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

Office for Coastal Management
Data Set (DS) | ID: 52604 | Published / External
Created: 2018-05-10   |   Last Modified: 2024-07-24

Parent: DEMs
Project (PRJ) | ID: 47844

ID: 52604
Data Set (DS)

* Discovery
• First Pass
» Metadata Rubric

Item Identification

* » Title 2017 NOAA/MCP Topobathy Lidar DEM: Blue Hill Bay, ME - SHOALS Sensor
Short Name me2017_blue_hill_bay_dem_shoals_m8528_metadata
* Status Completed
Creation Date  
Revision Date  
• Publication Date  
* » 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 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, 2 meter digital elevation model (DEM) created from the topographic and bathymetric LiDAR elevations generated from data collected with the SHOALS-1000T LiDAR system along Blue Hill Bay on the coastline of Maine. Data were collected by Fugro for NOAA OCM. The SHOALS system is 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 2.5 times the Secchi disk depth. Survey coverage was based on a delimiting polygon provided by NOAA OCM, which envelopes the area between the 0 m contour (NAVD88) down to approximated -10 meters. An additional horizontal buffer of 100 meters from the 0 m contour expanded the survey area coverage to include the adjacent emerged topography. SHOALS data have been processed on Optech SHOALS-GCS and QPS Fledermaus software packages for: auto-processing; calibration, cleaning and editing, validation, basic classification, and exported to LAS format.

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 topographic and bathymetric reflectance raster are also available. These data are available for 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 Riegl VQ-820-G 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.
Notes
Other Citation Details
• 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.
DOI (Digital Object Identifier)  
DOI Registration Authority  
DOI Issue Date  

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
None beach
None DEM
None erosion
None National Oceanic and Atmospheric Administration
None Point data
None SHOALS
   
   
   

Temporal Keywords

Thesaurus Keyword
   
   
   

* 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
Geographic Names Information System Blue Hill Bay
Geographic Names Information System U.S. East Coast
   
   
   

Stratum Keywords

Thesaurus Keyword
   
   
   

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
• Country  
• » Location Description

Data Set Information

* Data Set Scope Code Data Set
• Data Set Type Elevation
• Maintenance Frequency As Needed
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 Office for Coastal Management or its partners.
Data Set Credit National Oceanic and Atmospheric Administration and the Maine Coastal Program

Support Roles

» At least one Distributor Org, one Metadata Contact, one Point of Contact, and one Data Steward should be listed.
* » Support Role Data Steward
* » Date Effective From 2018
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 2018
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
* » Date Effective From 2018
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 Point of Contact
* » Date Effective From 2018
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
* » Date Effective From
Date Effective To
* » Contact
* Contact Instructions
* » Support Role
* » Date Effective From
Date Effective To
* » Contact
* Contact Instructions
* » Support Role
* » Date Effective From
Date Effective To
* » Contact
* Contact Instructions

Extents

Currentness Reference Ground Condition

Extent Group 1

Extent Description

Extent Group 1 / Geographic Area 1

* » W° Bound -68.566
* » E° Bound -68.432
* » N° Bound 44.313
* » S° Bound 44.194
* » Description

Extent Group 1 / Vertical Extent

EPSG Code
Vertical Minimum
Vertical Maximum

Extent Group 1 / Time Frame 1

* » Time Frame Type Range
* » Start 2017-06-25
End 2017-07-05
Alternate Start As Of Info  
Alternate End As Of Info  
Description

Data collected: June 25, 29, July 5, 2017

Spatial Information

Spatial Resolution

Angular Distance  
Angular Distance Units  
Horizontal Distance  
Horizontal Distance Units  
Vertical Distance  
Vertical Distance Units  
Equivalent Scale Denominator  
Level of Detail Description  
 

Spatial Representation

Grid Representation Used?  
Vector Representation Used?  
Text / Table Representation Used?  
TIN Representation Used?  
Stereo Model Representation Used?  
Video Representation Used?  

Grid Representation

Dimension Count
Cell Geometry
Transformation Parameter Available?  

