Abstract
The Japanese ALOS-2 satellite was launched on May 24<sup>th</sup>, 2014. It has the L-band SAR, PALSAR-2. Kim,Y. and van Zyl, J.J. proposed a kind of Radar Vegetation Index (RVI) as RVI = 8 * σ<sup>0</sup><sub>hv</sub> / (σ<sup>0</sup><sub>hh</sub> + σ<sup>0</sup><sub>vv</sub> + 2* σ<sup>0</sup><sub>hv</sub>) by L-band full-polarimetric radar data. Kim, Y. and Jackson, T.J., et al. applied the equation into rice and soybean by multi-frequency polarimetric scatterometer above 4.16 meters from the ground. Their report showed the L-band was the most promising wave length for estimating LAI and NDVI from RVI. The author tried to apply the analysis to the actual paddy field areas, both Inashiki region and Miyagi region in the eastern main island, “Honshu”, areas of Japan by ALOS-2/PALSAR-2 full-polarimetry data in the summer season, the main crop growing time, of 2015. Judging from conventional methods, it will be possible to discriminate paddy rice growing fields from reaped fields or the other crops growing fields by the PALSAR-2 data. But the RVI value is vaguely related to such land use or biomass at the present preliminary experiment. The continuous research by the additional PALSAR-2 full-polarimetry data should be desired.
Highlights
Most of the earth-observation-satellite in operating are the satellite equipped with SAR sensors
As SAR data of earth surface can be obtained in case of cloudy weather, this is an advantage of agricultural applications, such as crop species recognition or estimation of crop biomass
Radar Vegetation Index (RVI) = 4*min(λ 1, λ 2, λ 3) / (λ 1 + λ 2 + λ 3) They modified the equation as follows. (2009) RVI = 8 * σ 0 hv / (σ 0hh + σ 0 vv +σ 0 hv ) by L-band full-polarimetric SAR data. They applied it into rice crop and soybean. (Kim, Jackson et al, 2012) Their experiment was performed by the L-band full polarization sensor above the field collecting data every 10 minutes during the crop grown season
Summary
Most of the earth-observation-satellite in operating are the satellite equipped with SAR sensors. Japanese SAR satellites are the L-band SAR. As its polarization is only HH polarization and its wave length is rather long, the estimation of paddy-rice-planting-area is only for practical use. As SAR data of earth surface can be obtained in case of cloudy weather, this is an advantage of agricultural applications, such as crop species recognition or estimation of crop biomass. All-weather data collection characteristic using the L-band SAR is important for agricultural applications
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