APPLEx

Soil surface roughness affects the radiometric observations by effectively increasing the surface area of electromagnetic wave emission. Its effect on observations at P- and L-band frequencies is difficult to quantify, and is therefore a critical parameter to be spatially characterised across the different land cover types. During APPLEx, surface roughness is characterized at three locations within each of the sampled paddocks, representing major land cover type and roughness conditions in the 3km x 3km focus areas. At each of the locations two 3m-long surface profiles will be recorded. In non-tilled areas, one oriented parallel to flight line (North-South) and one perpendicular (East-West). Over furrowed areas, sampling along and across the row direction will be undertaken.