This data set contains high-resolution QuickBird imagery and geospatial data for the entire Barrow QuickBird image area (156.15Â° W - 157.07Â° W, 71.15Â° N - 71.41Â° N) and Barrow B4 Quadrangle (156.29Â° W - 156.89Â° W, 71.25Â° N - 71.40Â° N), for use in Geographic Information Systems (GIS) and remote sensing software. The original QuickBird data sets were acquired by DigitalGlobe from 1 to 2 ... August 2002, and consist of orthorectified satellite imagery. Federal Geographic Data Committee (FGDC)-compliant metadata for all value-added data sets are provided in text, HTML, and XML formats. Accessory layers include: 1:250,000- and 1:63,360-scale USGS Digital Raster Graphic (DRG) mosaic images (GeoTIFF format); 1:250,000- and 1:63,360-scale USGS quadrangle index maps (ESRI Shapefile format); an index map for the 62 QuickBird tiles (ESRI Shapefile format); and a simple polygon layer of the extent of the Barrow QuickBird image area and the Barrow B4 quadrangle area (ESRI Shapefile format). Unmodified QuickBird data comprise 62 data tiles in Universal Transverse Mercator (UTM) Zone 4 in GeoTIFF format. Standard release files describing the QuickBird data are included, along with the DigitalGlobe license agreement and product handbooks. The baseline geospatial data support education, outreach, and multi-disciplinary research of environmental change in Barrow, which is an area of focused scientific interest. Data are provided on four DVDs. This product is available only to investigators funded specifically from the National Science Foundation (NSF), Office of Polar Programs (OPP), Arctic Sciences Section. An NSF OPP award number must be provided when ordering this data.
Quality checks were performed throughout all processing procedures. Z-profiles for multispectral tiles were viewed for various locations in the image. Vegetation, water features and human-made features were checked for correct radiometric values. Actual digital number (DN) values were checked for individual tiles and for corresponding areas in the mosaics. Pixel registration of panchromatic and ... multispectral tiles were checked. The Barrow orthoimagery location accuracy is defined as custom; the investigator team supplied the digital elevation model (DEM) and ground control points (GCPs). Imagery meets and usually exceeds QuickBird's specifications for 1:12,000 scale orthoimagery, which is defined as 10.2 meters CE90% and 6.2 meters root-mean-square error. Radiometric, sensor, and geometric corrections were applied to separate images by DigitalGlobe and images were mapped to a cartographic projection using a digital elevation model (DEM) to correct parallax error due to local topographic relief. Each image has a different location accuracy. See the PDF file 'Barrow QuickBird Quality Assessment Report.pdf' (distributed with the data) for GCPs used to geocorrect imagery, correction errors, and other issues related to quality control.
Data are available on four DVDs and are restricted to NSF OPP Arctric Sciences Section-funded investigators. To place an order, visit the NSIDC catalog description (http://nsidc.org/data/arcss304.html) for this data set. Click 'Register for Data' and read the license agreement. Scroll to the end of the agreement to accept it. You will be directed to a registration form; please complete this and provide your most recent NSF OPP grant number. NSIDC User Services will verify the grant number and contact you soon with an order confirmation. Reduced-resolution (http://nsidc.org/data/arcss305.html) versions of these data are available to the general public.