CITY OF ROCKS NATIONAL MONUMENT ID 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: 20110830

Title: CITY OF ROCKS NATIONAL MONUMENT ID LiDAR TASK ORDER

Geospatial_Data_Presentation_Form: remote-sensing image

Description:

Abstract:

This task order is for planning, acquisition, processing, and derivative products of LiDAR data to be collected for the City of Rocks National Monument in Idaho. Contract number G10PC00025, Task Order G11PD00294. USGS has a requirement for LiDAR data over the City of Rocks National Monument in Idaho, covering approximately 81 square miles.

Purpose:

The City of Rocks National Monument ID LiDAR Acquisition project is to provide high accuracy bare-earth processed LiDAR data suitable for the project area. The City of Rocks National Monument is to be collected at a nominal pulse spacing (NPS) of 1.0 meter. Specifications listed below are based on the US Geological Survey National Geospatial Program Base Lidar Specification, Version 13. LiDAR cloud data was collected with up to 4 returns per pulse. Tiled data was generated using a 1500 meter by 1500 meter grid format and all points classified per ASPRS to classes 1,2,7,9 and 10. Classes 9 and 10 were not required in the processing of this project area as no water bodies were found meeting the minimum 2 acre capture requirement, nor were there any streams or rivers meeting the 100 foot wide hydro-enforcement criteria. In addition there were no overpass or overhanging structures which prevented adequate LiDAR ground returns beneath them where breaklines might need to be placed. Raw swath data shall be delivered in a per swath format not to exceed 2Gb per swath file size with points classified to class 0. All LiDAR returns will be set to absolute GPS time with each file containing LAS file header information. The project consisted of acquisition, post-processing, and classification of LiDAR data. The classified bare-earth data achieved the following: All areas shall be collected at a nominal pulse spacing (NPS) of 1.0 meter based on UTM11, related to the North American Datum of 1983 (NSRS2007). Vertical accuracy was to achieve a RMSE Z of 12.5cm (95% confidence level of less than 24.5cm) or better in the "Open Terrain" land cover category for all areas.
Accuracy statement is based on the 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 the vertical accuracy or better, 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.

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 20110624

Currentness_Reference: ground condition

Status:

Progress: Complete

Maintenance_and_Update_Frequency: unknown

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -113.769

East_Bounding_Coordinate: -113.625

North_Bounding_Coordinate: 42.159

South_Bounding_Coordinate: 41.987

Keywords:

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: City of Rocks National Monument ID

Theme_Keyword: Light Detection and Ranging

Theme_Keyword: LiDAR

Theme_Keyword: LAS

Place:

Place_Keyword_Thesaurus: None

Place_Keyword: US

Place_Keyword: State

Place_Keyword: Idaho

Access_Constraints: None.

Use_Constraints: None.

Data_Set_Credit: AeroMetric, Inc.

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Robert Kelly

Contact_Organization: USGS

Contact_Position: MS 665

Contact_Voice_Telephone: 573-308-3612

Contact_TDD/TTY_Telephone: unknown

Contact_Facsimile_Telephone: 573-308-3810

Contact_Electronic_Mail_Address: ckelly@usgs.gov

Hours_of_Service: 8 am - 5 pm CST

Contact_Instructions: none

Contact_Address:

Address_Type: mailing and physical address

Address: 1400 Independence Road

City: Rolla

State_or_Province: MO

Postal_Code: 65401

Country: USA

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

The Fundamental Vertical Accuracy (FVA) of the Classified Bare Earth files for the project area achieved an RMSE of 0.085 meters. Ten (10) control points were used by AeroMetric for this evaluation. An additional 60 points were held in reserve and supplied to USGS for their internal verification.

Logical_Consistency_Report: None

Completeness_Report: Complete

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

The LiDAR data was acquired at or below 1800 meters above ground level (AGL) and has a horizontal accuracy of 0.33 meters (per manufacturers system specifications), with a nominal point spacing of 1.0 meter.

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

The Fundamental Vertical Accuracy (FVA) of the Classified Bare Earth for the area achieved 16.7cm at a 95% confidence level in the "Open Terrain" land cover category. Ten (10) control points were used by AeroMetric in this evaluation. The FVA accuracy requirement for Open Terrain was 24.5cm at a 95% confidence level which was easily met. An additional sixty (60) survey control points were observed in three major land cover categories, however, these points were not incorporated but passed on to USGS for their evaluation and acceptance. Final acceptance is that the provided blind points will meet a consolidated vertical accuracy of 36.3cm at a 95th percentile error.

Lineage:

Process_Step:

Process_Description:

The LiDAR data was captured using Keystone Aerial Survey's twin-engine Cessna 310, fixed wing aircraft equipped with a LiDAR system. The LiDAR system includes a differential GPS unit and inertial measurement system to provide superior accuracy.
Acquisition parameters: 1. Scanner - Optech Gemini serial number 08SEN236 2. Flight Height - 1800 meters above ground level 3. Swath Angle - 24 degrees 4. Sidelap - 65% 5. Nominal Post Spacing - 0.95m 6. Distance between flightlines - 222 meters
GPS and IMU processing parameters: 1. Processing Programs and version - Applanix - POSGPS and POSProc, versions 4.4, MMS version 5.2 2. Maximum baseline length - Not greater than 55km. 3. Number of base stations during LiDAR collection - A minimum of 1. 4. Max separation between base station during LiDAR collection - 0.05m 5. IMU processing monitored for consistency and smoothness - Yes.
Point Cloud Processing: 1. Program and version - Optech Dashmap version 5.20 2. Horizontal Datum - NAD83(NSRS2007) 3. Horizontal Coordinates - Universal Transverse Mercator, Zone 11, in Meters. 4. Vertical Datum - NAVD88 5. Geoid Model used to reduce satellite derived elevations to orthometric heights - NGS Geoid09.
LiDAR Processing: 1. Processing Programs and versions - Optech Dashmap (version 5.20), TerraSolid TerraScan (version 011.005), TerraModeler (version 011.001) and TerraMatch (version 011.004) and Intergraph MicroStation (version.08.05.02.70). 2. Point Cloud data is imported to TerraScan in a Microstation V8 (V) CAD environment on a client specified 1500 meter by 1500 meter 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 as needed 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. AeroMetric, Inc. provided Quality Assurance and Quality Control (QA/QC) data for this project. AeroMetric collected ten (10) 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 survey data to the LiDAR ground surface. This routine searches the LiDAR dataset by X and Y coordinate, finds the closest LiDAR points and compares the vertical (Z) values to the known data collected in the field. The final OCR resulted in an RMSE of 0.085m for the project. 8. Each tile is reviewed for accuracy and consistency of the macro ground classification. During this phase, MicroStation is generally used to generate line work representing water bodies and rivers and separate line work is placed in instances where overpasses or overhangs have blocked enough ground returns or water gave too few ground returns to reasonably portray the ground surface. This project area had no features meeting the collection criteria for hydro or breakline enforcement so no additional line work was created. 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 an internal Quality Control process. 10. Final deliverables are generated and output to a client specified 1500m by 1500m tiling scheme, LiDAR point data files are saved as LAS Version 1.2. 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. The DEM generation for this project used only LiDAR bare-earth points as no hydro or breakline features were captured based upon the collection criteria.

Process_Date: 20110831

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: 11

Transverse_Mercator:

Scale_Factor_at_Central_Meridian: 0.9996

Longitude_of_Central_Meridian: -117

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: 6378137.000000

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: meters

Altitude_Encoding_Method:

Explicit elevation coordinate included with horizontal coordinates

Metadata_Reference_Information:

Metadata_Date: 20110906

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: rmerry@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