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Generate synthetic data set on sphere

evaluates
a "peaks-like" function at specific latitudes and longitudes on the
surface of a sphere, returning the synthetic data set `Z`

= geopeaks(`lat`

,`lon`

)`Z`

.
The function is continuous and smooth at all points, including the
poles. Reminiscent of the MATLAB `peaks`

function, `geopeaks`

undulates
gently between values of `-10`

and `8`

,
with about a half dozen local extrema.

evaluates the function on a specific spheroid. The choice of spheroid makes very
little difference. This option exists mainly to support formal testing. If you do
not specify `Z`

= geopeaks(___,`spheroid`

)`spheroid`

and the `GeographicCRS`

property of `R`

is not empty, then `geopeaks`

uses the spheroid contained in the `Spheroid`

property of the
`geocrs`

object in the `GeographicCRS`

property of `R`

.