LiDAR_VTrans_TSIrene_2012

Metadata:

• Identification_Information
• Point_of_Contact
• Data_Set_Credit
• Security_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: Fugro EarthData, Inc.

Publication_Date: 20120709

Title: LiDAR_VTrans_TSIrene_2012

Edition: 2012

Geospatial_Data_Presentation_Form: map

Publication_Information:

Publication_Place: Montpelier VT 05633-5001

Publisher: Vermont Agency of Transportation

Other_Citation_Details: Tile Structure - LiDAR

Online_Linkage: N/A

Description:

Abstract:

This metadata record describes the acquisition and production of LiDAR covering seven sections of highway corridors in the State of Vermont for the Vermont Agency of Transportation (VTrans). LiDAR terrain points were generated with a minimum density of 2- 4 points per square meter (ppsm).

Purpose:

The State of Vermont, through VTrans required the acquisition of high resolution orthophotography and LiDAR for specific highway corridors damaged during Tropical Storm Irene on August 27-28, 2011. The orthophotography and terrain data will be utilized in the planning and design of infrastructure repairs.

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 20120418

Currentness_Reference: ground condition

Status:

Progress: Complete

Maintenance_and_Update_Frequency: Irregular

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -72.987407

East_Bounding_Coordinate: -72.378146

North_Bounding_Coordinate: 44.140488

South_Bounding_Coordinate: 42.843345

Keywords:

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category

Theme_Keyword: LiDAR

Theme_Keyword: Terrain

Theme_Keyword: Bare-Earth

Theme_Keyword: Aerial Acquisition

Theme_Keyword: FLI-MAP

Place:

Place_Keyword_Thesaurus: Geographic Names Information System

Place_Keyword: USA

Place_Keyword: Vermont

Place_Keyword: None

Access_Constraints: None

Use_Constraints:

VTrans and the State of VT make no representations of any kind, including but not limited to the warranties of merchantability or fitness for a particular use, nor are any such warranties to be implied with respect to the data. For all products, services, Internet Website, and data, excepting digital or hardcopy orthophotography collected through the VT Tax Department's Mapping Program, the direct, non-value added, reproduction of State of Vermont or VCGI's products, services, Website, or data with intent to sell is prohibited without the written consent of VCGI. For all digital or hardcopy orthophotography collected through the VT Tax Department's Mapping Program, copying, reprinting, duplicating, selling or attempting to sell is prohibited. Vermont Statute 32 V.S.A. § 3409 permits a fine, not to exceed $1,000.00, for any person violating this prohibition.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: VT Center for Geographic Information

Contact_Address:

Address_Type: Mailing and Physical Address

Address: 58 South Main Street, Suite 2

City: Waterbury

State_or_Province: VT

Postal_Code: 05676

Country: USA

Contact_Voice_Telephone:

Contact_TDD/TTY_Telephone: None

Contact_Facsimile_Telephone:

Contact_Electronic_Mail_Address: info@vcgi.org

Hours_of_Service: 9am - 5pm, M-F

Data_Set_Credit: Vermont Agency of Transportation (VTrans)

Security_Information:

Security_Classification_System: N/A

Security_Classification: Unclassified

Security_Handling_Description: N/A

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

This data has been produced to have a vertical accuracy that meets or exceeds a verified ASPRS Class I vertical accuracy of +/- 9.25 cm RMSE and 18.2 cm at 95% confidence level according to the NSSDA standard methodology.

Logical_Consistency_Report:

Compliance with the accuracy standard was ensured by the collection of ground control and the establishment of a GPS base station. The following checks were performed: 1) The LiDAR data accuracy was validated by performing a full boresight adjustment and then checking it against the ground control prior to generating a digital terrain model (DTM) or other products. 2) LiDAR elevation data was validated through an inspection of edge matching and visual inspection for quality (artifact removal).

Completeness_Report:

The following methods are used to ensure LiDAR data accuracy: 1) Use of a ground control network utilizing GPS survey techniques; 2) Use of airborne GPS and IMU in conjunction with the acquisition of LiDAR; and 3) Measurement of quality control ground survey points within the finished product. The following software is used for the validation: 1) Terrascan and 2) Fugro EarthData, Inc. Proprietary Software.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

This data has been produced to have a horizontal accuracy meeting ASPRS Class I horizontal accuracy for 1:600.

