A study on the effect of wheat row-structure on Microwave emissivity using field experiment data

One of the most important characteristics of crop is row-structure, whose periodic property can result in different scattering features comparing with other types of vegetation. In this paper, we´ll take wheat for example to analyze these special features based on field experiments. Theoretical foundation was first introduced and a field experiment was carried out for comparison and analysis. In the experiment, wheat land was scanned at different angles in both parallel-to-row and perpendicular-to-row directions based on a Truck-mounted Multi-frequency Microwave Radiometer (TMMR). With its support, we have done relevant sensitivity analysis of some characteristic parameters to explore the regular pattern of emissivity at these two azimuths. It has shown that row-structure of wheat has obvious effects on passive microwave emissivity at different observation azimuths, especially parallel-to-row and perpendicular-to-row. Soil moisture can influence these characteristics distinctly when the wheat was shot and sparse.