Calculate 3D and 2D surface area of a raster in ArcGIS and QGIS (Grass)

This brief tutorial explains the tools used to calculate 3D and 2D areas from a raster surface (e.g., a Digital Elevation Model).
Refer to the manuals for further information:
ArcGIS: desktop.arcgis...
GRASS: grass.osgeo.or...
The video was done using the ArcGIS license of the University of Bremen (DE). For more information on ArcGIS and related products, see this page: www.esri.com/
QGIS is an open-source GIS platform and can be downloaded here: qgis.org/en/site/
DISCLAIMER: This is an educational video prepared for training purposes. The end-user is responsible to check the correctness of the final results for any applicative use of the tools/processes/analyses illustrated in the video.