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Summary

Short Citation
OCM Partners, 2024: 2017 USGS Lidar: La Salle 4 County, IL, https://www.fisheries.noaa.gov/inport/item/70466.
Full Citation Examples

Abstract

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

Geographic Extent:

USGS_LPC_IL_LaSalle_B1 -

LaSalle County, Illinois, covering approximately 1,148 square miles. LaSalle County is one area of interest (AOI) from a lidar survey that was collected over two (2) areas of interest in Illinois identified as LaSalle and Expansion Counties.

USGS_LPC_IL_LaSalle_B2 -

Grundy, Kendall, and DeKalb County, Illinois (Expansion Counties), covering approximately 1,388 square miles. Grundy, Kendall, and DeKalb Counties are one area of interest (AOI) from a lidar survey that was collected over two (2) areas of interest in Illinois identified as LaSalle and Expansion Counties.

LaSalle County and the Expansion Counties cover a total of approximately 2,563 square miles.

Dataset Description:

LaSalle county, Illinois 2017 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 meter. Project specifications are based on the U.S. Geological Survey National Geospatial Program Base Lidar Specification, Version 1.2; Quality Level 2+. The data was developed based on a horizontal projection/datum of NAD83 (2011), State Plane Coordinate System Illinois East (FIPS 1201), US Survey Feet and vertical datum of NAVD88 (GEOID12B), US Survey Feet. Lidar data was delivered as flightline-extent unclassified LAS swaths, as processed Classified LAS 1.4 files, formatted to 8241 individual 2000 foot x 2000 foot tiles, as tiled Intensity Imagery, and as tiled bare earth DEMs; all tiled to the same 2000 foot x 2000 foot schema.

Grundy, Kendall, and DeKalb Counties, Illinois 2017 Lidar project called for the Planning, Acquisition, processing and derivative products of lidar data to be collected at a nominal pulse spacing (NPS) of 0.7 meter. Project specifications are based on the U.S. Geological Survey National Geospatial Program Base Lidar Specification, Version 1.2; Quality Level 2. The data was developed based on a horizontal projection/datum of NAD83 (2011), State Plane Coordinate System Illinois East (FIPS 1201), US Survey Feet and vertical datum of NAVD88 (GEOID12B), US Survey Feet. Lidar data was delivered as flightline-extent unclassified LAS swaths, as processed Classified LAS 1.4 files, formatted to 10097 individual 2000 foot x 2000 foot tiles, as tiled Intensity Imagery, and as tiled bare earth DEMs; all tiled to the same 2000 foot x 2000 foot schema.

Ground Conditions:

Lidar was collected in November 2017. Due to an isolated anomaly found in the the lidar data in LaSalle County one re-flight was flown in April 2018, while no snow was on the ground and rivers were at or below normal levels. A Low Confidence polygon was use to circumscribe an area where lidar was reflected by particulates in smoke stack emission. Photons were unable to penetrate through the emissions for collection of ground surface within the polygon. The emission cloud obscures approximately 3.72 acres of ground surface. Tiles in which the emission cloud occurred are 99101727 and 99301727. In order to post process the lidar data to meet task order specifications and meet ASPRS vertical accuracy guidelines, GRW Aerial Surveys, Inc. established a total of 53 ground control points of which 50 were used to calibrate the lidar to known ground locations established throughout the LaSalle and Expansion Counties project areas. An additional 157 independent accuracy checkpoints, 89 in Bare Earth and Urban landcovers (89 NVA points), 68 in tall Grass/tall weeds/crops, Brush lands/short trees, Forested categories (68 VVA points), were used to assess the vertical accuracy of the data of the entire project area. 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

  • 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 from USGS_LPC_IL_LaSalle_B1 in LAZ format, IL State Plane East, NAD83(2011), US survey feet coordinates and NAVD88 (Geoid12B) elevations in US survey feet.

  • LAS/LAZ - LASer

    Bulk download of data files from USGS_LPC_IL_LaSalle_B2 in LAZ format, IL State Plane East, NAD83(2011), US survey feet coordinates and NAVD88 (Geoid12B) elevations in 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. Acknowledgement of the U.S. Geological Survey would be appreciated for products derived from these data.

