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Summary

Short Citation
OCM Partners, 2024: 2021 USGS Lidar: South Central Illinois, https://www.fisheries.noaa.gov/inport/item/72389.
Full Citation Examples

Abstract

Product: These lidar data are processed Classified LAS 1.4 files, formatted to individual 2000 US survey feet x 2000 US survey feet tiles; used to create intensity images, 3D breaklines and hydro-flattened DEMs as necessary.

Geographic Extent: This project covers 17 counties in south central Illinois.

IL_SouthCentral_1 (Work Unit 216607) covering approximately 6109 square miles in the following counties: Clay, Effingham, Fayette, Jefferson, Macon, Marion, Moultrie, Richland, Shelby, Vermillion

IL_SouthCentral_2 (Work Unit 226708) covering approximately 3260 square miles in the following counties: Bond, Calhoun, Clinton, Jackson, Jersey, Perry, Washington

Dataset Description of the Original Data: USGS_IL_SouthCentral Illinois 2021 Lidar project called for the planning, acquisition, processing and derivative products of lidar data to be collected at a nominal pulse spacing (NPS) of 0.5 meters. Project specifications are based on the U.S. Geological Survey National Geospatial Program Base Lidar Specification, Version 2020 rev A. The data was developed based on a horizontal projection/datum of NAD83(2011), State Plane Illinois East and West, US survey feet, and a vertical datum of NAVD88 (GEOID18), US survey feet. Lidar data was delivered as processed Classified LAS 1.4 files, formatted to individual 2000 US survey feet x 2000 US survey feet tiles, tiled Intensity Imagery, and tiled bare earth DEMs; all tiled to the same 2000 US survey feet x 2000 US survey feet schema. Lidar point cloud LAS files are created for each tile in the tiling schema in which there is reflected photonic energy. No LAS files are created for tiles in which there is total absorption of photons, such as tiles consisting of all water and in which photonic energy is absorbed. Intensity Images are created for each tile in the tiling schema in which there is reflected photonic energy. No intensity tiles are created for tiles in which there is total absorption of photons, such as tiles consisting of all water and in which photonic energy is absorbed.

Ground Conditions: Lidar was collected in spring 2021, 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 and meet ASPRS vertical accuracy guidelines, Subcontractor, Prairie Engineers established ground control points that were used to calibrate the lidar to known ground locations established throughout the USGS_IL_SouthCentral Illinois project area. Additional independent accuracy checkpoints, in Bare Earth and Urban landcovers, tall Grass/tall weeds/crops, Brush lands/short trees, Forested categories were used to assess the vertical accuracy of the data. These checkpoints were not used to calibrate or post process the data.

This metadata record supports the data entry in the NOAA Digital Coast Data Access Viewer (DAV). For this data set, the DAV is leveraging the Entwine Point Tiles (EPT) hosted by USGS on Amazon Web Services.

Distribution Information

  • Not Applicable

    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.

  • LAS/LAZ - LASer

    Bulk download of data files in LAZ format, a horizontal projection/datum of NAD83 (2011), State Plane Illinois East and West Zones, US survey feet and vertical datum of NAVD88 (GEOID18), US survey feet.

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

elevation, 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

-89.28735083° W, -87.51805913° E, 40.5° N, 38.13° S

IL_SouthCentral_1 (Work Unit 216607) covering approximately 6109 square miles in the following counties: Clay, Effingham, Fayette, Jefferson, Macon, Marion, Moultrie, Richland, Shelby, Vermillion

Time Frame 1
2021-03-06 - 2021-04-05

Dates of collection for IL_SouthCentral_1

Item Identification

Title: 2021 USGS Lidar: South Central Illinois
Short Name: il2021_south_central_m10106_metadata
Status: Completed
Creation Date: 2021
Publication Date: 2022-05-18
Abstract:

Product: These lidar data are processed Classified LAS 1.4 files, formatted to individual 2000 US survey feet x 2000 US survey feet tiles; used to create intensity images, 3D breaklines and hydro-flattened DEMs as necessary.

