The calculation of volcanic deposit volume has been drastically improved
from two decades because of the apparition of detailed digital elevation
models. We proposed here an executable program with its graphical user
interface to compute them easily. Contrary to recent calculations that
assess the base of the volcano by using a contour interpolation through
Delaunay triangulation and which obtain generally flat basement, we also
consider the surrounding slopes to obtain the hidden volume in
paleo-depression and then better assess basement topography. We also
propose solutions to correct some basement elevations that are assessed
above the actual topography when using recent methods. We validated the
method with the Paricutin case. We also demonstrate the ability to
retrieve hidden volumes covered by younger volcanoes in the case of the
volcanic complex La Nieve.