mNumber: Number of objects
In EhrmannS/rasterTools: Obtain and process earth observation data

Description Usage Arguments Value See Also Examples

Count the number of objects in a raster

1	mNumber(obj, scale = "patch", layer = NULL)

`obj`	[`Raster*(1)`] The object to measure.
`scale`	[`character(1)`] scale at which the area of objects should be calculated; possible values are `"patch"` and `"class"`.
`layer`	[`character(1)`] in case `obj` has several layers, specify here the layer for which the area of objects shall be calculated (by default, the first layer).

For scale = "class" the number of unique values (classes) in the raster. For scale = "patch" the number of objects per distinc value (i.e. the number of patches per class).

Other generic metrics: mAdjacency, mArea, mPerimeter, mValues

cat <- rtRasters$categorical
bin <- rBinarise(rtRasters$continuous, thresh = 40)

# the number ...
# ... per landcover type
mNumber(obj = cat, scale = "class")

# ... of patches per landcover type
mNumber(obj = cat, scale = "patch")

# ...  of certain values; from a binary raster, patches are 
# automatically determined
require(magrittr)
rBinarise(obj = cat, match = c(41, 44, 47)) %>%
  mNumber(scale = "patch", layer = "values_binarised")

mNumber(obj = bin, scale = "class")