Geographic Extent: This project covers 17 counties in south central Illinois.

IL_SouthCentral_1 (Work Unit 216607) covering approximately 6109 square miles in the following counties: Clay, Effingham, Fayette, Jefferson, Macon, Marion, Moultrie, Richland, Shelby, Vermillion

IL_SouthCentral_2 (Work Unit 226708) covering approximately 3260 square miles in the following counties: Bond, Calhoun, Clinton, Jackson, Jersey, Perry, Washington

Dataset Description of the Original Data: USGS_IL_SouthCentral Illinois 2021 Lidar project called for the planning, acquisition, processing and derivative products of lidar data to be collected at a nominal pulse spacing (NPS) of 0.5 meters. Project specifications are based on the U.S. Geological Survey National Geospatial Program Base Lidar Specification, Version 2020 rev A. The data was developed based on a horizontal projection/datum of NAD83(2011), State Plane Illinois East and West, US survey feet, and a vertical datum of NAVD88 (GEOID18), US survey feet. Lidar data was delivered as processed Classified LAS 1.4 files, formatted to individual 2000 US survey feet x 2000 US survey feet tiles, tiled Intensity Imagery, and tiled bare earth DEMs; all tiled to the same 2000 US survey feet x 2000 US survey feet schema. Lidar point cloud LAS files are created for each tile in the tiling schema in which there is reflected photonic energy. No LAS files are created for tiles in which there is total absorption of photons, such as tiles consisting of all water and in which photonic energy is absorbed. Intensity Images are created for each tile in the tiling schema in which there is reflected photonic energy. No intensity tiles are created for tiles in which there is total absorption of photons, such as tiles consisting of all water and in which photonic energy is absorbed.

Ground Conditions: Lidar was collected in spring 2021, 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 and meet ASPRS vertical accuracy guidelines, Subcontractor, Prairie Engineers established ground control points that were used to calibrate the lidar to known ground locations established throughout the USGS_IL_SouthCentral Illinois project area. Additional independent accuracy checkpoints, in Bare Earth and Urban landcovers, tall Grass/tall weeds/crops, Brush lands/short trees, Forested categories were used to assess the vertical accuracy of the data. These checkpoints were not used to calibrate or post process the data.

This metadata record supports the data entry in the NOAA Digital Coast Data Access Viewer (DAV). For this data set, the DAV is leveraging the Entwine Point Tiles (EPT) hosted by USGS on Amazon Web Services.

Purpose:

To acquire QL2+ lidar detailing surface elevation data, and vegetation to support the Federal Emergency Management (FEMA) Risk Mapping, Assessment, and Planning (MAP) program, the National Resources Conservation Service (NRCS) high resolution elevation enterprise program, the Illinois State Geological Survey's Height Modernization Program, Land Stewardship (IDALS) Illinois Flood Plain program, and the 3DEP mission. Classified LAS files are used to show the manually reviewed bare earth surface. This allows the user to create Intensity Images, Breaklines and Raster DEMs. The purpose of this lidar data was to produce high accuracy 3D hydro-flattened Digital Elevation Model (DEM) with a 2 US survey feet cell size. These lidar point cloud data were used to create intensity images, 3D breaklines, and hydro-flattened DEMs as necessary.

Supplemental Information:

USGS Contract No. 140G0221F0069 CONTRACTOR: Aerial Services, Inc. (ASI) served as the prime contractor for this project. In addition to project management, ASI was responsible for LiDAR acquisition and calibration for a 934 square mile area of the farthest northeast section of this USGS_IL_SouthCentral_1_2021 project. ASI was responsible for producing LiDAR products; Digital Elevation Model (DEM), Intensity Imagery, and quality assurance for the entire IL South Central project. Subcontractor: Aerial Surveys International, LLC was responsible for LiDAR acquisition and calibration for a 4,429 square mile area of the central portion of the USGS_IL_SouthCentral_1_2021 project. Subcontractor: SurvTech Solutions was responsible for LiDAR acquisition and calibration of 579 square miles of the southern section of the USGS_IL_SouthCentral_1_2021 project area. SurvTech Solutions manually performed bare earth cleanup and collected hydro for the far northeastern portion of this project area that was acquired by ASI. Subcontractor: Ayres Associates manually performed bare earth cleanup, and collected hydro on the remaining 5007 square mile area of the USGS_IL_SouthCentral_1_2021 project area. All follow-up processing was completed by the prime contractor.

