CCAMLRGIS (version 4.2.1)

seabed_area: Calculate planimetric seabed area

Description

Calculate planimetric seabed area within polygons and depth strata in square kilometers.

Usage

seabed_area(Bathy, Poly, PolyNames = NULL, depth_classes = c(-600, -1800))

Value

dataframe with the name of polygons in the first column and the area for each strata in the following columns.

Arguments

Bathy

bathymetry raster with the appropriate projection. It is highly recommended to use a raster of higher resolution than SmallBathy, see load_Bathy.

Poly

polygon(s) within which the areas of depth strata are computed.

PolyNames

character, column name (from the polygon object) to be used in the output.

depth_classes

numeric vector of strata depths. for example, depth_classes=c(-600,-1000,-2000). If the values -600,-1800 are given within depth_classes, the computed area will be labelled as 'Fishable_area'.

See Also

load_Bathy, SmallBathy, create_Polys, load_RBs.

Examples

# \donttest{

#create some polygons
MyPolys=create_Polys(PolyData,Densify=TRUE)
#compute the seabed areas
FishDepth=seabed_area(SmallBathy(),MyPolys,PolyNames="ID",
depth_classes=c(0,-200,-600,-1800,-3000,-5000))
#Result looks like this (note that the 600-1800 stratum is renamed 'Fishable_area')
#View(FishDepth)


# }