I’m currently working on a project to quantify the volumes of the secondary containment dikes surrounding storage tanks in a tank farm. I am digitizing volume polygons along the top of the containment dikes in Global Mapper, based upon the DSM, and importing them in to compute the volume of the area within the dikes. Do the volume quantifications exclude the tank volume (up to the level of the containment dike) within the area being calculated? Is there a method to include that volume of the tank as well?
Also, is there a better way to define the area to be calculated than digitizing along the top of the dike in Global Mapper? Using the built-in volume tool to digitize the boundary gives a different result every time I use it which is less than desirable for doing somewhat accurate calculations.
Here is an example of what I’m working on: