project_to_hemisphere: Identidy visible points on an arbitrary global hemishpere...

In leonawicz/mapmate: Make Still Image Sequences For Data Animations

Description

Given a global hemispheric field of view defined by a single latitudinal and longitudinal centroid focal point, project geographic points onto the hemishpere.

Usage

project_to_hemisphere(lon, lat, lon0, lat0)

Arguments

lon	vector of longitudes.
lat	vector of latitudes.
lon0	longitude of focus coordinates.
lat0	latitude of focus coordinates.

Details

project_to_hemisphere identifies whether each pair of coordinates in the lat and lon vectors is in a field of view defined by a centroid focal point (lat0, lon0) and returns a data frame containing the original coordinates and a column indicating if the coordinates are in the field of view (TRUE or FALSE).

Value

returns a data frame.

Examples

lon <- seq(-180, 180, length.out=60)
lat <- rep(seq(-90, 90, length.out=30), 2)
project_to_hemisphere(lon, lat , 0, 0)

leonawicz/mapmate documentation built on May 21, 2019, 5:09 a.m.