What is sub-pixel decomposition technique (SP-DCT)?
Suppose we label a pixel or a group of pixels as irrigated. There is a tendency to think that the entire pixel area is irrigated. So, the full pixel area (FPA) is taken as irrigated area. But in reality, the only a certain proportion of the pixel is actually irrigated unless it is one of those rare pure pixel. So a pixel is de-composed to determine what percent of the pixel is actually irrigated and this can vary between very low proportions to a 100% for pure pixels. The technique that deals with de-composition of a pixel and assigning the sub-pixel area (SPA) or the actual area is called SP-DCT. Please see area story for further details. The SP-DT is one of the three methods of sub-pixel area calculations.
