# Calculating distance from lat/long data

Mark Garland magarland at NETZERO.NET
Thu Apr 12 19:01:26 CDT 2001

```A gentlemen named Victor Fraenckel has a free DOS program called "inverse"
that calculates distance from lat/long data. I can send you a zip file if
you want.  He also has other small geographic programs, too.

Mark Garland
Florida Department of Environmental Protection
2600 Blair Stone Road, Mail Station 2500
Tallahassee, Florida 32399-2400

From Fraenckel's ftp site (ftp://ftp.wizvax.net/pub/personal/victorf ):

The following programs are ALWAYS available:

The programs are DOS based and should run on most configurations
of PC type machines.

RULE2LL:

Computes the latitude and longitude of a point on a map
given the easting and northing offsets from the lower left
corner of the map. The measurements may be entered in inches
or millimeters. Hikers with GPS receivers will like this
program.

LL2RULE:

Given a Latitude and Longitude of a point on a map LL2RULE
will compute the easting and northing of the point
referenced to the lower left hand corner of the map. Input
and output formats as well as map scale, map reference
ellipsoid and corner latitude/longitude are user selectable.

INVERSE:

Given the latitude and longitude of two point on the earth's
surface, INVERSE will compute the distance between the two
points and the azimuth of each from the other.

DIRECT:

Given the latitude and longitude of a point on the earth's
surface and the distance and azimuth to a second point,
DIRECT will compute the latitude and longitude of the second
point and the azimuth of the first point from the second.
This is the general case of RULE2LL. Travellers with GPS

UTM2LL:

Given the UTM Grid Coordinates of a point on the earth's
surface, UTM2LL will compute the latitude and longitude of
that point.

LL2UTM:

Given the Latitude and Longitude of a point LL2UTM will
compute the UTM coordinates and zone of that point

FUTM2LL:

Given the UTM Grid Coordinates of a point on the earth's
surface, UTM2LL will compute the latitude and longitude of
that point. This program accepts it's input from a file of UTM
data and produces an output file of converted data.

These programs are to be found at the ftp site:

ftp.wizvax.net/pub/personal/victorf

as files inverse.zip, direct.zip, rule2ll.zip, ll2rule.zip, ll2utm.zip,
utm2ll.zip and futm2ll.zip.

Please try them out if they sound interesting and let me know what
you think. Please send suggestions for improvement. Bug reports are
especially solicited as they will be used to fix the programs and thereby
benefitting everyone who uses them. Be specific with the bug reports so I
have a chance to reproduce the problem and hopefully stamp out the critters.
I can be reached at:

victorf at wizvax.net

or by snail mail at:

Victor Fraenckel
Windsway Company
Scotia, New York 12302
USA

or by FAX at:

1 518 377 7574

December 8, 1997

----- Original Message -----
From: "Alan Prather" <alan at MSU.EDU>
To: <TAXACOM at USOBI.ORG>
Sent: Thursday, April 12, 2001 3:03 PM
Subject: Calculating distance from lat/long data

> Can anyone recommend simple, and preferably free, software to calculate
> geographic distance between sets of latitude and longitude coordinates?
>
>
> Alan Prather
> 166 Plant Biology, Wilson Road
> Botany & Plant Pathology
> Michigan State University
> East Lansing, MI 48824-1312
>
> (517) 355-4695
> fax (517) 353-1926
>
> alan at msu.edu
> http://www.bpp.msu.edu/herbarium/prather.html
>

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