2022 NOAA NGS Topobathy Lidar DEM of Ofu and Olosega, American Samoa
National Geodetic Survey
Data Set
(DS)
| ID: 72129
| Published / External
Created: 2024-02-13
|
Last Modified: 2024-03-26
Project (PRJ) | ID: 59025
ID: 72129
Data Set (DS)
* Discovery• First Pass
» Metadata Rubric
Item Identification
| * » Title | 2022 NOAA NGS Topobathy Lidar DEM of Ofu and Olosega, American Samoa |
|---|---|
| Short Name | |
| * Status | Completed |
| Creation Date | 2024 |
| Revision Date | |
| • Publication Date | |
| * » Abstract |
This data was collected by Woolpert using a Leica HawkEye 4X sensor. The data was acquired from 20221022 - 20221202. The data includes topobathy data in LAS 1.4 format 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 project specifications. The lidar data in ellipsoid heights was used to create the final topobathymetric DEMs in ellipsoid heights. Lidar data classes 2, 40 and 43 were used to generate a raster in geotiff format, with 1 meter pixel resolution for the entire area. The raster was then clipped to the tile grid and named according to project specifications to result in tiled 5000m x 5000m topobathymetric DEMs. The project consists of approximately 53 square kilometers of data collected in Ofu-Olesega, American Samoa. This dataset contains 6 5000 m x 5000 m raster tiles. |
| * 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. |
| Notes | |
| Other Citation Details | |
| • Supplemental Information |
The full workflow used for this project is found in the final project report submitted to NOAA. |
| DOI (Digital Object Identifier) | |
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| DOI Issue Date |
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 |
Temporal Keywords
| Thesaurus | Keyword |
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* Spatial Keywords
| Thesaurus | Keyword |
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| Global Change Master Directory (GCMD) Location Keywords | OCEAN > PACIFIC OCEAN > CENTRAL PACIFIC OCEAN > AMERICAN SAMOA |
Stratum Keywords
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Instrument Keywords
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Platform Keywords
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Physical Location
| • » Organization | Office for Coastal Management |
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| • » City | Charleston |
| • » State/Province | SC |
| • Country | |
| • » Location Description |
Data Set Information
| * Data Set Scope Code | Data Set |
|---|---|
| • Data Set Type | Elevation |
| • Maintenance Frequency | None Planned |
| Maintenance Note | |
| » Data Presentation Form | Model (digital) |
| • Entity Attribute Overview | |
| Entity Attribute Detail Citation | |
| Entity Attribute Detail URL | |
| 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
| * » Support Role | Data Steward |
|---|---|
| * » Date Effective From | 2024 |
| Date Effective To | |
| 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 |
| Fax | |
| Mobile | |
| URL | https://coast.noaa.gov |
| Business Hours | |
| Contact Instructions |
| * » Support Role | Distributor |
|---|---|
| * » Date Effective From | 2024 |
| Date Effective To | |
| 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 |
| Fax | |
| Mobile | |
| URL | https://coast.noaa.gov |
| Business Hours | |
| Contact Instructions |
| * » Support Role | Metadata Contact |
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| * » Date Effective From | 2024 |
| Date Effective To | |
| 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 |
| Fax | |
| Mobile | |
| URL | https://coast.noaa.gov |
| Business Hours | |
| Contact Instructions |
| * » Support Role | Originator |
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| * » Date Effective From | 2024 |
| Date Effective To | |
| Organization | National Geodetic Survey (NGS) |
| Address |
1315 East-West Hwy Silver Spring, MD 20910 |
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| URL | https://geodesy.noaa.gov/ |
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Extents
| Currentness Reference | Ground Condition |
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Extent Group 1
| Extent Description |
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Extent Group 1 / Geographic Area 1
| * » W° Bound | -169.72 |
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| * » E° Bound | -169.54 |
| * » N° Bound | -14.12 |
| * » S° Bound | -14.21 |
| * » Description |
Extent Group 1 / Vertical Extent
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Extent Group 1 / Time Frame 1
| * » Time Frame Type | Range |
|---|---|
| * » Start | 2022-10-22 |
| End | 2022-12-02 |
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Spatial Information
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Spatial Representation
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| Vector Representation Used? | Yes |
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Reference Systems
Reference System
| EPSG Code | EPSG:6636 | ||||||||||||||||||||||||||||
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Access Information
| Data License | |
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| Data License Statement | |
| * » Security Class | Unclassified |
| * Security Classification System | |
| Security Handling Description | |
| • Data Access Policy | |
| » Data Access Procedure | |
| • » 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. |
| Metadata Access Constraints | |
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Distribution Information
| Start Date | 2024 |
|---|---|
| End Date | Present |
| » Download URL | https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=10084 |
| 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 Date/Time | |
| File Type (Deprecated) | ZIP |
| Distribution Format | Not Applicable |
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| Compression | Zip |
| Review Status |
| Start Date | 2024 |
|---|---|
| End Date | Present |
| » Download URL | https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/dem/NGS_Ofu_Olesega_AS_Topobathy_2022_10084/index.html |
