VTORTHO_0_3M_PAN_2022

Metadata:

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

Identification_Information:

Citation:

Citation_Information:

Originator: VT Center for Geographic Information

Publication_Date: 20230202

Title: VTORTHO_0_3M_PAN_2022

Edition: 2022A

Geospatial_Data_Presentation_Form: remote-sensing image

Series_Information:

Series_Name: Vermont 2022 Orthoimagery - 30 centimeter

Issue_Identification: 2022A

Publication_Information:

Publication_Place: Montpelier VT 05620-2001

Publisher: VT Center for Geographic Information

Other_Citation_Details: Tile Structure - 1800m X 1800m

Description:

Abstract:

30-centimeter black and white (greyscale) orthoimagery tiles (uncompressed GeoTIFF and compressed JPEG2000) acquired spring 2022. Product: 30-centimeter raw uncompressed imagery (uncompressed TIFF), black and white orthoimagery tiles (uncompressed GeoTIFF and compressed JPEG2000), and color orthoimagery tiles (uncompressed GeoTIFF and compressed JPEG2000). Geographic Extent: The 2022 acquisition extent included all of Addison, Bennington, Chittenden, Franklin, Grand Isle, Lamoille, Rutland, Windham and Windsor counties and portions of Orange, Orleans, Washington and Caledonia counties. Dataset Description: This metadata describes the 30cm pixel resolution digital orthoimagery produced for the State of Vermont by the Sanborn Map Company. The orthoimagery provided is 4-band (R, G, B, NIR), 8-bit per pixel and delivered in section tiles in uncompressed GeoTIFF and JP2000 (18:1 compression for color, 10:1 for greyscale) compressed formats. The data was collected on April 11th - May 9th, 2022 at an altitude of 5770.5 meters (AGL) using an UltraCam Eagle camera sensor. The Vermont 2022 Orthoimagery project called for the planning, acquisition, processing and derivative products of imagery data to be collected at an ground sample distance of 30 centimeters. Project specifications are based on the ASPRS Positional Accuracy Standards for Digital Geospatial Data (2014). The data were developed based on a horizontal projection/datum of NAD83 (2011), State Plane Coordinate System Vermont (FIPS 4400), meters. Raw imagery data were produced in 16-bit 4-band (RGB-IR) uncompressed format, then processed to create 32-bit 4-band (8-bit per band RGB-IR) orthorectified tiles. Compressed orthoimagery was produced in JPEG2000 format (18:1 compression for color, 10:1 for greyscale). Additional sets of uncompressed GeoTIFF and compressed JPEG2000 data were produced in black and white (greyscale). A total of 6399 tiles were produced with a tile size of 1,800-meters x 1,800 meters. Ground Conditions: Imagery was collected in the spring of 2022 at a sun angle greater than 30 degrees.

Purpose:

These data were collected as part of a 5-year project issued by the State of Vermont to collect imagery covering various parts of the state over a period of five consecutive leaf-off Spring seasons. These data depict geographic features on the surface of the earth.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20220411

Ending_Date: 20220509

Currentness_Reference: ground condition

Status:

Progress: Complete

Maintenance_and_Update_Frequency: Unknown

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -73.4708

East_Bounding_Coordinate: -72.1459

North_Bounding_Coordinate: 45.0328

South_Bounding_Coordinate: 42.7123

Keywords:

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Category

Theme_Keyword: ImageryBaseMapsEarthCover

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: 30 centimeter orthoimage

Theme_Keyword: 30 cm orthoimage

Theme_Keyword: 0.3 meter orthoimage

Theme_Keyword: 0.3 m orthoimage

Theme_Keyword: rectified photograph

Theme_Keyword: rectified image

Theme_Keyword: orthophoto

Theme_Keyword: four band orthophoto

Theme_Keyword: orthoimage

Theme_Keyword: image map

Place:

Place_Keyword_Thesaurus:

U.S. Department of Commerce, 1995, Countries, dependencies, areas of special sovereignty, and their principal administrative divisions, Federal Information Processing Standard (FIPS) 10-4): Washington, D.C., National Institute of Standards and Technology.

