期刊
REMOTE SENSING
卷 8, 期 6, 页码 -出版社
MDPI
DOI: 10.3390/rs8060525
关键词
agriculture; land cover change; SPOT-5 Take-5; Sentinel-1A; evapotranspiration; TIGER initiative
类别
资金
- ESA Alcantara initiative project [14-P13]
- SPOT-5 Take-5 project [29142]
Optical and microwave images have been combined for land cover monitoring in different agriculture scenarios, providing useful information on qualitative and quantitative land cover changes. This study aims to assess the complementarity and interoperability of optical (SPOT-5 Take-5) and synthetic aperture radar (SAR) (Sentinel-1A) data for crop parameter (basal crop coefficient (K-cb) values and the length of the crop's development stages) retrieval and crop type classification, with a focus on crop water requirements, for an irrigation perimeter in Angola. SPOT-5 Take-5 images are used as a proxy of Sentinel-2 data to evaluate the potential of their enhanced temporal resolution for agricultural applications. In situ data are also used to complement the Earth Observation (EO) data. The Normalized Difference Vegetation Index (NDVI) and dual (VV + VH) polarization backscattering time series are used to compute the K-cb curve for four crop types (maize, soybean, bean and pasture) and to estimate the length of each phenological growth stage. The K-cb values are then used to compute the crop's evapotranspiration and to subsequently estimate the crop irrigation requirements based on a soil water balance model. A significant R-2 correlation between NDVI and backscatter time series was observed for all crops, demonstrating that optical data can be replaced by microwave data in the presence of cloud cover. However, it was not possible to properly identify each stage of the crop cycle due to the lack of EO data for the complete growing season.
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