The following are the USGS lidar fields in JSON:

{

"ldrinfo" : {

"ldrspec" : "U.S. Geological Survey (USGS) - National Geospatial Program (NGP) Lidar Base Specification v2020, Revision A",

"ldrsens" : "Reigl LMS-Q1560",

"ldrmaxnr" : "4",

"ldrnps" : "0.5",

"ldrdens" : "4",

"ldranps" : "0.5",

"ldradens" : "4",

"ldrfltht" : "1278",

"ldrfltsp" : "150",

"ldrscana" : "58.52",

"ldrscanr" : "107",

"ldrpulsr" : "400",

"ldrpulsd" : "2.5",

"ldrpulsw" : "0.75",

"ldrwavel" : "1064",

"ldrmpia" : "1",

"ldrbmdiv" : "0.25",

"ldrswatw" : "1432",

"ldrswato" : "20",

"ldrgeoid" : "National Geodetic Survey (NGS) Geoid18"

},

"ldrinfo" : {

"ldrspec" : "U.S. Geological Survey (USGS) - National Geospatial Program (NGP) Lidar Base Specification v2020, Revision A",

"ldrsens" : "Optech Galaxy T2000",

"ldrmaxnr" : "8",

"ldrnps" : "0.5",

"ldrdens" : "4",

"ldranps" : "0.5",

"ldradens" : "4",

"ldrfltht" : "2134",

"ldrfltsp" : "160",

"ldrscana" : "32",

"ldrscanr" : "92",

"ldrpulsr" : "800",

"ldrpulsd" : "1.25",

"ldrpulsw" : "0.37",

"ldrwavel" : "1064",

"ldrmpia" : "1",

"ldrbmdiv" : "0.16",

"ldrswatw" : "1553",

"ldrswato" : "30",

"ldrgeoid" : "National Geodetic Survey (NGS) Geoid18"

},

"ldrinfo" : {

"ldrspec" : "U.S. Geological Survey (USGS) - National Geospatial Program (NGP) Lidar Base Specification v2020, Revision A",

"ldrsens" : "Optech T2000",

"ldrmaxnr" : "8",

"ldrnps" : "0.5",

"ldrdens" : "4",

"ldranps" : "0.5",

"ldradens" : "4",

"ldrfltht" : "2500",

"ldrfltsp" : "160",

"ldrscana" : "32",

"ldrscanr" : "92",

"ldrpulsr" : "800",

"ldrpulsd" : "1.25",

"ldrpulsw" : "0.24",

"ldrwavel" : "1064",

"ldrmpia" : "1",

"ldrbmdiv" : "0.16",

"ldrswatw" : "1434",

"ldrswato" : "30",

"ldrgeoid" : "National Geodetic Survey (NGS) Geoid18"

},

"ldraccur" : {

"ldrchacc" : "0",

"rawnva" : "0",

"rawnvan" : "0"

},

"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" : "3",

"clasitem" : "Low Vegetation"

},

"lasclass" : {

"clascode" : "4",

"clasitem" : "Medium Vegetation"

},

"lasclass" : {

"clascode" : "5",

"clasitem" : "High Vegetation"

},

"lasclass" : {

"clascode" : "7",

"clasitem" : "Low Noise"

},

"lasclass" : {

"clascode" : "9",

"clasitem" : "Water"

},

"lasclass" : {

"clascode" : "17",

"clasitem" : "Bridge Decks"

},

"lasclass" : {

"clascode" : "18",

"clasitem" : "High Noise"

},

"lasclass" : {

"clascode" : "20",

"clasitem" : "Ignored Ground"

}

}}

Keywords

Theme Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION
ISO 19115 Topic Category
elevation

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 > ILLINOIS
Global Change Master Directory (GCMD) Location Keywords
VERTICAL LOCATION > LAND SURFACE

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 Office for Coastal Management or its partners.

