期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2010
卷号：XXXVIII - Part 8
页码：150-153
出版社：Copernicus Publications
摘要：The Tropical Rainfall Measuring Mission (TRMM) satellite aims to obtain more reliable rain data global scale. T he major instrument for rain observation is the precipitation radar (PR) that observes vertical profile of rainfall about 240 km cross track swath with 250 m vertical resolution and 5 km of horizontal resolution (footprint size). For the rain retrieval algorithm for the PR, it is needed to distinguish the rain echo and clutter to estimate the rain profile, because the algorithm need to correct the attenuation by rainfall throughout the profile (PR uses 13.8 GHz and it is certainly attenuate in moderate to heavy rainfall ) and the relatively high reflectivity clutter echo causes large error. The current algorithm tries to detect the clutter range for each ray by detecting the large change in radar echo around the earth surface range bin. In particular, this method also leads error especially for relatively heavy rainfall cases. Since the TRMM satellite has already more than 10 years of data, it is convenient to develop a clutter range map using no-rain data. As for the first step of the clutter map, an elevation map is developed using TRMM/PR data with horizontal resolution of 0.025 degree s. Since the vertical resolution of the PR is 250 m throughout the range and 125 m near surface ranges of near nadir angle bins, vertical resolution of the map can be about 10 m after averaging the many data. This map is compar ed with SRTM30 data and both maps show good agreement each other
