Illinois Department of Transportation, District 7, LiDAR

Metadata:
Identification_Information:
Citation:
Citation_Information:
Originator: AeroMetric, Inc.
Publication_Date: 20120625
Title:
Illinois Department of Transportation, District 7, LiDAR
Geospatial_Data_Presentation_Form: remote-sensing image
Publication_Information:
Publication_Place: Sheboygan, WI
Publisher: AeroMetric, Inc.
Description:
Abstract:

This task order is for planning, acquisition, processing, and derivative products of LiDAR data to be collected for areas of Illinois. LiDAR data, and derivative products produced in compliance with this task order are part of the data to be obtained under Job Number P-99-005-10. Specifications listed below are based on the U.S. Geological Survey National Geospatial Program Base LiDAR Specification, Version 13.
Purpose:

LiDAR data was collected for the Illinois Department of Transportation. The Illinois Department of Transportation LiDAR Acquisition project is to acquire high accuracy bare-earth processed LiDAR data to produce .dgn vector files, DAT files and Triangulated Integrated Network (TIN) files.

The data refers to District 7 in southern Illinois, including the counties of Clay, Clark, Coles, Crawford, Cumberland, Edwards, Effingham, Fayette, Jasper, Lawrence, Macon, Moultrie, Richland, Shelby, Wabash and Wayne in the state of Illinois.

The project consisted of acquisition, post-processing, classification of LiDAR data, and creation of final deliverable products. All areas are collected at a nominal pulse spacing (NPS) of 1.0 meters based on UTM16, related to the North American Datum of 1983 HARN. Vertical accuracy was to achieve a RMSE Z of 0.6 feet or better in the "Open Terrain" land cover category.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 201103
Ending_Date: 201104
Currentness_Reference:
ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Description_of_Geographic_Extent:
Bounding_Coordinates:
West_Bounding_Coordinate: -89.258
East_Bounding_Coordinate: -87.48200
North_Bounding_Coordinate: 40.05700
South_Bounding_Coordinate: 38.230
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: Light Detection and Ranging
Theme_Keyword: LiDAR
Theme_Keyword: Breaklines
Theme_Keyword: Shapefiles
Theme_Keyword: Survey Control
Theme_Keyword: Lift
Theme_Keyword: LAS
Theme_Keyword: Swath
Theme_Keyword: Project
Theme_Keyword: DAT
Theme_Keyword: TIN
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: US
Place_Keyword: State
Place_Keyword: IL
Place_Keyword: Illinois
Place_Keyword: Clay
Place_Keyword: Clark
Place_Keyword: Coles
Place_Keyword: Crawford
Place_Keyword: Cumberland
Place_Keyword: Edwards
Place_Keyword: Effingham
Place_Keyword: Fayette
Place_Keyword: Jasper
Place_Keyword: Lawrence
Place_Keyword: Macon
Place_Keyword: Moultrie
Place_Keyword: Richland
Place_Keyword: Shelby
Place_Keyword: Wabash
Place_Keyword: Wayne
Access_Constraints: None.
Use_Constraints:
None. However, users should be aware that temporal changes may have occurred since this data set was collected and that 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.
Acknowledgment of the Illinois Department of Transportation, Bureau of Design and Environment, would be appreciated for products derived from these data.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Amy Eller
Contact_Organization: Illinois Department of Transportation, Aerial Survey Section
Contact_Address:
Address_Type: mailing and physical address
Address: 2300 South Dirksen Parkway, Room 005
City: Springfield
State_or_Province: IL
Postal_Code: 62764
Country: USA
Contact_Voice_Telephone: 217-782-4748
Contact_TDD/TTY_Telephone: unknown
Contact_Facsimile_Telephone: unknown
Contact_Electronic_Mail_Address: Amy.Eller@illinois.gov
Hours_of_Service: unknown
Contact Instructions: none
Data_Set_Credit:
AeroMetric, Inc.
Native_Data_Set_Environment:
1. Scanner - Optech Gemini, Serial 07SEN20, and 03SEN145
2. Processing Programs and versions - Applanix POSGPS and POSProc, versions 4.4, MMS version 5.2
3. Program and version - Optech ASDA
4. Processing Programs and versions - TerraSolid TerraScan (version 012.005), TerraModeler (version 012.002) and TerraMatch (version 012.001), Geopak (version 08.01.00.07), Intergraph MicroStation (version 08.05.02.55), and GeoCue (version 2011.1.20.0).
5. Viewing Program - GlobalMapper V12.00
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Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The Fundamental Vertical Accuracy (FVA) of the Classified Bare Earth files achieved is 0.473 feet at a 95% confidence level with an RMSE of 0.241 feet. Seven thousand sixteen (7016) 'open terrain' or hard surface survey control points were used in this evaluation.

The Supplemental Vertical Accuracy (SVA) results Hard Surface achieved 0.477 feet at the 95th Percentile, SVA checkpoints were assessed and reported against the derived TIN.

The Supplemental Vertical Accuracy (SVA) results Short Grass achieved 0.458 feet at the 95th Percentile, SVA checkpoints were assessed and reported against the derived TIN.

The Supplemental Vertical Accuracy (SVA) results Tall Grass achieved 0.644 feet at the 95th Percentile, SVA checkpoints were assessed and reported against the derived TIN.

The Supplemental Vertical Accuracy (SVA) results Brush achieved 0.801 feet at the 95th Percentile, SVA checkpoints were assessed and reported against the derived TIN.

