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Synthetic Aperture Radar (SAR) is newest remote sensing technology that is not affected by meteorological conditions. This technology is particularly suitable for use in tropical regions such as Indonesia. In tropical peatland, Indonesia becomes the most important countries for peat areas and carbon stocks. However, this tropical peatland forest had been disturbed by fires, and become a national issue and an international issue. In disaster mitigation, identifying the existence of tropical peatland are needed. But this information is very limited. Therefore, we analysed backscattering value of VV and VH polarisation, and estimated dielectric constant from a dual-polarisation Sentinel-1A in Siak Regency, Riau Province, Indonesia. We also measured dielectric constant at four several types of land use (namely, forest, oil palm, shrubs, and agriculture) along with two types of peat conditions. Results indicated that the dielectric constant decreases as the land use become dry. Results show that the profiles of dielectric constant derived from dual-pol Sentinel-1A images have a high similarity to the direct approach using GPR, with a degree of similarity of 87.24%. The averaged dielectric constants of peat are lower than the peat in subtropics area and ranges between 41 and 68.

In Indonesia, forests fires particularly in tropical peatland have are a major problem unresolved. These conditions need a strong peatland management to control and reduce forest fires. Monitoring peatland conditions are crucial for the actions. Additionally, Synthetic Aperture Radar (SAR) images have wide applications in remote sensing and mapping. It utilized area when meteorological conditions are not suitable for acquirement of optical data. In this research, we used a dual-pol (VV and VH) Sentinel-1A and estimated soil moisture of peat in Siak Regency, Riau Province, Indonesia using a modified Dubois Inversion. At the site, soil moisture at the four selected segments (namely, A1, A2, D1 and J1) are also measured in May 2017. Results show that the peatland areas have a ratio of polarimetric features (VH/VV) of 1.5 to 1.6.

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