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OCM Metadata Library > Raster > DEMs >

2017 NOAA/MCP Topobathy Lidar DEM: Blue Hill Bay, ME - Riegl Sensor

Data Set (DS)  |  Office for Coastal Management (OCM)
GUID: gov.noaa.nmfs.inport:52605  |  Updated: January 10, 2024  |  Published / External 
Summary
Item Identification
Keywords
Physical Location
Data Set Info
Support Roles
Extents
Access Info
Distribution Info
URLs
Data Quality
Lineage
Catalog Details

Summary

Browse graphic

Short Citation
Office for Coastal Management, 2024: 2017 NOAA/MCP Topobathy Lidar DEM: Blue Hill Bay, ME - Riegl Sensor, https://www.fisheries.noaa.gov/inport/item/52605.
Full Citation Examples

Abstract

Fugro was contracted in July 2017 by the State of Maine Department of Marine Resources (SMDMR), Maine Coastal Program (MCP), and the NOAA Office for Coastal Management (OCM) to conduct an Airborne LiDAR Bathymetry (ALB) survey in the vicinity of Blue Hill Bay in Maine, and to deliver fully processed and verified hydrographic survey data.The ALB survey was conducted with the SHOALS-1000T and Riegl VQ-820-G lidar systems in a concurrent acquisition. The SHOALS system, with a high power laser, provided the better probability for deep sounding detections at a reduced point density (about 0.15 pts/m2); whilst the Riegl VQ-820-Q provided high density coverage (up to 8.5 pts/m2) but at reduced depth detection.

This metadata record describes the bare earth, 1 meter digital elevation model (DEM) created from the topographic and bathymetric LiDAR elevations generated from data collected with the Riegl VQ-820-Q LiDAR system along Blue Hill Bay on the coastline of Maine. These files contain topographic and bathymetric LiDAR elevations generated from data collected with the Riegl VQ-820-G LiDAR system along Blue Hill Bay on the coastline of Maine. Data were collected by Fugro for NOAA OCM. The Riegl VQ-820-G system is a a bathymetric LiDAR sensor for use in coastal mapping and charting activities because the laser's ability to penetrate the water column and detect targets up to 1 time the Secchi disk depth. Survey coverage is based on a delimiting polygon provided by NOAA OCM, which envelopes the area between the 0 m contour (NAVD88) down to approximated -10 meters. Riegl VQ-820-G data were processed on Riegl RiProcess software for: point cloud generation, boresight calibration, water surface classification and modeling, refraction correction; and exported with a minimal classification LAS format v1.4 for delivery. Additional classification was performed after delivery to extract ground and bathymetric points.

In addition to these bare earth Digital Elevation Model (DEM) data, the lidar point data that these DEM data were created from, are also available. These data are available for custom download at the link provided in the URL section of this metadata record.

A link to custom download the bare earth DEM that was created from the concurrently collected topographic and bathymetric data (collected with the SHOALS-1000T lidar system) is provided in the URL section of this metadata record.

Distribution Information

  • Create custom data files by choosing data area, file format, datum, etc. A new metadata will be produced to reflect your request using this record as a base.

  • Bulk download of data files in orthometric heights in meters.

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 ELEVATION, elevation, imageryBaseMapsEarthCover, oceans, SEAFLOOR TOPOGRAPHY, TERRAIN ELEVATION

Child Items

No Child Items for this record.

Contact Information

Point of Contact
NOAA Office for Coastal Management (NOAA/OCM)
coastal.info@noaa.gov
(843) 740-1202

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

Extents

Geographic Area 1

-68.566° W, -68.432° E, 44.313° N, 44.194° S

Time Frame 1
2017-06-29 - 2017-07-05

Dates of collection: June 29, July 5, 2017

Item Identification

Title: 2017 NOAA/MCP Topobathy Lidar DEM: Blue Hill Bay, ME - Riegl Sensor
Short Name: me2017_blue_hill_bay_dem_riegl_m8257_metadata
Status: Completed
Abstract:

Fugro was contracted in July 2017 by the State of Maine Department of Marine Resources (SMDMR), Maine Coastal Program (MCP), and the NOAA Office for Coastal Management (OCM) to conduct an Airborne LiDAR Bathymetry (ALB) survey in the vicinity of Blue Hill Bay in Maine, and to deliver fully processed and verified hydrographic survey data.The ALB survey was conducted with the SHOALS-1000T and Riegl VQ-820-G lidar systems in a concurrent acquisition. The SHOALS system, with a high power laser, provided the better probability for deep sounding detections at a reduced point density (about 0.15 pts/m2); whilst the Riegl VQ-820-Q provided high density coverage (up to 8.5 pts/m2) but at reduced depth detection.

