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SPHDIST: Stata module to compute spherical distances


  • Bill Rising



sphdist.ado does the spherical distance calculations. deg2rad.ado converts one to three variables expressing the degrees minutes and seconds of arc. The radius may be specified as a number, but if omitted defaults to the proper radius for the earth in whatever units you like to use. Either radians or degrees may be used, though degrees is the measure of choice. The latitude and longitude are fed to the ado file through the lat1() lon1() lat2() and lon2() options (which can be either numbers or variables or a mixture. If they are variables, each may have 1 to 3 variables for degrees minutes, and seconds of arc). This is version 1.1 of the software.

Suggested Citation

  • Bill Rising, 1999. "SPHDIST: Stata module to compute spherical distances," Statistical Software Components S372502, Boston College Department of Economics, revised 19 Jun 2000.
  • Handle: RePEc:boc:bocode:s372502 Note: This module may be installed from within Stata by typing "ssc install sphdist". Windows users should not attempt to download these files with a web browser.

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    spherical coordinates; geographic data;


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