https://www.cnblogs.com/94cool/archive/2013/06/28/3160244.html
HDF file can contain vector data and raster data.
c language file reader hdf HierarchicalDataFormat, you may store different types of image file formats and digital data, and may be transmitted on different types of machines, as well as libraries of such unitary file format. Most ordinary computer support this file format.
Based hdf file reading and writing: https://wenku.baidu.com/view/37955931eefdc8d376ee32b1.html