U.S. Geological Survey Unpublished Material Report of Calibration Remote-Sensing Image U.S. Geological Survey Menlo Park, CA USA https://doi.org/10.5066/F7125QVD Orthophotos combine the image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 overage ranges from a minimum of 50 meters to a maximum of 300 meters beyond the extremes of the primary and secondary corner points. The overage 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. For further information on USGS Maps, see: https://www.usgs.gov/science-explorer-results?es=maps Ground Condition Unknown Present 19950812 In Work Sporadic -111.1875 44.625 -111.125 44.5625 44.5625 -111.1875 1-Meter Orthophoto Digital Orthophotoquad DOQQ 7.5- x 7.5-Minute Orthophoto 2-Meter Orthophoto Quarter-Quadrangle Orthophoto Rectified Photograph Digital Image Map DOQ Orthophoto Digital Orthophoto Aerial Photograph 3.75- x 3.75-Minute Orthophoto none Mexico U.S. Department of Commerce, 1995, Countries, dependencies, areas of special sovereignty, and their principal administrative divisions, Federal Information Processing Standard 10-4, Washington, D.C., National Institute of Standards and Technology. Any downloading and use of these data signifies a user's agreement to comprehension and compliance of the USGS Standard Disclaimer. Insure all portions of metadata are read and clearly understood before using these data in order to protect both user and USGS interests. There is no guarantee of warranty concerning the accuracy of these data. Users should not use these data for critical applications without a full awareness of their limitations. Temporal changes may have occurred since the data were collected and some parts of these data may no longer represent actual surface conditions. There are no restrictions regarding the use of data distributed by the U.S. Geological Survey (USGS), unless expressly identified prior to or at the time of receipt. We request the following statement be used: Data available from the U.S. Geological Survey. Please refer to https://lta.cr.usgs.gov/ee_help_data_citation for more information on data citation. custserv@usgs.gov U.S. Geological Survey Earth Resources Observation and Science (EROS) Center Customer Service Representative Mailing and Physical Address
U.S. Geological Survey (USGS) Earth Resources Observation and Science (EROS) Center 47914 252nd Street
Sioux Falls SD 57198 USA 605-594-6589 605-594-6151 1-800-252-4547 custserv@usgs.gov 0800 - 1600 CT, M-F, GMT custserv@usgs.gov This is a compressed and resampled version of the data set of interest to help validate area of interest, data quality, and the impact of cloud cover, if it exists. Browse graphic for: https://earthexplorer.usgs.gov/browse/doq_qq/R/reas_pass_MT/O4411131.NES.831822.jpg JPEG Unclassified None None Oracle Remote-Sensing Image https://doi.org/10.5066/F7125QVD U.S. Geological Survey Unpublished Material U.S. Geological Survey Menlo Park, CA USA Report of Calibration Radiometry is verified by visual inspection of the photo image. Slight systematic radiometric differences may exist between adjacent 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 file coverages. Tonal balancing may be performed over a group of images during a mosaicing process which may serve to lighten or darken adjacent images to improve their tone. 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. 7.0 meters RMSE 0 Percent All DOQ images are visually inspected for completeness to ensure that no gaps or image misplacement exists in the iimage 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. custserv@usgs.gov U.S. Geological Survey Earth Resources Observation and Science (EROS) Center Customer Service Representative Mailing and Physical Address
U.S. Geological Survey (USGS) Earth Resources Observation and Science (EROS) Center 47914 252nd Street
Sioux Falls SD 57198 USA 605-594-6589 605-594-6151 custserv@usgs.gov 1-800-252-4547 0800 - 1600 CT, M-F, GMT custserv@usgs.gov 1998-04-30 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 CAMERA_INPUT Remote-Sensing Image https://doi.org/10.5066/F7125QVD U.S. Geological Survey Unpublished Material U.S. Geological Survey Menlo Park, CA USA Report of Calibration Camera Calibration Parameters 40000 Date of camera calibration associated with the source photography Unknown Present 19950812 Disc, Paper 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. 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. Meters 7 The vertical accuracy of the verified USGS format DEM is equivalent to or better than a USGS level-1 or -2 DEM. Raster 5639 7563 pixel 297.257 Geodetic Reference System 80 North American Datum 1983 6378137 Universal Transverse Mercator 0 0 0.0 -123 00 00 .09996 19 0 0 1 1 Row and Column Meters 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 digiital 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. Unknown Present 19950812 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. custserv@usgs.gov U.S. Geological Survey Earth Resources Observation and Science (EROS) Center Customer Service Representative Mailing and Physical Address
U.S. Geological Survey (USGS) Earth Resources Observation and Science (EROS) Center 47914 252nd Street
Sioux Falls SD 57198 USA 605-594-6151 605-594-6589 custserv@usgs.gov 0800 - 1600 CT, M-F, GMT custserv@usgs.gov 1-800-252-4547 Typically, all data available from USGS/EROS are downloadable at no cost to the user. There are some cases when a service fee is required to convert the analog film record to a digital file. 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. USGS_DOQ Optional (Native) or GeoTIFF 4-6 Native or GeoTiff https://earthexplorer.usgs.gov A majority of the data are available for immediate downloading. Adequate computer capability is the only technical prerequisite for viewing data in digital form. 20050301 None custserv@usgs.gov U.S. Geological Survey Earth Resources Observation and Science (EROS) Center Customer Service Representative Mailing and Physical Address Sioux Falls
U.S. Geological Survey (USGS) Earth Resources Observation and Science (EROS) Center 47914 252nd Street
SD 57198 USA 605-594-6589 605-594-6151 custserv@usgs.gov 0800 - 1600 CT, M-F, GMT custserv@usgs.gov 1-800-252-4547 20000801 Unclassified None None Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998, Version 2.0 Local Time None