Classification and Evaluation of Extended PICS (EPICS) on a Global Scale for Calibration and Stability Monitoring of Optical Satellite Sensors

被引:10
作者
Rueda, Juliana Fajardo [1 ]
Leigh, Larry [2 ]
Pinto, Cibele Teixeira [2 ]
Kaewmanee, Morakot [2 ]
Helder, Dennis [2 ]
机构
[1] South Dakota State Univ SDSU, Dept Elect Engn & Comp Sci, Brookings, SD 57007 USA
[2] South Dakota State Univ SDSU, Image Proc Lab, Engn Off Res, Brookings, SD 57007 USA
关键词
global land cover classification; pseudo invariant calibration site (PICS); extended pseudo invariant calibration site (EPICS); stability monitoring; radiometric calibration; RADIOMETRIC CALIBRATION; SITES;
D O I
10.3390/rs13173350
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Historically stable areas across North Africa, known as pseudo invariant calibration sites (PICS), have been used as targets for the calibration and monitoring of optical satellite sensors. However, two major drawbacks exist for these sites: first is the dependency on a single location to be always invariant, and second is the limited amount of observation achieved using these sites. As a result, longer time periods are necessary to construct a dense dataset to assess the radiometric performance of on-orbit optical sensors and confirm that the change detected is sensor-specific rather than site-specific. This work presents a global land cover classification to obtain an extended pseudo invariant calibration site (EPICS) on a global scale using Landsat-8 Operational Land Imager (OLI) data. This technique provides multiple calibration sites across the globe, allowing for the building of richer datasets in a shorter time frame compared to the traditional approach (PICS), with the advantage of assessing the calibration and stability of the sensors faster, detecting possible changes sooner and correcting them accordingly. This work identified 23 World Reference System two (WRS-2) path/row locations around the globe as part of the global EPICS. These EPICS have the advantage of achieving multiple observations per day, with similar spectral characteristics compared to traditional PICS, while still producing a temporal coefficient of variation (ratio of temporal standard deviation and temporal mean) less than 4% for all bands, with some as low as 2.7%.
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页数:27
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