2015-2016 USGS/FEMA Lidar: Connecticut River Watershed, NH

OCM Partners
Data Set (DS) | ID: 71770 | Published / External
Created: 2024-01-02   |   Last Modified: 2024-01-02

Parent: Lidar - partner (no harvest)
Project (PRJ) | ID: 49401

ID: 71770
Data Set (DS)

* Discovery
• First Pass
» Metadata Rubric

Item Identification

* » Title 2015-2016 USGS/FEMA Lidar: Connecticut River Watershed, NH
Short Name 2015-2016 CT River NH m10025
* Status Completed
Creation Date  
Revision Date  
• Publication Date 2016
* » Abstract

Geographic Extent: Connecticut River Watershed (4,437 sq mi), Winnipesaukee River Watershed (796 sq mi), and portions of the White Mountain National Forest (WMNF) in New Hampshire (181 sq mi), covering approximately 5,233 total square miles.

Dataset Description: The Connecticut River Watershed 2015 project called for the planning, acquisition, processing and derivative products of LIDAR data to be collected at an aggregate nominal pulse spacing (NPS) of 0.7 meters the Connecticut and Winnipesaukee River Watershed areas of interest, and 0.58 meters NPS for the White Mountain National Forest project area. Project specifications are based on the U.S. Geological Survey National Geospatial Program Base Lidar Specification, Version 1.2 as well as the National Enhanced Elevation Assessment (NEEA) for QL2/QL2+ data for the WMNF area. The data was developed based on a horizontal projection/datum of NAD83 (2011) State Plane New Hampshire, US survey feet and vertical datum of NAVD88 (Geoid 12B), US survey feet. Lidar data for all three areas of interest was delivered in RAW LAS 1.4 flightline swath format, and processed to create Classified LAS 1.4 Files formatted to 6,464 individual 5,000-foot x 5,000-foot tiles.

After approval of the initial dataset was received from the USGS, the additional deliverables was produced for the White Mountain National Forest project area. This dataset includes tiled classified LAS data (first and last return) in LAS 1.4 and comma-delimited ASCII formats and 2.5-foot bare-earth raster DEMs in Esri grid format. Tiles names follow the naming schema implemented in previous WMNF task orders.

Data were subsequently reprocessed to Entwine Point Tile (EPT) format in web mercator projection with vertical meters. The EPT form of the data is used by the NOAA Digital Coast Data Access Viewer, which this metadata record is supporting. Additional processing steps may have been done by the Data Access Viewer and will be recorded in the lineage section.

Ground Conditions: LiDAR collection began in Fall 2015, while no snow was on the ground and rivers were at or below normal levels. In order to post process the LiDAR data to meet task order specifications, Quantum Spatial established 155 calibration control points in order to calibrate the LIDAR to known ground locations established throughout the project area. The accuracy of the data was checked with 135 NVA points and 117 VVA points (252 total QC checkpoints).
* Purpose

Classified LAS files are used to show the manually reviewed bare earth surface. This allows the user to create breaklines, raster DEMs, and intensity images.

The purpose of these lidar data was to produce high accuracy 3D hydro-flattened digital elevation models (DEM) and intensity images with a 2.5-foot cell size.

These raw lidar point cloud data were used to create classified lidar LAS files, 3D breaklines, hydro-flattened DEMs, and intensity images as necessary.
Notes
Other Citation Details
• Supplemental Information

USGS Contract: G10PC00026 Task Order Number: G15PD00886

CONTRACTOR: Quantum Spatial

Lidar data calibrated by Quantum Spatial, Inc. with data acquired by QSI, Woolpert, Inc., and PAR.

All follow-on processing was completed by the prime contractor.

The following are the USGS lidar fields in JSON:

{

"ldrinfo" : {

"ldrspec" : "USGS-NGP Base Specification v1.2",

"ldrsens" : "Leica ALS 70",

"ldrmaxnr" : "4",

"ldrnps" : "0.69",

"ldrdens" : "2.12",

"ldranps" : "0.69",

"ldradens" : "2.12",

"ldrfltht" : "2075",

"ldrfltsp" : "160",

"ldrscana" : "40.0",

"ldrscanr" : "40.7",

"ldrpulsr" : "264.0",

"ldrpulsd" : "4",

"ldrpulsw" : "0.47",

"ldrwavel" : "1064",

"ldrmpia" : "1",

"ldrbmdiv" : "0.22",

"ldrswatw" : "1510.48",

"ldrswato" : "13.11",

"ldrgeoid" : "g2012bu0.bin"