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

This data has been produced to have a vertical accuracy that meets or exceeds a verified ASPRS Class I vertical accuracy of +/- 9.25 cm RMSE and 18.2 cm at 95% confidence level according to the NSSDA standard methodology.

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator: Vermont Agency of Transportation (VTrans)

Publication_Date: 20120515

Title: GPS Survey for photo control

Geospatial_Data_Presentation_Form: model

Type_of_Source_Media: onLine

Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20120419

Ending_Date: 20120515

Source_Currentness_Reference: Publication Date

Source_Citation_Abbreviation: Ground Control

Source_Contribution:

VTrans successfully established ground control for the project area. A total of 31 ground control points were acquired using GPS for both vertical and horizontal coordinate values.

Source_Information:

Source_Citation:

Citation_Information:

Originator: Fugro EarthData, Inc.

Publication_Date: 20120418

Title: VTrans LiDAR; FLI-MAP Aerial Acquisition

Type_of_Source_Media: External hard drive

Source_Time_Period_of_Content:

Time_Period_Information:

Multiple_Dates/Times:

Single_Date/Time:

Calendar_Date: 20120407

Single_Date/Time:

Calendar_Date: 20120413

Single_Date/Time:

Calendar_Date: 20120414

Single_Date/Time:

Calendar_Date: 20120415

Single_Date/Time:

Calendar_Date: 20120416

Single_Date/Time:

Calendar_Date: 20120417

Single_Date/Time:

Calendar_Date: 20120418

Source_Currentness_Reference: ground condition

Source_Citation_Abbreviation: Aerial Acquisition

Source_Contribution:

Fugro EarthData, Inc. collected FLI-MAP derived LiDAR over the following Vermont corridors: VT-100 (north) from US-4 intersection in Killington to Rochester Village, VT-100 (south) from Plymouth to US-4 intersection in West Bridgewater, VT-9 Marlboro to Brattleboro, VT-12A Randolph to Northfield, VT-11 Andover to Chester, US-4 Rutland City to Hartford, and VT-107 Stockbridge to Bethel; with a minimum of 2- 4 points per square meter (ppsm). The collection for the entire project was accomplished on April 7, 13, 14, 15, 16, 17, and 18, 2012; 178 flight lines were acquired in 9 lifts.

Process_Step:

Process_Description:

All acquired LiDAR data went through a preliminary review to assure that complete coverage was obtained and that there were no gaps between flight lines before the flight crew left the project site. Once back in the office, the data was run through a comprehensive quality check to ensure that it is complete, uncorrupted, and that the entire project area has been covered without gaps between flight lines. There are essentially three steps to this processing: 1) GPS/IMU Processing - Airborne GPS and IMU data was processed using the airport GPS base station data, which was available to the flight crew upon landing the plane. This ensured the integrity of all the mission data. These results were also used to perform the initial LiDAR system calibration test. 2) Raw LiDAR Data Processing - Technicians processed the raw data to LAS format flight lines with full resolution output before performing QC. A starting configuration file is used in this process, which contains the latest calibration parameters for the sensor. The technicians also generated flight line trajectories for each of the flight lines during this process. 3) Verification of Coverage and Data Quality - Technicians checked flight line trajectory files to ensure completeness of acquisition for project flight lines, calibration lines, and cross flight lines. The intensity images were generated for the entire lift. The technician visually checked the intensity images against the acquisition boundary to ensure full coverage to the 500 meter buffer beyond the project boundary. The technician also thoroughly reviewed the data for any gaps in project area. The technician generated a sample TIN surface to ensure no anomalies were present in the data. Turbulence was inspected for and if it affected the quality of the data, the flight line was rejected and reflown. The technician also evaluated the achieved post spacing against project specified post spacing.

Source_Used_Citation_Abbreviation: Raw LiDAR Data

Process_Date: 20120427

Source_Produced_Citation_Abbreviation: Verified LiDAR Data

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Fugro EarthData, Inc.

