Search results for "Paddy field"
showing 2 items of 22 documents
Retrieval of vegetation height in rice fields using polarimetric SAR interferometry with TanDEM-X data
2017
This work presents for the first time a demonstration with satellite data of polarimetric SAR interferometry (PolInSAR) applied to the retrieval of vegetation height in rice fields. Three series of dual-pol interferometric SAR data acquired with large baselines (2–3 km) by the TanDEM-X system during its science phase (April–September 2015) are exploited. A novel inversion algorithm especially suited for rice fields cultivated in flooded soil is proposed and evaluated. The validation is carried out over three test sites located in geographically different areas: Sevilla (SW Spain), Valencia (E Spain), and Ipsala (W Turkey), in which different rice types are present. Results are obtained duri…
The onset of the rainy season in Yunnan province, PR China and its significance for agricultural operations
1993
Data of 134 stations located in Yunnan province, PR China were analysed in order to study the temporal and spatial characteristics of the onset of the rainy season and to investigate the consequences for farming operations. Using a precipitation threshold value, a time span of 12 weeks was found for the complete onset of the rainy season, while the range of onset dates varied from 37 days to 155 days. The onset occurred at different places across the province and showed active and break phases due to the interaction of four different branches of the atmospheric circulation. The onset of the growing season, determined by summing up decade precipitation totals, showed the same general pattern…