[R] Retrieving latitude and longitude via Google Maps API

[Phil Spector]

Benjamin -
    Perhaps this will get you started:

> addr = '1600 Pennsylvania Avenue, Washington, DC'
> url = paste('http://maps.google.com/maps/api/geocode/xml?address=',
+              addr,'&sensor=false',sep='')
> library(XML)
> doc = xmlTreeParse(url)
> root = xmlRoot(doc)
> lat = xmlValue(root[['result']][['geometry']][['location']][['lat']])
> long = xmlValue(root[['result']][['geometry']][['location']][['lng']])
> lat 
[1] "38.8976500"
> long
[1] "-77.0356669"

 					- Phil Spector
 					 Statistical Computing Facility
 					 Department of Statistics
 					 UC Berkeley
 					 spector at stat.berkeley.edu



On Tue, 16 Mar 2010, Nutter, Benjamin wrote:

> Does anyone have any experience retrieving latitutde and longitude for
> an address from the Google Maps API?
>
> I'd like to have an R script that submits a street address, city, state,
> and zip code and returns the coordinates.  So far, I've been submitting
> the coordinates from another program, then loading the coordinates in R
> and merging them back into the data frame I want to use.  It'd be nice
> to be able to do it all in one script, but I'm not comprehending the API
> thing very well.
>
> I'm using R 2.9.1 on Windows XP.  Any suggestions or pointers?
>
> Benjamin
>
>
>
>  Benjamin Nutter |  Biostatistician  |  Quantitative Health Sciences
>  Cleveland Clinic  |  9500 Euclid Ave.   |  Cleveland, OH 44195  |
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