Data Set Credit: Aerial Services, Inc., USGS

Support Roles

Data Steward

CC ID: 1330527
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: 1330526
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: 1330554
Date Effective From: 2022
Date Effective To:
Contact (Organization): U.S. Geological Survey
Address: 12201 Sunrise Valley Drive
Reston, VA 20191
USA
URL: USGS Home

Metadata Contact

CC ID: 1330528
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

Point of Contact

CC ID: 1330529
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

Extents

Currentness Reference: Ground Condition

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 1330532
W° Bound: -89.28735083
E° Bound: -87.51805913
N° Bound: 40.5
S° Bound: 38.13
Description

IL_SouthCentral_1 (Work Unit 216607) covering approximately 6109 square miles in the following counties: Clay, Effingham, Fayette, Jefferson, Macon, Marion, Moultrie, Richland, Shelby, Vermillion

Extent Group 1 / Time Frame 1

CC ID: 1330531
Time Frame Type: Range
Start: 2021-03-06
End: 2021-04-05
Description:

Dates of collection for IL_SouthCentral_1

Extent Group 2

Extent Group 2 / Geographic Area 1

CC ID: 1330556
W° Bound: -90.97
E° Bound: -89.09
N° Bound: 39.42
S° Bound: 37.6
Description

IL_SouthCentral_2 (Work Unit 226708) covering approximately 3260 square miles in the following counties: Bond, Calhoun, Clinton, Jackson, Jersey, Perry, Washington

Extent Group 2 / Time Frame 1

CC ID: 1330557
Time Frame Type: Range
Start: 2021-03-06
End: 2021-04-12
Description:

Dates of collection for IL_SouthCentral_2

Spatial Information

Spatial Representation

Representations Used

Grid: No
Vector: Yes
Text / Table: No
TIN: No
Stereo Model: No
Video: No

Reference Systems

Reference System 1

CC ID: 1330558

Coordinate Reference System

CRS Type: Projected
EPSG Code: EPSG:3857
EPSG Name: WGS 84 / Pseudo-Mercator
See Full Coordinate Reference System Information

Reference System 2

CC ID: 1330559

Coordinate Reference System

CRS Type: Vertical
EPSG Code: EPSG:6360
EPSG Name: NAVD88 height (ftUS)
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: 1330533
Start Date: 2024-04-05
End Date: Present
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=10106/details/10106
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.

Distribution Format: Not Applicable
Compression: Zip

Distribution 2

CC ID: 1330534
Start Date: 2022
End Date: Present
Download URL: https://rockyweb.usgs.gov/vdelivery/Datasets/Staged/Elevation/LPC/Projects/IL_SouthCentral_2021_D21/
Distributor: U.S. Geological Survey (2022 - Present)
File Name: Bulk Download
Description:

Bulk download of data files in LAZ format, a horizontal projection/datum of NAD83 (2011), State Plane Illinois East and West Zones, US survey feet and vertical datum of NAVD88 (GEOID18), US survey feet.

Distribution Format: LAS/LAZ - LASer
Compression: LAZ

URLs

URL 1

CC ID: 1330524
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 2

CC ID: 1330560
URL: https://s3-us-west-2.amazonaws.com/usgs-lidar-public/IL_SouthCentral_1_2021/ept.json
Name: USGS Entwine Point Tile (EPT) - IL_SouthCentral_1
URL Type:
Online Resource
File Resource Format: json
Description:

Entwine Point Tile (EPT) is a simple and flexible octree-based storage format for point cloud data. The data is organized in such a way that the data can be reasonably streamed over the internet, pulling only the points you need. EPT files can be queried to return a subset of the points that give you a representation of the area. As you zoom further in, you are requesting higher and higher densities. A dataset in EPT will contain a lot of files, however, the ept.json file describes all the rest. The EPT file can be used in Potree and QGIS to view the point cloud.

