Downwind, Crosswind and Radial Distances
The calculation of downwind and crosswind distances is described in Section 1.1.2. Since the complex terrain algorithms in ISC are based on a sector average, the radial distance is used in calculating the plume rise (see Section 1.5.4) and dispersion parameters (see Section 1.5.5). The radial distance is calculated as R = [x2 + y2]1/2, where x is the downwind distance and y is the crosswind distance described in Section 1.1.2.
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