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Soil Moisture, Crop and Vegetation Study Using AirSAR Data

Dr. Flaviana Hilario (1)and Dr. Juliet Mangera(2)

(1) PAGASA (Weather Bureau), ATB 1424 Quezon Ave, Quezon City, Philippines, 1100, Philippines
(2) Bureau of Soil and Water Management, ATB 1424 Quezon Ave, Quezon City, Philippines


The use of remote sensing in monitoring rice production has been extensively done using optical sensors. The Philippines being located in the tropical region is perennially covered with clouds; hence, the use of optical sensors is not practical. The synthetic aperture radar (SAR) with its cloud penetrating capability could be very useful for rice crop monitoring. In November 1996, The DC-8 aircraft which operates in full polarimetric mode at C-band (5.6 cm), L-band (24 cm) and P-band (68 cm) flew over Central Philippines with the AIRSAR system on board with spatial resolution of about 10 meters. The main objective of the study is to determine of the usefulness of radar data in distinguishing the different stages of rice growth in some parts of Iloilo, a major rice growing area in the Visayas. The results of the study showed that the C-, L- and P-band AirSAR images are capable of distinguishing the various stages of rice growth. The use of P-band to determine soil moisture also showed promising results. However, further studies are needed and emphasis must be given on the simultaneous acquisition of ground truth data for quantitative analysis.


Full paper


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