VTORTHO_0_16M_PAN_2004

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: EarthData International and Chittenden County MPO (CCMPO)

Publication_Date: 20050121

Publication_Time: unknown

Title: VTORTHO_0_16M_PAN_2004

Edition: 2004A

Geospatial_Data_Presentation_Form: raster digital data

Series_Information:

Series_Name: VT orthos (2004) - 1:1250 (0.16 meter) truecolor

Issue_Identification: 2004A

Publication_Information:

Publication_Place: Waterbury VT 05676

Publisher: VT Center for Geographic Information

Other_Citation_Details: Tile Structure - QORTHO

Description:

Abstract:

This metadata record describes 2004 digital ortho imagery collected for Chittenden County, Vermont. The mapping includes production of truecolor digital orthophotography with a pixel of 16 centimeters (0.16 meters) using imagery collected with the Leica ADS40 digital pushbroom sensor and processed with the ISTAR system. The digital mapping products fully comply with NMAS standards for production of orthophotos at a horizontal scale of 1:1250.

Purpose:

This data set was produced by EarthData International and supplied to Chittenden County Metropolitan Planning Organization (CCMPO) for the purpose of county management.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20040424

Ending_Date: 20040501

Currentness_Reference: Publication Date

Status:

Progress: Complete

Maintenance_and_Update_Frequency: Unknown

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -073.339491

East_Bounding_Coordinate: -072.806836

North_Bounding_Coordinate: +44.729121

South_Bounding_Coordinate: +44.263824

Keywords:

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category

Theme_Keyword: imageryBaseMapsEarthCover

Theme:

Theme_Keyword_Thesaurus: EDI Thesaurus

Theme_Keyword: Digital Orthos

Theme_Keyword: ISTAR

Theme_Keyword: ADS40

Theme_Keyword: DSM

Place:

Place_Keyword_Thesaurus: Geographic Names Information System

Place_Keyword: State of Vermont

Place_Keyword: Chittenden County

Access_Constraints:

VCGI, CCMPO 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.

Use_Constraints:

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: 1 National Life Dr, Dewey Building, 2nd Floor

City: Montpelier

State_or_Province: VT

Postal_Code: 05620-2001

Country: USA

Contact_Voice_Telephone: (802) 585-0820

Contact_TDD/TTY_Telephone: None

Contact_Facsimile_Telephone:

Contact_Electronic_Mail_Address: vcgi@vermont.gov

Hours_of_Service: 9am - 5pm, M-F

Data_Set_Credit: EarthData and CCMPO

Security_Information:

Security_Classification_System: N/A

Security_Classification: Unclassified

Security_Handling_Description: No Security Considerations

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report: NA

Logical_Consistency_Report:

Compliance with the accuracy standard was ensured by the placement of GPS ground control prior to the acquisition of aerial imagery. The following checks were performed. 1. The ground control and airborne GPS data stream were validated through a fully analytical bundle aerotriangulation adjustment. 2. The DSM data were checked against the project control. The technician visited and confirmed the accuracy of the points during initial processing 3. Digital orthophotography was validated through an inspection of edge matching and visual inspection for image quality.

Completeness_Report:

The following methods are used to assure imagery accuracy. 1. Use of IMU and ground control network utilizing GPS techniques. 2. Use of airborne GPS in conjunction with the acquisition of imagery. The following software is used for validation of the 1. Aerotriangulation - ISTAR 2. DSM data - ISTAR 3. Digital Orthophotography - ISTAR The following software was used for the validation. 1. Bentley - Microstation 2. ISTAR 3. ZI-OrthoPro 4. ESRI - ArcInfo 5. EarthData Proprietary software The digital mapping products fully comply with NMAS standards for production of orthophotos at a horizontal scale of 1 / 1,250 with an orthophoto ground pixel resolution of 16 centimeters.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

The digital mapping products fully comply with NMAS standards for production of orthophotos at a horizontal scale of 1 / 1,250 with an orthophoto ground pixel resolution of 16 centimeters. No more than 10 percent of the well defined, photo-identifiable points shall be in error by more than 1/30 inch, measured on the publication scale.

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

Digital orthophotos are a 2D product. As a result there is no applicable vertical accuracy.

