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Short Citation:
OCM Partners, 2022: 2008 USGS Lidar: Twelve County, Illinois (Grundy, Kane, McHenry only), https://www.fisheries.noaa.gov/inport/item/49760.

Item Identification

Title: 2008 USGS Lidar: Twelve County, Illinois (Grundy, Kane, McHenry only)
Short Name: il2008_usgs_12county_grundy_kane_mchenry_m5020_metadata
Status: Completed
Publication Date: 2016-04-13
Abstract:

This LiDAR data is within Illinois Department of Transportation districts 1 and 3 covering Grundy, Kane and McHenry counties. The data is updated from its original format to LAS version 1.2. The LiDAR data was collected in April 2008. Task Order Number: 3. Data was acquired by Quantum Spatial as project 1080208 with an Optech ALTM 3100 sensor equipped with an inertial measuring unit (IMU) and GPS receiver. The acquisition was to produce bare earth ASCII, LAS data and 2 foot contour Shapefiles. Only the counties of Grundy, McHenry and Kane were included in the Digital Coast project, as the other nine counties are not directly related to NOAA OCM tools and internal products.

Purpose:

The LiDAR data is updated to be more compatible within the guidelines of the National Digital Elevation Program. (NDEP)

The Grundy County, Illinois LiDAR Acquisition project was to provide high accuracy bare-earth processed LiDAR data and produce 2 foot contours for the county, approximately 430 square miles. The Kane County, Illinois LiDAR Acquisition project was to provide high accuracy bare-earth processed LiDAR data and produce 2 foot contours for Kane county, approximately 525 square miles. The McHenry County, Illinois LiDAR Acquisition project was to provide high accuracy bare-earth processed LiDAR data and produce 2 foot contours for the county, approximately 610 square miles.

The project consisted of acquisition, post-processing, classification of LiDAR data and contour generation. The data was collected at nominal horizontal spacing of 1.2 meters based on the Illinois Stat Plane Coordinate System, East Zone 1201, related to the North American Datum of 1983 (NSRS2007). Vertical accuracy was to achieve a tested accuracy to support 2 foot mapping relative to the North American Vertical Datum of 1988. Original data delivered in reference to NAVD88 in ft.

Notes:

10404

Supplemental Information:

Reports for this project are available at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/5020/supplemental/il2008_usgs_12county_grundy_kane_mchenry_m5020_lidarreport.pdf

A footprint of this data set may be viewed in Google Earth at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/5020/supplemental/il2008_usgs_12county_grundy_kane_mchenry_m5020.kmz

Keywords

Theme Keywords

Thesaurus Keyword
ISO 19115 Topic Category
elevation
UNCONTROLLED
None Ground
None Terrain

Physical Location

Organization: Office for Coastal Management
City: Charleston
State/Province: SC

Data Set Information

Data Set Scope Code: Data Set
Maintenance Frequency: As Needed
Data Presentation Form: las
Entity Attribute Overview:

LAS 1.2 format (classes 1,2,7,8,9,10)

Entity Attribute Detail Citation:

none

Distribution Liability:

Any conclusions drawn from the analysis of this information are not the responsibility of Woolpert, USGS, NOAA, the Office for Coastal Management or its partners.

Support Roles

Data Steward

CC ID: 675907
Date Effective From: 2016-04-13
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: 675909
Date Effective From: 2016-04-13
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Metadata Contact

CC ID: 675910
Date Effective From: 2016-04-13
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: 675908
Date Effective From: 2016-04-13
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: 1137753
W° Bound: -88.706128
E° Bound: -88.197747
N° Bound: 42.4964285
S° Bound: 41.09793

Extent Group 1 / Time Frame 1

CC ID: 1137752
Time Frame Type: Range
Start: 2008-05-05
End: 2008-05-20

Spatial Information

Spatial Representation

Representations Used

Vector: Yes

Access Information

Security Class: Unclassified
Data Access Procedure:

This data can be obtained on-line at the following URL:

https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=5020

The data set is dynamically generated based on user-specified parameters.;

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. These data depict the heights at the time of the survey and are only accurate for that time.