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
https://coast.noaa.gov

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

Extents

Geographic Area 1

-89.18° W, -88.23° E, 42.17° N, 40.92485° S

Time Frame 1
2018-04-12

Date of re-flight

Time Frame 2
2017-11-19 - 2017-11-23

Item Identification

Title: 2017 USGS Lidar: La Salle 4 County, IL
Short Name: il2017_lasalle_m9876_metadata
Status: Completed
Creation Date: 2017
Publication Date: 2018-09-05
Abstract:

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

Geographic Extent:

USGS_LPC_IL_LaSalle_B1 -

LaSalle County, Illinois, covering approximately 1,148 square miles. LaSalle County is one area of interest (AOI) from a lidar survey that was collected over two (2) areas of interest in Illinois identified as LaSalle and Expansion Counties.

USGS_LPC_IL_LaSalle_B2 -

Grundy, Kendall, and DeKalb County, Illinois (Expansion Counties), covering approximately 1,388 square miles. Grundy, Kendall, and DeKalb Counties are one area of interest (AOI) from a lidar survey that was collected over two (2) areas of interest in Illinois identified as LaSalle and Expansion Counties.

LaSalle County and the Expansion Counties cover a total of approximately 2,563 square miles.

Dataset Description:

LaSalle county, Illinois 2017 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 meter. Project specifications are based on the U.S. Geological Survey National Geospatial Program Base Lidar Specification, Version 1.2; Quality Level 2+. The data was developed based on a horizontal projection/datum of NAD83 (2011), State Plane Coordinate System Illinois East (FIPS 1201), US Survey Feet and vertical datum of NAVD88 (GEOID12B), US Survey Feet. Lidar data was delivered as flightline-extent unclassified LAS swaths, as processed Classified LAS 1.4 files, formatted to 8241 individual 2000 foot x 2000 foot tiles, as tiled Intensity Imagery, and as tiled bare earth DEMs; all tiled to the same 2000 foot x 2000 foot schema.

Grundy, Kendall, and DeKalb Counties, Illinois 2017 Lidar project called for the Planning, Acquisition, processing and derivative products of lidar data to be collected at a nominal pulse spacing (NPS) of 0.7 meter. Project specifications are based on the U.S. Geological Survey National Geospatial Program Base Lidar Specification, Version 1.2; Quality Level 2. The data was developed based on a horizontal projection/datum of NAD83 (2011), State Plane Coordinate System Illinois East (FIPS 1201), US Survey Feet and vertical datum of NAVD88 (GEOID12B), US Survey Feet. Lidar data was delivered as flightline-extent unclassified LAS swaths, as processed Classified LAS 1.4 files, formatted to 10097 individual 2000 foot x 2000 foot tiles, as tiled Intensity Imagery, and as tiled bare earth DEMs; all tiled to the same 2000 foot x 2000 foot schema.

Ground Conditions:

Lidar was collected in November 2017. Due to an isolated anomaly found in the the lidar data in LaSalle County one re-flight was flown in April 2018, while no snow was on the ground and rivers were at or below normal levels. A Low Confidence polygon was use to circumscribe an area where lidar was reflected by particulates in smoke stack emission. Photons were unable to penetrate through the emissions for collection of ground surface within the polygon. The emission cloud obscures approximately 3.72 acres of ground surface. Tiles in which the emission cloud occurred are 99101727 and 99301727. In order to post process the lidar data to meet task order specifications and meet ASPRS vertical accuracy guidelines, GRW Aerial Surveys, Inc. established a total of 53 ground control points of which 50 were used to calibrate the lidar to known ground locations established throughout the LaSalle and Expansion Counties project areas. An additional 157 independent accuracy checkpoints, 89 in Bare Earth and Urban landcovers (89 NVA points), 68 in tall Grass/tall weeds/crops, Brush lands/short trees, Forested categories (68 VVA points), were used to assess the vertical accuracy of the data of the entire project area. 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, vegetation, and building rooftops for use to support the 3DEP mission, the FEMA Risk MAP program, NRCS agricultural conservation practice planning in support of the Illinois Nutrient Loss Reduction Strategy and the Mississippi River Basin Initiative, NPS studies of the Illinois and Michigan Canal National Heritage Corridor and USACE hydrologic studies of the Fox River Basin. Classified LAS files are used to show the manually reviewed bare earth surface. This allows the user to create Intensity Images, Breaklines, and Raster DEM. The purpose of these 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. G17PD00317 CONTRACTOR: Aerial Services, Inc. Lidar data was acquired and calibrated by the prime contractor. SUBCONTRACTOR: GRW Aerial Surveys, Inc. preformed hydro collection for northern 2/3 section of LaSalle 2+ project area from bare earth surface supplied by prime. GRW Aerial Surveys, Inc. then undertook manual building cleanup for the central 1/3 of the project from classified LAS supplied by prime. SUBCONTRACTOR: Survey And Mapping, LLC (SAM) manually edited bare earth surface, preformed hydro collection, flattening, and produced bare earth DEMs for the southcentral 1/3 of the project area. All follow-on manual editing and processing was completed by the prime contractor.

