Illinois Twelve Counties LiDAR Processing, Lee County, Illinois, Classified LAS USGS Contract G10PC0025, Task order G13PD00753
Metadata also available as
Metadata:
- Identification_Information:
-
- Citation:
-
- Citation_Information:
-
- Originator: Quantum Spatial, Inc. (formerly AeroMetric, Inc.)
- Publication_Date: 20140502
- Title:
-
Illinois Twelve Counties LiDAR Processing,
Lee County, Illinois, Classified LAS
USGS Contract G10PC0025, Task order G13PD00753
- Geospatial_Data_Presentation_Form: remote-sensing image
- Description:
-
- Abstract:
-
This LiDAR data is within Illinois Department of Transportation District 2 and includes Lee County, Illinois. The data is updated from its original format to LAS version 1.2.
The LiDAR data was collected in March 2009 as "Lee County, Illinois LiDAR Acquisition" - ILDOT Project No. AM151-059-04, PTB 151, Item59. Data was acquired by Quantum Spatial as project 1090716 with an Optech ALTM Gemini sensor equipped with an inertial measuring unit (IMU) and GPS receiver. The acquisition was to produce first return ASCII, bare earth ASCII, DAT and TIN files.
- Purpose:
-
The LiDAR data is updated to be more compatible within the guidelines of the National Digital Elevation Program. (NDEP)
The Lee County, Illinois LiDAR Acquisition project is to provide high accuracy bare-earth processed LiDAR data suitable for FEMA National Flood Insurance Program (NFIP) for the approximately 722 square miles of the county.
The project consisted of acquisition, post-processing, and classification of LiDAR data. The data was acquired with a nominal horizontal spacing of 1.0 meters based on the Illinois State Plane Coordinate System, West Zone, related to the North American Datum of 1983 (NSRS2007). Vertical accuracy was to achieve a Fundamental Vertical Accuracy (FVA) at a 95% confidence level of less than 1.19 ft in the "Open Terrain" land cover category.
- Time_Period_of_Content:
-
- Time_Period_Information:
-
- Single_Date/Time:
-
- Calendar_Date: 20090320
- Currentness_Reference: ground condition
- Status:
-
- Progress: Complete
- Maintenance_and_Update_Frequency: unknown
- Spatial_Domain:
-
- Bounding_Coordinates:
-
- West_Bounding_Coordinate: -89.635
- East_Bounding_Coordinate: -88.932
- North_Bounding_Coordinate: 41.914
- South_Bounding_Coordinate: 41.585
- Keywords:
-
- Theme:
-
- Theme_Keyword_Thesaurus: None
- Theme_Keyword: Elevation data
- Theme_Keyword: Light Detection and Ranging
- Theme_Keyword:
-
LIDAR
- Theme_Keyword: Bare Earth
- Theme_Keyword: Point Cloud
- Theme_Keyword: Breakline
- Theme_Keyword: DEM
- Theme_Keyword: LAS
- Place:
-
- Place_Keyword_Thesaurus: None
- Place_Keyword: US
- Place_Keyword: Illinois
- Place_Keyword: Dixon
- Place_Keyword: Lee County
- Access_Constraints: None
- Use_Constraints:
-
None. However, users should be aware that temporal changes may have occurred since this dataset was collected and that some parts of these data may no longer represent actual surface conditions. Users should not use these data for critical applications without a full awareness of its limitations. Acknowledgment of the Illinois Department of Transportation would be appreciated for products derived from these data.
In previous processing this dataset was trimmed to a project boundary that is inside the county boundary. The data does not extend to the county boundary in all places. The DEMs are trimmed to the previous boundary to avoid triangulation between data edge and county boundary. This affects ten (10) acres at the perimeter. The region is indicated with a shapefile: Lee_data_voids.shp.
- Point_of_Contact:
-
- Contact_Information:
-
- Contact_Organization_Primary:
-
- Contact_Organization: Quantum Spatial, Inc.
- Contact_Person: LiDAR Manager
- Contact_Position: LiDAR Manager
- Contact_Address:
-
- Address_Type: mailing and physical address
- Address: 4020 Technology Parkway
- City: Sheboygan
- State_or_Province: WI
- Postal_Code: 53083
- Country: USA
- Contact_Voice_Telephone: 1-920-457-3631
- Contact_Facsimile_Telephone: 1-920-457-0410
- Contact_Electronic_Mail_Address: cguy@quantumspatial.com
- Hours_of_Service: 8:00 am to 5:00 pm Central Standard Time
- Data_Set_Credit: Quantum Spatial, Inc.
- Data_Quality_Information:
-
- Attribute_Accuracy:
-
- Attribute_Accuracy_Report:
-
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.
- Logical_Consistency_Report: None
- Completeness_Report: Complete
- Positional_Accuracy:
-
- Horizontal_Positional_Accuracy:
-
- Horizontal_Positional_Accuracy_Report:
-
All these data products were acquired at 1500 meters above mean terrain (AMT) and have a horizontal accuracy of 0.27 meters, with a nominal point spacing of 1.0 meters.