Place_Keyword: US

Place:

Place_Keyword_Thesaurus:

U.S. Department of Commerce, 1987, Codes for the Identification of the States, the District of Columbia and the outlying areas of the United States, and associated areas (Federal Information Processing Standard (FIPS) 5-2): Washington, D.C., National Institute of Standards and Technology.

Place_Keyword: VT

Place:

Place_Keyword_Thesaurus: None

Place_Keyword: State of Vermont

Use_Constraints:

VCGI 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.

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: None

Contact_Electronic_Mail_Address: vcgi@vermont.gov

Hours_of_Service: 9am - 5pm, M-F

Supplemental_Information:

Project Name: Vermont 2022 Orthoimagery Acquisition Project Location: Addison, Bennington, Chittenden, Franklin, Grand Isle, Lamoille, Rutland, Windham and Windsor counties and portions of Orange, Orleans, Washington and Caledonia counties. Please see the bounding coordinates for tile location. Ground Sample Distance: 30 cm Output format: GeoTIFF and JPEG2000 Spectrum: 4 separate, distinct bands (red, blue green, and near infrared) Output: Raw images are stored in strips which are processed into TIFs which are then seamed into mosaics. Project acquisition dates: The data was collected on April 11th - May 9th, 2022 at an altitude of 5770.5 meters above ground level (AGL) Dector types and manufacturer: UltraCam Eagle Mark 1 (UC-E-1-70512096-f100), UltraCam Eagle Mark 1 (UC-E-1-50311261-f100) Dector types and manufacturer: UltraCam Eagle CCD sensor Filters used (if any): none Band to band registration accuracy (in pixels): Please see individual camera calibration reports included in the final report.

None

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

Radiometry is verified by visual inspection of the digital orthophoto. Slight systematic radiometric differences may exist between adjacent orthoimage files; these are due primarily to differences in source image capture dates and sun angles along flight lines. These differences can be observed in an image's general lightness or darkness when it is compared to adjacent orthoimage file coverages. Tonal balancing may be performed over a group of images during the mosaicking process which may serve to lighten or darken adjacent images for better color tone matching.

Logical_Consistency_Report:

Since the ortho images are raster products, the logical consistency is based on how well the images fit between image tiles and between individual photo frames use to produce the ortho mosaics.

Completeness_Report:

The 6399 ortho image tiles are checked for missing pixels, gaps, overlaps and other anomalies generally associated with digital orthophoto products. Any discrepencies in the ortho tiles are resolved through the use of proprietary and industry editing tools. Once the images are copied to the deliverable media they are further checked for naming, image completeness, and ability to be loaded in ArcMap.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

The project specifications require that horizontal accuracy be computed for orthoimagery files. The required accuracy meets or exceeds the ASPRS Class I Accuracy standards for 30-cm maps, derived according to the latest ASPRS standards. The horizontal accuracy was tested with 17 check points. These check points were not used in the calibration or post-processing of the imagery data. The check points were distributed throughout the project area and were surveyed using GPS techniques. The x and y positions of where the checkpoints fell on the orthoimagery were collected. These values were then compared to the surveyed control point x and y values. Accuracy has been tested to meet 0.300 meter or better RMSEx/RMSEy and 0.33 meter or better RMSEr using ASPRS Class I Accuracy Standards.

Quantitative_Horizontal_Positional_Accuracy_Assessment:

Horizontal_Positional_Accuracy_Value: 0.293

Horizontal_Positional_Accuracy_Explanation:

Tested 0.293 meters RMSEx as defined by the ASPRS Class 1 Accuracy Standards for 30-cm maps. The RMSEx of the imagery was calculated using 17 independent check points.

Quantitative_Horizontal_Positional_Accuracy_Assessment:

Horizontal_Positional_Accuracy_Value: 0.143

Horizontal_Positional_Accuracy_Explanation:

Tested 0.143 meters RMSEy as defined by the ASPRS Class 1 Accuracy Standards for 30-cm maps. The RMSEy of the imagery was calculated using 17 independent check points.

