Yelp API- Latitude/Longitude parameter problem {Key/Value}

Question

Hey guys, I have an issue that I can't quite figure out. Seems straightforward especially considering the script I compiled works smoothly. I collaborated and updated the yelp script that I posted on GitHub link text

Anyway, the yelp console indicates passing double values if I want to use latitude,longitude search method. For example, San Francisco's latitude/longitude is: 37.788022,-122.399797 . To pass this you'd have to use the "ll" key and then set the value like the example code indicates below{"ll",latitude_value,Longitude_value}:

 public static string searchterm = "food";
 public static string searchlocation = "San Francisco"+","+"Ca";
 public static double latitude = 37.788022;  //San Fran
 public static double longitude = -122.399797;
 public static string Coordinates = latitude + "," + longitude;
     .......
 // Fix up hashes to be webfriendly
     searchLocation = Uri.EscapeDataString(searchLocation);

     SortedDictionary<string, string> YelpParamsDictionary = new SortedDictionary<string, string> ()
     {
         {"term", searchterm },
      // {"location",searchlocation } 
         {"ll", Coordinates }            //<-------Here's the lat/long key/value paramter
     };

     WWW query = CreateYelpAPIQuery (YelpURL2,YelpParamsDictionary);
     yield return query;
      .......
      ........

Anyway, I recieved the JSON string when I use location method {"location","San Francisco"} with no problems. But when I switch to using their latitude/longitude method it gives me a bad request. No clue why. I have even tried converting the values to strings. Here's yelps api console - link text

Answer 1

Just a shot in the dark: What's your nationality? Because some countries use a comma as decimal point. Since double/float to string conversion uses the systems culture settings your lat long string might look like this:

 "37,788022,-122,399797"

instead of

 "37.788022,-122.399797"

Of course that format most likely isn't recognised. You should make sure to use a culture neutral conversion. Using the Invariant culture is usually the best approach when converting numbers to string.

If that's not the problem, make sure your Decimal Degrees lat / lon format is actually accepted by the site. There are a lot of different ways you can write down lat/lon coordinates.

edit
Ok. Since you took that example from the API documentation they should accept decimal Degrees ^^. So it's probably the to string conversion. You can check this easily be printing out all your parameters before you make that request.

Answer 2

Bunny83 - thanks for getting back to me. I really appreciate it. I tried your method, and unfortunately didn't get any traction.

 public static string latitude = "38.882071";  //washington dc
 public static string longitude = "-77.111845";
 public static string Coordinates =  latitude.ToString (CultureInfo.CreateSpecificCulture ("de-DE")) + "," + longitude.ToString (CultureInfo.CreateSpecificCulture ("de-DE"));
 //Coordinates  = 38,882071,-77,111845
     
         {"ll", Coordinates} //gives me errors

I Got similar errors. :(. FYI-I'm american,from DC. I don't get why the parameter is being so sensitive, I'm completely baffled. I moved to using the zip code method until it can get figured out- that key/value pair is:

 public static string zipcode= "22209";
  {"location",zipcode}

I get a response back,which is good. This kind of get's me there, but the center/reference point of a zip code can be totally different from a specific location(zip-lat/long vs. a specific location-lat/long). A zipcode is area-based which means it could cover a a lot of ground or not.

Yelp API- Latitude/Longitude parameter problem {Key/Value}

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