URL 3

CC ID: 1330561
URL: https://s3-us-west-2.amazonaws.com/usgs-lidar-public/IL_SouthCentral_2_2021/ept.json
Name: USGS Entwine Point Tile (EPT) - IL_SouthCentral_2
URL Type:
Online Resource
File Resource Format: json
Description:

Entwine Point Tile (EPT) is a simple and flexible octree-based storage format for point cloud data. The data is organized in such a way that the data can be reasonably streamed over the internet, pulling only the points you need. EPT files can be queried to return a subset of the points that give you a representation of the area. As you zoom further in, you are requesting higher and higher densities. A dataset in EPT will contain a lot of files, however, the ept.json file describes all the rest. The EPT file can be used in Potree and QGIS to view the point cloud.

URL 4

CC ID: 1330562
URL: https://usgs.entwine.io/data/view.html?r=[%22https://s3-us-west-2.amazonaws.com/usgs-lidar-public/IL_SouthCentral_1_2021/ept.json%22,%22https://s3-us-west-2.amazonaws.com/usgs-lidar-public/IL_SouthCentral_2_2021/ept.json%22]
Name: USGS 3D View
URL Type:
Online Resource
Description:

Link to view the point cloud, using the Entwine Point Tile (EPT) format, in the 3D Potree viewer.

URL 5

CC ID: 1330563
URL: https://prd-tnm.s3.amazonaws.com/StagedProducts/Elevation/metadata/IL_SouthCentral_2021_D21/IL_SouthCentral_1_2021/reports/IL_SouthCentral_1_2021_Final_Report.pdf
Name: Lidar Report - IL_SouthCentral_1
URL Type:
Online Resource
File Resource Format: pdf
Description:

Link to the lidar report.

URL 6

CC ID: 1330564
URL: https://prd-tnm.s3.amazonaws.com/StagedProducts/Elevation/metadata/IL_SouthCentral_2021_D21/IL_SouthCentral_2_2021/reports/IL_SouthCentral_2_2021_Final_Report.pdf
Name: Lidar Report - IL_SouthCentral_2
URL Type:
Online Resource
File Resource Format: pdf
Description:

Link to the lidar report.

URL 7

CC ID: 1330565
URL: https://prd-tnm.s3.amazonaws.com/StagedProducts/Elevation/metadata/IL_SouthCentral_2021_D21/USGS_IL_SouthCentral_2021_D21_ProjectReport.pdf
Name: USGS Project Report
URL Type:
Online Resource
File Resource Format: pdf
Description:

Link to the USGS Project Report that provides information about the project, vertical accuracy results, and the point classes and sensors used.

URL 8

CC ID: 1330566
URL: https://prd-tnm.s3.amazonaws.com/index.html?prefix=StagedProducts/Elevation/metadata/IL_SouthCentral_2021_D21/
Name: USGS Additional Info
URL Type:
Online Resource
File Resource Format: pdf
Description:

Link to the reports, breaklines, metadata, and spatial metadata.

Technical Environment

Description:

Track’Air; Topoflight ; Optech’s FMS; Trimble CenterPoint® RTX™, POSPac PP-RTX, GNSS, Applanix’s POSPAC MMS version 8.4.7284.36831, Optech’s LMS ; MARS 8; RIPROCESS; BayesMap-StripAlign; MicroSatation Connect Update 16 - version 10.16.00.80; TerraSolid TerraMatch version020.003,TerraModel version 021.004, TerraScan version 021.005; Windows 10 Operating \\server\directory path\*.las 3.63TB

Data Quality

Horizontal Positional Accuracy:

IL_SouthCentral_1:

The Optech Galaxy Prime data set was produced to meet ASPRS Positional Accuracy Standards for Digital Geospatial Data (2014) for a 28.75 (cm) RMSEx / RMSEy Horizontal Accuracy Class which equates to Positional Horizontal Accuracy = +/- 56.35 cm at a 95% confidence level.