Quantitative_Horizontal_Positional_Accuracy_Assessment:

Horizontal_Positional_Accuracy_Value: 0.33

Horizontal_Positional_Accuracy_Explanation:

Tested 0.33 meters RMSEr as defined by the ASPRS Class 1 Accuracy Standards for 30-cm maps. The RMSEr of the imagery was calculated using 17 independent check points.

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report: There is no vertical component for orthophotos.

Lineage:

Process_Step:

Process_Description:

Image acquisition by Sanborn Map Company, was collected between April 11th - May 9th, 2022 using an UltraCam Eagle Camera. Imagery and GPS/IMU data is downloaded from disc on the plane to disc on the ground. GPS/IMU mission data is processed together with simultaneously collected ground-based GPS base station data in forward and reverse directions. This precisely determines the aerial camera's position and orientation in the terrain (project) coordinate system and allows for correct orientation of the imagery.

Process_Date: 20230202

Source_Produced_Citation_Abbreviation: Aerial Imagery

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: The Sanborn Map Company, Inc.

Contact_Person: Shawn Benham

Contact_Position: Vice President of Programs

Contact_Address:

Address_Type: Mailing

Address: 1935 Jamboree Drive, Suite 100

City: Colorado Springs

State_or_Province: Colorado

Postal_Code: 80920

Country: USA

Contact_Voice_Telephone: 719-502-1296

Contact_Electronic_Mail_Address: sbenham@sanborn.com

Process_Step:

Process_Description:

DEM Review/Updating. The LiDAR surface is reviewed and updated as needed to meet the final orthorectification standards set in this project.

Process_Date: 20230202

Process_Step:

Process_Description:

Using the processed GPS/IMU data and correctly oriented imagery, a bundle adjustment is computed (AT).

Process_Date: 20230202

Process_Step:

Process_Description:

Orthoimagery is created using the AT solution and Lidar derived DTM. The orthoimagery is then color balanced to the acceptable parameters established by the customer. Orthoimagery then undergoes manual quality control to check for issues as outlined in the Digital Orthoimagery Acceptance Criteria document. Issues such as warps, smears, misalignments, etc. are corrected using proprietary tools and Adobe PhotoShop. Upon completion of the QC process, the orthoimagery is provided to the client for review in uncompressed TIFF/TFW format.

Process_Date: 20221107

Process_Step:

Process_Description:

Sanborn delivered final QCed data to VCGI. VCGI loaded data into VCGI Image Library (VIL) and VT Open Geodata Portal.

Process_Date: 20230202

Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Steve Sharp

Contact_Organization: VCGI

Contact_Position: GIS Database Administrator

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Raster

Raster_Object_Information:

Raster_Object_Type: pixel

Row_Count: 6000

Column_Count: 6000

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: 0.999964285714286

Longitude_of_Central_Meridian: -72.5

Latitude_of_Projection_Origin: 42.5

False_Easting: 500000.0

False_Northing: 0.0

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: row and column

Coordinate_Representation:

Abscissa_Resolution: 0.3

Ordinate_Resolution: 0.3

Planar_Distance_Units: meter

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1983 (2011)

Ellipsoid_Name: Geodetic Reference System 80

Semi-major_Axis: 6378137.0

Denominator_of_Flattening_Ratio: 298.257222101

Entity_and_Attribute_Information:

Overview_Description:

Entity_and_Attribute_Overview:

Four band orthoimagery is organized in four color bands or channels which represent the red, green, blue (RGB) and infrared (IR) portions of the spectrum. Each image pixel is assigned a quadruplet of numeric values, one for each color band. Numeric values range from 0 to 255. There are no void areas in this dataset.

Entity_and_Attribute_Detail_Citation:

U.S. Department of the Interior, U.S. Geological Survey, 1996, Standards for Digital Orthophotos: Reston, VA.

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: None

Contact_Electronic_Mail_Address: vcgi@vermont.gov

Hours_of_Service: 9am - 5pm, M-F

Resource_Description: VTORTHO_0_3M_CLRIR_2022

Distribution_Liability:

VCGI 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 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_3M/PAN/2022/COMP/

Access_Instructions: Downloads available from geodata.vermont.gov.

Offline_Option:

Offline_Media: NOT available on offline media.

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: 20230202

Metadata_Reference_Information:

Metadata_Date: 20230202

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: None

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