Fig. 6

(a) Example of the observed image (Mid-Alt observation, 16:05:20) and (b) the anticipated image using TPM-1 (Takita et al. 2017) using the shape model of SFM 800k v20180804. These temperature ranges are set to emphasize the hot regions of the Ejima Saxum and the Otohime Saxum. The simulated temperature of this TPM-1 corrected apparent temperature due to the observed position of TIR using Eq. (3). The parameters were assumed to be an emissivity of 1.0, an albedo of 0.045 (Sugita et al. 2019), and thermal inertia of 350 Jm\(^{-2}\)s\(^{-0.5}\)K\(^{-1}\), including the model of solar ray scatterings and secondary radiations between surrounding terrains. Although the simulated temperature was derived using the high-definition shape model (800k), TPM-1 did not reproduce the globally homogeneous temperature as the observed temperature. This difference is probably caused by surface roughness effects, where roughness was probably much smaller than the pixel scale of TIR