mysociety/gaze
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commonlib @ 0cf06dc
Gaze is a web service that can do the following: * Find the population density at a particular point (using GPW data) * Return the radius of a circle around a point containing a number of people * Find placenames around a point, limited to population or distance. * Perform a placename geocoding of a search query (using USGS and GEOnet Names data) * Return the ISO country code for an IP address It is used on e.g. FixMyStreet to work out how wide to search to show reports for a particular map, or on PledgeBank for local search. Installation ============ $ git clone git://github.com/mysociety/gaze.git $ mkdir gaze-data $ cd gaze $ cp conf/general-example conf/general Edit the conf/general file to have the database connection parameters, and the location of two directories to store the Xapian and GPW data. Set up a PostgreSQL database called gaze. Fetch the single compressed zip that contains the entire country files dataset from http://earth-info.nga.mil/gns/html/namefiles.htm and unzip it in the gaze-data directory. For the US, fetch and unzip the Populated Places dataset from http://geonames.usgs.gov/ in the same place. Then run the following (replacing the input filenames with whatever you've just downloaded): $ psql gaze gaze < db/schema.sql $ cd ../gaze-data $ ../gaze/bin/usgs-geonames-parse < P_PLACES_20111204.txt $ ../gaze/bin/xapian-index US $ ../gaze/bin/geonames-split < geonames_dd_dms_date_20111212.txt $ ../gaze/bin/load-all This will set up all the place name related stuff. TODO: Document gpw-parse beyond the comments in it - converting Gridded Population of the World data into the format Gaze uses.
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The mySociety Gazetteer web service
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