The Polarimetric L-Band Imaging Synthetic Aperture Radar (PLIS): Description, Calibration, and Cross-Validation
| Autor: | Jeffrey P. Walker, Xiaoling Wu, Mihai A. Tanase, Alvin S. Goh, Liujun Zhu, Nan Ye, N.J.S. Stacy, Rocco Panciera, Heath Yardley, Douglas A. Gray, Christoph Rudiger, Jorg M. Hacker, Jim Mead |
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| Rok vydání: | 2018 |
| Předmět: |
Synthetic aperture radar
Atmospheric Science 010504 meteorology & atmospheric sciences Backscatter 0211 other engineering and technologies Polarimetry 02 engineering and technology 01 natural sciences Standard deviation law.invention Passive radar law Calibration Computers in Earth Sciences Radar Image resolution Geology 021101 geological & geomatics engineering 0105 earth and related environmental sciences Remote sensing |
| Zdroj: | IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing. 11:4513-4525 |
| ISSN: | 2151-1535 1939-1404 |
| Popis: | The polarimetric L-band imaging synthetic aperture radar (PLIS) is a high spatial resolution (better than 6 m) airborne synthetic aperture radar system that has been dedicated to scientific research into civilian applications since 2010. The weight of PLIS is ∼38 kg, allowing it to be installed aboard small low-cost aircraft, with two antennas used to measure the full backscatter matrix for a swath between 15° and 50° on each side of the flight direction. Calibration based on a total of 96 calibration points and a homogeneous forest during the two recent soil moisture active passive experiments (SMAPEx-4 and 5) showed an overall radiometric accuracy of 0.58 dB (root-mean-square error) over trihedral passive radar calibrators. Independent evaluation based on polarimetric active radar calibrators showed an amplitude imbalance of 0.17 dB with a standard deviation of 0.15 dB and a phase imbalance of 3.87° with a standard deviation of 2.86°. Two calibrated phased-array L-Band synthetic aperture radar-2 (PALSAR-2) images with different observation modes (ScanSAR and Stripmap) were compared with the calibrated PLIS images. The agreement between PALSAR-2 Stripmap and PLIS had a root mean square difference of 1.27 dB and a correlation coefficient of 0.87. Further comparisons over different landcover types confirmed that homogeneous forest and grassland areas constitute optimal targets for cross-validation and/or calibration. |
| Databáze: | OpenAIRE |
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