eng utf8 dataset U.S. Geological Survey Earth Resources Observation and Science (EROS) Center 703 648 4543 U.S. Geological Survey Earth Resources Observation and Science (EROS) Center 47914 252nd Street Sioux Falls SD 57198 USA lta@usgs.gov 0800 - 1600 CT, M-F pointOfContact 20000801 ISO 19115 2003 http://earthexplorer.usgs.gov Digital Orthophoto Quadrangle: DI00000000044769-TETON VILLAGE-NW,WY 19970514 publication USGS Earth Resources Observation & Science (EROS) Center originator imageDigital Orthophotos combine the image characteristics of a photograph with the geometric qualities of a map. The primary digital orthophotoquadrangle (DOQ) is a 1-meter ground resolution, quarter-quadrangle (3.75 minutes of latitude by 3.75 minutes of longitude) image cast on the Universal Transverse Mercator projection (UTM) on the North American Datum of 1983 (NAD83).The geographic extent of the DOQ is equivalent to a quarter-quadrangle plus the overedge ranges from a minimum of 50 meters to a maximum of 300 meters beyond the extremes of the primary and secondary corner points. The overedge is included to facilitate tonal matching for mosaicking and for the placement of the NAD83 and secondary datum corner ticks. The normal orientation of data is by lines (rows) and samples (columns). Each line contains a series of pixels ordered from west to east with the order of the lines from north to south. The radiometric image brightness values are stored as 256 gray levels, ranging from 0 to 255. The standard, uncompressed gray scale DOQ format contains an ASCII header followed by a series of 8-bit image data lines. The keyword-based, ASCII header may vary in the number of data entries. The header is affixed to the beginning of the image and is composed of strings of 80 characters with an asterisk (*) as character 79 and an invisible newline character as character 80. Each keyword string contains information for either identification, display, or registration of the image. Additional strings of blanks are added to the header so that the length of a header line equals the number of bytes in a line of image data. The header line will be equal in length to the length of an image line. If the sum of the byte count of the header is less than the sample count of one DOQ image line, then the remainder of the header is padded with the requisite number of 80 character blank entries, each terminated with an asterisk and newline character. DOQs serve a variety of purposes, from interim maps to field references for Earth science investigations and analysis. The DOQ is useful as a layer of a geographic information system and as a tool for revision of digital line graphs and topographic maps. Customer Services Representative U.S. Geological Survey Earth Resources Observation and Science (EROS) Center 1-800-ASK-USGS U.S. Geological Survey Earth Resources Observation and Science (EROS) Center 47914 252nd Street Sioux Falls SD 57198-0001 USA lta@usgs.gov 0800 - 1600 CT, M-F Online Ordering: Once you have filled out and submitted the online ordering form found at http://earthexplorer.usgs.gov, EROS uses a secure credit card server that will encrypt your sensitive information and pass it from your browser to the EROS web server. Mail Ordering: First obtain the ordering information from Earth Explorer. Mail this information, along with your payment (check or money order), to USGS, Earth Resources Observation & Science (EROS) Center, 47914 252nd Street, Sioux Falls SD 57198-0001 pointOfContact Browse graphic for: http://edcsns17.cr.usgs.gov/browse/doq_qq/T/teton_village_WY/O4311026.NWS.44769.jpg image JPEG orthophoto 1-meter orthophoto 3.75- x 3.75-minute orthophoto aerial photograph digital orthophoto DOQ digital image map digital orthophotoquad DOQQ 7.5- x 7.5-minute orthophoto 2-meter orthophoto quarter-quadrangle orthophoto rectified photograph theme none US MX CA WY place None otherRestrictions otherRestrictions Access Constraints: none Use Constraints: None. Acknowledgement of the U.S. Geological Survey is appreciated in products derived from these data. Distribution Liability: Although these data have been processed successfully on a computer system at the USGS, no warranty expressed or implied is made by the USGS regarding the use of the data on any other system, nor does the act of distribution constitute any such warranty. unclassified none none eng -110.875 -110.8125 43.5625 43.625 19940824 For further information on USGS Maps, see: http://geography.usgs.gov/products.html#maps