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Posted By

chrisaiv on 05/16/12


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nodejs


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hurcy


Node.js: Import geo-based Flickr data into CouchDB

 / Published in: JavaScript
 

URL: http://api.flickr.com/services/rest/?method=flickr.photos.search&api_key=API_KEY&text=kitty+kat&has_geo=true&extras=geo&per_page=1000&format=json&nojsoncallback=1

The Flickr URL creates a JSON feed with geo-based photos. Using Node.js, CouchDB, and cradle (npm install cradle), you can ingest the JSON data into CouchDB and perform complicated spatial indexing queries. The command for the import is bash$ node nameofthis_javascript.js

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  1. var cradle  = require("cradle"),
  2.     sys     = require("sys"),
  3.     fs      = require("fs");
  4.  
  5. var connection  = new(cradle.Connection)("localhost", 5984);
  6. var db          = connection.database('geoexample');
  7.  
  8. data            = fs.readFileSync("./json/data_flickr.json", "utf-8");
  9.  
  10. flickr          = JSON.parse(data);
  11.  
  12. for(p in flickr.photos.photo){
  13.     photo = flickr.photos.photo[p];
  14.  
  15.     photo.geometry = {"type":"Point",
  16.                       "coordinates": [ photo.longitude, photo.latitude ]
  17.                       };
  18.  
  19.     // Save the url to the flickr image.
  20.     // http://farm{farm-id}.static.flickr.com/{server-id}/{id}_{secret}_[mstzb].jpg
  21.  
  22.     photo.image_url_small = "http://farm"+photo.farm+".static.flickr.com/"+photo.server+"/"+photo.id+"_"+photo.secret+"_s.jpg";
  23.  
  24.     db.save(photo.id, photo, function(er, ok) {
  25.             if (er) {sys.puts("error: "+er); return;}
  26.         });
  27. }

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