Contact_Person: Becky Jordan

Contact_Address:

Address_Type: mailing and physical

Address: 7320 Executive Way

City: Frederick

State_or_Province: MD

Postal_Code: 21704

Country: US

Contact_Voice_Telephone: (301) 948-8550

Contact_Facsimile_Telephone: (301) 963-2064

Contact_Electronic_Mail_Address: bjordan@fugro.com

Hours_of_Service: Monday to Friday 8:30am to 5:00pm EST

Process_Step:

Process_Description:

The boresight for each lift was done individually as the solution may change slightly from lift to lift. The following steps describe the Raw Data Processing and Boresight process: 1) Technician processed the raw data to LAS format flight lines using the final GPS/IMU solution. This LAS data set was used as source data for boresight. 2) Technician used Fugro proprietary and commercial software to calculate initial boresight adjustment angles based on sample areas selected in the lift. These areas cover calibration flight lines collected in the lift, cross tie and production flight lines. These areas are well distributed in the lift coverage and cover multiple terrain types that are necessary for boresight angle calculation. The technician then analyzed the result and made any necessary additional adjustment until it is acceptable for the mini project. 3) Once the boresight angle calculation is complete for the sample areas, the adjusted settings were applied to all of the flight lines of the lift and checked for consistency. The technician utilized commercial and proprietary software packages to analyze the matching between flight line overlaps for the entire lift to ensure that systematic errors were minimized for the lift and the results met the project specifications. 4) Once all lifts were completed with boresight adjustment individually, the technician checked and corrected the vertical misalignment of all flight lines and also the matching between data and ground truth. 5) The technician ran a final vertical accuracy check of the boresighted flight lines against the surveyed check points after the z correction. The result was analyzed against the project specified accuracy to make sure it meets the project requirements.

Source_Used_Citation_Abbreviation: Verified LiDAR Data

Process_Date: 20120531

Source_Produced_Citation_Abbreviation: Boresighted LiDAR Data

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Fugro EarthData, Inc.

Contact_Person: Becky Jordan

Contact_Address:

Address_Type: mailing and physical

Address: 7320 Executive Way

City: Frederick

State_or_Province: MD

Postal_Code: 21704

Country: US

Contact_Voice_Telephone: (301) 948-8550

Contact_Facsimile_Telephone: (301) 963-2064

Contact_Electronic_Mail_Address: bjordan@fugro.com

Hours_of_Service: Monday to Friday 8:30am to 5:00pm EST

Process_Step:

Process_Description:

Once boresighting is complete for the project, the project was set up for automatic classification first. The LiDAR data was cut to production tiles. The flight line overlap points, Noise points and Ground points were classified automatically in this process. Fugro EarthData, Inc. has developed a unique method for processing LiDAR data to identify and re-classify elevation points falling on vegetation, building, and other above ground structures into separate data layers. The steps are as follows: 1) Fugro EarthData, Inc. utilized commercial software as well as proprietary software for automatic filtering. The parameters used in the process were customized for each terrain type to obtain optimum results. 2) Once the automated filtering was completed, the files were run through a visual inspection to ensure that the filtering was not too aggressive or not aggressive enough. In cases where the filtering was too aggressive and important terrain features were filtered out, the data was either run through a different filter within local area or was corrected during the manual filtering process. 3) Interactive editing was completed in visualization software that provides manual and automatic point classification tools. Fugro EarthData, Inc. utilized commercial and proprietary software for this process. Vegetation and artifacts remaining after automatic data post-processing were reclassified manually through interactive editing. The hard edges of ground features that were automatically filtered out during the automatic filtering process were brought back into ground class during manual editing. The technician reviewed the LiDAR points with color shaded TINs for anomalies in ground class during interactive filtering. 4) All LAS tiles went through peer review after the first round of interactive editing was finished. This helps to catch misclassification that may have been missed by the interactive editing. 5) Upon the completion of the manual editing and peer review, and finalization of bare earth filtering, all tiles went through another final automated classification routine. This process ensures only the required classifications are used in the final product (all points classified into any temporary classes during manual editing were re-classified into the project specified classifications). 6) Once manual inspection, QC, and final autofilter is complete for the LiDAR tiles, the LAS data was packaged to the project specified tiling scheme, clipped to the project boundary and LAS delivery format. It was also reprojected to Vermont State Plane, FIPS4400; NAD83 (CORS96), meters; NAVD88 (GEOID09), meters. The file header was formatted to meet project specification with File Source ID assigned. This Classified Point Cloud product was used for the generation of derived products. This product was delivered in fully compliant LAS v1.2, Point Record Format 1 with Adjusted Standard GPS Time. Georeference information was included in all LAS file headers. Intensity values and point color were included for each point. Each tile has a unique File Source ID assigned. The Point Source ID matches to the flight line ID in flight trajectory files. The following classification was included: Category 1 Unclassified and Category 2 Ground/Bare Earth.