The standard, archived, quarter-quadrangle DOQ is uncompressed and is approximately 45-50 Mb in size. DOQs are distributed in both compressed and uncompressed format. The compressed DOQ is approximately 4-6 Mb in size and is accompanied by a separate header file. false Entity and Attribute Overview: Each pixel contains an 8-bit gray-scale value between 0 and 255 for DOQs from a panchromatic source. A value of 0 represents the color black, while a value of 255 represents the color white. All values between 0 and 255 are represented as a shade of gray, varying from black to white. For color-infrared and natural color DOQs, a digital number from 0 to 255 also will be asssigned to each pixel, but that number will refer to a color look-up table which will contain the red, green, and blue (RGB) values, each from 0 to 255, for that digital number. Areas where the rectification process is incomplete due to incomplete data (e.g., lack of elevation data, gaps), are represented with the numeric value of 0. Entity and Attribute Detail Citation: U.S. Department of the Interior, U.S. Geological Survey, guide for digital orthophotos: Reston, VA. A hypertext version is available at: http://edc.usgs.gov/products/aerial/doq.html U.S. Department of the Interior, U.S. Geological Survey, 1992, Standards for digital orthophotos: Reston, VA. Softcopies in ASCII, WordPerfect, and PostScript format are available at: http://rockyweb.cr.usgs.gov/nmpstds/doqstds.html / NaN USGS_DOQ 1 Optional (Native) or GeoTIFF U.S. Geological Survey Earth Resources Observation and Science (EROS) Center 703 648 4543 Customer Services, U.S. Geological Survey Earth Resources Observation and Science (EROS) Center 47914 252nd Street Sioux Falls SD 57198-0001 USA lta@usgs.gov 0800 - 1600 CT, M-F distributor None Access Instructions: Go to http://earthexplorer.usgs.gov and search for your data! Ordering Instructions: Dataset searching and ordering capabilities are available though EarthExplorer at: http://earthexplorer.usgs.gov Delivery Times can be found at: http://eros.usgs.gov/#/About_Us/Customer_Service/Delivery_Times NaN Native or GeoTiff Dataset searching and ordering capabilities are available though EarthExplorer at: http://earthexplorer.usgs.gov Horizontal Positional Accuracy The DOQ horizontal positional accuracy and the assurance of that accuracy depend, in part, on the accuracy of the data inputs to the rectification process. These inputs consist of the digital elevation model (DEM), aerotriangulation control and methods, the photo source camera calibration, scanner calibration, and aerial photographs that meet National Aerial Photography Program (NAPP) standards. Field control is acquired by third order class 1 or better survey methods sufficiently spaced to meet National Map Accuracy Standards for 1:12,000-scale products. Aerial cameras have current certification from the USGS, National Mapping Division, Optical Science Laboratory. Test calibration scans are performed on all source photography scanners. Vertical Positional Accuracy meters The vertical accuracy of the verified USGS format DEM is equivalent to or better than a USGS level-1 or -2 DEM. 7 All DOQ images are visually inspected for completeness to ensure that no gaps or image misplacement exists in the image area or in overedge coverage. The DOQ images may be derived by mosaicking multiple images, in order to insure complete coverage. All DOQs are cloud free. Some clouds may, very infrequently, be encountered only in the overedge coverage. Source photography is leaf-off in deciduous vegetation regions. Void areas may exist, having a radiometric value of zero and appearing black. These voids are areas for which no photographic source is available or are the result of image transformation from other planimetric systems to the UTM projection. In the latter case, the void sliver areas are on the outside edges of the overedge area. The data set field content of each DOQ header record element is validated to assure completeness prior to archiving in the Sales Data Base. All DOQ images are visually inspected for completeness to ensure that no gaps or image misplacement exists in the image area or in overedge coverage. The DOQ images may be derived by mosaicking multiple images, in order to insure complete coverage. All DOQs are cloud free. Some clouds may, very infrequently, be encountered only in the overedge coverage. Source photography is leaf-off in deciduous vegetation regions. Void areas may