在VB利用内存映射文件读取大数据量原始遥感影像图

原始遥感影像数据一般是经过粗处理后以二进制格式提供给用户。这些影像数据同一般的图像数据相比数据量较大,通常采用专业遥感软件进行读取和处理。但当前应用中对遥感数据处理和分析的方法大多都要和GIS相结合,而当前国际流行的商业GIS一般都不具有图像处理功能,同样在商业遥感影像处理软件方面也很难发现较强的GIS功能。如何把GIS和RS有效地结合起来,是目前实际应用中面临的一个问题。论文在分析GIS和遥感影像处理功能集成的方法和意义的基础上,对比了传统文件读取方法和内存映射文件处理方法之间的差异,并给出了利用内存映射文件的方式显示和处理大数据量原始影像文件的具体实现思路。

Processing and Displaying Remote Sensing Image File by Using Memory Mapping File In VB

Usually roughly handled raw remote sensing data are in large quantity,and so should be read and process by special software.But in many applications,to perform processing and analyzing,GIS should be used.But neither the common GIS software has the function of processing image,nor the commercial RS software has the strong GIS analyz-ing function,so it brings a problem of how to integrate the GIS and RS.Based on analyzing the way and the meaning of the integration of the GIS,this paper compares the method of remote sensing image processing with the way of tradi-tional file reading and memory-mapping file,it also gives the detailed idea of how to display and handle raw remote sensing image file which is in large quantities.