[S-TT59_29AM1] 合成開口レーダー

[STT59-04] 航空機搭載合成開口レーダーPiSAR2による立山の氷河観測-序報-

*古屋 正人¹、福井 幸太郎²、杉山 慎³、澤柿 教伸⁴ (1.北海道大学大学院理学研究院、2.立山カルデラ砂防博物館、3.北海道大学低温科学研究所、4.北海道大学環境科学研究院)

キーワード：合成開口レーダー, 氷河, 立山

Fukui and Iida (2012) reported that three snowy gorges at Tateyama, Japan, were flowing at a rate of 10-30 cm/month and hence could be identified as glaciers. Fukui and Iida's observations are based on ground-based GPS observations. Because glacier flow velocity data sets are one of the fundamental physical quantities to better understand the dynamics, conventional geodetic techniques have been applied, and the measurement accuracy has significantly improved. However, due to the severe environment and logistic problems, SAR-based velocity mapping has been performed with successful results at large glaciers and ice sheets over the past decades. The velocity mapping technique is so called pixel-offset (or feature) tracking. Thus, applying the same technique to the fore-mentioned newly discovered glaciers, we should also be able to detect the spatial distribution of glacier velocities. However, the presently available satellite-based SAR data set does not have enough spatial resolutions to resolve the velocities. In this regard, the 30-cm resolution of Pi-SAR2 seems promising to perform the pixel-offset tracking. Here we report the first observation images of the Japanese glaciers acquired by Pi-SAR2, and will discuss the preliminary report of velocity mapping.