IL_SouthCentral_2:

The Optech Galaxy Prime data set was produced to meet ASPRS Positional Accuracy Standards for Digital Geospatial Data (2014) for a 32.72 (cm) RMSEx / RMSEy Horizontal Accuracy Class which equates to Positional Horizontal Accuracy = +/- 64.13 cm at a 95% confidence level.

Vertical Positional Accuracy:

USGS Determined Vertical Accuracy:

Tested NVA RMSEz = 4.3 cm

Tested 95th percentile value for VVA is : 16.57 cm

For more information see the USGS project report and the lidar report. The links to these reports are provided in the URL section of this metadata record.

Completeness Report:

These 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 Non-Vegetated Vertical Accuracy specifications.

Conceptual Consistency:

Data covers the entire area specified for this project.

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-NC
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:

The NOAA Office for Coastal Management (OCM) ingested references to the USGS Entwine Point Tiles (EPT) hosted on Amazon Web Services (AWS) into the Digital Coast Data Access Viewer (DAV). The DAV accesses the point cloud as it resides on AWS under the usgs-lidar-public-container.

Sources

USGS AWS Entwine Point Tile (EPT) - IL_SouthCentral_1

CC ID: 1330567
Contact Role Type: Publisher
Contact Type: Organization
Contact Name: USGS
Citation URL: https://s3-us-west-2.amazonaws.com/usgs-lidar-public/IL_SouthCentral_1_2021/ept.json
Citation URL Name: Entwine Point Tile (EPT) for IL_SouthCentral_1

USGS AWS Entwine Point Tile (EPT) - IL_SouthCentral_2

CC ID: 1330568
Contact Role Type: Publisher
Contact Type: Organization
Contact Name: USGS
Citation URL: https://s3-us-west-2.amazonaws.com/usgs-lidar-public/IL_SouthCentral_2_2021/ept.json
Citation URL Name: Entwine Point Tile (EPT) for IL_SouthCentral_2

Process Steps

Process Step 1

CC ID: 1330517
Description:

The boresight for each lift was done individually as the solution may change slightly from lift to lift. The following steps describe the Raw Data Processing and Boresight process: 1) Technicians processed the raw data to LAS format flight lines using the final GPS/IMU solution. This LAS data set was used as source data for boresight. 2) Technicians first used Aerial Services Inc. proprietary and commercial software to calculate initial boresight adjustment angles based on sample areas selected in the lift. These areas cover calibration flight lines collected in the lift, cross tie and production flight lines. These areas are well distributed in the lift coverage and cover multiple terrain types that are necessary for boresight angle calculation. The technician then analyzed the results and made any necessary additional adjustment until it is acceptable for the selected areas. 3) Once the boresight angle calculation was completed for the selected areas, the adjusted settings were applied to all of the flight lines of the lift and checked for consistency. The technicians utilized commercial and proprietary software packages to analyze how well flight line overlaps match for the entire lift and adjusted as necessary until the results met the project specifications. 4) Once all lifts were completed with individual boresight adjustment, the technicians checked and corrected the vertical misalignment of all flight lines and also the matching between data and ground truth. The relative accuracy was less than or equal to 6 cm RMSEz within individual swaths and less than or equal to 8 cm RMSEz or within swath overlap (between adjacent swaths). 5) The technicians ran a final vertical accuracy check of the boresighted flight lines against the surveyed check points after the z correction to ensure the requirement of NVA = 19.6 cm 95% Confidence Level (Required Accuracy) was met. Point classification was performed according to USGS Lidar Base Specification 1.4, and breaklines were collected for water features. Bare earth DEMs were exported from the classified point cloud using collected breaklines for hydroflattening.

