Identification_Information: Citation: Citation_Information: Originator: Aero-Graphics, Inc. Publication_Date: 2013 Title: TetonCounty_1983 Geospatial_Data_Presentation_Form: raster digital data Description: Abstract: This task order consists of digital orthophoto production covering areas within Teton County, Wyoming. There are a total of 12 images available in TIFF and SID format. All tiles were flown in 1983. Purpose: This data depicts geographic features on the surface of the earth. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1983 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -111.070285 East_Bounding_Coordinate: -110.259115 North_Bounding_Coordinate: 43.955780 South_Bounding_Coordinate: 43.201582 Keywords: Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: 2.0 foot orthoimage Theme_Keyword: rectified photograph Theme_Keyword: rectified image Theme_Keyword: orthophoto Theme_Keyword: orthoimage Theme_Keyword: image map Place: Place_Keyword_Thesaurus: None Place_Keyword: US Place: Place_Keyword_Thesaurus: None Place_Keyword: WY Place: Place_Keyword_Thesaurus: None Place_Keyword: Wyoming Place: Place_Keyword_Thesaurus: None Place_Keyword: Teton County Temporal: Temporal_Keyword_Thesaurus: None Temporal_Keyword: 1983 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be aware that temporal changes may have occurred since this data set was collected and that some parts of this data may no longer represent actual surface conditions.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. Data_Set_Credit: Aero-Graphics, Inc. Native_Data_Set_Environment: Microsoft Windows Vista Version 6.1 (Build 7601) Service Pack 1; ESRI ArcCatalog 9.3.1.3000 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. Completeness_Report: Orthoimages are visually inspected for completeness to ensure that no gaps or image misplacements exist within and between adjacent images. These images are derived by mosaicking multiple images to ensure complete coverage. Source imagery is cloud free. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: The most appropriate benchmarks to compare the 1983 imagery were 2009 NAIP imagery and USGS 7.5’ quadrangles. Our strategic spot checks found horizontal error averaging 20’ in many of the flat valley areas, but more significant errors (~80’) were present near the mountain peaks and ridges. Lineage: Process_Step: Process_Description: Aerotriangulation Process. Trimble-Inpho's Match-AT software (Version 5.5) was utilized to perform fully analytical digital aero-triangulation. Manually measured tie points extended full control for each stereo model. Camera calibration parameters were provided for the two cameras used on this flight and were used to account for lens distortions and other aberrations. In this process we assigned client-provided X-Y values to the center of each image for initial image positioning and orientation. The image block was then stitched together by manually measuring tie points. These points tie each image to its neighbors in the same flightline and also to those in adjacent flightlines. Photo identifiable control points, common to the 1983 imagery and USGS 7.5-minute quad sheets, were identified and measured manually throughout the Snake River Valley and into the foothills. Out of necessity, many of these were less-than-ideal features such as road intersections that had changed minimally over the 30-year time period. These photo IDs, along with tie points and images, were then processed together in a final bundle adjustment to refine the photo center points and provide the best orientation solution that minimized cumulative error throughout the project. Once the AT solution was complete, we used Inpho DTMaster (version 5.5) to check every model and ground control point in stereo. We confirmed that some of the expected errors with the photo IDs did exist. These errors were introduced through minor photo ID positional differences between datasets over 30 years. In conjunction with minimizing ground control error, we ensured that all parallax was cleared and that all tie points were on the ground – with no points floating or digging. Our QA/QC procedures aim to find gross errors and correct them before the AT results are passed on to our orthorectification staff. Process_Date: 2013 Process_Step: Process_Description: Digital Orthorectification Process. An Aero-Graphics-generated 60-foot autocorrelated grid was used for the orthorectification surface, and the digital imagery underwent automatic orthorectification in a one-step batch process using Inpho’s OrthoMaster software. Aero-Graphics utilizes Inpho’s distributed processing features, which allows multiple idle workstations to process ortho tiles simultaneously and greatly expedites turnaround time. The orthorectified imagery tiles were then adjusted in Inpho’s OrthoVista software to compute subtle radiometric adjustments that compensate for visual effects within individual images. OrthoVista then performed a block-wide color balance by adjusting adjacent images to match. This achieves a uniform appearance across the project. Multiple orthophotos were combined into one seamless, balanced and geometrically-perfect ortho mosaic. Aero-Graphics then conducted its standard quality control procedures. The orthoimagery was inspected by a QC Inspector completely removed from the project, where linear and above-ground features were reviewed to detect misalignment and warping. In addition, the Project Manager and AT/Ortho Manager spot-checked all deliverables for correct balance, accuracy, and data integrity prior to delivery. Process_Date: 2013 Cloud_Cover: 0% Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Map_Projection: Map_Projection_Name: Transverse Mercator Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.999938 Longitude_of_Central_Meridian: -110.083333 Latitude_of_Projection_Origin: 40.500000 False_Easting: 2624666.666667 False_Northing: 328083.333333 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 0.000001 Ordinate_Resolution: 0.000001 Planar_Distance_Units: survey feet Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1983 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_Distance_Units: feet Altitude_Encoding_Method: Explicit elevation coordinate included with horizontal coordinates Entity_and_Attribute_Information: Overview_Description: Entity_and_Attribute_Overview: Natural color orthoimagery is organized in three color bands or channels which represent the red, green, and blue portions of the spectrum. Each image pixel is assigned a triplet of numeric values, one for each color band. Numeric values range from 0 to 255. Areas where data is incomplete due to lack of full image coverage are represented with the numeric value of 0. Black and white orthoimagery is organized in an 8-bit gray-scale value between 0-255. Zero represents black, while 255 represents white. All values between zero and 255 represent a shade of gray varying from black to white. Entity_and_Attribute_Detail_Citation: U.S. Department of the Interior, U.S. Geological Survey, 1996, Standards for Digital Orthophotos: Reston, VA. Metadata_Reference_Information: Metadata_Date: 20130710 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: Aero-Graphics, Inc. Contact_Address: Address_Type: mailing and physical address Address: 40 West Oakland Ave City: Salt Lake City State_or_Province: Utah Postal_Code: 84115-3007 Country: UNITED STATES Contact_Voice_Telephone: (801) 487-3273 Contact_Facsimile_Telephone: (801) 487-3313 Contact_Electronic_Mail_Address: agi@aero-graphics.com Hours_of_Service: 7:30 AM - 5 PM Mon. - Fri. Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Time_Convention: local time Metadata_Extensions: Online_Linkage: http://www.esri.com/metadata/esriprof80.html Profile_Name: ESRI Metadata Profile