Monitor Direct.Monitor Direct grid creation uses air pollution monitoring data to estimate air
pollution levels for each grid cell in the selected Grid Definition. This may be done using one of
two interpolation procedures – Closest Monitor, orVoronoi Neighbor Averaging (VNA). With
closest monitor, BenMAP simply uses the data of the monitor closest to each grid cell's centroid.
With VNA, BenMAP first identifies the set of monitors that most closely “surround” each grid
cell, and then calculates an inverse-distance weighted average of the data from these neighboring
Monitor and Model Relative.Monitor and Model Relative grid creation allows you to
combine information from both monitor and modeling data files. BenMAP uses the modeling data
to scale the monitoring data, to compensate for incomplete monitoring data coverage, and the
inability of monitor data to predict future conditions. Like theMonitor Direct approach, you
choose an interpolation method (Closest Monitor or VNA), but a scaling approach is also chosen,
either temporal, spatial, or both. This approach is described in more detail in theAir Quality Grid
Creationchapter, as well as in the appendix on Air Pollution Exposure Estimation Algorithms.
Monitor Rollback.Monitor Rollback grid creation allows you to reduce, or roll back, monitor
data using three methods: percentage rollback, incremental rollback, and rollback to a standard.
Percentage rollback reduces all monitor observations by the same percentage. Incremental
rollback reduces all observations by the same increment. Rollback to a standard reduces monitor
observations so that they just meet a specified standard. After the monitor data is rolled back, it
may be directly interpolated (as inMonitor Direct grid creation) or combined with modeling data
(as inMonitor and Model Relative grid creation). This approach is described in more detail in
theAir Quality Grid Creation chapter, as well as in the appendix on Monitor Rollback Algorithms.
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castellano: DISPER CUSTIC DESCAR RADIA italiano:
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castellano: DIS CUS DES RAD english: DIS CUS DES RAD
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