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator: EarthData Aviations

Publication_Date: 20040521

Publication_Time: Unknown

Title: ADS40 Aerial Acquisition

Geospatial_Data_Presentation_Form: profile

Type_of_Source_Media: Firewire

Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20040508

Ending_Date: 20040512

Source_Currentness_Reference: Ground Condition

Source_Citation_Abbreviation: Aerial Imagery

Source_Contribution:

The aerial imagery acquisition for Chittenden County was flown to support the creation of digital orthophotography with a 16 centimeter pixel. The imagery was acquired during two sorties over two days with a total of 33 flight lines. The mission was flown at 1525 meters AMT using the Leica ADS40 sensor, SP12.

Source_Information:

Source_Citation:

Citation_Information:

Originator: TerraSurv

Publication_Date: 20040817

Publication_Time: Unknown

Title: GPS Ground Control

Geospatial_Data_Presentation_Form: model

Source_Scale_Denominator: 1250

Type_of_Source_Media: electronic mail system

Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20040816

Ending_Date: 20040817

Source_Currentness_Reference: Ground Condition

Source_Citation_Abbreviation: GPS Ground Control

Source_Contribution:

Photo identifiable ground control was established after the acquisition of aerial imagery. The ground control points were established using GPS for vertical and horizontal coordinate values. Ground control references Vermont State Plane, NAD83 meters, NAVD88 meters.

Process_Step:

Process_Description:

The airborne GPS data were processed and integrated with the IMU. The results were imported into the ISTAR system for use in the aerotriangulation. The ADS40 imagery was downloaded onto the EarthData server and brought over to the UNIX based ISTAR system. The ground control was used in conjunction with the processed ABGPS results for the aerotriangulation. The properly formatted ISTAR results were used for subsequent processing.

Source_Used_Citation_Abbreviation: Aerotriangulation

Process_Date: 20040825

Source_Produced_Citation_Abbreviation: AT

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Position: Project Manager

Contact_Address:

Address_Type: mailing and physical address

Address: 7320 Executive Way

City: Frederick

State_or_Province: MD

Postal_Code: 21704

Contact_Voice_Telephone: 301-948-8550

Contact_Electronic_Mail_Address: rcharrois@earthdata.com

Hours_of_Service: Mon-Fri 9:00am to 5:00pm

Process_Step:

Process_Description:

This process describes the ISTAR digital surface modeling. ISTAR digital surface modeling is based on an auto correlated pixel matching system within the ISTAR software. The auto correlated DSM surface represents the initial surface model. This surface is then exported from the UNIX format into a Microstation compatible format. The techniques used to create the ISTAR DSM auto correlated surface are similar to those used for LIDAR processing. EarthData has developed a unique method for processing DSM data to identify and remove elevation points falling on vegetation, buildings, and other aboveground structures. The algorithms for filtering data were utilized within EarthData's proprietary software and commercial software written by TerraSolid. This software suite of tools provides efficient processing for small to large-scale, projects and has been incorporated into ISO 9001 compliant production work flows. The following is a step-by-step breakdown of the process. 1. Using the DSM ISTAR data set created by EarthData, the technician performed a visual inspection of the data to verify that the flight lines met correctly. The technician also verified that there were no voids, and that the data covered the project limits. The technician then selected a series of areas from the dataset and inspected them where adjacent flight lines met. A process, which utilizes 3-D Analyst and EarthData's proprietary software was run to detect and color code the differences in elevation values and profiles. The technician reviewed this information and located the areas that contained systematic errors or distortions that were introduced by the auto correlation. 2. Systematic distortions highlighted in step 1 were removed and the data were re-inspected. Corrections and adjustments can involve the application of angular deflection or compensation for curvature of the ground surface that can be introduced by crossing from one type of land cover to another. 3.The data was checked against the control network to ensure that vertical requirements were maintained.

Source_Used_Citation_Abbreviation: Digital Surface Model

Process_Date: 20040913

Source_Produced_Citation_Abbreviation: DSM

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Position: Project Manager

Contact_Address:

Address_Type: mailing and physical address

Address: 7320 Executive Way

City: Frederick

State_or_Province: MD

Postal_Code: 21704

Contact_Voice_Telephone: 301-948-8550

Hours_of_Service: Mon-Fri 8:30 am to 5:00 pm

Process_Step:

Process_Description:

The black and white digital orthophotography was created with a 16 centimeter pixel. Once the processed merged DSM data was in the ISTAR system the initial radiometric adjustments were performed on the imagery for each flight line attempting to reach the best possible histogram. The rectification process was run using the processed DSM surface and the radiometrically balanced imagery on each flight line. A second set of radiometric adjustments were made and mosaic lines were placed. QA/QC was performed looking for smears and other indications of problems within the digital orthophoto creation process. The final imagery data set is removed from the ISTAR environment in a process called "packaging" where the individual tiles are created. The created tiles are reviewed again for anomalies and interactive radiometric adjustment applied where needed. The final product was GeoTIFF format digital orthos with supporting TFW files.