- Vertical_Positional_Accuracy:
-
- Vertical_Positional_Accuracy_Report:
-
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, Vertical Accuracy Reporting for LiDAR for all land cover categories. Five land cover categories are evaluated. Land Cover categories are the following: Open Terrain, Short Grass, Tall Grass, Brush, Forest.
Supplemental Vertical Accuracy (SVA) target value of the TIN is 1.19 ft at the 95th percentile as derived by the ASPRS Guidelines. Vertical Accuracy Report results for LiDAR data based on the 95th percentile error in all of the individual land cover categories follow:
- Quantitative_Vertical_Positional_Accuracy_Assessment:
-
- Vertical_Positional_Accuracy_Value: 5.1 cm (0.17 ft) RMSEz .
- Vertical_Positional_Accuracy_Explanation:
-
Tested RMSE of the Classified Points 5.1 cm (0.17 ft) in Open Terrain as tested against the TIN.
- Quantitative_Vertical_Positional_Accuracy_Assessment:
-
- Vertical_Positional_Accuracy_Value: 10.1 cm (0.33 ft) FVA.
- Vertical_Positional_Accuracy_Explanation:
-
Tested FVA of 10.1 cm (0.33 ft) at the 95% confidence level on 25 points in Open Terrain / Short Grass as tested against the TIN.
- Quantitative_Vertical_Positional_Accuracy_Assessment:
-
- Vertical_Positional_Accuracy_Value: 9.8 cm (0.32 ft).
- Vertical_Positional_Accuracy_Explanation:
-
Tested 9.8 cm (0.32 ft) SVA at the 95th Percentile on 198 points in Short Grass category against the TIN.
- Quantitative_Vertical_Positional_Accuracy_Assessment:
-
- Vertical_Positional_Accuracy_Value: 14.9 cm (0.49 ft).
- Vertical_Positional_Accuracy_Explanation:
-
Tested 14.9 cm (0.49 ft) SVA at the 95th Percentile on 73 points in Tall Grass category against the TIN.
- Quantitative_Vertical_Positional_Accuracy_Assessment:
-
- Vertical_Positional_Accuracy_Value: 13.1 cm (0.43 ft).
- Vertical_Positional_Accuracy_Explanation:
-
Tested 13.1 cm (0.43 ft) SVA at the 95th Percentile on 26 points in Brush category against the TIN.
- Quantitative_Vertical_Positional_Accuracy_Assessment:
-
- Vertical_Positional_Accuracy_Value: 13.7 cm (0.45 ft).
- Vertical_Positional_Accuracy_Explanation:
-
Tested 13.7 cm (0.45 ft) SVA at the 95th Percentile on 22 points in Forested category against the TIN.
- Quantitative_Vertical_Positional_Accuracy_Assessment:
-
- Vertical_Positional_Accuracy_Value: 8.8 cm (0.29 ft).
- Vertical_Positional_Accuracy_Explanation:
-
Tested 8.8 cm (0.29 ft) SVA at the 95th Percentile on 25 points in Open Terrain category against the TIN.
- Quantitative_Vertical_Positional_Accuracy_Assessment:
-
- Vertical_Positional_Accuracy_Value: 11.6 cm (0.38 ft).
- Vertical_Positional_Accuracy_Explanation:
-
Tested 11.6 cm (0.38 ft) CVA at the 95th Percentile on 344 points in all ground categories against the TIN.
- Lineage:
-
- Source_Information:
-
- Source_Citation:
-
- Citation_Information:
-
- Originator: Quantum Spatial, Inc. (formerly AeroMetric, Inc.)
- Publication_Date: 20091029
- Title: Lee County, Illinois LiDAR Acquisition
- Geospatial_Data_Presentation_Form: raster digital data
- Publication_Information:
-
- Publication_Place: Sheboygan, WI
- Publisher: Quantum Spatial, Inc.
- Other_Citation_Details: None
- Type_of_Source_Media: disc
- Source_Time_Period_of_Content:
-
- Time_Period_Information:
-
- Single_Date/Time:
-
- Calendar_Date: 20090320
- Source_Currentness_Reference: ground condition
- Source_Citation_Abbreviation: Quantum_LiDAR_Acqui_Proc
- Source_Contribution:
-
This data source consists of LiDAR airborne acquisition, calibrated and classified, LAS version 1.1, and hydro breaklines.
- Source_Information:
-
- Source_Citation:
-
- Citation_Information:
-
- Originator: Quantum Spatial, Inc.
- Publication_Date: 20140502
- Title: Illinois Twelve Counties LiDAR Processing, 1130113
- Geospatial_Data_Presentation_Form: remote sensing data
- Publication_Information:
-
- Publication_Place: Sheboygan, WI
- Publisher: Quantum Spatial, Inc.