The following are the USGS lidar fields in JSON:

{

"ldrinfo" : {

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

"ldrsens" : "Leica ALS70-HP Airborne LiDAR Scanner",

"ldrmaxnr" : "4",

"ldrnps" : "0.5",

"ldrdens" : "4",

"ldranps" : "0.5",

"ldradens" : "4",

"ldrfltht" : "1100",

"ldrfltsp" : "150",

"ldrscana" : "50",

"ldrscanr" : "47",

"ldrpulsr" : "240",

"ldrpulsd" : "4",

"ldrpulsw" : "0.25",

"ldrwavel" : "1064",

"ldrmpia" : "1",

"ldrbmdiv" : "0.22",

"ldrswatw" : "1025",

"ldrswato" : "30",

"ldrgeoid" : "National Geodetic Survey (NGS) Geoid12B"

},

"ldraccur" : {

"ldrchacc" : "0.12",

"rawnva" : "0.094",

"rawnvan" : "89",

"clsnva" : "0.103",

"clsnvan" : "89",

"clsvva" : "0.272",

"clsvvan" : "68"

},

"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" : "6",

"clasitem" : "Building"

},

"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"

}

}}

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: 1264941
Date Effective From: 2023
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: 1264940
Date Effective From: 2023
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: 1264960
Date Effective From: 2018
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: 1264942
Date Effective From: 2023
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: 1264943
Date Effective From: 2023
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: 1264946
W° Bound: -89.18
E° Bound: -88.23
N° Bound: 42.17
S° Bound: 40.92485

Extent Group 1 / Time Frame 1

CC ID: 1264961
Time Frame Type: Discrete
Start: 2018-04-12
Description:

Date of re-flight

Extent Group 1 / Time Frame 2

CC ID: 1264945
Time Frame Type: Range
Start: 2017-11-19
End: 2017-11-23

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: 1264962

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: 1343115

Coordinate Reference System

CRS Type: Vertical
EPSG Code: EPSG:5703
EPSG Name: NAVD88 height
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. Acknowledgement of the U.S. Geological Survey would be appreciated for products derived from these data.

Distribution Information

Distribution 1

CC ID: 1264947
Start Date: 2023-08-14
End Date: Present
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=9876/details/9876
Distributor: NOAA Office for Coastal Management (NOAA/OCM) (2023 - 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 Type (Deprecated): Zip
Compression: Zip

Distribution 2

CC ID: 1264948
Start Date: 2018
End Date: Present
Download URL: https://rockyweb.usgs.gov/vdelivery/Datasets/Staged/Elevation/LPC/Projects/USGS_LPC_IL_LaSalle_B1_2017_LAS_2019/laz/
Distributor: U.S. Geological Survey (2018 - Present)
File Name: Bulk Download - USGS_LPC_IL_LaSalle_B1_2017_LAS_2019
Description:

Bulk download of data files from USGS_LPC_IL_LaSalle_B1 in LAZ format, IL State Plane East, NAD83(2011), US survey feet coordinates and NAVD88 (Geoid12B) elevations in US survey feet.

File Type (Deprecated): LAZ
Distribution Format: LAS/LAZ - LASer
Compression: Zip

Distribution 3

CC ID: 1264964
Start Date: 2018
End Date: Present
Download URL: https://rockyweb.usgs.gov/vdelivery/Datasets/Staged/Elevation/LPC/Projects/USGS_LPC_IL_LaSalle_B2_2017_LAS_2019/laz/
Distributor: U.S. Geological Survey (2018 - Present)
File Name: Bulk Download - USGS_LPC_IL_LaSalle_B2_2017_LAS_2019
Description:

Bulk download of data files from USGS_LPC_IL_LaSalle_B2 in LAZ format, IL State Plane East, NAD83(2011), US survey feet coordinates and NAVD88 (Geoid12B) elevations in US survey feet.