| Distributor | NOAA Office for Coastal Management (NOAA/OCM) (2024 - Present) |
| File Name | Bulk Download |
| Description |
Simple download of data files. |
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| File Type (Deprecated) | LAZ |
| Distribution Format | GeoTIFF |
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Archive Information
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URLs
| URL | https://coast.noaa.gov/dataviewer |
|---|---|
| Name | Digital Coast Data Access Viewer |
| URL Type | Online Resource |
| File Resource Format | |
| Description |
| URL | https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/10083/supplemental/AS2201_AmericanSamoa_QualityAssuranceReport.pdf |
|---|---|
| Name | Topobathy Lidar Data Report |
| URL Type | Online Resource |
| File Resource Format | |
| Description |
Topobathymetric Lidar Data Report |
| URL | https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/10083/supplemental/extent_AS_ofuolosega_m10083.kmz |
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| Name | Browse Graphic |
| URL Type | Browse Graphic |
| File Resource Format | kmz |
| Description |
This graphic shows the lidar footprint for this dataset. |
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Activity Log
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Issues
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Technical Environment
| Description |
OS Independent |
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Data Quality
| Representativeness | |
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| Accuracy | |
| Analytical Accuracy | |
| Horizontal Positional Accuracy |
Woolpert performed acquisition and calibration of all lidar data, as well as classification, generation of derivative products, and absolute positional accuracy computation. The DEMs are derived from the source lidar and inherit the accuracy of the source data. The DEMs are created using controlled and tested methods to limit the amount of error introduced during DEM production. |
| Vertical Positional Accuracy |
Woolpert performed acquisition and calibration of all lidar data, as well as classification, generation of derivative products, and absolute positional accuracy computation. The DEMs are derived from the source lidar and inherit the accuracy of the source data. The DEMs are created using controlled and tested methods to limit the amount of error introduced during DEM production. The results of the comparison of the topo ground control points with the Ofu Olesega point cloud showed good agreement with an average dZ of 0.001m. The comparison of NVA and FVA check points to the point cloud showed similar results. The NVA points had an RMSE of 0.04m from the point cloud and the FVA at 95th percent confidence level in open terrain using RMSE (z) x 1.9600 was 0.078m. |
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| Conceptual Consistency |
Not applicable |
| » Quality Control Procedures Employed |
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 |
| » Is Access to the Data Limited Based on an Approved Waiver? | |
| » If Distributor (Data Hosting Service) is Needed, Please Indicate | |
| » Approximate Delay Between Data Collection and Dissemination | |
| » If Delay is Longer than Latency of Automated Processing, Indicate Under What Authority Data Access is Delayed | |
| » Actual or Planned Long-Term Data Archive Location | NCEI-CO |
| » Approximate Delay Between Data Collection and Archiving | |
| » 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
| » Lineage Statement |
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Sources
| Citation Title | Acquisition and Processing |
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| Contact Role Type | Originator |
| Contact Type | Organization |
| Contact Name | Woolpert |
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Process Steps
| Process Step Number | 1 |
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| » 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. |
| Process Date/Time | 2023-07-31 00:00:00 |
| Process Contact | National Geodetic Survey (NGS) |
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| Process Step Number | 2 |
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| » Description |
The final classification scheme 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 The lidar data is referenced to the NAD83 (PA11) ellipsoid. The lidar data in ellipsoid heights was used to create the final topobathymetric DEMs in ellipsoid heights. Lidar data classes 2, 40 and 43 were used to generate a raster in geotiff format, with 1 meter pixel resolution for the entire area. The raster was then clipped to the tile grid and named according to project specifications to result in tiled 5000m x 5000m topobathymetric DEMs. Bathy void polygons represent bathymetric areas with no bathymetric bottom returns and accompany the DEMs. Void polygon creation is described in the final project report. |
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| Process Contact | National Geodetic Survey (NGS) |
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Acquisition Information
Instruments
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Platforms
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Child Items
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Related Items
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Catalog Details
| Catalog Item ID | 72129 |
|---|---|
| Metadata Record Created By | Maryellen Sault |
| Metadata Record Created | 2024-02-13 16:04+0000 |
| Metadata Record Last Modified By | Blake Waring |
| » Metadata Record Last Modified | 2024-03-26 20:13+0000 |
| Metadata Record Published | 2024-02-27 |
| Owner Org | NGS |
| Metadata Publication Status | Published Externally |
| Do Not Publish? | N |
| Metadata Workflow State | Published / External |
| Metadata Last Review Date | 2022-04-11 |
| Metadata Review Frequency | 3 Years |
| Metadata Next Review Date | 2025-04-11 |
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