Item talk:Q56134
From geokb
{
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"name": "System characterization report on the Gaofen-1",
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"value": "10.3133/ofr20211030B",
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"datePublished": "2021",
"dateModified": "2021-07-26",
"abstract": "Executive SummaryThis report addresses system characterization of Gaofen-1 and is part of a series of system characterization reports produced and delivered by the U.S. Geological Survey Earth Resources Observation and Science Cal/Val Center of Excellence in 2020. These reports present the detail methodology and procedures for characterization; present technical and operational information about the specific sensing system being evaluated; and provide a summary of test measurements, data retention practices, data analysis results, and conclusions.Gaofen represents a series of Chinese high-resolution Earth observation satellites. More than 12 satellites have been launched in the Gaofen series, beginning with Gaofen-1 in 2013. Satellites within the series have varying infrared, radar, and optical imaging capabilities. The primary goal for the satellite is to provide near real-time observations for climate change monitoring, geographical mapping, precision agriculture support, environmental and resource surveying, and disaster prevention. More information on Chinese satellites and sensors is available within the \u201c2020 Joint Agency Commercial Imagery Evaluation\u2014Remote Sensing Satellite Compendium\u201d and at http://www.cnsageo.com/#/detailIndex?secondIndex=2&id=3&code=8.The Earth Resources Observation and Science Cal/Val Center of Excellence System Characterization team completed data analyses to characterize the geometric (interior and exterior), radiometric, and spatial performances. Results of these analyses indicate that Gaofen-1 has an interior geometric performance of \u22120.48 meter (m) (\u22120.03 pixel) northing and 0.42 m (0.03 pixel) easting offset for band 1, \u22120.99 m (\u22120.06 pixel) northing and \u22120.38 m (\u22120.02 pixel) easting offset for band 2, \u22120.45 m (\u22120.03) northing and 0.83 m (0.05 pixel) easting offset for band 3, \u22123.20 m (\u22120.20 pixel) northing and 1.44 m (0.09 pixel) easting offset for band 4 in band-to-band registration. Similarly, Gaofen-1 has an exterior geometric performance of 7.50 m (0.48 pixel) easting and 109.50 m (7.30 pixels) northing offset in comparison to the Landsat 8 Operational Land Imager; a radiometric performance in the range of \u22120.014 to 0.149 (absolute reflective difference); and a spatial performance in the range of 1.1 to 2.0 pixels at full width at half maximum, with a modulation transfer function at a Nyquist frequency in the range of 0.040 to 0.250.",
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