Identification_Information: Citation: Citation_Information: Originator: USDA-FSA-APFO Publication_Date: 20040503 Title: USDA-FSA-APFO Digital Ortho Mosaic: ortho_e1-1_wv003 Description: Abstract: This file was generated by compressing mosaicked digital orthophoto quadrangles (MDOQs) that cover a county. MrSID compression, with mosaic option, was used. Default values for the compression ratio are (20:1) and compression levels(10) are used. MDOQs are a mosaic of digital orthophoto quarter quads (DOQs) produced through the National Digital Ortho Photo Program (NDOP). The image characteristics of the orthophotos in this series follow that of the source DOQs. The ground sample distance is 1 meter in the x direction and 1 meter in the y direction and the images are rectified to the UTM Coordinate System, NAD83. Each image covers a 7.5 minute quadrangle with a 300 meter overedge between quads. The DOQs are mosaicked to remove visible seam lines due to characteristics of the source aerial photography. Mosaic cutlines are interactively defined within the DOQ image overedge by examining each DOQ pairwise with adjoining DOQs and placing the seam line where image tone differences and geometric misalignments are minimized. Due to the overedge between ortho quads, and depending on the placement of seam lines, each ortho quad can contain portions of as many as 16 DOQs. During the mosaicking process, the image tone of all input DOQs is adjusted towards a common value. The primary purpose of the ortho quads is to support USDA Field Service Centers located in counties throughout the United States. The DOQs are edge matched or seamed across county boundaries. In counties that are split by UTM zones, ortho quads are reprojected into the predominate zone. Ortho quads may be produced and distributed in an incomplete form when constituent DOQs are not available at production date. Purpose: Digital orthophotos serve a wide variety of purposes from interim mapping to recording land use information. Time_Period_of_Content: Time_Period_Information: Multiple_Dates/Times: Single_Date/Time: Calendar_Date: 1996 Single_Date/Time: Calendar_Date: 1997 Currentness_Reference: Majority years of Photography Dates for MDOQs. Status: Progress: Complete Maintenance_and_Update_Frequency: Irregular Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -78.250 East_Bounding_Coordinate: -77.750 North_Bounding_Coordinate: 39.625 South_Bounding_Coordinate: 39.250 Keywords: Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: Digital Orthophoto Theme_Keyword: Mosaic Theme_Keyword: DOQ Theme_Keyword: ortho quad Theme_Keyword: ortho imagery Theme_Keyword: USDA Theme_Keyword: compression Theme_Keyword: MrSID Theme_Keyword: MDOQ Place: Place_Keyword_Thesaurus: GNIS Place_Keyword: WV Place_Keyword: BERKELEY Place_Keyword: BERKELEY CO WV FSA Place_Keyword: 54003 Access_Constraints: None Use_Constraints: None, The Aerial Photography Field Office asks to be credited in derived products. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: USDA-FSA Aerial Photography Field Office Contact_Address: Address_Type: mailing and physical address Address: 2222 West 2300 South City: Salt Lake City State_or_Province: Utah Postal_Code: 84119-2020 Country: USA Contact_Voice_Telephone: 801-973-3500 Contact_Facsimile_Telephone: 801-975-3529 Contact_Electronic_Mail_Address: digital@apfo.usda.gov Browse_Graphic: Browse_Graphic_File_Name: None Browse_Graphic_File_Description: None Browse_Graphic_File_Type: None Native_Data_Set_Environment: MrSID Compress Publisher ver. 1.x Data_Quality_Information: Logical_Consistency_Report: None Completeness_Report: None Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: USGS Digital Orthophoto Specs. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: N/A 2d only Lineage: Source_Information: Source_Citation: Citation_Information: Originator: Aerial Photography Field Office Title: Z3907726 Publication_Date: 20040420 Source_Scale_Denominator: 40000 Type_of_Source_Media: CD Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1997 Source_Currentness_Reference: Majority Year of Source Photography Dates for MDOQ Z3907726 Source_Citation_Abbreviation: MDOQ Source_Contribution: 7.5 min Mosaic Quadrangle used in Mosaicked County Image. Source_Information: Source_Citation: Citation_Information: Originator: Aerial Photography Field Office Title: Z3907725 Publication_Date: 20040420 Source_Scale_Denominator: 40000 Type_of_Source_Media: CD Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1997 Source_Currentness_Reference: Majority Year of Source Photography Dates for MDOQ Z3907725 Source_Citation_Abbreviation: MDOQ Source_Contribution: 7.5 min Mosaic Quadrangle used in Mosaicked County Image. Source_Information: Source_Citation: Citation_Information: Originator: Aerial Photography Field Office Title: M3907832 Publication_Date: 20040420 Source_Scale_Denominator: 40000 Type_of_Source_Media: