San Luis Valley CO LiDAR TASK ORDER

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: AeroMetric, Inc.

Publication_Date: 20120718

Title: San Luis Valley CO LiDAR TASK ORDER

Geospatial_Data_Presentation_Form: remote-sensing image

Publication_Information:

Publication_Place: Sheboygan, WI

Publisher: AeroMetric

Description:

Abstract:

This task order is for planning, acquisition, processing, and derivative products of LiDAR data to be collected for San Luis Valley, Colorado. LiDAR data, and derivative products produced in compliance with this task order are part of the data to be obtained under Contract number G10PC00025, Order number G11PD01035. Specifications listed below are based on the U.S. Geological Survey National Geospatial Program Base LiDAR Specification, Version 13.

Purpose:

USGS has a requirement for LiDAR data over San Luis Valley, Colorado. Data is to be collected at a nominal pulse spacing (NPS) of 1.0 meters. The San Luis Valley LiDAR Acquisition project is to provide high accuracy bare-earth processed LiDAR data suitable for the project area. The project consisted of acquisition, post-processing, classification of LiDAR data, and creation of final deliverable products. All areas shall be collected at a nominal pulse spacing (NPS) of 1.0 meters based on UTM13, related to the North American Datum of 1983 (NSRS2007). Vertical accuracy was to achieve a RMSE Z of 12.5 cm (95% confidence level of less than 24.5 cm) or better in the "Open Terrain" land cover category for all areas. Accuracy statement is based on areas of moderate to flat terrain. Diminished accuracies are to be expected in areas in dense vegetation. The accuracy of the LiDAR data as tested met or exceeded the vertical accuracy requirements, however, derived products may be less accurate in areas of dense vegetation due to a lesser number of points defining the bare-earth in such areas. FEMA (Federal Emergency Management Agency) also has a need for some select areas within the project confines for 2 foot contours and DEM.

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 20110918

Currentness_Reference: ground condition

Status:

Progress: Complete

Maintenance_and_Update_Frequency: As needed

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -106.45500

East_Bounding_Coordinate: -105.26100

North_Bounding_Coordinate: 38.20400

South_Bounding_Coordinate: 36.96000

Keywords:

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: San Luis Valley

Theme_Keyword: Light Detection and Ranging

Theme_Keyword: LiDAR

Theme_Keyword: Breaklines

Theme_Keyword: Shapefiles

Theme_Keyword: Survey Control

Theme_Keyword: DEM

Theme_Keyword: Lift

Theme_Keyword: Intensity Raster

Theme_Keyword: LAS

Theme_Keyword: Swath

Theme_Keyword: Project

Theme_Keyword: Contours

Place:

Place_Keyword_Thesaurus: None

Place_Keyword: US

Place_Keyword: State

Place_Keyword: CO

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 U.S. Geological Survey would be appreciated for products derived from these data.

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Mike Duncan

Contact_Organization: USGS

Contact_Position: NGTOC

Contact_Address:

Address_Type: mailing and physical address

Address: 1400 Independence Road

City: Rolla

State_or_Province: MO

Postal_Code: 65401

Country: USA

Contact_Voice_Telephone: 573-308-3587

Contact_TDD/TTY_Telephone: unknown

Contact_Facsimile_Telephone: 573-308-3810

Contact_Electronic_Mail_Address: jduncan@usgs.gov

Hours_of_Service: unknown

Contact_Instructions: none

Data_Set_Credit: AeroMetric, Inc.

Native_Data_Set_Environment:

1. Scanner - Lieca ALS50II Serial SN53 Optech 3100 Serial 05SEN175 Optech Gemini Serial 05SEN201 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), Intergraph MicroStation (version 08.05.02.55), and GeoCue (version 2011.1.20.0). 5. Viewing Program - GlobalMapper V12.00

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

The Fundamental Vertical Accuracy (FVA) of the Classified Bare Earth files all achieved is 0.142 meters at a 95% confidence level with an RMSE of 0.073 meters. Twenty-two (22) 'open terrain' survey control points were used in this evaluation, with an additional 20 'open terrain' points held in reserve and supplied to the client. The Fundamental Vertical Accuracy (FVA) of the LAS Swath Data achieved a 0.12 meters at a 95% confidence level with an RMSE of 0.06 meters using the survey checkpoints verified against the TIN derived from the final controlled and calibrated swath data. The Supplemental Vertical Accuracy (SVA) results Tall Grass achieved 0.13 meters at the 95th Percentile, SVA checkpoints were assessed and reported against the derived DEM. The Supplemental Vertical Accuracy (SVA) results Brush achieved 0.21 meters at the 95th Percentile, SVA checkpoints were assessed and reported against the derived DEM. The Supplemental Vertical Accuracy (SVA) results Trees achieved 0.28 meters at the 95th Percentile, SVA checkpoints were assessed and reported against the derived DEM. The Supplemental Vertical Accuracy (SVA) results Urban achieved 0.165 meters at the 95th Percentile, SVA checkpoints were assessed and reported against the derived DEM. The Supplemental Vertical Accuracy (SVA) results Dunes achieved 0.20 meters at the 95th Percentile, SVA checkpoints were assessed and reported against the derived DEM. The Consolidated Vertical Accuracy (CVA) results for all Land Cover Classes combined achieved 0.22 meters at the 95th Percentile, CVA checkpoints were assessed and reported against the derived DEM.

Logical_Consistency_Report: None

Completeness_Report: Complete

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

Area data products collected with the Lieca ALS50II were acquired at or below 3000 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. Area data products collected with the Optech 3100 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. Area data products 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 Cessna 310, The Atlanta Group's twin-engine Piper PA-31-350, and Merrick's twin-engine Cessna 402C fixed wing aircrafts, all equipped with a LiDAR system. The LiDAR systems includes a differential GPS unit and inertial measurement system to provide superior accuracy.
Acquisition parameters: 1. Flight Height - 3000 meters or lower above mean terrain 2. Swath Width - 36 degrees 3. Sidelap - 30% 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 2. 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 - NAD83(NSRS2007) 2. Horizontal Coordinates - Universal Transverse Mercator, Zone 13, in Meters. 3. Vertical Datum - NAVD88 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 1500 meter by 1500 meter 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. 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). 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 coordinate, finds the closest LiDAR point and compares 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. A final OCR was performed with a resulting RMSE of 0.0727 meters for the project. 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 1500 meter by 1500 meter tiling scheme. 11. DEMs are generated using the finalized line work along with bare earth LiDAR points on a per tile basis in an ASCII format. These DEM are reviewed for adherence and completeness to the data and tile layout used during the creation process. Following acceptance, the files are converted using ArcMap to the delivered IMG format. 12. Intensity raster imagery is generated from the point cloud LAS data in a tiled format using GeoCue.

Process_Date: 20110918

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: Universal Transverse Mercator

Universal_Transverse_Mercator:

UTM_Zone_Number: 13

Transverse_Mercator:

Scale_Factor_at_Central_Meridian: 0.9996

Longitude_of_Central_Meridian: -105

Latitude_of_Projection_Origin: 0

False_Easting: 500000

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: meters

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1983 (NSRS 2007)

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: 0.01

Altitude_Distance_Units: meters

Altitude_Encoding_Method:

Explicit elevation coordinate included with horizontal coordinates

Metadata_Reference_Information:

Metadata_Date: 20120509

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