},

"ldrinfo_Concord" : {

"ldrspec" : "USGS-NGP Base Specification v1.2",

"ldrsens" : "Leica ALS 70",

"ldrmaxnr" : "4",

"ldrnps" : "0.69",

"ldrdens" : "2.12",

"ldranps" : "0.69",

"ldradens" : "2.12",

"ldrfltht" : "2075",

"ldrfltsp" : "160",

"ldrscana" : "40.0",

"ldrscanr" : "40.7",

"ldrpulsr" : "264.0",

"ldrpulsd" : "4",

"ldrpulsw" : "0.47",

"ldrwavel" : "1064",

"ldrmpia" : "1",

"ldrbmdiv" : "0.22",

"ldrswatw" : "1510.48",

"ldrswato" : "12.70",

"ldrgeoid" : "g2012bu0.bin"

},

"ldrinfo_Keene" : {

"ldrspec" : "USGS-NGP Base Specification v1.2",

"ldrsens" : "Leica ALS 70",

"ldrmaxnr" : "4",

"ldrnps" : "0.69",

"ldrdens" : "2.12",

"ldranps" : "0.69",

"ldradens" : "2.12",

"ldrfltht" : "2075",

"ldrfltsp" : "160",

"ldrscana" : "40.0",

"ldrscanr" : "40.7",

"ldrpulsr" : "264.0",

"ldrpulsd" : "4",

"ldrpulsw" : "0.47",

"ldrwavel" : "1064",

"ldrmpia" : "1",

"ldrbmdiv" : "0.22",

"ldrswatw" : "1510.48",

"ldrswato" : "13.23",

"ldrgeoid" : "g2012bu0.bin"

},

"ldrinfo_Lebanon" : {

"ldrspec" : "USGS-NGP Base Specification v1.2",

"ldrsens" : "Leica ALS 70",

"ldrmaxnr" : "4",

"ldrnps" : "0.69",

"ldrdens" : "2.12",

"ldranps" : "0.69",

"ldradens" : "2.12",

"ldrfltht" : "2075",

"ldrfltsp" : "160",

"ldrscana" : "40.0",

"ldrscanr" : "40.7",

"ldrpulsr" : "264.0",

"ldrpulsd" : "4",

"ldrpulsw" : "0.47",

"ldrwavel" : "1064",

"ldrmpia" : "1",

"ldrbmdiv" : "0.22",

"ldrswatw" : "1510.48",

"ldrswato" : "13.25",

"ldrgeoid" : "g2012bu0.bin"

},

"ldrinfo_Pittsburg" : {

"ldrspec" : "USGS-NGP Base Specification v1.2",

"ldrsens" : "Leica ALS 70",

"ldrmaxnr" : "4",

"ldrnps" : "0.69",

"ldrdens" : "2.12",

"ldranps" : "0.69",

"ldradens" : "2.12",

"ldrfltht" : "2075",

"ldrfltsp" : "160",

"ldrscana" : "40.0",

"ldrscanr" : "40.7",

"ldrpulsr" : "264.0",

"ldrpulsd" : "4",

"ldrpulsw" : "0.47",

"ldrwavel" : "1064",

"ldrmpia" : "1",

"ldrbmdiv" : "0.22",

"ldrswatw" : "1510.48",

"ldrswato" : "13.54",

"ldrgeoid" : "g2012bu0.bin"

},

"ldrinfo_StJohnsburyNorth" : {

"ldrspec" : "USGS-NGP Base Specification v1.2",

"ldrsens" : "Leica ALS 70",

"ldrmaxnr" : "4",

"ldrnps" : "0.69",

"ldrdens" : "2.12",

"ldranps" : "0.69",

"ldradens" : "2.12",

"ldrfltht" : "2075",

"ldrfltsp" : "160",

"ldrscana" : "40.0",

"ldrscanr" : "40.7",

"ldrpulsr" : "264.0",

"ldrpulsd" : "4",

"ldrpulsw" : "0.47",

"ldrwavel" : "1064",

"ldrmpia" : "1",

"ldrbmdiv" : "0.22",

"ldrswatw" : "1510.48",

"ldrswato" : "12.68",

"ldrgeoid" : "g2012bu0.bin"

},

"ldrinfo_StJohnsburySouth" : {

"ldrspec" : "USGS-NGP Base Specification v1.2",

"ldrsens" : "Leica ALS 70",

"ldrmaxnr" : "4",

"ldrnps" : "0.69",

"ldrdens" : "2.12",

"ldranps" : "0.69",

"ldradens" : "2.12",

"ldrfltht" : "2075",

"ldrfltsp" : "160",

"ldrscana" : "40.0",

"ldrscanr" : "40.7",

"ldrpulsr" : "264.0",

"ldrpulsd" : "4",

"ldrpulsw" : "0.47",

"ldrwavel" : "1064",

"ldrmpia" : "1",

"ldrbmdiv" : "0.22",

"ldrswatw" : "1510.48",

"ldrswato" : "12.17",

"ldrgeoid" : "g2012bu0.bin"

