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Title: Towards an operational sar-based rice monitoring system in Asia : Examples from 13 demonstration sites across Asia in the RIICE project
Authors: Nelson, Andrew
Setiyono, Tri
Rala, Arnel B.
Quicho, Emma D.
Raviz, Jeny V.
Abonete, Prosperidad J.
Maunahan, Aileen A.
Garcia, Cornelia A.
Bhatti, Hannah Zarah M.
Villano, Lorena S.
Thongbai, Pongmanee
Holecz, Francesco
Barbieri, Massimo
Collivignarelli, Francesco
Gatti, Luca
Quilang, Eduardo Jimmy P.
Mabalay, Mary Rose O.
Mabalot, Pristine E.
Barroga, Mabel I.
Bacong, Alfie P.
Detoito, Norlyn T.
Berja, Glorie Belle
Varquez, Frenciso
Kuntjoro, Dwi
Murdiyati, Sri Retno
Pazhanivelan, Sellaperumal
Kannan, Pandian
Mary, Petchimuthu Christy Nirmala
Subramanian, Elangovan
Rakwatin, Preesan
Intrman, Amornrat
Setapayak, Thana
Lertna, Sommai
Võ, Quang Minh
Võ, Quốc Tuấn
Trinh, Hoang Duong
Nguyen, Huu Quyen
Duong, Van Kham
Hin, Sarith
Veasna, Touch
Yadav, Manoj
Chin, Chharom
Keywords: Rice
Food security
COSMO Skymed
Issue Date: 2014
Series/Report no.: Remote Sensing;Volume 6(11) .- P.10773-10812
Abstract: Rice is the most important food security crop in Asia. Information on its seasonal extent forms part of the national accounting of many Asian countries. Synthetic Aperture Radar (SAR) imagery is highly suitable for detecting lowland rice, especially in tropical and subtropical regions, where pervasive cloud cover in the rainy seasons precludes the use of optical imagery. Here, we present a simple, robust, rule-based classification for mapping rice area with regularly acquired, multi-temporal, X-band, HH-polarized SAR imagery and site-specific parameters for classification. The rules for rice detection are based on the well-studied temporal signature of rice from SAR backscatter and its relationship with crop stages. We also present a procedure for estimating the parameters based on "temporal feature descriptors" that concisely characterize the key information in the rice signatures in monitored field locations within each site. We demonstrate the robustness of the approach on a very large dataset. A total of 127 images across 13 footprints in six countries in Asia were obtained between October 2012, and April 2014, covering 4.78 m ha. More than 1900 in-season site visits were conducted across 228 monitoring locations in the footprints for classification purposes, and more than 1300 field observations were made for accuracy assessment. Some 1.6 m ha of rice were mapped with classification accuracies from 85% to 95% based on the parameters that were closely related to the observed temporal feature descriptors derived for each site. The 13 sites capture much of the diversity in water management, crop establishment and maturity in South and Southeast Asia. The study demonstrates the feasibility of rice detection at the national scale using multi-temporal SAR imagery with robust classification methods and parameters that are based on the knowledge of the temporal dynamics of the rice crop. We highlight the need for the development of an open-access library of temporal signatures, further investigation into temporal feature descriptors and better ancillary data to reduce the risk of misclassification with surfaces that have temporal backscatter dynamics similar to those of rice. We conclude with observations on the need to define appropriate SAR acquisition plans to support policies and decisions related to food security.
ISSN: 2072-4292
Appears in Collections:Tạp chí quốc tế

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