File Type (Deprecated): LAZ
Distribution Format: LAS/LAZ - LASer
Compression: Zip

URLs

URL 1

CC ID: 1264939
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: 1264965
URL: https://rockyweb.usgs.gov/vdelivery/Datasets/Staged/Elevation/metadata/IL_LaSalle_County_QL2_Plus_Lidar_2017_B17/
Name: USGS Additional Info
URL Type:
Online Resource
Description:

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

URL 3

CC ID: 1264966
URL: https://rockyweb.usgs.gov/vdelivery/Datasets/Staged/Elevation/metadata/IL_LaSalle_County_QL2_Plus_Lidar_2017_B17/IL_LaSalle_B1_2017/reports/IL_LaSalle%20County%20QL2+Lidar%202017%20Final%20Report.pdf
Name: Lidar Report - USGS_LPC_IL_LaSalle_B1 (LaSalle County)
URL Type:
Online Resource
File Resource Format: pdf
Description:

Link to the Aerial Services, Inc. lidar report for USGS_LPC_IL_LaSalle_B1

URL 4

CC ID: 1264967
URL: https://rockyweb.usgs.gov/vdelivery/Datasets/Staged/Elevation/metadata/IL_LaSalle_County_QL2_Plus_Lidar_2017_B17/IL_LaSalle_B2_2017/reports/IL_LaSalle%20Expansion%20Counties%20QL2_Lidar%202017%20Final%20Report.pdf
Name: Lidar Report - USGS_LPC_IL_LaSalle_B2 (DeKalb, Grundy, Kendall Counties)
URL Type:
Online Resource
File Resource Format: pdf
Description:

Link to the Aerial Services, Inc. lidar report for USGS_LPC_IL_LaSalle_B2

URL 5

CC ID: 1264968
URL: https://s3-us-west-2.amazonaws.com/usgs-lidar-public/USGS_LPC_IL_LaSalle_B1_2017_LAS_2019/ept.json
Name: USGS Entwine Point Tile (EPT) - USGS_LPC_IL_LaSalle_B1 (LaSalle County)
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 6

CC ID: 1264969
URL: https://s3-us-west-2.amazonaws.com/usgs-lidar-public/USGS_LPC_IL_LaSalle_B2_2017_LAS_2019/ept.json
Name: USGS Entwine Point Tile (EPT) - USGS_LPC_IL_LaSalle_B2 (DeKalb, Grundy, Kendall Counties)
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 7

CC ID: 1264970
URL: https://usgs.entwine.io/data/view.html?r=[%22https://s3-us-west-2.amazonaws.com/usgs-lidar-public/USGS_LPC_IL_LaSalle_B1_2017_LAS_2019/ept.json%22,%22https://s3-us-west-2.amazonaws.com/usgs-lidar-public/USGS_LPC_IL_LaSalle_B2_2017_LAS_2019/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.

Data Quality

Horizontal Positional Accuracy:

Eighteen checkpoints were determined to be photo-identifiable in the intensity imagery and were used to test the horizontal accuracy of the LiDAR dataset. As only eighteen (18) checkpoints were photo-identifiable, the results are not statistically significant enough to report as a final tested value, but the results of the testing are still shown in the table below. Using NSSDA methodology (endorsed by the ASPRS Positional Accuracy Standards for Digital Geospatial Data (2014)), horizontal accuracy at the 95% confidence level (called ACCURACYr) is computed by the formula RMSEr * 1.7308 or RMSExy * 2.448. No horizontal accuracy requirements or thresholds were provided for this project. However, LiDAR datasets are generally calibrated by methods designed to ensure a horizontal accuracy of 1 meter or less.

Actual positional accuracy of this dataset was found to be RMSEx = 0.129 ft (3.931 cm) and RMSEy = 0.183 (5.578 cm) which equates to +/- 0.658 ft (20.056 cm) at 95% confidence level.

Vertical Positional Accuracy:

For the vertical accuracy assessment of IL_LaSalle and Expansion Counties project, one hundred fifty seven check points were surveyed. Eighty nine of those check points are located within bare earth/open terrain (89 NVA points). Sixty eight check points are located within grass/weeds/crops, brush/low trees, and forested/fully grown land cover categories (68 VVA points). Checkpoints were evenly distributed throughout the project area so as to cover as many flight lines as possible using the dispersed method of placement. These checkpoints were not used to calibrate or post process the data.

