How to make DTM from DSM DEM Processing in QGIS Tutorial

Tutorial about how to make DTM (Digital Terrain Model) from DSM (Digital Surface Model) in QGIS using SAGA GIS Modules. This tutorial is intended to process low to mid resolution DSM/DEM like ASTER GDEM, SRTM, or ALOS 3D DEM 30 meter version.

Please be careful if you are intent to using this method, especially for the terrain slope setting. You must know exactly the general maximum slope (in percent) of your study area. This method probably wont works in fair level to a study area covering complex topographic features, but it is probably works best to flat to gentle terrain

This tutorial has been made using QGIS Software Version 3.2 Bonn. Why I am using this version? because this version has implemented an automatic SAGA GIS modules configuration, so you dont need to manually configure the SAGA Modules. Get QGIS for free at qgis.org.