GEOCIRCLES: Stata module to create circles defined by geographic coordinates

Robert Picard

Statistical Software Components from Boston College Department of Economics

Abstract: -geocircles- creates polygons that approximate the shape of circles on a sphere. Each polygon point is at a great-circle distance from the center point defined by its latitude and longitude. A great-circle distance is the shortest distance between two points measured along the surface of a sphere. -geocircles- generates two datasets that follow the model used by shp2dta (from SSC) when converting shapefiles to Stata datasets. Circles generated by -geocircles- will appear deformed if plotted using unprojected coordinates. Use -geo2xy- (from SSC) to apply a map projection to geographic coordinates before creating a map in Stata.

Language: Stata
Requires: Stata version 9.2
Keywords: great-circle distance; latitude and longitude; polygons; radius; map projection; geo2xy; spmap (search for similar items in EconPapers)
Date: 2015-04-02, Revised 2015-08-16
Note: This module should be installed from within Stata by typing "ssc install geocircles". The module is made available under terms of the GPL v3 (https://www.gnu.org/licenses/gpl-3.0.txt). Windows users should not attempt to download these files with a web browser.
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Downloads: (external link)
http://fmwww.bc.edu/repec/bocode/g/geocircles.ado program code (text/plain)
http://fmwww.bc.edu/repec/bocode/g/geocircles.hlp help file (text/plain)
http://fmwww.bc.edu/repec/bocode/g/geocircles_examples.ado program code (text/plain)

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