LATCMP(1) LATCMP(1)
NAME
latcmp - compare latitudes
SYNOPSIS
latcmp [ -m ] [ -l lat lng ] ... [ file ... ]
DESCRIPTION
Latcmp computes the distance in meters between two points on
the earth using Thaddeus Vincenty's formula using the WGS-84
parameters. Divergent cases are approximated with the
Haversine formula. The default starting point is taken from
/lib/sky/here and can be overridden with the -l option. A
second -l option specifies the comparison point. Files
passed on the command line are expected to have one compari-
son point per line. Leading and trailing text is ignored.
A point consists of two floating-point numbers, representing
the latitude and longitude in degrees, separated by whites-
pace. The sign is negative for latitude South of the equa-
tor, and longitude West of the Prime Meridian.
For each point after the first, the geodesic distance in
meters to the first is computed. The output is the input
line (or the point, if specified on the command line) a tab
and the distance between that point and the first. The -m
flag only prints the point closest to the first. The -q
flag prints only the geodesic distance.
SOURCE
/sys/src/cmd/latcmp.c
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