For the IL_LaSalle QL2+ and Expansion Counties QL2 project, the tested RMSEz of the classified LiDAR data for checkpoints in non-vegetated terrain equaled 5.26 cm (0.173 ft), compared with the 10 cm (0.33 ft) specification: and the NVA of the classified LiDAR data computed using RMSEz x 1.96 was equal to 10.31 cm (0.338 ft), compared with the 19.6 cm (0.64 ft) specification. For the IL_LaSalle QL2+ and Expansion Counties project, the tested VVA of the classified LiDAR data computed using the 95th percentile was equal to 27.21 cm (0.893 ft), compared with the 29.4 cm (0.96 ft) specification.

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-CO
How Will the Data Be Protected from Accidental or Malicious Modification or Deletion Prior to Receipt by the Archive?:

Data is backed up to tape and to cloud storage.

Lineage

Lineage Statement:

The NOAA Office for Coastal Management (OCM) ingested references to the USGS Entwine Point Tile (EPT) files 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) - USGS_LPC_IL_LaSalle_B1 (LaSalle County)

CC ID: 1264971
Contact Role Type: Publisher
Contact Type: Organization
Contact Name: USGS
Citation URL: https://s3-us-west-2.amazonaws.com/usgs-lidar-public/USGS_LPC_IL_LaSalle_B1_2017_LAS_2019/ept.json
Citation URL Name: Entwine Point Tile for USGS_LPC_IL_LaSalle_B1 (LaSalle County)

USGS AWS Entwine Point Tile (EPT) - USGS_LPC_IL_LaSalle_B2 (DeKalb, Grundy, Kendall Counties)

CC ID: 1264972
Contact Role Type: Publisher
Contact Type: Organization
Contact Name: USGS
Citation URL: https://s3-us-west-2.amazonaws.com/usgs-lidar-public/USGS_LPC_IL_LaSalle_B2_2017_LAS_2019/ept.json
Citation URL Name: Entwine Point Tile for USGS_LPC_IL_LaSalle_B2 (DeKalb, Grundy, Kendall Counties)

Process Steps

Process Step 1

CC ID: 1264934
Description:

LAS Point Classification QL2+: The point classification was performed as described below. Classification Filters were applied to aid in the definition of; terrain characteristics, vegetation attribution of low, medium or high and building rooftops. Filtering processes address aspects of the data such as: ground points, noise points, air points, low points, Low vegetation 0.5-5’, medium vegetation 5-20’, high vegetation >20’, building roof tops, withheld and overlap points. The Classified point cloud data was manually reviewed to ensure correct classification of; ground (ASPRS class 2), building rooftops (ASPRS class 6). After the bare earth surface was finalized, it is 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 classified to water (ASPRS class 9). A buffer of 2.5 was used around each hydro-flattened feature to classify ground (ASPRS class 2) to ignored ground (ASPRS class 10). 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 10). 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), buildings (ASPRS class 6), low noise (ASPRS class 7), high noise (ASPRS class 18). TerraScan version 28.06.2017 was used to verify point density, identify withheld and overlap flag bit set flags for the LAS data. LAStools by rapidlasso GmbH, open source las2las version 160119 was used for writing the well known text into the LAS header. Lasinfo was used to verify format and header information.

Process Date/Time: 2018-06-04 00:00:00

Process Step 2

CC ID: 1264973
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 elevations in NAVD88 (GEOID12B).

Process Contact: U.S. Geological Survey

Process Step 3

CC ID: 1264974
Description:

The NOAA Office for Coastal Management (OCM) created references to the Entwine Point Tile (EPT) files 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/USGS_LPC_IL_LaSalle_B1_2017_LAS_2019/ept.json

https://s3-us-west-2.amazonaws.com/usgs-lidar-public/USGS_LPC_IL_LaSalle_B2_2017_LAS_2019/ept.json

Process Date/Time: 2023-08-14 00:00:00
Process Contact: Office for Coastal Management (OCM)

Catalog Details

Catalog Item ID: 70466
GUID: gov.noaa.nmfs.inport:70466
Metadata Record Created By: Rebecca Mataosky
Metadata Record Created: 2023-08-14 18:19+0000
Metadata Record Last Modified By: Rebecca Mataosky
Metadata Record Last Modified: 2024-07-31 18:46+0000
Metadata Record Published: 2023-08-14
Owner Org: OCMP
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Last Review Date: 2023-08-14
Metadata Review Frequency: 1 Year
Metadata Next Review Date: 2024-08-14