Distribution Information

Distribution 1

CC ID: 741187
Download URL: https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=5020
Distributor:
File Name: Customized Download
Description:

Create custom data files by choosing data area, product type, map projection, file format, datum, etc.

Distribution 2

CC ID: 741188
Download URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/5020/index.html
Distributor:
File Name: Bulk Download
Description:

Simple download of data files.

URLs

URL 1

CC ID: 741190
URL: https://coast.noaa.gov/dataviewer
URL Type:
Online Resource

URL 2

CC ID: 741191
URL: https://coast.noaa.gov
URL Type:
Online Resource

URL 3

CC ID: 741192
URL: https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/5020/supplemental/il2008_usgs_12county_grundy_kane_mchenry_m5020.kmz
Name: Browse Graphic
URL Type:
Browse Graphic
File Resource Format: kmz
Description:

This graphic shows the lidar coverage for the 2008 USGS lidar collection of Grundy, Kane and McHenry counties. This is a portion of a larger project which covered 12 counties in northern Illinois.

Activity Log

Activity Log 1

CC ID: 675928
Activity Date/Time: 2016-05-23
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 675927
Activity Date/Time: 2017-11-14
Description:

Converted from FGDC Content Standards for Digital Geospatial Metadata (version FGDC-STD-001-1998) using 'fgdc_to_inport_xml.pl' script. Contact Tyler Christensen (NOS) for details.

Activity Log 3

CC ID: 718323
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 741189
Activity Date/Time: 2018-03-13
Description:

Partial upload to move data access links to Distribution Info.

Data Quality

Accuracy:

The vertical accuracy assessment is conducted by comparing ground survey check point z values to processed LiDAR data z values by horizontal proximity. Differences in z values are calculated to express an RMSEz value.

Vertical accuracy statement is based on the area of moderate to flat terrain. The accuracy of the LiDAR data as tested met the vertical accuracy of 1.19 foot or less standards, however, derived products may be less accurate in areas of dense vegetation due to a lesser number of points defining the bare-earth in these areas.

Horizontal Positional Accuracy:

All these data products were acquired at 1700 meters above mean terrain (AMT) and have a horizontal accuracy of 0.31 meters, with a nominal point spacing of 1.2 meters.

Vertical Positional Accuracy:

This data set was acquired, processed and checked for vertical accuracy in 2008. Vertical accuracy of the LiDAR data was assessed along guidelines of the time established for two foot contour intervals by Federal Emergency Management Agency and by methods of the American Society for Photogrammetry and Remote Sensing and the National Digital Elevation Program.

Vertical Accuracy Assessment values were established by a comparison of ground survey points to a Triangulated Irregular Network (TIN) of LiDAR points.

The Fundamental Vertical Accuracy (FVA) of the TIN is to achieve 1.19ft at a 95% confidence level in the "Open Terrain" land cover category according to ASPRS Guidelines to produce contours of two foot intervals.

The Consolidated Vertical Accuracy (CVA) of the TIN is to achieve 1.19ft at the 95th percentile according to ASPRS guidelines for points in all land cover categories. In 2009 the CVA value stated here was established using all ground survey points that were available. One hundred sixty (160) points included in the CVA evaluation were not indicated by a ground cover category. Therefore the quantity of points in the five ground cover categories do not equal the total used to establish the CVA.

Supplemental Vertical Accuracy (SVA) target value of the TIN is 1.19 ft at the 95th percentile as derived by the ASPRS guidelines in each land cover category evaluated. Land Cover categories are Open Terrain, Short Grass, Tall Grass, Brush, and Forest.

; Quantitative Value: 0.055 meters, Test that produced the value: Tested RMSE of the Classified Points = 5.5 cm (0.18 ft) in Open Terrain as tested against the TIN.

; Quantitative Value: 0.107 meters, Test that produced the value: Tested FVA of 10.7 cm (0.35 ft) at the 95% confidence level on 21 points in Open Terrain as tested against the TIN.