Axis Dimension
Dimension Type
Size
Resolution
Resolution Units
Resolution Type
Description

Axis Dimension
Dimension Type
Size
Resolution
Resolution Units
Resolution Type
Description

Vector Representation

Topology Level
Complex Object Present?  
Complex Object Count
Composite Object Present?  
Composite Object Count
Curve Object Present?  
Curve Object Count
Point Object Present?  
Point Object Count
Solid Object Present?  
Solid Object Count
Surface Object Present?  
Surface Object Count

Reference Systems

Reference System

EPSG Code

Horizontal Resolution
Horizontal Encoding Method
Latitude Resolution
Longitude Resolution
Coordinate X Resolution
Coordinate Y Resolution
Row Resolution
Column Resolution
Horizontal Units
Distance Resolution
Distance Units
Bearing Resolution
Bearing Units
Reference Direction
Reference Meridian

Vertical Resolution
Vertical Encoding Method
Vertical Resolution
Vertical Units

Access Information

Data License  
Data License URL  
Data License Statement
* » Security Class Unclassified
* Security Classification System
Security Handling Description
• Data Access Policy
» 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.
Metadata Access Constraints
Metadata Use Constraints

Distribution Information

Start Date 2018
End Date Present
» Download URL https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=8528
Distributor NOAA Office for Coastal Management (NOAA/OCM) (2018 - Present)
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.
File Date/Time  
File Type (Deprecated)  
Distribution Format Not Applicable
File Size  
Application Version  
Compression Zip
Review Status  
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_SHOALS_DEM_2017_8528/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.
File Date/Time  
File Type (Deprecated)  
Distribution Format GeoTIFF
File Size  
Application Version  
Compression Uncompressed
Review Status  
Start Date
End Date
» Download URL
Distributor
File Name
Description
File Date/Time
File Type
FGDC Content Type
File Size
Application Version
Compression
Review Status
Start Date
End Date
» Download URL
Distributor
File Name
Description
File Date/Time
File Type
FGDC Content Type
File Size
Application Version
Compression
Review Status
Start Date
End Date
» Download URL
Distributor
File Name
Description
File Date/Time
File Type
FGDC Content Type
File Size
Application Version
Compression
Review Status

Archive Information

Location
File Identifier
File Name
URL
Description
DOI
Archive Date
Archive Update Frequency
Location
File Identifier
File Name
URL
Description
DOI
Archive Date
Archive Update Frequency
Location
File Identifier
File Name
URL
Description
DOI
Archive Date
Archive Update Frequency

URLs

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.
URL https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/8526/supplemental/me2017_blue_hill_bay_shoals_m8526.kmz
Name Browse graphic
URL Type Browse Graphic
File Resource Format KML
Description

This graphic displays the footprint for this lidar data set.
URL https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/8526/supplemental/me2017_blue_hill_bay_shoals_m8526_report.pdf
Name Dataset report
URL Type Online Resource
File Resource Format PDF
Description

Link to data set report.
URL https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=8526
Name  
URL Type  
File Resource Format  
Description

Link to custom download the lidar point data from which these raster Digital Elevation Model (DEM) data were created.
URL https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/8526/supplemental/shoals_reflectance.zip
Name  
URL Type Online Resource
File Resource Format  
Description

Link to the bathymetric and topographic reflectance rasters.
URL https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=8527
Name  
URL Type Online Resource
File Resource Format  
Description

Link to custom download the DEM created from the concurrently collected topographic and bathymetric data (collected with the RIEGL VQ-820-G lidar system).
URL
Name
URL Type
File Resource Format
Description
URL
Name
URL Type
File Resource Format
Description
URL
Name
URL Type
File Resource Format
Description

Activity Log

Activity Time
Activity Type
Responsible Party
Description
Activity Time
Activity Type
Responsible Party
Description
Activity Time
Activity Type
Responsible Party
Description

Issues

Issue Date
Author
Issue
Issue Date
Author
Issue
Issue Date
Author
Issue

Technical Environment

Description  
 

Data Quality

Representativeness
Accuracy
Analytical Accuracy
Horizontal Positional Accuracy

The positions were obtained using post processed GNSS methods. The horizontal accuracy is better than ±4.49 m (2-sigma) at ground level above water.
Vertical Positional Accuracy

The vertical accuracy is better than ±0.70 m (2-sigma) at laser extinction level below water.
Quantitation Limits
Bias
Comparability
Completeness Measure
Precision
Analytical Precision
Field Precision
Sensitivity
Detection Limit
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 IHO SP-54 Order 1b accuracy standards.
» Quality Control Procedures Employed

Data Management

» Have Resources for Management of these Data Been Identified?  
» Approximate Percentage of Budget for these Data Devoted to Data Management  
» Do these Data Comply with the Data Access Directive?  
» 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  
» If World Data Center or Other, Specify  
» If To Be Determined, Unable to Archive, or No Archiving Intended, Explain  
 
» 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?  
 