- Other_Citation_Details: None
- Type_of_Source_Media: disc
- Source_Time_Period_of_Content:
-
- Time_Period_Information:
-
- Single_Date/Time:
-
- Calendar_Date: 20090320
- Source_Currentness_Reference: ground condition
- Source_Citation_Abbreviation: Quantum_LiDAR_Reproc
- Source_Contribution:
-
This data source consists of LiDAR update, reclassification, LAS version 1.2, Digital Elevation Models (DEM) and hydro breaklines.
- Process_Step:
-
- Process_Description:
-
The LiDAR data is 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 Gemini
2. Flight Height - 1500 m above mean terrain
3. Swath Width - 32 degrees
4. Sidelap - 60%
5. Nominal Post Spacing - 1.0 m.
GPS and IMU processing parameters:
1. Processing Programs and version - Applanix - POSGPS and POSProc, versions 4.4
2. Maximum baseline length - Not greater than 30 km
3. Number of base stations during LiDAR collection - A minimum of 2 with a maximum of 4 stations were occupied during any of the lifts to acquire the LiDAR data. The following were the occupied base stations: LEE26 2B, LEE26 4B, LEE30 2A, OGL38 1B, OGL64 1B, OGL72 1B, OGL72 3B, WHI2192 1B, WHI96 1B.
4. Max separation between base stations during LiDAR collection - 0.12 m
5. IMU processing monitored for consistency and smoothness - Yes
Point Cloud Processing:
1. Program and version - Dashmap, version 4.0027
2. Horizontal Datum - NAD83(NSRS2007)
3. Horizontal Coordinates - Illinois State Plane Coordinate System, 1202, West 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 009.004), TerraModeler (version 009.001 and TerraMatch (version 009.001) 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. ILDOT captured QA/QC points in multiple land cover categories that were used to test the accuracy of the LiDAR ground surface. 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. A final OCR was performed with a resulting RMSE of 0.19 feet.
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.
- Source_Used_Citation_Abbreviation: Quantum_LiDAR_Acqui_Proc
- Process_Date: 20091029
- Process_Contact:
-
- Contact_Information:
-
- Contact_Organization_Primary:
-
- Contact_Organization: Quantum Spatial, Inc.
- Contact_Person: LiDAR Manager
- Contact_Address:
-
- Address_Type: 4020 Technology Parkway
- City: Sheboygan
- State_or_Province: WI
- Postal_Code: 53083
- Country: USA
- Contact_Voice_Telephone: 1-920-457-3631
- Contact_Facsimile_Telephone: 1-920-457-0410
- Contact_Electronic_Mail_Address: cguy@quantumspatial.com
- Hours_of_Service: Monday through Friday 8:00 AM to 5:00 PM (Central Time)
- Process_Step:
-
- Process_Description:
-
LiDAR data acquired and processed in 2009 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.
- Source_Used_Citation_Abbreviation: Quantum_LiDAR_Reproc
- Process_Date: 201312
- Process_Contact:
-
- Contact_Information:
-
- Contact_Organization_Primary:
-
- Contact_Organization: Quantum Spatial, Inc.
- Contact_Person: LiDAR Manager
- Contact_Address:
-
- Address_Type: 4020 Technology Parkway
- City: Sheboygan
- State_or_Province: WI
- Postal_Code: 53083
- Country: USA
- Contact_Voice_Telephone: 1-920-457-3631
- Contact_Facsimile_Telephone: 1-920-457-0410
- Contact_Electronic_Mail_Address: cguy@quantumspatial.com
- Hours_of_Service: Monday through Friday 8:00 AM to 5:00 PM (Central Time)
- Cloud_Cover: Unknown
- Spatial_Data_Organization_Information:
-
- Direct_Spatial_Reference_Method: Point
- 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: 1202 Illinois State Plane West
- Transverse_Mercator:
-
- Scale_Factor_at_Central_Meridian: .999941176
- Longitude_of_Central_Meridian: -90.16666667
- Latitude_of_Projection_Origin: 36.6666667
- False_Easting: 2296583.333
- 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: 6378137.000000
- Denominator_of_Flattening_Ratio: 298.25722210088
- Vertical_Coordinate_System_Definition:
-
- Altitude_System_Definition:
-
- Altitude_Datum_Name: North American Vertical Datum of 1988
- Altitude_Resolution: 0.01
- Altitude_Distance_Units: survey feet
- Altitude_Encoding_Method:
-
Explicit elevation coordinate included with horizontal coordinates
- Metadata_Reference_Information:
-
- Metadata_Date: 20140502
- Metadata_Contact:
-
- Contact_Information:
-
- Contact_Organization_Primary:
-
- Contact_Organization: Quantum Spatial, Inc.
- Contact_Address:
-
- Address_Type: Mailing and physical address
- Address: 4020 Technology Parkway
- City: Sheboygan
- State_or_Province: WI
- Postal_Code: 53083
- Country: US
- Contact_Voice_Telephone: 1-920-457-3631
- Contact_Facsimile_Telephone: 1-920-457-0410
- Contact_Electronic_Mail_Address: cguy@quantumspatial.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
Generated by mp version 2.9.12 on Wed May 21 12:39:40 2014