sigma.
Conceptual Consistency:

Not applicable

Data Management

Have Resources for Management of these Data Been Identified?: Yes
Approximate Percentage of Budget for these Data Devoted to Data Management: Unknown
Do these Data Comply with the Data Access Directive?: Yes
Actual or Planned Long-Term Data Archive Location: NCEI-CO
How Will the Data Be Protected from Accidental or Malicious Modification or Deletion Prior to Receipt by the Archive?:

Data is backed up to tape and to cloud storage.

Lineage

Sources

Acquisition and Processing

CC ID: 1351277
Contact Role Type: Originator
Contact Type: Organization
Contact Name: Woolpert

Process Steps

Process Step 1

CC ID: 1351278
Description:

Woolpert acquired, calibrated, and performed the refraction correction of the lidar data. Light travels at different speeds in air versus water and its direction of travel or angle is changed or refracted when entering the water column. The refraction correction process corrects for this difference by adjusting the depth (distance traveled) and horizontal position (change of angle/direction) of the lidar data acquired within water.

Relative accuracy of the swaths compared to overlapping and adjacent swaths was verified through the use of Delta-Z (DZ) orthos created in LASTools software. Profiles of elevated planar features, such as roofs, were used to verify horizontal alignment between overlapping swaths.

The NovAtel software was utilized for GPS and inertial processing, Data were processed to an initial LAS format using the Leica Lidar Survey Studio software.

Algorithms in TerraScan was used to create the initial ground surface.

All lidar data was peer-reviewed. QAQC also included creating void polygons for use during review. All necessary edits were applied to the dataset. LASTools was used to update LAS header information, including all projection and coordinate reference system information. The final lidar data is in LAS format 1.4 and point data record format 6.

Data were processed in NAD83 (PA11) horizontal and vertical datum. The National Oceanic and Atmospheric Administration (NOAA) received files in laz format.

The files contained lidar elevation and intensity measurements.

Data for Niihau, HI was delivered in UTM Zone 4 coordinates and ellipsoid elevations in meters.

Horizontal Datum-NAD83 (PA11) epoch: 2010.0

Projection-UTM Zone 4 North

Horizontal Units-meters

Vertical Datum-NAD83 (PA11) Ellipsoid height

Vertical Units-meters

The final classification scheme for all data delivered to NOAA is as follows:

1-Unclassified

2-Ground

7-Low Noise

9-Topo Water Surface

18-High Noise

40-Bathymetric Point

41-Bathymetric Water Surface

42-Synthetic Derived Water Surface

43-Submerged Object

44-International Hydrographic Organization (IHO) S-57 Object

64-Submerged Aquatic Vegetation

65-Bathymetric Bottom Temporal Changes
Process Date/Time: 2024-01-17 00:00:00
Process Contact: National Geodetic Survey (NGS)

Process Step 2

CC ID: 1351279
Description:

The NOAA Office for Coastal Management (OCM) received files in laz format. The files contained lidar elevation and intensity measurements from French Frigate Shoals, Nihoa and Niihau, Hawaii. The data were in UTM Zone 4 coordinates and ellipsoid elevations in meters.

OCM performed the following processing on the data for Digital Coast storage and provisioning purposes: 1. Converted from UTM to geographic coordinates 2. Sorted by gps time

Process Date/Time: 2024-10-22 00:00:00
Process Contact: Office for Coastal Management (OCM)

Catalog Details

Catalog Item ID: 73749
GUID: gov.noaa.nmfs.inport:73749
Metadata Record Created By: Blake Waring
Metadata Record Created: 2024-10-28 18:39+0000
Metadata Record Last Modified By: Blake Waring
Metadata Record Last Modified: 2024-10-30 19:02+0000
Metadata Record Published: 2024-10-30
Owner Org: NGS
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Last Review Date: 2022-04-11
Metadata Review Frequency: 3 Years
Metadata Next Review Date: 2025-04-11