Lineage

» Lineage Statement

Sources

Citation Title
Contact Role Type
Contact Type
Contact Name
Publish Date
Extent Type
Extent Start Date/Time
Extent End Date/Time
Citation URL
Citation URL Name
Citation URL Description
Scale Denominator
Citation Title
Contact Role Type
Contact Type
Contact Name
Publish Date
Extent Type
Extent Start Date/Time
Extent End Date/Time
Citation URL
Citation URL Name
Citation URL Description
Scale Denominator
Citation Title
Contact Role Type
Contact Type
Contact Name
Publish Date
Extent Type
Extent Start Date/Time
Extent End Date/Time
Citation URL
Citation URL Name
Citation URL Description
Scale Denominator

Process Steps

Process Step Number 1
» Description

The airborne raw files from the SHOALS sensor are downloaded into SHOALS-GCS software version 6.32. The system collects bathymetric LiDAR data at 2.5 kHz Pulse Repetition Rate for an approximated point density of 0.15 pts/m2 at 400 m altitude (AGL) and 100 kts (speed over ground). The SHOALS system also collects RGB imagery at 1 Hz using a Prosilica GX330 digital camera. 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). SHOALS-GCS auto-processing routine estimates the water surface and bottom surface points for each laser shot and applied the refraction correction automatically. Upon inspection and QA/QC in Fledermaus software version 7.7, anomalous data were flagged as invalid and bathymetry properly validated. All LiDAR points including bathymetric, topographic, water surface, noise and rejections were exported to LAS format. 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 the following classification: Emerged and topographic points (1), Noise and Rejections (7), Bathymetry (40), Derived water surface (42), and Submerged objects (wrecks, rocks, pilings) (43).
Process Date/Time  
Process Contact  
Phone (Voice)  
Email Address  
Source  
Process Step Number 2
» 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. 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), class 40 (bathymetric point), class 42 (derived water surface), and class 43 (submerged objects).
Process Date/Time 2018-04-01 00:00:00
Process Contact  
Phone (Voice)  
Email Address  
Source  
Process Step Number 3
» Description

The SHOALS 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 2 meter resolution digital elevation model (DEM).
Process Date/Time 2018-04-03 00:00:00
Process Contact Office for Coastal Management (OCM)
Phone (Voice)  
Email Address  
Source  
Process Step Number 4
» Description

The data were in UTM Zone 19 North coordinates and NAVD88 (Geoid12B) elevations in meters. The bare earth raster files were at a 2 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 2018-05-09 00:00:00
Process Contact Office for Coastal Management (OCM)
Phone (Voice)  
Email Address  
Source  
Process Step Number
» Description
Process Date/Time
Process Contact
Phone (Voice)
Email Address
Source
Process Step Number
» Description
Process Date/Time
Process Contact
Phone (Voice)
Email Address
Source
Process Step Number
» Description
Process Date/Time
Process Contact
Phone (Voice)
Email Address
Source

Acquisition Information

Instruments

Instrument Unavailable Reason  
Identifier
Docucomp UUID
Instrument / Gear
Instrument Type
Description
Identifier
Docucomp UUID
Instrument / Gear
Instrument Type
Description
Identifier
Docucomp UUID
Instrument / Gear
Instrument Type
Description

Platforms

Platform Unavailable Reason  
Identifier
Docucomp UUID
Description

Mounted Instruments
Identifier  
Identifier  
Identifier  
Identifier
Docucomp UUID
Description

Mounted Instruments
Identifier  
Identifier  
Identifier  
Identifier
Docucomp UUID
Description

Mounted Instruments
Identifier  
Identifier  
Identifier  

FAQs

Date
Author
Question
Answer

Child Items

Rubric scores updated every 15m

Score Type Title
     
     
     

Related Items

Item Type Relationship Type Title
     
     
     

Catalog Details

Catalog Item ID 52604
Metadata Record Created By Rebecca Mataosky
Metadata Record Created 2018-05-10 17:04+0000
Metadata Record Last Modified By Kirk Waters
» Metadata Record Last Modified 2024-07-24 10:47+0000
Metadata Record Published 2024-01-10
Owner Org OCM
Metadata Publication Status Published Externally
Do Not Publish? N
Metadata Workflow State Published / External
Metadata Last Review Date 2022-03-16
Metadata Review Frequency 1 Year
Metadata Next Review Date 2023-03-16
Tags