Import XYZ coordinate into GIS, Create DEM (Digital Elevation model) and extract and style contour
-Import XYZ coordinate from Total station data or survey data to QGIS.
-tin interpolation,
-Create Digital elevation model DEM from point cloud.
-Extract contour
-style contour,
-Separate contoru by major and minor contour and style based on type
-provide elevation label and style the labelling
-export contour from qgis to autocad