Algorithm for Latitude-Long
Gerald I. Evenden
gie at charon.er.usgs.gov
Tue Mar 23 13:23:27 EST 1993
> Date: Tue, 23 Mar 1993 10:28:42 -0600
> From: "Jacinda M. Barbehenn" <mountz at gis.uiuc.edu>
> Message-Id: <199303231628.AA08469 at murphy.gis.uiuc.edu>
> Sender: lists-owner at max.cecer.army.mil
> Reply-To: grassu-list at max.cecer.army.mil
> To: grassu-list at max.cecer.army.mil
> Subject: Algorithm for Latitude-Long
> I have a data set of the midpoints of counties based on latitude and
> longitude coordinates. With this data set I want to create a matrix that
> lists the distances between counties. However, to use latitude and longitude
> data, I need an algorithm that will correct for the longitude distances.
> Does anyone know of an algorithm that can do this?
> -jacinda barbehenn
> USACERL/UI GISLAB
> mountz at gis.uiuc.edu
There is program within the PROJ.4 distribution called "geod" which
will compute the distances you want from pairs of geographic coordinates.
It was also available in rel3 proj distribution. Documentation is in
the man file geod.1 in the distribution.
You can get PROJ.4 from ftp anon on charon.er.usgs.gov (188.8.131.52).
Gerald (Jerry) I. Evenden Internet: gie at charon.er.usgs.gov
voice: (508)563-6766 Postal: P.O. Box 1027
fax: (508)457-2310 N.Falmouth, MA 02556-1027
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