CD Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1997 Source_Currentness_Reference: Majority Year of Source Photography Dates for MDOQ M3907832 Source_Citation_Abbreviation: MDOQ Source_Contribution: 7.5 min Mosaic Quadrangle used in Mosaicked County Image. Source_Information: Source_Citation: Citation_Information: Originator: Aerial Photography Field Office Title: M3907831 Publication_Date: 20040420 Source_Scale_Denominator: 40000 Type_of_Source_Media: CD Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1996 Source_Currentness_Reference: Majority Year of Source Photography Dates for MDOQ M3907831 Source_Citation_Abbreviation: MDOQ Source_Contribution: 7.5 min Mosaic Quadrangle used in Mosaicked County Image. Source_Information: Source_Citation: Citation_Information: Originator: Aerial Photography Field Office Title: Z3907734 Publication_Date: 20040420 Source_Scale_Denominator: 40000 Type_of_Source_Media: CD Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1997 Source_Currentness_Reference: Majority Year of Source Photography Dates for MDOQ Z3907734 Source_Citation_Abbreviation: MDOQ Source_Contribution: 7.5 min Mosaic Quadrangle used in Mosaicked County Image. Source_Information: Source_Citation: Citation_Information: Originator: Aerial Photography Field Office Title: Z3907733 Publication_Date: 20040420 Source_Scale_Denominator: 40000 Type_of_Source_Media: CD Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1997 Source_Currentness_Reference: Majority Year of Source Photography Dates for MDOQ Z3907733 Source_Citation_Abbreviation: MDOQ Source_Contribution: 7.5 min Mosaic Quadrangle used in Mosaicked County Image. Source_Information: Source_Citation: Citation_Information: Originator: Aerial Photography Field Office Title: M3907840 Publication_Date: 20040420 Source_Scale_Denominator: 40000 Type_of_Source_Media: CD Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1997 Source_Currentness_Reference: Majority Year of Source Photography Dates for MDOQ M3907840 Source_Citation_Abbreviation: MDOQ Source_Contribution: 7.5 min Mosaic Quadrangle used in Mosaicked County Image. Source_Information: Source_Citation: Citation_Information: Originator: Aerial Photography Field Office Title: M3907839 Publication_Date: 20040420 Source_Scale_Denominator: 40000 Type_of_Source_Media: CD Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1996 Source_Currentness_Reference: Majority Year of Source Photography Dates for MDOQ M3907839 Source_Citation_Abbreviation: MDOQ Source_Contribution: 7.5 min Mosaic Quadrangle used in Mosaicked County Image. Source_Information: Source_Citation: Citation_Information: Originator: Aerial Photography Field Office Title: Z3907741 Publication_Date: 20040420 Source_Scale_Denominator: 40000 Type_of_Source_Media: CD Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1997 Source_Currentness_Reference: Majority Year of Source Photography Dates for MDOQ Z3907741 Source_Citation_Abbreviation: MDOQ Source_Contribution: 7.5 min Mosaic Quadrangle used in Mosaicked County Image. Source_Information: Source_Citation: Citation_Information: Originator: Aerial Photography Field Office Title: M3907848 Publication_Date: 20040420 Source_Scale_Denominator: 40000 Type_of_Source_Media: CD Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1997 Source_Currentness_Reference: Majority Year of Source Photography Dates for MDOQ M3907848 Source_Citation_Abbreviation: MDOQ Source_Contribution: 7.5 min Mosaic Quadrangle used in Mosaicked County Image. Source_Information: Source_Citation: Citation_Information: Originator: Aerial Photography Field Office Title: M3907847 Publication_Date: 20040420 Source_Scale_Denominator: 40000 Type_of_Source_Media: CD Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1996 Source_Currentness_Reference: Majority Year of Source Photography Dates for MDOQ M3907847 Source_Citation_Abbreviation: MDOQ Source_Contribution: 7.5 min Mosaic Quadrangle used in Mosaicked County Image. Process_Step: Process_Description: The production procedures for mosaicking DOQs in ortho quads can vary according to the work project area. The following steps apply to the mosaicking process in general. Image Tone Adjustment The area of coverage that images are matched within are individual counties. Image tone adjustment is performed for two primary reasons: 1. To produce a well contrasted image so that users are not required to adjust the tone upon display or to create an enhancement lookup table upon delivery. 