The Creation of Contour Lines from Freeware

Abstract

The main objectives of the study about the creation of contour lines from freeware were to create contour lines using an altitude from Google Earth and its accuracy assessment. To fulfill the objectives, the surface elevation was extracted from Google Earth by using TCX converter and QGIS to generated DEM, then created to contour lines. After that, we compared the accuracy assessment by an altitude from ALOS DEM. As a result, the software made the contour lines as contour interval 1 meter and its RMSE about 28.96 meters.