The Supplemental Vertical Accuracy (SVA) results Trees achieved 0.702 feet at the 95th Percentile, SVA checkpoints were assessed and reported against the derived TIN.

The Consolidated Vertical Accuracy (CVA) results for all Land Cover Classes combined achieved 0.531 feet at the 95th Percentile, CVA checkpoints were assessed and reported against the derived TIN surface models.
Logical_Consistency_Report:
None.
Completeness_Report:
Complete.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
All data collected with the Optech Gemini, were acquired at or below 1600 meters above mean terrain (AMT) and have a horizontal accuracy of 0.30 meters (per manufacturers system specifications), with a nominal point spacing of 1.0 meters.
Lineage:
Process_Step:
Process_Description:
The LiDAR data was captured using AeroMetric's twin-engine aircraft, equipped with LiDAR systems. The LiDAR system includes a differential GPS unit and inertial measurement system to provide superior accuracy.

Acquisition parameters:
1. Flight Height - 1600 meters above mean terrain (AMT)
2. Swath Width - 40 degrees
3. Sidelap - 50%
4. Nominal Post Spacing - 1.0 meters

GPS and IMU processing parameters:
1. Maximum baseline length - Not greater than 100 kilometers.
2. Number of base stations during LiDAR collection - A minimum of 1.
3. Maximum positional RMS of trajectory during LiDAR collection - 0.10 meters
4. IMU processing monitored for consistency and smoothness - Yes.

Point Cloud Processing:
1. Horizontal Datum - North American_1983/HARN
2. Horizontal Coordinates - NAD_1983_HARN_StatePlane_Illinois_East_FIPS_1201_Feet.
3. Vertical Datum - North American Vertical Datum of 1988
4. Geoid Model used to reduce satellite derived elevations to orthometric heights - NGS Geoid09.

LiDAR Processing:
1. Point Cloud data is imported to TerraScan in a Microstation V8 (V) CAD environment on a specified 2000 feet by 2000 feet tiling scheme.
2. Analyze the data for overall completeness and consistency. This is to ensure that there are no voids in the data collection.
3. Inspect for calibration errors in the dataset using the TerraMatch software by sampling the data collected across all flight lines and classifing the individual lines to ground. The software will use the ground-classified lines to compute corrections (Heading, Pitch, Roll, and Scale).
4. Orientation corrections (i.e. Calibration corrections) are then applied (if needed) to the entire dataset.
5. 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.
6. AeroMetric, Inc. provided Quality Assurance and Quality Control (QA/QC) data for this project. AeroMetric captured QA/QC points in 'open terrain' land cover category that were used to test the accuracy of the LiDAR ground surface. TerraScan's Output Control Report (OCR) was used to compare the QA/QC data to the LiDAR data. This routine searches the LiDAR dataset by X and Y coordinates finding the closest LiDAR point and comparing the vertical (Z) values to the known data collected in the field. Based on the QA/QC data, a bias adjustment was determined, and the results were applied (if necessary) to the LiDAR data.
7. After the LiDAR data is finalized for vertical placement, a macro is run via TerraScan to output a dataset generated on a per swath basis as part of the final deliverables. All points of the swath are reclassified to class 0 during this step.
8. Each tile is reviewed for accuracy and consistency of the macro ground classification. During this phase, MicroStation is used to generate line work representing water bodies and rivers. Separate line work is also placed in instances where overpasses have blocked enough valid ground returns or water gave too few ground returns to reasonably portray the ground surface. A proprietary in-house software program is then run to drape the river line work in a flowing fashion. Contours are generated on the river breaklines to review monotonicity of the draped line work.
9. Once the automatic processing and the testing of LiDAR is complete, AeroMetric meticulously reviews the generated bare-earth surface data to ensure that proper classification was achieved as part of a Quality Control process.
10. Final deliverables are generated and output to a client specified 2000 feet by 2000 feet tiling scheme.
11. On a per tile basis, data files and Triangulated Integrated Network (TIN) files are generated by processing the finalized line work along with bare earth LiDAR points though a Geopak marco. Subsequent files are reviewed for adherence and completeness to the data and tile layout used during the creation process.
Process_Date: 201206
Cloud_Cover: Unknown
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Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Point
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Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: State Plane Coordinate System 1983
State_Plane_Coordinate_System:
SPCS_Zone_Identifier: 1201
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.999975
Longitude_of_Central_Meridian: 88.33333
Latitude_of_Projection_Origin: 36.66666
False_Easting: 984250.0
False_Northing: 0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.01
Ordinate_Resolution: 0.01
Planar_Distance_Units: survey feet
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983/HARN
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137
Denominator_of_Flattening_Ratio: 298.25722210088
Vertical_Coordinate_System_Definition:
Altitude_System_Definition:
Altitude_Datum_Name: North American Vertical Datum of 1988
Altitude_Resolution: 0.1
Altitude_Distance_Units: feet
Altitude_Encoding_Method: Explicit elevation coordinate included with horizontal coordinates
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Metadata_Reference_Information:
Metadata_Date: 20120626
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: AeroMetric, Inc.
Contact_Address:
Address_Type: Mailing and physical address
Address: 4020 Technology Parkway
City: Sheboygan
State_or_Province: WI
Postal_Code: 53083-6049
Country: US
Contact_Voice_Telephone: 1-920-457-3631
Contact_Facsimile_Telephone: 1-920-457-0410
Contact_Electronic_Mail_Address: cguy@aerometric.com
Hours_of_Service: Monday through Friday 8:00 AM to 5:00 PM (Central Time)
Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
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