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Top Forums Shell Programming and Scripting Geographical distance between long and lat in bash Post 302914058 by Perderabo on Thursday 21st of August 2014 02:50:22 PM
Old 08-21-2014
The formula to compute the distance between a pair of latitude-longitude coordinates is actually rather complex. A simplified version is on this page.

**edit**
Actually, that doesn't look right. Earth's radius is more like 4000 miles. Your milage may vary. Smilie

** another edit **
I see what's happening.
Earth radius is:
3443 statute miles
3963 nautical miles
Make sure you don't confuse the two. Nautical miles would be the unit most likely used in a calculation like this.

Last edited by Perderabo; 08-21-2014 at 04:10 PM..
 

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KML2GMT(1gmt)						       Generic Mapping Tools						     KML2GMT(1gmt)

NAME
kml2gmt - Extract GMT table data from Google Earth KML files SYNOPSIS
kml2gmt [ infile ] [ -V ] [ -Z ] [ -:[i|o] ] [ -bo[s|S|d|D[ncol]|c[var1/...]] ] DESCRIPTION
kml2gmt reads a Google Earth KML file and outputs a GMT table file. Only KML files that contain points, lines, or polygons can be pro- cessed. This is a bare-bones operation that aims to extract coordinates and possibly the name and description tags of each feature. The main use intended is to capture coordinates modified in Google Earth and then reinsert the modified data into the original GMT data file. For a more complete reformatting, consider using ogr2ogr -f "GMT" somefile.gmt somefile.kml. infile Name of the KML file to work on. If not given, standard input is read. OPTIONS
No space between the option flag and the associated arguments. -Z Output the altitude coordinates as GMT z coordinates [Default will output just longitude and latitude]. -V Selects verbose mode, which will send progress reports to stderr [Default runs "silently"]. -: Toggles between (longitude,latitude) and (latitude,longitude) input and/or output. [Default is (longitude,latitude)]. Append i to select input only or o to select output only. [Default affects both]. -bo Selects binary output. Append s for single precision [Default is d (double)]. Uppercase S or D will force byte-swapping. Option- ally, append ncol, the number of desired columns in your binary output file. EXAMPLES
SEE ALSO
gmtdefaults(1), GMT(1), img2google(1), ps2raster(1) gmt2kml(1) GMT 4.5.7 15 Jul 2011 KML2GMT(1gmt)
All times are GMT -4. The time now is 04:22 AM.
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