This metadata record describes the bare earth, 1 meter digital elevation model (DEM) created from the topographic and bathymetric LiDAR elevations generated from data collected with the Riegl VQ-820-Q LiDAR system along Blue Hill Bay on the coastline of Maine. These files contain topographic and bathymetric LiDAR elevations generated from data collected with the Riegl VQ-820-G LiDAR system along Blue Hill Bay on the coastline of Maine. Data were collected by Fugro for NOAA OCM. The Riegl VQ-820-G system is a a bathymetric LiDAR sensor for use in coastal mapping and charting activities because the laser's ability to penetrate the water column and detect targets up to 1 time the Secchi disk depth. Survey coverage is based on a delimiting polygon provided by NOAA OCM, which envelopes the area between the 0 m contour (NAVD88) down to approximated -10 meters. Riegl VQ-820-G data were processed on Riegl RiProcess software for: point cloud generation, boresight calibration, water surface classification and modeling, refraction correction; and exported with a minimal classification LAS format v1.4 for delivery. Additional classification was performed after delivery to extract ground and bathymetric points.

In addition to these bare earth Digital Elevation Model (DEM) data, the lidar point data that these DEM data were created from, are also available. These data are available for custom download at the link provided in the URL section of this metadata record.

A link to custom download the bare earth DEM that was created from the concurrently collected topographic and bathymetric data (collected with the SHOALS-1000T lidar system) is provided in the URL section of this metadata record.
Purpose:

Conduct an Airborne Bathymetric LiDAR survey over Blue Hill Bay and deliver point cloud data correctly georeferenced and processed for refraction correction of underwater points. Bathymetric data will be used for improving digital elevation models and mapping to characterize nearshore benthic habitats; improve coastal flood inundation predictions; and provide accurate topographic/bathymetric digital elevation models for modeling, engineering, and planning needs.
Supplemental Information:

Water turbidity conditions at the time of survey prevented full bottom coverage results on the assigned areas. Every effort was made to recover as much valid point depths; gaps in the coverage are mostly caused by negative bottom detection or by the removal of data below the accuracy tolerance.

Keywords

Theme Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION
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
ISO 19115 Topic Category
imageryBaseMapsEarthCover
ISO 19115 Topic Category
oceans
UNCONTROLLED
None beach
None DEM
None erosion
None National Oceanic and Atmospheric Administration
None Point data
None VQ-820-G

Spatial Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Location Keywords
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > MAINE
Global Change Master Directory (GCMD) Location Keywords
VERTICAL LOCATION > LAND SURFACE
Global Change Master Directory (GCMD) Location Keywords
VERTICAL LOCATION > SEA FLOOR
UNCONTROLLED
Geographic Names Information System Blue Hill Bay
Geographic Names Information System U.S. East Coast

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
Global Change Master Directory (GCMD) Platform Keywords
DEM > Digital Elevation Model

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: As Needed
Data Presentation Form: Model (digital)
Distribution Liability:

Any conclusions drawn from the analysis of this information are not the responsibility of NOAA, the Office for Coastal Management or its partners.
Data Set Credit: National Oceanic and Atmospheric Administration and the Maine Coastal Program

Support Roles

Data Steward

CC ID: 753837
Date Effective From: 2018
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: 753838
Date Effective From: 2018
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: 753839
Date Effective From: 2018
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: 753840
Date Effective From: 2018
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: 1290998
W° Bound: -68.566
E° Bound: -68.432
N° Bound: 44.313
S° Bound: 44.194

Extent Group 1 / Time Frame 1

CC ID: 1290997
Time Frame Type: Range
Start: 2017-06-29
End: 2017-07-05
Description:

Dates of collection: June 29, July 5, 2017

Access Information

Security Class: Unclassified
Data Access Procedure:

Data is available online for custom and bulk 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: 753841
Start Date: 2018
End Date: Present
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=8527
Distributor:
File Name: Customized Download
Description:

Create custom data files by choosing data area, file format, datum, etc. A new metadata will be produced to reflect your request using this record as a base.
Compression: Zip

Distribution 2

CC ID: 753842
Start Date: 2018
End Date: Present
Download URL: https://noaa-nos-coastal-lidar-pds.s3.us-east-1.amazonaws.com/dem/ME_Blue_Hill_Bay_Riegl_DEM_2017_8527/index.html
Distributor: NOAA Office for Coastal Management (NOAA/OCM) (2018 - Present)
File Name: Bulk Download
Description:

Bulk download of data files in orthometric heights in meters.

URLs

URL 1

CC ID: 753843
URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=8525
URL Type:
Online Resource
Description:

Link to custom download the lidar point data from which these raster Digital Elevation Model (DEM) data were created.

URL 2

CC ID: 753844
URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=8528
URL Type:
Online Resource
Description:

Link to custom download the DEM created from the concurrently collected topographic and bathymetric data (collected with the SHOALS 1000-T lidar system).

URL 3

CC ID: 753845
URL: https://coast.noaa.gov/
Name: NOAA's Office for Coastal Management (OCM) website
URL Type:
Online Resource
File Resource Format: HTML
Description:

Information on the NOAA Office for Coastal Management (OCM)

URL 4

CC ID: 753846
URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/8525/supplemental/me2017_blue_hill_bay_riegl_m8525.kmz
Name: Browse graphic
URL Type:
Browse Graphic
File Resource Format: KML
Description:

This graphic displays the footprint for this lidar data set.

