48400 2014_grady_ga Data Set Published / External 47842 Imagery Project Completed 2014-12-16 This data set consists of one-foot pixel resolution, natural color orthoimages covering the urban area footprint. An orthoimage is remotely sensed image data in which displacement of features in the image caused by terrain relief and sensor orientation have been mathematically removed. Orthoimagery combines the image characteristics of a photograph with the geometric qualities of a map. Each orthoimage provides imagery over a 5000-foot by 5000-foot block on the ground. There is no image overlap between adjacent files. The projected coordinate system is Georgia State Plane West (FIPS 1002) feet with a NAD83 datum. This data depicts geographic features on the surface of the earth. It was created to provide easily accessible geospatial data which is readily available to enhance the capability of Federal, State, and local emergency responders, as well as storm water management and assessment. 11355 Theme Global Change Master Directory (GCMD) Science Keywords EARTH SCIENCE > SPECTRAL/ENGINEERING > INFRARED WAVELENGTHS > INFRARED IMAGERY Theme Global Change Master Directory (GCMD) Science Keywords EARTH SCIENCE > SPECTRAL/ENGINEERING > VISIBLE WAVELENGTHS > VISIBLE IMAGERY Theme ISO 19115 Topic Category imageryBaseMapsEarthCover Spatial Global Change Master Directory (GCMD) Location Keywords CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > GEORGIA Instrument Global Change Master Directory (GCMD) Instrument Keywords CAMERAS Platform Global Change Master Directory (GCMD) Platform Keywords Airplane > Airplane Theme 12 inch orthoimage Theme image map Theme natural color orthophoto Theme orthoimage Theme orthophoto Theme rectified image Theme rectified photograph Spatial U.S. Department of Commerce GA Spatial U.S. Department of Commerce US Office for Coastal Management Charleston SC Data Set Unknown Image (digital) Natural color orthoimagery is organized in three color bands or channels which represent the red, green, and blue (RGB) 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 coverage (all outside of the AOI) are represented with the numeric value of 0. U.S. Department of the Interior, U.S. Geological Survey, 1996, Standards for Digital Orthophotos: Reston, VA. Users must assume responsibility to determine the appropriate use of these data. DATA SHOULD NOT BE USED FOR LEGALLY BINDING APPLICATIONS. Photo Science, Inc. A Quantum Spatial Company flew and processed the data. Data Steward 2014-12-16 Organization NOAA Office for Coastal Management NOAA/OCM coastal.info@noaa.gov 2234 South Hobson Ave Charleston SC 29405-2413 (843) 740-1202 https://coast.noaa.gov NOAA Office for Coastal Management Home Page Online Resource Distributor 2014-12-16 Organization NOAA Office for Coastal Management NOAA/OCM coastal.info@noaa.gov 2234 South Hobson Ave Charleston SC 29405-2413 (843) 740-1202 https://coast.noaa.gov NOAA Office for Coastal Management Home Page Online Resource Metadata Contact 2014-12-16 Organization NOAA Office for Coastal Management NOAA/OCM coastal.info@noaa.gov 2234 South Hobson Ave Charleston SC 29405-2413 (843) 740-1202 https://coast.noaa.gov NOAA Office for Coastal Management Home Page Online Resource Point of Contact 2014-12-16 Organization NOAA Office for Coastal Management NOAA/OCM coastal.info@noaa.gov 2234 South Hobson Ave Charleston SC 29405-2413 (843) 740-1202 https://coast.noaa.gov NOAA Office for Coastal Management Home Page Online Resource Ground Condition -84.403 -84.049 31.091 30.668 Range 2014-01-22 2014-02-28 Yes Unclassified None 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 it's limitations. https://coast.noaa.gov/dataregistry/ Downloadable Data Erdas Imagine (.img) and TIFF / BigTIFF / GeoTIFF (.tif) IMG - ERDAS Imagine https://coast.noaa.gov/dataviewer/#/imagery/search/where:ID=4742 Customized Download Create custom data files by choosing area, map projection, file format, etc. https://coastalimagery.blob.core.windows.net/digitalcoast/GradyGA_2014_4742/index.html Bulk Download Simple download of data files. https://coast.noaa.gov/dataregistry Online Resource 2017-02-22 Date that the source FGDC record was last modified. 2017-11-14 Converted from FGDC CSDGM (version FGDC-STD-001-1998) using 'fgdc_to_inport_xml.pl' script. Contact Tyler Christensen (NOS) for details. 2018-02-08 Partial upload of Positional Accuracy fields only. 2018-03-13 Partial upload to move data access links to Distribution Info. ArcGIS 10; Microsoft Windows 7; Microsoft Office; Intergraph's suite of photogrammetric products including Z/I Inflight and GeoMedia OrthoPro 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. Ground Control Points will be measured in Accuracy Analyst in order to produce an accuracy report for each area. 