ENVI标准数据读入 NVI使用的是通用栅格数据格式，包含一个简单的二进制文件（ a simple flat binary ）和一个相关的ASCII（文本）的头文件。这也保证了单个ENVI栅格文件没有大小上限。(NVI uses the universal raster data format, including a simple binary file (a simple flat binary) and a related ASCII (text) header file. This also ensures that a single ENVI grid file has no upper limit of size.)