},

"ldrinfo_Winnepesaukee" : {

"ldrspec" : "USGS-NGP Base Specification v1.2",

"ldrsens" : "Leica ALS 70",

"ldrmaxnr" : "4",

"ldrnps" : "0.69",

"ldrdens" : "2.12",

"ldranps" : "0.69",

"ldradens" : "2.12",

"ldrfltht" : "2075",

"ldrfltsp" : "160",

"ldrscana" : "40.0",

"ldrscanr" : "40.7",

"ldrpulsr" : "264.0",

"ldrpulsd" : "4",

"ldrpulsw" : "0.47",

"ldrwavel" : "1064",

"ldrmpia" : "1",

"ldrbmdiv" : "0.22",

"ldrswatw" : "1510.48",

"ldrswato" : "12.82",

"ldrgeoid" : "g2012bu0.bin"

},

"ldrinfo_WMNF" : {

"ldrspec" : "USGS-NGP Base Specification v1.2",

"ldrsens" : "Leica ALS 70",

"ldrmaxnr" : "4",

"ldrnps" : "0.56",

"ldrdens" : "3.21",

"ldranps" : "0.56",

"ldradens" : "3.21",

"ldrfltht" : "160",

"ldrfltsp" : "160",

"ldrscana" : "28.0",

"ldrscanr" : "49.6",

"ldrpulsr" : "273.0",

"ldrpulsd" : "4",

"ldrpulsw" : "0.047",

"ldrwavel" : "1064",

"ldrmpia" : "1",

"ldrbmdiv" : "0.22",

"ldrswatw" : "1034.71",

"ldrswato" : "19.98",

"ldrgeoid" : "g2012bu0.bin"

},

"ldraccur" : {

"ldrchacc" : "0.196",

"rawnva" : "0.093",

"rawnvan" : "133",

"clsnva" : "0.092",

"clsnvan" : "134",

"clsvva" : "0.284",

"clsvvan" : "116"

},

"lasinfo" : {

"lasver" : "1.4",

"lasprf" : "6",

"laswheld" : "Withheld (ignore) points were identified in these files using the standard LAS Withheld bit",

"lasolap" : "Swath "overage" points were identified in these files using the standard LAS overlap bit",

"lasintr" : "16",

"lasclass" : {

"clascode" : "1",

"clasitem" : "Processed, but unclassified"

},

"lasclass" : {

"clascode" : "2",

"clasitem" : "Bare-earth ground"

},

"lasclass" : {

"clascode" : "7",

"clasitem" : "Low noise"

},

"lasclass" : {

"clascode" : "9",

"clasitem" : "Water"

},

"lasclass" : {

"clascode" : "10",

"clasitem" : "Ignored Ground"

},

"lasclass" : {

"clascode" : "17",

"clasitem" : "Bridge Decks"

},

"lasclass" : {

"clascode" : "18",

"clasitem" : "High noise"

}

}}
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 > COASTAL PROCESSES > COASTAL ELEVATION
ISO 19115 Topic Category elevation
   
   
   

Temporal Keywords

Thesaurus Keyword
   
   
   

* Spatial Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Location Keywords CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA
Global Change Master Directory (GCMD) Location Keywords CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > NEW HAMPSHIRE
Global Change Master Directory (GCMD) Location Keywords VERTICAL LOCATION > LAND SURFACE
   
   
   

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
   
   
   

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 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 Office for Coastal Management or its partners
Data Set Credit USGS; FEMA; Quantum Spatial

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 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
* » 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 Point of Contact
* » 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
* » 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 -72.57793839123
* » E° Bound -70.9282606398
* » N° Bound 45.3113522389
* » S° Bound 42.70426337249
* » Description

Extent Group 1 / Vertical Extent

EPSG Code
Vertical Minimum
Vertical Maximum

Extent Group 1 / Time Frame 1

* » Time Frame Type Range
* » Start 2015-10-24
End 2016-04-29
Alternate Start As Of Info  
Alternate End As Of Info  
Description

Spatial Information

Spatial Resolution

Angular Distance  
Angular Distance Units  
Horizontal Distance 0.6
Horizontal Distance Units Meter
Vertical Distance  
Vertical Distance Units  
Equivalent Scale Denominator  
Level of Detail Description