URL 5

CC ID: 753847
URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/8525/supplemental/me2017_blue_hill_bay_riegl_m8525_report.pdf
Name: Dataset report
URL Type:
Online Resource
File Resource Format: PDF
Description:

Link to data set report.

URL 6

CC ID: 753848
URL: https://coast.noaa.gov/dataviewer/
Name: NOAA's Office for Coastal Management (OCM) Data Access Viewer (DAV)
URL Type:
Online Resource
File Resource Format: HTML
Description:

The Data Access Viewer (DAV) allows a user to search for and download elevation, imagery, and land cover data for the coastal U.S. and its territories. The data, hosted by the NOAA Office for Coastal Management, can be customized and requested for free download through a checkout interface. An email provides a link to the customized data, while the original data set is available through a link within the viewer.

Data Quality

Horizontal Positional Accuracy:

The positions were obtained using post processed GNSS methods. The horizontal accuracy is better than ±0.366m at ground level above water.

Qualitative value: 0.366 meters at 2 sigma.
Vertical Positional Accuracy:

The vertical accuracy is better than ±0.27 m at laser exctintion level below water

Qualitative value: 0.27 meters at 2 sigma.
Completeness Report:

Gaps in coverage are due to water quality conditions at the time of survey.
Conceptual Consistency:

The data provided in these files were constricted to QL2B accuracy standards

Lineage

Process Steps

Process Step 1

CC ID: 1290992
Description:

The airborne raw files from the VQ-820-G sensor are downloaded into RIEGL LMS RiProcess version 1.8.3. The system collects bathymetric LiDAR data at 520 kHz Pulse Repetition Rate for an approximated point density of 8.5 pts/m2 at 400 m altitude (AGL) and 100 kts (speed over ground). Aircraft position, velocity, angular and acceleration information collected with an Applanix POS AV 510 v6 equipment were processed using Applanix POSPac v 7.1 software to produce a Smoothed Best Estimate Trajectory (SBET) solution file that is used by RiProcess to produce 3D positions for each LiDAR shot (point clouds). The RiProcess process also produced the automated and semi-automated clasification of water surface points to generate a water surface model for refraction correction of all lidar points underwater. Point clouds data was exported to LAS format were additional QC reviews were performed in external tools (Terrascan), including positioning adjustments to overlapping line data. Elevations referenced to NAVD88 datum were reduced with the application with VDatum v3.6.1. and GEOID12b. Data was exported to LAS format 1.4 for delivery. LAS data has a basic classification produced during the refraction correction process: Emerged and topographic points (1), Noise (7), Submerged Underwater points (40), Derived water surface (42). However, other than this necessary processing classification, the dataset has not been further classified or edited.

Process Step 2

CC ID: 1290993
Description:

The delivered LAS files were reviewed and processed to classify the point cloud and compute vertical accuracy. A variety of LAStools executables were used to tile the swaths, classify points (noise, ground, and bathymetric points), generate gridded products, and perform the final quantitative accuracy assessment. Global Mapper was used to perform qualitative assessments of the point clouds and gridded products at each step of the classification process. Ecognition was used to generate a water mask for extracting bathymetric points and identifying water surface and other non-bottom bathymetric points. ArcGIS Pro was used to organize and visualize all delivered products and generate web services for team reviews. The final classification includes class 1 (unclassified), class 2 (bare ground), class 7 (low noise), and class 40 (bathymetric point). Class 40 represents seafloor points. Class 1 on land includes all non-ground points (e.g., vegetation, buildings, powerlines). Class 1 in the water includes all non-bathymetric points (e.g., water surface, water column, floating submerged aquatic vegetation, and docks/piers).
Process Date/Time: 2018-02-01 00:00:00

Process Step 3

CC ID: 1290994
Description:

​The Riegl digital terrain model (DTM) was produced from the classified lidar points using LAStools. Points were filtered to keep only class 2 (ground) and class 40 (bathymetric point). The filtered points were used to construct a triangulated irregular network (TIN) with no triangles being built with edges longer than 10 meters. The TIN was then rasterized onto a 1 meter resolution digital elevation model (DEM).
Process Date/Time: 2018-04-02 00:00:00
Process Contact: Office for Coastal Management (OCM)

Process Step 4

CC ID: 1290995
Description:

The data were in UTM Zone 19 North coordinates and NAVD88 (Geoid12B) elevations in meters. The bare earth raster files were at a 1 meter grid spacing.

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

1. Copied the files to https.
Process Date/Time: 2018-05-10 00:00:00
Process Contact: Office for Coastal Management (OCM)

Catalog Details

Catalog Item ID: 52605
GUID: gov.noaa.nmfs.inport:52605
Metadata Record Created By: Rebecca Mataosky
Metadata Record Created: 2018-05-10 17:08+0000
Metadata Record Last Modified By: Kirk Waters
Metadata Record Last Modified: 2024-01-10 19:01+0000
Metadata Record Published: 2024-01-10
Owner Org: OCM
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