In case a volume surface is made between for example a bathymetry and a dredge design (could also be a bathymetry and a reclamation design); sometimes the clients want to know how much volume is present in a layer with 1m thickness of dredge volume; in a layer with dredge volume thickness between 1m and 3m; in a layer with dredge volume thickness of above 3m;...
1) In case our volume surface (base: bathy; comparison surface: dredge design) has both negative (dredge) as well as positive (where design is located above the bathy so has not to be dredged) values, this can be solved with inserting intervals in the 'Volumes and Areas' Table. And by only giving intervals with negative values going from 0 to the minimum level. The total volume of these intervals will be similar as the total cut volume in the 'Volume anaysis'.
2) In case our volume surface has only negative values; so the design is everywhere below the bathy and the whole area need to be dredged) this is NOT possible anymore to give intervals in the volume table that shows us the volumes for a layer with dredge volume thickness between 0m and 1m and so on. As this volume table will start from the minimum level which in that case is not 0. So for example if everywhere 10m thickness has to be dredged. The volume surface will have a level of +10m and the volume table will calculate 0m³ volume wile we need the volume of +10m times the area.
=> As this is a frequently asked question by the client it would be nice to have an option that the volume table always calculates from the 0-level towards the surface in case only positive or only negative values. In case the surface has bot negative and positive levels than the minimum level and maximum level can be kept.
