How are the enhanced resolution image products produced?
Resolution enhancement is done using the BYU-developed Scatterometer Image Reconstruction (SIR) with Filtering (SIRF) algorithm. The SIRF algorithm was originally developed to enhance Seasat scatterometer image resolution by combining data from multiple passes of the satellite (Long, Hardin and Whiting, 1993) but has also be used with SSM/I radiometer data (Long and Daum, 1997) and ERS scatterometer data (Long, et. al, 1994). A number of improvements to the original SIRF algorithm have been developed to optimize its performance. The SIRF algorithm is based on a multivariate form of block multiplicative algebraic reconstruction. Combining multiple overlapping passes and robust performance in the presence of noise, it provides enhanced resolution measurements of the surface characteristics. The method used is a true reconstruction of the surface response using information in the sidelobes of the measurement resonse function (Early and Long, 2001). To provide a simple intuitive explanatio
