基于重叠区匹配技术的DVB-S MODIS影像异常数据处理方法

The Modification of the Abnormal Remote Sensing Data from the DVB-S System Based on MODIS

DVB-S(数字视频广播系统)是一种符合工业化标准的数字卫星广播新技术,中国气象局利用该技术建立起成本低廉、应用广泛的我国卫星遥感数据共享接收平台,可准实时获取美国EOS、NOAA和我国FY等系列遥感卫星数据。在使用该接收系统的过程中发现,由于信号干扰等原因,接收到的部分MODIS条带影像中存在异常数据,影响使用。鉴于DVB-S共享接收系统具有多站接收的特点,且各地面站的接收范围存在较大重叠,有针对性地提出了一种利用多站重叠区内的同名像元,对含有异常点的MODIS 1B级条带影像进行修正的方法(包括影像选择、重叠区匹配、异常点替换等),并通过Visual C++编程实现了自动化。

The DVB -S is a new digital satellite broadcasting technology which meets the industrial standard. Based on this technology, China Meteorological Administration built up a low- cost ,wildly- applied satellite remote sensing data sharing platform. The users can acquire the near - real - time satellite remote sensing data from US EOS, NOAA and Chinese FY satellite series. Due to the signal disturbance and other reasons, some received data have lots of abnormal data,which influence their utilization. Considering the multiple receiving stations in the DVB - S system, there would be lots of overlapped areas in their receiving range. A method for modifying the abnormal data in the MODIS 1B swath image by using the correspondent pixels in the overlapped area is introduced in this paper. Its key steps include image selection, overlapped area matching, abnormal data replacement etc. , and the automatic data processing code is realized by using Visual C ^＋＋.