; Quantitative Value: 0.122 meters, Test that produced the value: Tested 12.2 cm (0.40 ft) SVA at the 95th Percentile on 21 points in Short Grass category against the TIN.

; Quantitative Value: 0.125 meters, Test that produced the value: Tested 12.5 cm (0.41 ft) SVA at the 95th Percentile on 22 points in Tall Grass category against the TIN.

; Quantitative Value: 0.192 meters, Test that produced the value: Tested 19.2 cm (0.63 ft) SVA at the 95th Percentile on 20 points in Brush category against the TIN.

; Quantitative Value: 0.192 meters, Test that produced the value: Tested 19.2 cm (0.63 ft) SVA at the 95th Percentile on 19 points in Forested category against the TIN.

; Quantitative Value: 0.094 meters, Test that produced the value: Tested 9.4 cm (0.31 ft) SVA at the 95th Percentile on 21 points in Open Terrain category against the TIN.

; Quantitative Value: 0.174 meters, Test that produced the value: Tested 17.4 cm (0.57 ft) CVA at the 95th Percentile on 103 points in all ground categories against the TIN.

Completeness Report:

Complete

Conceptual Consistency:

Data covers the area specified for this project.

Lineage

Sources

Grundy Co., IL LiDAR

CC ID: 1137746
Publish Date: 2008-12-29
Extent Type: Discrete
Extent Start Date/Time: 2008-04-16
Source Contribution:

This data source consists of LiDAR airborne acquisition, calibrated and classified, LAS version 1.1, and hydro breaklines. | Source Geospatial Form: raster digital data | Type of Source Media: disc

Illinois Twelve Counties LiDAR Processing, 1130113

CC ID: 1137747
Publish Date: 2014-06-12
Extent Type: Discrete
Extent Start Date/Time: 2008-04-16
Source Contribution:

This data source consists of LiDAR update, reclassification, LAS version 1.2, Digital Elevation Models (DEM) and hydro breaklines. | Source Geospatial Form: remote sensing data | Type of Source Media: disc

Process Steps

Process Step 1

CC ID: 1137748
Description:

The LiDAR data was captured using twin-engine fixed wing aircraft equipped with a LiDAR system. The LiDAR system includes a differential GPS unit and inertial measurement system to provide superior accuracy. LiDAR swaths are inspected, aligned to one another and indexed to surface check points. Data points are classified, inspected and breaklines added. Derivative data products are produced for delivery.

Acquisition parameters:

1. Scanner - Optech ALTM 3100 EA

2. Flight Height - 1700 m above mean terrain

3. Swath Width - 18 degrees

4. Sidelap - 33%

5. Nominal Post Spacing - 1.2 m.

GPS and IMU processing parameters:

1. Processing Programs and version - Applanix - POSGPS and POSProc, versions 4.31

2. Max PDOP during LiDAR collection - 3.0

3. Max distance from GPS base stations during collection - less than 25 km

4. Mean differential baseline length - 15 km

5. Minimum number of base stations during LiDAR collection - 2

6. IMU processing monitored for consistency and smoothness - Yes.

Point Cloud Processing:

1. Program and version - Dashmap, version 3.0005

2. Horizontal Datum - NAD83(NSRS2007)

3. Horizontal Coordinates - Illinois State Plane Coordinate System, 1201, East Zone, in US Survey Foot

4. Vertical Datum - NAVD88

5. Geoid Model used to reduce satellite derived elevations to orthometric heights - NGS Geoid03.

LIDAR Processing:

1. Processing Programs and versions - TerraSolid TerraScan (version 008.009) and TerraMatch (version 008.006) and Intergraph MicroStation (version 08.01.02.15).

2. Point Cloud data is imported to TerraScan in a Microstation V8 (V) CAD environment on a specified 5000 foot by 5000 foot tiling scheme.

3. Analyze the data for overall completeness and consistency. This is to ensure that there are no voids in the data collection.

