Mapping Paddy Field Extent and Temporal Pattern Variation in a Complex Terrain Area using Sentinel 1-Time Series Data: Case Study of Magelang District, Indonesia
Penulis/Author
Dr.Sc. Sanjiwana Arjasakusuma, S.Si., M.GIS. (1); SANDIAGA SWAHYU K (2); WILLIAM KRISTA M (3); NABILLA ASTRIVIANY (4)
Tanggal/Date
2021
Kata Kunci/Keyword
Abstrak/Abstract
The availability of free Synthetic Aperture Radar (SAR) data of Sentinel 1A/B, with the high
temporal resolution has provoked the usage of time-series backscatter values from the SAR data for
mapping paddy field extent and crop phenology. However, paddy field extent mapping over
complex terrain areas are rarely conducted, and the effect of terrain shadows to the accuracy of
paddy field classification has not been addressed yet. This study attempted to identify the effect of
terrain shadows to the paddy field mapping accuracy using monthly median composites Sentinel
S1A data in 2018 and to perform the effort to minimize the misclassification by incorporating dem-
derived terrain ruggedness index (TRI) in the random forest classifier. Lastly, this research also
aimed to identify the general variation of the time-series backscatter of VV-and-VH polarization in
the paddy field by employing K-means unsupervised classification. Our study showed that terrain
shadow contributed to the misclassification of the identified paddy field due to the similar low
backscatter values to the paddy field. Incorporating TRI can eliminate the misclassified paddy field,
which subsequently increased the accuracy of paddy field mapping by 8 – 9% (user accuracy) and 4
– 5% (producer accuracy). In addition, means of clustered classes from unsupervised classification
over paddy field areas generated temporal patterns related to the cropping frequencies and
agreement with the weather pattern of the study area. This indicated that cropping phase of paddy
could be identified using temporal pattern from 12-month median composites of the radar
backscatter.
Rumpun Ilmu
Geografi
Bahasa Asli/Original Language
English
Level
Internasional
Status
Dokumen Karya
No
Judul
Tipe Dokumen
Aksi
1
cover.pdf
[PAK] Daftar Isi
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cover2.pdf
[PAK] Halaman Cover
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[PAK] Bukti Korespondensi Penulis
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[PAK] Full Dokumen
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