The synthetic aperture radar (SAR) offset tracking method is extensively employed to accurately measure significant surface displacements resulting from phenomena such as glacier melting, volcanic eruptions, and earthquakes, particularly when the interferometric phase lacks coherence. However, a trade-off exists between the resolution and accuracy of SAR offset tracking, determined by the selected kernel sizes. Hence, choosing optimal kernel sizes is crucial in the application of this method. In this study, we applied SAR offset tracking with a coarse-to-fine strategy, applying the kernel sizes coarsely and then fine. This approach allows for improved observational precision while maintaining resolution compared to general single-kernel offset tracking results. Applying this technique to SAR imagery from KOMPSAT-5, a South Korean X-band SAR satellite, enabled the precise observation of surface displacements caused by the melting of the Campbell Glacier in the East Antarctic and the 2023 Turkey-Syria earthquake. This marks the first instance of large-scale surface displacement observations using KOMPSAT-5 SAR imagery, affirming the effectiveness of the SAR offset tracking technique for precise land surface displacement observations with KOMPSAT-5 SAR imagery.
In this study, we apply time-series interferometric synthetic aperture radar (InSAR) technique to Korea multi-purpose satellite-5 (KOMPSAT-5) images to analyze surface deformation. Experimental results obtained using the small baseline subset (SBAS) technique expressively represent large crucial movements due to volcanic eruption in 2018 as well as long-period surface deformation trends.
The Republic of Korea is presently operating the KOMPSAT-5 Synthetic Aperture Radar (SAR) satellite and intends to launch the KOMPSAT-6 SAR satellite and a constellation system of micro-SAR satellites in the future. Therefore, the demand for SAR satellite information is increasing in various fields, but many public and private users who use national satellite information in practice use Electro-Optical and Infrared (EO/IR) satellite images. In this research, an independent KOMPSAT-5 SAR imagery analysis tool for Automatic Change Detection and Cueing (ACDC) was developed to promote the utilization of domestic SAR satellite information by practitioners in public sector organizations in Korea. For the development of SAR ACDC, the functions required for each processing step were analyzed in detail, and this was implemented as a proto-type tool. Algorithms that are the basis of the KOMPSAT-5 ACDC, for example, KOMPSAT-5 SAR image import, metadata comparison, SAR noise removal filtering, image co-registration, and change image generation, etc. were implemented. Moreover, the proto-type tool was developed so that users can use it correctly and conveniently by supporting an actual user-friendly interface. The ACDC algorithms and the tool are anticipated to be used in the future by users who use Korea's national satellite data for early detection of illegal ships and structures, as well as confirmation of wide-area disaster damage.
The Compact Airborne Imaging Spectrometer System (CAISS) was designed and developed as the airborne
hyperspectral imaging system. The mission of the CAISS is to provide full contiguous spectral information with high
spatial resolution for advanced applications in the field of remote sensing. The CAISS has an ability to control the
spectral and spatial configuration of the imaging instruments. In order to understand the mechanism of imaging
spectrometer system and its characteristics, the several verification tests with the CAISS were conducted in the
laboratory. Especially, the verification of camera system was performed with the integrating sphere and spectral lamps.
In order to verify the spectral characteristics, four spectral binning (x1, x2, x4, and x8) were measured using each of the
spectral lamps and the position of the peaks was compared to the reference data sheet of each spectral lamps. For all
measurements, it was found that the spectral deviation was lower than the Full Width Half Maximum (FWHM) of the
system for each of the spectral binning. Also several interface verification tests between the CAISS and the airplane were
conducted on the ground. This paper presents the preliminary results of verification test in the camera system level and
interface test with airplane on the ground.
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