exist, having a radiometric value of zero and appearing black. These voids are areas for which no photographic source is available or are the result of image transformation from other planimetric systems to the UTM projection. In the latter case, the void sliver areas are on the outside edges of the overedge area. The data set field content of each DOQ header record element is validated to assure completeness prior to archiving in the Sales Data Base. All DOQ header data and image file sizes are validated by Tape Validation System (TVS) software prior to archiving in the Sales Data Base. This validation procedure assures correct physical format and field values for header record elements. Logical relationships between header record elements are tested. Quantitative Attribute Accuracy Assessment The DOQ root-mean-square-error (RMSE) is the square root of the average of the squared discrepancies. These discrepancies are the differences in coordinate (x and y) values derived by comparing the data being tested with values determined during aerotriangulation or by an independent survey of higher accuracy. During photographic reproduction of the source photography, limited analog dodging is performed to improve image quality. Analog dodging consists of holding back light from certain areas of the sensitized photographic material to avoid overexposure. The diapositive is inspected to insure clarity and radiometric uniformity. Diapositive image brightness values are collected with a minimum of image quality manipulation. Image brightness values may deviate from brightness values of the original imagery due to image value interpolation during the scanning and rectification processes. Radiometry is verified by visually inspecting the DOQs to the original unrectified image to determine if the DOQ has the same image quality or better image quality than the original unrectified input image. Slight systematic and radiometric differences can be detected between adjacent DOQ files due primarily to differences in source photography capture dates and Sun angles of aerial photography along flight lines. These differences can be observed in an image's general lightness or darkness when compared to adjacent DOQ file coverages. 7.0 meters RMSE To produce a DOQ requires (1) a minimum of three ground positions that can be identified on the photograph to be rectified, (2) camera calibration parameters, such as the calibrated focal length and the coordinates of the camera fiducials, (3) a digital elevation model (DEM), and (4) a digital image produced by scanning an aerial photograph with a precise, high-resolution scanner.The digital image is rectified to generate an orthophoto by processing requirements 1 through 3 above for each image picture element (pixel), using rigorous photogrammetric equations on a computer. The finished product is a spatially accurate image with planimetric features represented in their true geographic positions. NAPP Source Contribution: Elevation data in the form of an ortho-DEM regridded to user-specified intervals and bounds.cartridge tape Source Contribution: Panchromatic black and white (or color infrared) NAPP or NAPP-like photograph. The NAPP photographs are centered on the DOQ coverage area.cartridge tape Source Contribution: Horizontal and vertical control used to establish positions and elevations for reference and correlation purposes. Various media Source Contribution: camera calibration parametersdisc, paper 40000 265717 DEM1 UNKNOWN publication U.S. Geological Survey resourceProvider mapDigital NAPP 7824 159 PHOTO1 Unknown publication U.S. Geological Survey resourceProvider imageDigital project ground and photo control CONTROL_INPUT Unpublished material publication U.S. Geological Survey resourceProvider imageDigital Report of calibration CAMERA_INPUT Unpublished material publication U.S. Geological Survey resourceProvider imageDigital ground condition ground condition ground condition Date of camera calibration associated with the source photography Metadata Access Constraints: None Metadata Use Constraints: None None None This metadata was automatically generated from the Content Standard for Digital Geospatial Metadatastandard version FGDC-STD-001-1998, Version 2.0. U.S. Geological Survey Earth Resources Observation and Science (EROS) Center 703 648 4543 U.S. Geological Survey Earth Resources Observation and Science (EROS) Center 47914 252nd Street Sioux Falls SD 57198 USA lta@usgs.gov 0800 - 1600 CT, M-F custodian