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	Mapping Irrigated and Rainfed Wheat Areas Using Multi-Temporal Satellite Data
	Jin N.; Tao, B.; Ren, W.; Feng, M. C.; Sun, R.; He, L.; Zhuang, W.; Yu, Q.
	2016
关键词	irrigated and rainfed areas support vector machines phenology growth characteristics land-cover classification support vector machines modis time-series green-up date ndvi data vegetation type climate-change water-stress china phenology
英文摘要	Irrigation is crucial to agriculture in arid and semi-arid areas and significantly contributes to crop development, food diversity and the sustainability of agro-ecosystems. For a specific crop, the separation of its irrigated and rainfed areas is difficult, because their phenology is similar and therefore less distinguishable, especially when there are phenology shifts due to various factors, such as elevation and latitude. In this study, we present a simple, but robust method to map irrigated and rainfed wheat areas in a semi-arid region of China. We used the Normalized Difference Vegetation Index (NDVI) at a 30 x 30 m spatial resolution derived from the Chinese HJ-1A/B (HuanJing(HJ) means environment in Chinese) satellite to create a time series spanning the whole growth period of wheat from September 2010 to July 2011. The maximum NDVI and time-integrated NDVI (TIN) that usually exhibit significant differences between irrigated and rainfed wheat were selected to establish a classification model using a support vector machine (SVM) algorithm. The overall accuracy of the Google-Earth testing samples was 96.0%, indicating that the classification results are accurate. The estimated irrigated-to-rainfed ratio was 4.4:5.6, close to the estimates provided by the agricultural sector in Shanxi Province. Our results illustrate that the SVM classification model can effectively avoid empirical thresholds in supervised classification and realistically capture the magnitude and spatial patterns of rainfed and irrigated wheat areas. The approach in this study can be applied to map irrigated/rainfed areas in other regions when field observational data are available.
出处	Remote Sensing
卷	8
期	3
语种	英语
ISSN号	2072-4292
DOI标识	10.3390/rs8030207
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/43011]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Jin N.,Tao, B.,Ren, W.,et al. Mapping Irrigated and Rainfed Wheat Areas Using Multi-Temporal Satellite Data. 2016.

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