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我已经下载好了TRMM 3B41和3B40的降雨数据,数据格式都是bin:
从官网所给的数据格式描述可知数据大致的排列形式如下,即数据应是1440×480的矩阵格式:
These data are output from the TRMM Multi-satellite Precipitation Analysis (TMPA), the Near Real-Time (RT) processing stream. The latency is about seven hours from the observation time, although processing issues may delay or prevent this schedule. Users should be mindful that the price for the short latency of these data is the reduced quality as compared to the research quality product 3B42. This particular dataset is an intermediate variable (VAR) rainrate IR estimate. Data files start with a header consisting of a 2880-byte record containing ASCII characters. The header line makes the file nearly self-documenting, in particular spelling out the variable and version names, and giving the units of the variables. Immediately after the header follow 3 data fields, "precip", "error","# pixels", with byte count correspondingly 1382400,1382400,691200. First two are 2-byte integers, and the third is 1-byte. All fields are 1440x480 grid boxes (0-360E,60N
S). The first grid box center is at (0.125E,59.875N). The grid increments most rapidly to the east. Grid boxes without valid data are filled with the (2-byte integer) "missing" value -31999. Valid estimates are only provided in the band 50N-S. This binary data sets are in IEEE "big-endian" floating-point format. The NASA Goddard Space Flight Center (GSFC) system to produce the TMPA-RT estimates in real time for use by the operational research community was developed to apply new concepts in merging quasi-global precipitation estimates and to take advantage of the increasing availability of input data sets in near real time.
我用MATLAB对其进行读取,所得结果并不是矩阵排列,而是一整列数据:
并且降雨数据明显不正确,不是特别大就是特别小,我不知道问题出在哪里???应该怎么读取这个bin数据呢?????求助大神,有些着急,谢谢大家了!!!!!
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