The Maximum Neighbor Distance specifies the maximum distance (measured in kilometers) that a
monitor may be from a grid cell (distances are calculated using the grid cellcentroid). Cells
without any monitors within this distance will not be included in the resultant air quality grid. The
default setting is infinite (i.e. no limit to the distance between a monitor and a grid cell).
Note:Both the Maximum Relative Neighbor Distance and the Weighting Approach options are
irrelevant, since BenMAP is only choosing a single monitor to assign to any given grid cell.
5.2.2Voronoi Neighbor Averaging (VNA) for Monitor Direct
If you choose theVNA option, BenMAP first identifies the set of monitors that “surround” each
grid cell’s center (these monitors are referred to as the grid cell’sneighbors), and then BenMAP
calculates an inverse-distance weighted average of these neighboring monitors. In this section,
we provide some examples of the different ways that BenMAP calculates the average of the
neighbor monitors. See the appendix on Air Pollution Exposure Estimation Algorithms. for an
expanded discussion of VNA, including how the VNA algorithm actually chooses the neighbor
monitors, as well as the different ways that it may be used.
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