Source_Used_Citation_Abbreviation: Digital Orthophotos

Process_Date: 20040920

Source_Produced_Citation_Abbreviation: Digital Orthos

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Position: Project Manager

Contact_Address:

Address_Type: mailing and physical address

Address: 7320 Executive Way

City: Frederick

State_or_Province: MD

Postal_Code: 21704

Country: USA

Contact_Voice_Telephone: 301-948-8550

Process_Step:

Process_Description:

Data provided to VCGI by Vermont Mapping Program with the consent of the Chittenden County MPO. Data loaded into VCGI Image Library. Files renamed to match VIL naming convention. Compressed JPEG2000 versions created for download. Revised original metadata to align with VIL standards.

Process_Date: 20100520

Process_Time: Unknown

Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Steve Sharp

Contact_Organization: VCGI

Contact_Position: GIS Database Administrator

Cloud_Cover: 0

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Raster

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: 4400

Transverse_Mercator:

Scale_Factor_at_Central_Meridian: 72 30 0.00

Longitude_of_Central_Meridian: -072.300000

Latitude_of_Projection_Origin: +72.300000

False_Easting: 500000

False_Northing: 0

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair

Coordinate_Representation:

Abscissa_Resolution: .16

Ordinate_Resolution: .16

Planar_Distance_Units: Meters

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1983

Ellipsoid_Name: Geodetic Reference System 80

Semi-major_Axis: 6378137.00

Denominator_of_Flattening_Ratio: 298.2572221010

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: VT Center for Geographic Information

Contact_Address:

Address_Type: Mailing and Physical Address

Address: 1 National Life Dr, Dewey Building, 2nd Floor

City: Montpelier

State_or_Province: VT

Postal_Code: 05620-2001

Country: USA

Contact_Voice_Telephone: (802) 585-0820

Contact_TDD/TTY_Telephone: None

Contact_Facsimile_Telephone:

Contact_Electronic_Mail_Address: vcgi@vermont.gov

Hours_of_Service: 9am - 5pm, M-F

Resource_Description: VTORTHO_0_16M_PAN_2004

Distribution_Liability:

VCGI, CCMPO, and the State of Vermont 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: JPEG2000 and GeoTIFF

Format_Specification: JPEG2000 (20x compression) and GeoTIFF

Format_Information_Content: geospatial data

File_Decompression_Technique: Image viewer

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

https://maps.vcgi.vermont.gov/gisdata/vcgi/imagery/VTORTHO/0_16M/PAN/2004/COMP/

Access_Instructions:

Download compressed (JPEG2000) from web site. Uncompressed GeoTIFF available on offline media.

Offline_Option:

Offline_Media: USB drive

Fees:

No charge when downloading from the internet, and when no custom processing is required.

Ordering_Instructions: Send an email describing data request to vcgi@vermont.gov

Turnaround: About 5 days.

Custom_Order_Process: Send an email describing data request to vcgi@vermont.gov

Technical_Prerequisites: GIS Software

Available_Time_Period:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 20100510

Time_of_Day: Unknown

Metadata_Reference_Information:

Metadata_Date: 20100510

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: 1 National Life Dr, Dewey Building, 2nd Floor

City: Montpelier

State_or_Province: VT

Postal_Code: 05620-2001

Country: USA

Contact_Voice_Telephone: (802) 585-0820

Contact_TDD/TTY_Telephone: None

Contact_Facsimile_Telephone:

Metadata_Standard_Name: FGDC Content Standards for Digital Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: Local time

Metadata_Access_Constraints: None

Metadata_Use_Constraints: None

Metadata_Security_Information:

Metadata_Security_Classification_System: N/A

Metadata_Security_Classification: Unclassified

Metadata_Security_Handling_Description: No security considerations