Spatial Representation

Grid Representation Used? No
Vector Representation Used? Yes
Text / Table Representation Used? No
TIN Representation Used? No
Stereo Model Representation Used? No
Video Representation Used? No

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? Yes
Point Object Count 97194025751
Solid Object Present?  
Solid Object Count  
Surface Object Present?  
Surface Object Count  

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 EPSG:3857

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  

Reference System

EPSG Code EPSG:5703

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  

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 bulk or 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.
Metadata Access Constraints
Metadata Use Constraints

Distribution Information

Start Date 2024-01-02
End Date Present
» Download URL https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=10025/details/10025
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. A new metadata will be produced to reflect your request using this record as a base. Change to an orthometric vertical datum is one of the many options.
File Date/Time  
File Type (Deprecated)  
Distribution Format Not Applicable
File Size  
Application Version  
Compression Zip
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
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

MicroStation Version 8; TerraScan Version 15; TerraModeler Version 15; GeoCue Version 2014.1.21.4; ESRI ArcGIS 10.3; Global Mapper 16; Leica Cloud Pro 1.2; Windows 7 Operating System

\\PSIHQ_NX3200\Projects\Projects\26818_CT_River_Watershed_Winnipesaukee 597 GB and \\matrix\matrix\LIDAR\26818_CT_River 11.9 TB

Data Quality

Representativeness
Accuracy
Analytical Accuracy
Horizontal Positional Accuracy
Vertical Positional Accuracy

Quantitative values: 0.093 m, 0.092 m, and 0.284 m.

Tests that produced these values:

The raw NVA was tested using 133 independent survey points located in open terrain. The surveyed checkpoints were distributed throughout the project area and surveyed using GNSS procedures and methodologies that provide reliable and consistent results to meet the project's accuracy requirements. Please see the "Survey Accuracy Requirements" and "Field Methodology" sections in the Survey Report for more information. Elevations from the unclassified lidar surface were measured for the x,y location of each check point. Elevations interpolated from the unclassified lidar surface were then compared to the elevation values of the surveyed control. The RMSEz was computed to be 0.047 meters and AccuracyZ to be 0.093 meters. This meets the required AccuracyZ value of 0.196 meters raw NVA at 95 percent confidence level using (RMSEz * 1.9600) as defined by the National Standards for Spatial Data Accuracy (NSSDA); assessed and reported using National Digital Elevation Program (NDEP)/ASPRS Guidelines.

The NVA was tested using 134 independent survey points located in open terrain. The surveyed checkpoints were distributed throughout the project area and surveyed using GNSS procedures and methodologies that provide reliable and consistent results to meet the project's accuracy requirements. Please see the "Survey Accuracy Requirements" and "Field Methodology" sections in the Survey Report for more information. Elevations from the DEM surface were measured for the x,y location of each check point. Elevations interpolated from the DEM surface were then compared to the elevation values of the surveyed control. The RMSEz was computed to be 0.047 meters and AccuracyZ to be 0.092 meters. This meets the required AccuracyZ value of 0.196 meters NVA at 95 percent confidence level using (RMSEz * 1.9600) as defined by the National Standards for Spatial Data Accuracy (NSSDA); assessed and reported using National Digital Elevation Program (NDEP)/ASPRS Guidelines.

The VVA was tested using 116 independent survey points located in vegetated terrain. The surveyed checkpoints were distributed throughout the project area and surveyed using GNSS procedures and methodologies that provide reliable and consistent results to meet the project's accuracy requirements. Please see the "Survey Accuracy Requirements" and "Field Methodology" sections in the Survey Report for more information. Elevations from the DEM surface were measured for the x,y location of each check point. Elevations interpolated from the DEM surface were then compared to the elevation values of the surveyed control. The VVA was computed to be 0.284 meters. This meets the required value of 0.294 meters VVA at 95th percentile level using the 95th percentile of the absolute value of all vertical errors in all combined vegetation classes as defined by the National Standards for Spatial Data Accuracy (NSSDA); assessed and reported using National Digital Elevation Program (NDEP)/ASPRS Guidelines.
Quantitation Limits
Bias
Comparability
Completeness Measure
Precision
Analytical Precision
Field Precision
Sensitivity
Detection Limit
Completeness Report

These raw LAS data files include all data points collected.

No points have been removed or excluded.

A visual qualitative assessment was performed to ensure data completeness.

No void areas or missing data exist. The raw point cloud is of good quality and data passes Nonvegetated Vertical Accuracy specifications.
Conceptual Consistency

Data cover the entire area specified for this project.
» 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-NC
» 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 cloud storage.

