Illinois Twelve Counties LiDAR Processing, Lee County, Illinois,
Digital Elevation Model USGS Contract G10PC0025, Task order
G13PD00753
Metadata also available as
Metadata:
- Identification_Information:
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Citation:
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Citation_Information:
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Originator: Quantum Spatial, Inc. (formerly AeroMetric,
Inc.)
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Publication_Date: 20140502
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Title:
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Illinois Twelve Counties LiDAR Processing, Lee County, Illinois,
Digital Elevation Model USGS Contract G10PC0025, Task order
G13PD00753
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Geospatial_Data_Presentation_Form: remote-sensing image
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Description:
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Abstract:
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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.
Abstract Addendum, USGS National Geospatial Technical Operations Center (NGTOC), data edited July 2015: Data may have been modified from the original, delivered data by the NGTOC to correct issues such as breakline enforcement and hydro-flattening of water bodies, pits and spikes, and to remove edge tinning and other anomalies. End Abstract Addendum.
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Purpose:
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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.
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Time_Period_of_Content:
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Time_Period_Information:
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Single_Date/Time:
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Calendar_Date: 20090320
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Currentness_Reference: ground condition
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Status:
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Progress: Complete
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Maintenance_and_Update_Frequency: unknown
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Spatial_Domain:
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Bounding_Coordinates:
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West_Bounding_Coordinate: -89.635
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East_Bounding_Coordinate: -88.932
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North_Bounding_Coordinate: 41.914
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South_Bounding_Coordinate: 41.585
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Keywords:
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Theme:
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Theme_Keyword_Thesaurus: None
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Theme_Keyword: Elevation data
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Theme_Keyword: Light Detection and Ranging
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Theme_Keyword:
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LIDAR
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Theme_Keyword: Bare Earth
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Theme_Keyword: Point Cloud
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Theme_Keyword: Breakline
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Theme_Keyword: DEM
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Theme_Keyword: LAS
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Place:
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Place_Keyword_Thesaurus: None
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Place_Keyword: US
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Place_Keyword: Illinois
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Place_Keyword: Dixon
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Place_Keyword: Lee County
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Access_Constraints: None
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Use_Constraints:
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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.
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Point_of_Contact:
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Contact_Information:
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Contact_Organization_Primary:
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Contact_Organization: Quantum Spatial, Inc.
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Contact_Person: LiDAR Manager
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Contact_Position: LiDAR Manager
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Contact_Address:
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Address_Type: mailing and physical address
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Address: 4020 Technology Parkway
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City: Sheboygan
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State_or_Province: WI
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Postal_Code: 53083
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Country: USA
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Contact_Voice_Telephone: 1-920-457-3631
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Contact_Facsimile_Telephone: 1-920-457-0410
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Contact_Electronic_Mail_Address: cguy@quantumspatial.com
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Hours_of_Service: 8:00 am to 5:00 pm Central Standard
Time
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Data_Set_Credit: Quantum Spatial, Inc.
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Data_Quality_Information:
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Attribute_Accuracy:
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Attribute_Accuracy_Report:
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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.
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Logical_Consistency_Report: None
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Completeness_Report: Complete
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Positional_Accuracy:
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Horizontal_Positional_Accuracy:
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Horizontal_Positional_Accuracy_Report:
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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.
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Vertical_Positional_Accuracy:
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Vertical_Positional_Accuracy_Report:
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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:
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Quantitative_Vertical_Positional_Accuracy_Assessment:
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Vertical_Positional_Accuracy_Value: 5.1 cm (0.17 ft)
RMSEz .
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Vertical_Positional_Accuracy_Explanation:
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Tested RMSE of the Classified Points 5.1 cm (0.17 ft) in Open
Terrain as tested against the TIN.
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Quantitative_Vertical_Positional_Accuracy_Assessment:
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Vertical_Positional_Accuracy_Value: 10.1 cm (0.33 ft)
FVA.
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Vertical_Positional_Accuracy_Explanation:
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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.
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Quantitative_Vertical_Positional_Accuracy_Assessment:
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Vertical_Positional_Accuracy_Value: 9.8 cm (0.32 ft).
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Vertical_Positional_Accuracy_Explanation:
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Tested 9.8 cm (0.32 ft) SVA at the 95th Percentile on 198 points
in Short Grass category against the TIN.
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Quantitative_Vertical_Positional_Accuracy_Assessment:
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Vertical_Positional_Accuracy_Value: 14.9 cm (0.49 ft).
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Vertical_Positional_Accuracy_Explanation:
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Tested 14.9 cm (0.49 ft) SVA at the 95th Percentile on 73 points
in Tall Grass category against the TIN.
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Quantitative_Vertical_Positional_Accuracy_Assessment:
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Vertical_Positional_Accuracy_Value: 13.1 cm (0.43 ft).
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Vertical_Positional_Accuracy_Explanation:
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Tested 13.1 cm (0.43 ft) SVA at the 95th Percentile on 26 points
in Brush category against the TIN.
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Quantitative_Vertical_Positional_Accuracy_Assessment:
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Vertical_Positional_Accuracy_Value: 13.7 cm (0.45 ft).
