We have a 2 m. high brick wall running all around out site. This wall belongs to the property so it is within the site boundary and the site boundary runs exactly along the outside surface of the wall. When making ground plane photometry calculations on the site boundary, should the calculation points be inside the wall or outside the wall? When outside, the values are obviously 0 fc due to the fact that luminaries are inside the site and the wall is casting shadow to the other side (although the 10 feet beyond site boundary calculations are not zero). When we calculate inside, we get higher values but this does not seem to be right to use as the wall is almost 60 cm. thick so the calculation points would not be on the site boundary.