Lineage

» Lineage Statement

Sources

Citation Title Entwine Point Tiles
Contact Role Type Publisher
Contact Type Organization
Contact Name USGS
Publish Date  
Extent Type  
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Citation URL https://s3-us-west-2.amazonaws.com/usgs-lidar-public/USGS_LPC_CT_River_Lot6_Winnipesaulee_2015_LAS_2017/ept.json
Citation URL Name Entwine Point Tiles
Citation URL Description

Entwine Point Tiles for Connecticut River Watershed 2015-2016 lidar data, New Hampshire.
Source Contribution

Data referenced by the Digital Coast Data Access Viewer.
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Process Steps

Process Step Number 1
» Description

Lidar Pre-Processing:

Airborne GPS and IMU data were merged to develop a Single Best Estimate (SBET) of the lidar system trajectory for each lift. Lidar ranging data were initially calibrated using previous best parameters for this instrument and aircraft. Relative calibration was evaluated using advanced plane-matching analysis and parameter corrections derived. This was repeated iteratively until residual errors between overlapping swaths, across all project lifts, was reduced to acceptable levels. Data were then block adjusted to match surveyed calibration control. Raw data NVA were checked using independently surveyed checkpoints. Swath overage points were identified and tagged within each swath file. The results of the final calibration, NVA and horizontal accuracy assessments, and the "raw" swaths were forwarded to the client to obtain a Notice To Proceed on classification and derivative product generation.
Process Date/Time 2016-01-01 00:00:00
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Process Step Number 2
» Description

Lidar Post-Processing:

The calibrated and controlled lidar swaths were processed using automatic point classification routines in proprietary software. These routines operate against the entire collection (all swaths, all lifts), eliminating character differences between files. Data were then distributed as virtual tiles to experienced lidar analysts for localized automatic classification, manual editing, and peer-based QC checks. Supervisory QC monitoring of work in progress and completed editing ensured consistency of classification character and adherence to project requirements across the entire project area.

All classification tags are stored in the original swath files.

After completion of classification and final QC approval, the NVA and VVA for the project are calculated. Sample areas for each land cover type present in the project area were extracted and forwarded to the client, along with the results of the accuracy tests. Upon acceptance, the complete classified lidar swath files were delivered to the client.
Process Date/Time 2016-01-01 00:00:00
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» Description

Classified LAS Processing:

The bare earth surface is then manually reviewed to ensure correct classification on the Class 2 (Ground) points. After the bare-earth surface is finalized, it is then used to generate all hydro-breaklines through heads-up digitization.

All ground (ASPRS Class 2) LiDAR data inside of the Lake Pond and Double Line Drain hydro flattening breaklines were then classified to water (ASPRS Class 9) using TerraScan macro functionality. A buffer of 1 meter was also used around each hydro-flattened feature to classify these ground (ASPRS Class 2) points to Ignored ground (ASPRS Class 10). All Lake Pond Island and Double Line Drain Island features were checked to ensure that the ground (ASPRS Class 2) points were reclassified to the correct classification after the automated classification was completed. All bridge decks were classified to Class 17.

All overlap data was processed through automated functionality provided by TerraScan to classify the overlapping flight line data to approved classes by USGS. The overlap data was identified using the Overlap Flag, per LAS 1.4 specifications.

All data was manually reviewed and any remaining artifacts removed using functionality provided by TerraScan and TerraModeler. Global Mapper us used as a final check of the bare earth dataset. GeoCue was then used to create the deliverable industry-standard LAS files for both the All Point Cloud Data and the Bare Earth. Quantum Spatial proprietary software was used to perform final statistical analysis of the classes in the LAS files, on a per tile level to verify final classification metrics and full LAS header information.
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Data were converted to Entwine Point Tiles (EPT) in Web Mercator projection and units of meters by USGS. NOAA is leveraging the EPT files for use in the Digital Coast Data Access Viewer and created this metadata to support that usage.

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Process Contact NOAA Office for Coastal Management (NOAA/OCM)
Phone (Voice) (843) 740-1202
Email Address coastal.info@noaa.gov
Source Entwine Point Tiles
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Acquisition Information

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Catalog Details

Catalog Item ID 71770
Metadata Record Created By Kirk Waters
Metadata Record Created 2024-01-02 12:45+0000
Metadata Record Last Modified By Kirk Waters
» Metadata Record Last Modified 2024-01-02 13:05+0000
Metadata Record Published 2024-01-02
Owner Org OCMP
Metadata Publication Status Published Externally
Do Not Publish? N
Metadata Workflow State Published / External
Metadata Last Review Date 2024-01-02
Metadata Review Frequency 3 Years
Metadata Next Review Date 2027-01-02
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