marinus {spsurvey} | R Documentation |
This function converts x,y coordinates measured in units of latitude and longitude, i.e., geographic coordinates measured in decimal degrees, to coordinates in the equidistant, cylindric map projection measured in units of kilometers. The projection center is defined as the midpoint in latitude- longitude space. The map projection is named after Marinus of Tyre.
marinus(lat, lon)
lat |
vector of latitudes. |
lon |
vector of longitudes. |
A data frame with column names "x" and "y" containing the x and y coordinates in the equidistant, cylindric map projection measured in units of kilometers.
Denis White White.Denis@epa.gov
J.P. Snyder. USGS Prof. Paper 1395, p. 90.
lat <- 45 + runif(100, -5, 5) lon <- 120 + runif(100, -10, 10) marinus(lat, lon)