where.max:
Find Location of Maximum in a Pixel Image
Description
Finds the spatial location(s) where a given pixel image
attains its maximum or minimum value.
Usage
where.max(x, first = TRUE) where.min(x, first = TRUE)
Arguments
x
A pixel image (object of class "im").
first
Logical value. If TRUE (the default), then only one location
will be returned. If FALSE, then all locations where the
maximum is achieved will be returned.
Value
A point pattern (object of class "ppp").
Details
This function finds the spatial location or locations where the
pixel image x attains its maximum or minimum value.
The result is a point pattern giving the locations.
If first=TRUE (the default), then only one location will
be returned, namely the location with the smallest $y$ coordinate
value which attains the maximum or minimum.
This behaviour is analogous to the functions
which.min and
which.max.
If first=FALSE, then the function returns
the locations of all pixels where the
maximum (or minimum) value is attained. This could be a large
number of points.