Process Date/Time: 2021-08-04 00:00:00

Process Step 2

CC ID: 1330518
Description:

LAS Point Classification:  The point classification was performed as described below.  Classification Filters were applied to aid in the definition of; terrain characteristics, and vegetation attribution to low, medium, or high.  Filtering processes address aspects of the data such as ground points, noise points, air points, low points, manmade features, and setting withheld and overlap bits.   The automated filtration defined: Low Vegetation at 0.5-5 feet, Medium Vegetation at 5-20 feet, and High Vegetation at >20 feet by distance from the ground. Classifying low vegetation to class code 3, medium vegetation to class code 4, and high vegetation to class code 5 respectively.  These vegetation classes represent all non-noise points that fall into the distances above the ground surface, and will likely include buildings, utility poles, power lines, and other infrastructure.  The Classified point cloud data was manually reviewed to ensure correct classification of; ground (ASPRS class 2).  After the bare earth surface was finalized, it was then used to generate all hydro-breaklines through heads-up digitization.  All ground (ASPRS class 2) lidar data inside of the Inland Ponds and Lakes, and Inland Streams and Rivers are classified to water (ASPRS class 9).  A buffer of 2.5 feet was used around each hydro-flattened feature to classify ground (ASPRS class 2) to ignored ground (ASPRS class 20).  Island features were checked to ensure that Ground point (ASPRS class 2) remained classified as Ground.  Ground points (ASPRS class 2) within 2.5 feet of bridge breaklines, used to reduce triangulation between bridge decks were also classified to Ignored ground (ASPRS class 20).  All bridge decks were classified to Bridge deck (ASPRS class 17).  All remaining points were filtered, or manually classified to their respective point classification; processed (ASPRS class 1), low vegetation (ASPRS class 3), medium vegetation (ASPRS class 4), high vegetation (ASPRS class 5), low noise (ASPRS class 7), high noise (ASPRS class 18).  TerraScan version 021.005 was used to identify the withheld and overlap flag and bit set flags to LAS v1.4 specifications. LP360 64bit was used to deduce the Well Known Text (WKT) and an ASI proprietary software was used to format the LAS to the final LAS v1.4 Format 6 version. LAStools by rapidlasso GmbH, open source, lasvalidate (open source LGPL) and an ASI proprietary software was used to perform final analysis to checks on LAS header information, LAS point classes, and LAS timestamps.

Process Date/Time: 2022-05-18 00:00:00

Process Step 3

CC ID: 1330519
Description:

Data was tested at 0.5 meter nominal pulse spacing and a 4 pulses per meter. The nominal pulse spacing was tested on classified tiled LAS using geometrically reliable first-return points. NPS was tested using Delaunay Triangulation that produced average point spacing between all nearest neighbors.

Process Date/Time: 2021-08-04 00:00:00

Process Step 4

CC ID: 1330569
Description:

Original point clouds in LAS/LAZ format were restructured as Entwine Point Tiles and stored on Amazon Web Services. The data were re-projected horizontally to WGS84 web mercator (EPSG 3857) and no changes were made to the vertical (NAVD88 GEOID18 meters).

Process Contact: U.S. Geological Survey

Process Step 5

CC ID: 1330570
Description:

The NOAA Office for Coastal Management (OCM) created references to the Entwine Point Tiles (EPT) that were ingested into the NOAA Digital Coast Data Access Viewer (DAV). No changes were made to the data. The DAV will access the point cloud as it resides on Amazon Web Services (AWS) under the usgs-lidar-public container.

These are the AWS URLs being accessed:

https://s3-us-west-2.amazonaws.com/usgs-lidar-public/IL_SouthCentral_1_2021/ept.json

https://s3-us-west-2.amazonaws.com/usgs-lidar-public/IL_SouthCentral_2_2021/ept.json

Process Date/Time: 2024-04-04 00:00:00
Process Contact: Office for Coastal Management (OCM)

Catalog Details

Catalog Item ID: 72389
GUID: gov.noaa.nmfs.inport:72389
Metadata Record Created By: Rebecca Mataosky
Metadata Record Created: 2024-04-05 15:54+0000
Metadata Record Last Modified By: Rebecca Mataosky
Metadata Record Last Modified: 2024-05-31 19:52+0000
Metadata Record Published: 2024-04-05
Owner Org: OCMP
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Last Review Date: 2024-04-05
Metadata Review Frequency: 1 Year
Metadata Next Review Date: 2025-04-05