Abstract
In this study, Cross calibration was conducted at the Libya 4 PICS site on 2015 using Landsat-8 and KOMPSAT-3A. Ideally a cross calibration should be calculated for each individual scene pair because on any given date the TOA spectral profile is influenced by sun and satellite view geometry and the atmospheric conditions. However, using the near-simultaneous images minimizes this effect because the sensors are viewing the same atmosphere. For the cross calibration, the calibration coefficient was calculated by comparing the at sensor spectral radiance for the same location calculated using the Landsat-8 calibration parameters in metadata and the DN of KOMPSAT-3A for the regions of interest (ROI). Cross calibration can be conducted because the satellite sensors used for overpass have a similar bandwidth. However, not all satellites have the same color filter transmittance and sensor reactivity, even though the purpose is to observe the visible bands. Therefore, the differences in the RSR should be corrected. For the cross-calibration, a calibration coefficient was calculated using the TOA radiance and KOMPSAT-3 DN of the Landsat-8 OLI overpassed at the Libya 4 Site, As a result, the accuracy of the calibration coefficient at the site was assumed to be ± 1.0%. In terms of the results, the radiometric calibration coefficients suggested here are thought to be useful for maintaining the optical quality of the KOMPSAT-3A.
Highlights
KOrea Multi-Purpose SATellite (KOMPSAT)-2 and -3 were commissioned to satisfy the demand for high-resolution satellite images in Korea
Cross calibration was conducted at the Libya 4 PICS site on 2015, using Landsat-8 and KOMPSAT-3 Three times (Figure 2 and Table 1)
The calibration coefficient was calculated by comparing the at sensor spectral radiance for the same location calculated using the Landsat-8 calibration parameters in metadata and the DN of KOMPSAT-3A for the regions of interest (ROI)
Summary
KOrea Multi-Purpose SATellite (KOMPSAT)-2 and -3 were commissioned to satisfy the demand for high-resolution satellite images in Korea. On March 26, 2015, KOMPSAT-3A was launched successfully, and Calibration and Validation (Cal/Val) began recently to improve image quality during the Launch and Early Operation Phase (LEOP). Cal/Val is divided into three parts: geometric, radiometric, and spatial. We report the results of the radiometric Cal/Val of the spectral application images. Post-launch in-flight calibration was conducted to promote the stable operation of KOMPSAT-3A during the LEOP. The main contributions of this paper are Cross calibration between the two sensors using simultaneous image pairs, acquired by these two sensors over the Libya 4 PICS site. The differences in spectral responses between KOMPSAT-3 and Landsat-8, we applied the SBAF using the EO-1 Hyperion
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