This item may be available elsewhere in EconPapers: Search for items with the same title. Windows users should not attempt to download these files with a web browser.Ĭitations: View citations in EconPapers (19) Track citations by RSS feed clear input str10 pubnbr double( originlat originlong destinationlat destinationlong) EP0020938 48. With all of those details separated the other classes become much simpler. This release adds an Angle class that handles degrees and radians and contains the trig functions as well. The module is made available under terms of the GPL v3 (). geodist Implementation of the Haversine and Vincenty methods in Go for calculating geographical distances between points on the surface of the Earth. From your comments in a previous thread, you have lat/lon coordinates and you are trying to calculate distances between those points.Using the data you provided in the comments, heres an example of how to use geodist (from SSC) to calculate the distances. This release puts most of the functionality in the geodist.py module with methods in the classes that take a float as input representing degrees. Note: This module should be installed from within Stata by typing "ssc install geodist". Keywords: geodetic geodesic Vincenty great-circle ellipsoid distance (search for similar items in EconPapers) ![]() geodist can also calculate great-circle distances using the haversine formula. For futur reference, heres an revised version that shows how to use -geonear- in long form mode for every value of a variable. By default, geodist implements Vincenty's (1975) formula to calculate distances on a reference ellipsoid. 'GEODIST: Stata module to compute geographical distances,' Statistical Software Components S457147, Boston College Department of Economics, revised. Indeed, the -long- option for -geonear- is different and does not merge back with the original data because multiple neighbors are allowed, which could lead to a 'm:m' merge. use cashdata.dta rename householdid nborid save 'nborfile.dta' use cashdata.dta, clear geonear householdid latitude longitude using. This is quite typical for how one would use -geonear. Geodist calculates geographical distances by measuring the length of the shortest path between two points along the surface of a mathematical model of the earth. All you need here is to change the name of the householdid variable in your 'cashdata.dta' file and save it under another name before running geonear. ![]() Other common options include gen() to create a new variable (with the name of the new variable going in parentheses), by() to act on groups, and vce() to tell regression commands how to estimate the variance-covariance matrix. We examined whether both the quantity and quality of facilities within the ten kilometer radius of respondents were associated with contraceptive use. ![]() Thus many commands take a nolabel option that prompts them to ignore value labels. These facilities were identified using the STATA package geonear, which computes geodetic distances, and facility characteristics were merged into a joint dataset with MSAS data. Statistical Software Components from Boston College Department of Economics Stata reuses option names wherever it makes sense. GEODIST: Stata module to compute geographical distances
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