| zone.sum | R Documentation | 
This function sums raster values within zones
zone.sum(zone.r, value.r, exclude.anthro = TRUE, na.val = "na")
zone.r | 
 zonal raster  | 
value.r | 
 value raster to be summarized within zones  | 
exclude.anthro | 
 Logical; should NLCD anthropogenic habitats be excluded? Defaults to FALSE  | 
na.val | 
 NA value in value raster; defaults to "na"  | 
named vector (names = zones, values = sum of cell values)
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