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Vertical_Positional_Accuracy_Explanation:
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Tested 13.7 cm (0.45 ft) SVA at the 95th Percentile on 22 points
in Forested category against the TIN.
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Quantitative_Vertical_Positional_Accuracy_Assessment:
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Vertical_Positional_Accuracy_Value: 8.8 cm (0.29 ft).
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Vertical_Positional_Accuracy_Explanation:
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Tested 8.8 cm (0.29 ft) SVA at the 95th Percentile on 25 points
in Open Terrain category against the TIN.
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Quantitative_Vertical_Positional_Accuracy_Assessment:
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Vertical_Positional_Accuracy_Value: 11.6 cm (0.38 ft).
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Vertical_Positional_Accuracy_Explanation:
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Tested 11.6 cm (0.38 ft) CVA at the 95th Percentile on 344
points in all ground categories against the TIN.
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Lineage:
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Source_Information:
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Source_Citation:
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Citation_Information:
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Originator: Quantum Spatial, Inc. (formerly
AeroMetric, Inc.)
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Publication_Date: 20091029
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Title: Lee County, Illinois LiDAR Acquisition
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Geospatial_Data_Presentation_Form: raster digital data
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Publication_Information:
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Publication_Place: Sheboygan, WI
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Publisher: Quantum Spatial, Inc.
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Other_Citation_Details: None
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Type_of_Source_Media: disc
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Source_Time_Period_of_Content:
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Time_Period_Information:
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Single_Date/Time:
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Calendar_Date: 20090320
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Source_Currentness_Reference: ground condition
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Source_Citation_Abbreviation: Quantum_LiDAR_Acqui_Proc
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Source_Contribution:
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This data source consists of LiDAR airborne acquisition,
calibrated and classified, LAS version 1.1, and hydro breaklines.
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Source_Information:
-
Source_Citation:
-
Citation_Information:
-
Originator: Quantum Spatial, Inc.
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Publication_Date: 20140502
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Title: Illinois Twelve Counties LiDAR Processing,
1130113
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Geospatial_Data_Presentation_Form: remote sensing data
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Publication_Information:
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Publication_Place: Sheboygan, WI
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Publisher: Quantum Spatial, Inc.
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Other_Citation_Details: None
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Type_of_Source_Media: disc
-
Source_Time_Period_of_Content:
-
Time_Period_Information:
-
Single_Date/Time:
-
Calendar_Date: 20090320
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Source_Currentness_Reference: ground condition
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Source_Citation_Abbreviation: Quantum_LiDAR_Reproc
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Source_Contribution:
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This data source consists of LiDAR update, reclassification, LAS
version 1.2, Digital Elevation Models (DEM) and hydro breaklines.
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Process_Step:
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Process_Description:
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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.
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Source_Used_Citation_Abbreviation:
Quantum_LiDAR_Acqui_Proc
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Process_Date: 20091029
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Process_Contact:
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Contact_Information:
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Contact_Organization_Primary:
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Contact_Organization: Quantum Spatial, Inc.
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Contact_Person: LiDAR Manager
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Contact_Address:
-
Address_Type: 4020 Technology Parkway
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City: Sheboygan
-
State_or_Province: WI
-
Postal_Code: 53083
-
Country: USA
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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)
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Process_Step:
-
Process_Description:
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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. 3. Bare earth DEM files are generated
from classified LAS data and output as hydro flattened models
according to the tile layout scheme. 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 and with hyrdo Breaklines in place to delineate surface
water. 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.
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Source_Used_Citation_Abbreviation: Quantum_LiDAR_Reproc
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Process_Date: 201312
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Process_Contact:
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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)
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Cloud_Cover: Unknown
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Spatial_Data_Organization_Information:
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Direct_Spatial_Reference_Method: Point
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Spatial_Reference_Information:
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Horizontal_Coordinate_System_Definition:
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Planar:
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Grid_Coordinate_System:
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Grid_Coordinate_System_Name: State Plane Coordinate
System 1983
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State_Plane_Coordinate_System:
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SPCS_Zone_Identifier: 1202 Illinois State Plane West
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Transverse_Mercator:
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Scale_Factor_at_Central_Meridian: .999941176
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Longitude_of_Central_Meridian: -90.16666667
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Latitude_of_Projection_Origin: 36.6666667
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False_Easting: 2296583.333
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False_Northing: 0
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Planar_Coordinate_Information:
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Planar_Coordinate_Encoding_Method: coordinate pair
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Coordinate_Representation:
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Abscissa_Resolution: 3.2
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Ordinate_Resolution: 3.2
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Planar_Distance_Units: survey feet
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Geodetic_Model:
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Horizontal_Datum_Name: North American Datum of 1983
(HARN)
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Ellipsoid_Name: Geodetic Reference System 80
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Semi-major_Axis: 6378137.000000
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Denominator_of_Flattening_Ratio: 298.25722210088
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Vertical_Coordinate_System_Definition:
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Altitude_System_Definition:
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Altitude_Datum_Name: North American Vertical Datum of
1988
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Altitude_Resolution: 0.01
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Altitude_Distance_Units: survey feet
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Altitude_Encoding_Method:
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Explicit elevation coordinate included with horizontal
coordinates
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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 12:39:39 2014