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. Photography was flown during leaf-off in deciduous vegetation regions. Coastal areas and international boundary regions may have areas without images (void areas) in parts of the coverage. These void areas have a radiometric value of either zero (black) or 128 (uniform gray). All GeoTIFF tagged data and image file sizes are validated using commercial GIS software to ensure proper loading before being archived. This validation procedure ensures correct physical format and field values for tagged elements. Seamlines and tile edges are visually inspected. Seamline mismatches are not corrected unless the overall displacement exceeds one meter. Aerotriangulation Discrete 2014 Softcopy aerotriangulation was performed utilizing the airborne GPS/IMU data, GPS ground control and image coordinate measurements allowing the direct computation of the exterior orientation parameters for each image of the project. | Source Geospatial Form: model | Type of Source Media: CD-ROM GPS Photo Control Survey for Coastal Georgia 2014-01-01 Discrete 2014 Photo Science performed a geodetic control survey in support of a digital orthophoto production project covering the AOI. The survey was done using the Global Positioning System (GPS). A combination of photo identifiable objects and pre-flight targeting was used to provide ground based photo control. Photo control points have a combined local and network accuracy at 95% confidence of less than or equal to five (5) centimeters horizontally and vertically as determined by the residuals of the network adjustment. | Source Geospatial Form: Model | Type of Source Media: CD-ROM Georeferenced Single Frames 2014-12-16 Discrete 2014-01-22 Aerial imagery was acquired using a Zeiss/Intergraph Digital Frame camera (DMCii) with a flight design that included a total of 2446 exposures in 278 flight lines. Aerial imagery was supplemented with the simultaneous acquisition of airborne GPS/IMU data, which captured the ground coordinate for the nadir point of each photograph. Aerial imagery was exposed at an altitude of 10,000' above mean terrain for six inch imagery and 20,000' above mean terrain for one foot imagery. | Source Geospatial Form: remote-sensing image | Type of Source Media: external hard drive LiDAR DEM/DTM 2014-12-16 Discrete 2014 A compilation of topographic land form elevation datasets developed through photogrammetric data capture or through the use of existing elevation datasets from various sources for use in developing digital ortho imagery. | Source Geospatial Form: model | Type of Source Media: DVD 1 Digital aerial imagery was obtained using a large format Z/I Digital Mapping Camera system (DMCii) equipped with Airborne GPS/IMU covering the AOI. A total of 278 flight lines with 2446 frames were collected in early 2014 in multi-spectral (RGB and NIR) 16 bits per band format. The imagery was acquired with a 112mm focal length at an altitude above mean terrain of 10,000' to yield a raw pixel resolution of 6" and 20,000' to yield a raw pixel resolution of 1' suitable for photogrammetric mapping and orthophoto production. The imagery was collected during leaf off conditions in early 2014 under conditions free from clouds and cloud shadows, smoke, fog, haze, light streaks, snow, ice on water bodies, foliage, flooding, and excessive soil moisture. The sun angle threshold was 30 degrees. The imagery consisted of panchromatic, blue, green, red and near infrared bands. The three color bands and near infrared bands have been pan sharpened and archived as frame imagery. 2014-01-01T00:00:00 2 Ground based photo control points were established throughout the area of interest using a combination of conventional and GPS survey methods in order to support softcopy aerotriangulation and photogrammetric mapping meeting the accuracies specified in this Scope of Work. This control supplemented the exposure station control obtained from the onboard Airborne Global Positioning System (ABGPS) and Inertial Measurement Unit (IMU). Photo control points established for this project have a combined local and network accuracy at 95% confidence of less than or equal to five (5) centimeters horizontally and vertically as determined by the residuals of the network adjustment. 2014-01-01T00:00:00 3 Utilizing all four pan-sharpened bands [blue (B), green (G), red(R) and near infrared (IR)] digital orthorectification was performed using cubic convolution algorithms resulting in a spatial and radiometric transformation of the digital image from line/sample space into State Plane Zone 1002 Georgia West. The interior and exterior orientation parameters were used to project each pixel into the ground coordinate system, while the ortho grade DEM/DTM was used to correct for relief displacement. Radiometric correction software and techniques were used to create orthophoto files that minimize the appearance of image seams and without loss of feature signature. Orthophotos are checked for geometric accuracy, image quality and tonally balanced to produce a uniform contrast and tone across the entire project. The individual overlapping orthophoto frames were mosaicked together and the final tiles were extracted from the image set to a 5,000 x 5,000 foot tiling scheme consisting of 3,148 individual ortho tiles. Delivery included digital ortho photos at a 6" or 1' pixel ground sample distance in 8 bit, 4 band (RGB and NIR) uncompressed GeoTIFF and MrSID files. The ortho photos meet a horizontal accuracy of +/- 2.5-feet or less at 95% confidence level when compared to higher accuracy check points based on NSSDA testing standards. 2013-01-01T00:00:00 gov.noaa.nmfs.inport:48400 Anne Ball 2017-11-14T14:46:26 Brianna Key 2024-02-05T17:15:41 2024-02-05 Office for Coastal Management OCM 1002 Public No No 2018-03-13 1 Year 2019-03-13