2. To reduce visible tone differences between mosaic seam lines. Methods of Image tone adjustment: -- Manual Contrast Adjustment Each input DOQ image is viewed and, if necessary, the contrast and brightness is adjusted. -- Automatic Contrast Adjustment Each input DOQ within a county is also run through an automatic tone or range adjustment that drives all input images toward a common value. The intention is to reduce vignetting and "hot spots" from the source photography, and to minimize tone differences along mosaic seam lines. -- Seam Feathering Tone adjustment between input DOQs is adjusted along a gradation a specified distance out from the seam line. This smooths or feathers abrupt tone differences which would otherwise highlight seam lines. Defining Mosaic Seam Lines Input DOQs are displayed pairwise so the operator can decide where, within the overedge area, to place the seam lines. In general, the goal is to reduce visible seam lines due to differences in source photography. Specifically, the goal is to: 1) Present single contiguous agricultural fields as though they are from a single date of source photography. 2) To minimize the visible effects of geometric misalignments between DOQs, such as an offset in linear field boundaries where adjoining DOQs meet. The operator continually emaluates image tone differences and geometric misalignments between adjoining DOQs and interactively places the seam where both are minimized. DOQs are edge matched, or seamed, across county boundaries. Mosaic Generation Image 7.5 minute quad tiles are either generated individually and sequentially as work progresses through a project, or cut out from a larger mosaic after it is generated. Since the imagery is being resampled to the same coordinate system, nearest neighbor resampling is used. Rules for Seam Line Placement: 1. Misalignments less than 3 meters with same photography dates. - No Restrictions on seam line placement. 2. Misalignments less than 3 meters with different photography dates. - Place seam in non-agricultural areas such as roadway easements, waterways etc.. - Place seam in same apparent landcover type or conditions in agricultural areas such as pastures, fallow fields or cropped fields. 3. Misalignments greater than 3 meters with same photography dates. - If possible, avoid crossing linear features in agricultural areas with seam line. 4. Misalignments greater than 3 meters with different photography dates. - If possible, avoid crossing linear features in agricultural areas with seam line. - Place seam in non-agricultural areas such as roadway easements, waterways etc.. - Place seam in same apparent landcover type or conditions in agricultural areas such as pastures, fallow fields or cropped fields. This file was generated by compressing mosaicked digital orthophoto quadrangles (MDOQs) that cover a county. MrSID compression, with mosaic option, was used. Default values for the compression ratio are (20:1) and compression levels(10) are used. Process_Date: 20040503 Spatial_Data_Organization_Information: Indirect_Spatial_Reference: BERKELEY, WV Direct_Spatial_Reference_Method: Raster Raster_Object_Information: Raster_Object_Type: Pixel Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 17 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.9996 Longitude_of_Central_Meridian: 81W Latitude_of_Projection_Origin: 0.0 False_Easting: 500000 False_Northing: 0.0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: row and column Coordinate_Representation: Abscissa_Resolution: 1 Ordinate_Resolution: 1 Planar_Distance_Units: meters Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1983 Ellipsoid_Name: Geodetic Reference System 80 Semi-major_Axis: 6378137 Denominator_of_Flattening_Ratio: 298.257 Entity_and_Attribute_Information: Overview_Description: Entity_and_Attribute_Overview: 8-bit pixels represent brightness values 0 - 255 Entity_and_Attribute_Detail_Citation: None Distribution_Information: Distributor: Contact_Information: Contact_Person_Primary: Contact_Person: Supervisor Digital Services Branch Contact_Organization: USDA-FSA Aerial Photography Field Office Contact_Address: Address_Type: mailing and physical address Address: 2222 West 2300 South City: Salt Lake City State_or_Province: Utah Postal_Code: 84119-2020 Country: USA Contact_Voice_Telephone: 801-975-3500 Contact_Facsimile_Telephone: 801-975-3529 Contact_Electronic_Mail_Address: digital@apfo.usda.gov Distribution_Liability: In no event shall the creators, custodians, or distributors of this information be liable for any damages arising out of its use ( or the inability to use it). Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: Tiff Format_Information_Content: Black and White Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: None Offline_Option: Offline_Media: CD-ROM Recording_Format: ISO 9660 Fees: Contact the Aerial Photography Field Office for more information Resource_Description: Spot Number: 433515 Metadata_Reference_Information: Metadata_Date: 20040503 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: USDA-FSA Aerial Photography Field Office Contact_Address: Address_Type: mailing and physical address Address: 2222 West 2300 South City: Salt Lake City State_or_Province: Utah Postal_Code: 84119-2020 Country: USA Contact_Voice_Telephone: 801-975-3500 Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998