53159 Data Set Published / External 50700 2017 NOAA NGS Ortho-rectified Mean High Water Color Mosaic of Western Cook Inlet, Alaska Data Set Completed 2018-08-17 This data set consists of 0.3-meter pixel resolution, 4-band orthoimages covering the project area. 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 3,000-meter x 3,000-meter block on the ground. There is no image overlap between adjacent files. 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. Aerial imagery was acquired using a Zeiss/Intergraph Digital Frame camera (DMC IIe) with a flight design that included a total of 843 exposures in 34 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 16,175' above mean terrain for 0.3 m imagery. Theme ISO 19115 Topic Category imageryBaseMapsEarthCover Spatial Global Change Master Directory (GCMD) Location Keywords CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > SOUTH CAROLINA Instrument Global Change Master Directory (GCMD) Instrument Keywords CAMERAS Platform Global Change Master Directory (GCMD) Platform Keywords AERIAL PHOTOGRAPHS > AERIAL PHOTOGRAPHS Platform Global Change Master Directory (GCMD) Platform Keywords Airplane > Airplane Theme NOS Data Explorer Topic Category Remotely Sensed Imagery/Photography Theme aerial Theme digital orthophotography Theme mosaic Theme orthophoto Theme photograph Theme rectified image Theme shoreline Temporal 20161230 Temporal 20170303 Office for Coastal Management Charleston SC USA Data Set Imagery None Planned Image (digital) Users must assume responsibility to determine the usability of these data. These photographs were obtained for use by NGS during the course of its development of potential final products to fulfill its statutory mission. Although NGS is making these photographs available to others who may find the photographs of value, NGS does not warrant, endorse, or recommend the use of these photographs for any given purpose. NGS is providing these photographs "as is," and NGS disclaims any and all warranties, whether expressed or implied, including (without limitation) any implied warranties of merchantability or fitness for a particular purpose. In no event will NGS be liable to you or any third party for any direct, indirect, incidental, consequential, special, or exemplary damages or lost profits resulting from any use or misuse of these data. Any conclusions drawn from the analysis of this information are not the responsibility of NOAA, the National Geodetic Survey, the Office for Coastal Management, or its partners. NOAA National Geodetic Survey Data Steward 2018-07-30 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 2018-07-30 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 2018-07-30 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 Originator 2018-07-30 Organization NGS Communications and Outreach Branch ngs.infocenter@noaa.gov (301) 713-3242 (301) 713-4172 Point of Contact 2018-07-30 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 Imagery covers the areas along the coast -81.15 -79.0544 33.2801 31.8361 Range 2016-10-10 2017-02-19 Unclassified Data is available online for custom downloads None Users should be aware that temporal changes may have occurred since this data set was collected and 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. https://coast.noaa.gov/dataviewer/#/imagery/search/where:ID=8582 2018-07-30 Organization NOAA Office for Coastal Management Link to custom download Not Applicable Zip https://coastalimagery.blob.core.windows.net/digitalcoast/CoastalSC_2017_8582/index.html 2018-07-30 Organization NOAA Office for Coastal Management Link to bulk image download GeoTIFF https://coast.noaa.gov Online Resource HTML Web page for the NOAA Office for Coastal Management https://coast.noaa.gov/dataregistry Online Resource HTML Web page for Digital Coast for finding coastal data https://coast.noaa.gov/dataviewer Online Resource HTML Data Access Viewer for discovering coastal imagery, land cover, and elevation data The project specifications require that horizontal be computed for orthoimagery files. The required accuracy is: 0.6 meters RMSEx and RMSEy, derived according to NSSDA. The RMSEx and RMSEy were tested with 62 of 79 checkpoints; 17 points were not used as they fell on obscured, damaged, or ambiguous locations. The checkpoints were distributed throughout the project area and were surveyed using GPS techniques. Values from the orthoimagery were measured for the x,y location of each check point. Horizontal positions interpolated from the orthoimagery were then compared to the horizontal values of the surveyed control points. Accuracy has been tested to meet 0.6 meters or better as defined by the National Standards for Spatial Data Accuracy (NSSDA). Tested 0.305 meters RMSEx as defined by the National Standards for Spatial Data Accuracy (NSSDA). The RMSEx of the orthoimage was calculated using 62 checkpoints. Tested 0.38 meters RMSEy as defined by the National Standards for Spatial Data Accuracy (NSSDA). The RMSEy of the orthoimage was calculated using 62 checkpoints. Acquisition and Processing Organization Quantum Spatial, Inc Originator 1 Digital aerial imagery was obtained using a large format Z/I Digital Mapping Camera system (DMC IIe) equipped with Airborne GPS/IMU covering the AOI. A total of 34 flight lines with 843 frames were collected in winter/spring of 2016/2017 in multi-spectral (RGB and NIR) 16 bits per band format. The imagery was acquired with a 92 mm focal length at an altitude above mean terrain of 16,175' to yield a raw pixel resolution of 0.30 m. The imagery was collected during leaf off conditions in late 2016/early 2017 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 20 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. Organization National Geodetic Survey NGS https://ror.org/02f762h70 1315 East-West Hwy Silver Spring MD 20910 https://geodesy.noaa.gov/ 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. Organization National Geodetic Survey NGS https://ror.org/02f762h70 1315 East-West Hwy Silver Spring MD 20910 https://geodesy.noaa.gov/ 3 Utilizing all four bands [blue (B), green (G), red(R) and near infrared (IR)] digital orthorectification was performed using algorithms resulting in a spatial and radiometric transformation of the digital image from line/sample space into UTM Zone 17. The interior and exterior orientation parameters were used to project each pixel into the ground coordinate system, while the ortho grade DEM 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 3,000-meter x 3,000-meter tiling scheme consisting of 544 individual ortho tiles. Delivery included digital ortho photos at a 0.30-meter pixel ground sample distance in 8 bit, 4 band (RGB and NIR) uncompressed GeoTIFF. The ortho photos meet a horizontal accuracy of +/- 0.60 meters or less RMSEx/RMSEy when compared to higher accuracy check points based on NSSDA testing standards. Organization National Geodetic Survey NGS https://ror.org/02f762h70 1315 East-West Hwy Silver Spring MD 20910 https://geodesy.noaa.gov/ gov.noaa.nmfs.inport:53159 Maryellen Sault 2018-07-30T13:23:08 SysAdmin InPortAdmin 2026-03-04T19:17:17 2024-01-11 National Geodetic Survey NGS 1002 Public No No 2020-03-13 1 Year 2021-03-13