by : Bayu Yanuargi
Contour map is a map that contain the lines which are connected the location with a same elevation. Ussually the elevation are based on sea level but not must, some work not using sea level as a benchmark they prefered to use local benchmark point to get more detils calculation. On this posting we will talking about how to create a contour map using SRTM data that provided by free and for the GIS software, we will using QGIS that's free as well.