Source_Used_Citation_Abbreviation: Boresighted LiDAR Data

Process_Date: 20120709

Source_Produced_Citation_Abbreviation: Classified LiDAR Point Cloud Data

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Fugro EarthData, Inc.

Contact_Person: Becky Jordan

Contact_Address:

Address_Type: mailing and physical

Address: 7320 Executive Way

City: Frederick

State_or_Province: MD

Postal_Code: 21704

Country: US

Contact_Voice_Telephone: (301) 948-8550

Contact_Facsimile_Telephone: (301) 963-2064

Contact_Electronic_Mail_Address: bjordan@fugro.com

Hours_of_Service: Monday to Friday 8:30am to 5:00pm EST

Process_Step:

Process_Description: Made RAW data available from data delivery to VTRANS

Process_Date: 20130311

Process_Time: Unknown

Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Mike Brouillette

Contact_Organization: VCGI

Contact_Position: Snr GIS Prj Manager

Cloud_Cover: 0

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Point

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: 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: FIPS 4400

Transverse_Mercator:

Scale_Factor_at_Central_Meridian: 0.999964

Longitude_of_Central_Meridian: -72.500000

Latitude_of_Projection_Origin: 42.500000

False_Easting: 500000.000000

False_Northing: 0.000000

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair

Coordinate_Representation:

Abscissa_Resolution: 1

Ordinate_Resolution: 1

Planar_Distance_Units: Meters

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1983 (NAD83, CORS96)

Ellipsoid_Name: Geodetic Reference System 80

Semi-major_Axis: 6378137.000000

Denominator_of_Flattening_Ratio: 298.257222

Vertical_Coordinate_System_Definition:

Altitude_System_Definition:

Altitude_Datum_Name: North American Vertical Datum of 1988

Altitude_Resolution: 1

Altitude_Distance_Units: Meters

Altitude_Encoding_Method:

Explicit elevation coordinate included with horizontal coordinates

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: VT Center for Geographic Information

Contact_Address:

Address_Type: mailing and physical

Address: 58 South Main Street, Suite 2

City: Waterbury

State_or_Province: Vermont

Postal_Code: 05676

Country: UNITED STATES

Contact_Voice_Telephone: (802) 882-3000

Contact_Facsimile_Telephone: (802) 882-3001

Contact_Electronic_Mail_Address: info@vcgi.org

Hours_of_Service: 9am - 5pm, M-F

Distribution_Liability:

VCGI, VTrans and the State of VT make no representations of any kind, including but not limited to the warranties of merchantability or fitness for a particular use, nor are any such warranties to be implied with respect to the data.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: GeoTIFF, ASCII, and LAS

Format_Version_Number: Unknown

Format_Specification: GeoTIFF, ASCII, and LAS

Format_Information_Content: geospatial data

Digital_Transfer_Option:

Offline_Option:

Offline_Media: 1-2Tb external drive

Recording_Format: N/A

Fees: Contact Distributor

Ordering_Instructions: Contact Distributor

Turnaround: Undetermined

Metadata_Reference_Information:

Metadata_Date: 20121211

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Fugro EarthData, Inc.

Contact_Person: Becky Jordan

Contact_Address:

Address_Type: mailing and physical

Address: 7320 Executive Way

City: Frederick

State_or_Province: MD

Postal_Code: 21704

Country: US

Contact_Voice_Telephone: (301) 948-8550

Contact_Facsimile_Telephone: (301) 963-2064

Contact_Electronic_Mail_Address: bjordan@fugro.com

Hours_of_Service: Monday to Friday 8:30am to 5:00pm EST

Metadata_Date: 20130311

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: VT Center for Geographic Information

Contact_Person: GIS Database Administrator

Contact_Address:

Address_Type: Mailing and Physical Address

Address: 58 South Main Street, Suite 2

City: Waterbury

State_or_Province: VT

Postal_Code: 05676

Country: USA

Contact_Voice_Telephone:

Contact_TDD/TTY_Telephone: None

Contact_Facsimile_Telephone:

Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: local time