4. Inspect for calibration errors in the dataset using the TerraMatch software. This is accomplished by sampling the data collected across all flight lines and classify the individual lines to ground. The software will use the ground-classified lines to compute corrections (Heading, Pitch, Roll, and Scale).

5. Orientation corrections (i.e. Calibration corrections) are then applied to the entire dataset.

6. Automatic ground classification is performed using algorithms with customized parameters to best fit the project area. Several areas of varying relief and planimetric features were inspected to verify the final ground surface.

7. Quantum Spatial provided Quality Assurance and Quality Control (QAQC) data for this project. Quantum Spatial captured 103 QA/QC points in multiple land cover categories that were used to test the accuracy of the LiDAR data. TerraScan's Output Control Report (OCR) was used to compare the QAQC data to the LIDAR data. This routine searches the LIDAR dataset by X and Y coordinates, finds the closest LIDAR point and compares the vertical (Z) values to the known data collected in the field. Based on the QAQC data, a bias adjustment was determined, and the results were applied to the LIDAR data.

8. Once the automatic processing and the testing of LiDAR is complete, Quantum Spatial reviews the generated bare-earth surface data to insure that proper classification was achieved as part of a Quality Control process.

9. Final deliverables are generated and output to a client specified 2000 ft by 2000 ft tiling scheme.

Process Date/Time: 2008-12-29 00:00:00
Source: Grundy Co., IL LiDAR

Process Step 2

CC ID: 1137749
Description:

LiDAR data acquired and processed in 2008 is reprocessed in LAS tiles to LAS version 1.2. The data is reclassified to ASPRS point classification. Derivative data products are produced for delivery.

Processing programs and versions - TerraSolid TerraScan (version 013.004), TerraModeler (version 013.002) and TerraMatch (version 013.002) and Intergraph MicroStation (version.08.05.02.70).

1. LAS version 1.0 data is processed through TScan to assign point classifications as:

Class 1: Processed, but unclassified / non-ground

Class 2: Ground

Class 7: Noise / Low Points

Class 8: Model Key Points (mass points)

Class 9: Water

Class 10: Ignored Ground, (Breakline proximity)

2. Data is written to LAS version 1.2 format files on a per tile base 2000 feet by 2000 feet.

3. Bare earth DEM files are generated from classified LAS ground data and output as hydro flattened with breaklines to delineate surface water as it was present at the time of data acquisition.

4. Using TerraScan, the DEMs are generated in an ASCII format on a per tile basis with neighboring tile information available to minimize seams between tiles. These DEM are reviewed using GlobalMapper for adherence and completeness to the data and tile layout used during the creation process.

5. Following review acceptance, the ASCII files are processed through GlobalMapper into a FLOAT format. These files are converted using ArcMap to the delivered GRID format.

Process Date/Time: 2013-12-01 00:00:00
Source: Illinois Twelve Counties LiDAR Processing, 1130113

Process Step 3

CC ID: 1137750
Description:

The NOAA Office for Coastal Management (OCM) received the files in laz format from USGS via an FTP online repository. The files contained lidar elevation and intensity measurements. The data were in State Plane Illinois East, NAVD88 (orthometric) feet. OCM performed the following processing for data storage and Digital Coast provisioning purposes:

1. The data were converted from State Plane coordinates to geographic coordinates.

2. The data were converted from NAVD88 (orthometric) heights in international feet to GRS80 (ellipsoid) heights in meters using Geoid 03.

3. The LAS data were sorted by latitude and the headers were updated.

4. Erroneous elevations were removed.

5. The LAS tiles were retiled to remove overlap between McHenry and Kane counties.

Process Date/Time: 2016-03-15 00:00:00

Catalog Details

Catalog Item ID: 49760
GUID: gov.noaa.nmfs.inport:49760
Metadata Record Created By: Anne Ball
Metadata Record Created: 2017-11-15 15:22+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2022-08-09 17:11+0000
Metadata Record Published: 2022-03-16
Owner Org: OCMP
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Last Review Date: 2022-03-16
Metadata Review Frequency: 1 Year
Metadata Next Review Date: 2023-03-16