d.geogr2km: Distance between Geographical Points

In amignan/rseismNet: Earthquake Frequency-Magnitude Distribution & Network Statistics

Description

Calculate the distance d (in kilometers) between two geographical points or between one geographical point and a vector of geographical points.

Usage

d.geogr2km(pt.ref, pt.list, method)

Arguments

pt.ref	a list of 2 parameters: lon the reference location longitude lat the reference location latitude
pt.list	a list or data frame of 2 parameters: lon the other location longitude(s) lat the other location latitude(s)
method	the method to be used to evaluate d: "fast" or "haversine" (see Details)

Details

The method = "fast" assumes that the surface is flat. The method = "haversine", slower, calculates the haversine distance by using the function geosphere::distHaversine. For regional earthquake catalogues, the error of the fast method is insignificant.

Value

the value(s) of the distance d between pt.ref and pt.list.

amignan/rseismNet documentation built on July 8, 2019, 6:53 p.m.