Virtual Ocean Distance SampWhen you complete your sampling in the assessment mode, you will try to estimate the actual population size using the instructions and equation provided in the assignment. Below you will find an example of the calculation. Plugging your data into the equation will give you the density of whales in the area. You will then multiply that density by the total area to estimate how many animals are likely out there. Density Equation: (n+u) / 2wL n= number of whales sighted by observer u= number of whales in the area undetected w= width of sampling (found by the farthest detected whale) L= transect length traveled ling