gint16 a_dems_list_get_elev_by_coord ( GList *dems, const VikCoord *coord );
gint16 a_dems_get_elev_by_coord ( const VikCoord *coord, VikDemInterpol method);
gint16 a_dems_list_get_elev_by_coord ( GList *dems, const VikCoord *coord );
gint16 a_dems_get_elev_by_coord ( const VikCoord *coord, VikDemInterpol method);