*Base on GDAL(Geospatial Data Abstraction Library)

* Digital Elevation Model(DEM)

* Working with geographic data

*read tif file

*write tif file

*GDAL is a translator library for raster and vector geospatial data formats that is released under an X/MIT style Open Source License by the Open Source Geospatial Foundation. As a library, it presents a single raster abstract data model and single vector abstract data model to the calling application for all supported formats.

* It also comes with a variety of useful command line utilities for data translation and processing.