Implement a geocoder for US Census Bureau #116

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1. DR9885 commented on Dec 17, 2018

   

   DR9885

   on Dec 17, 2018

   Last edited by DR9885

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   possible example:

       public class UsCensusBureauGeocoder : IGeocoder
       {
           private readonly int _benchmark;
           private readonly HttpClient _client;
       
           private class UsCensusBureauAddress : Address
           {
               private const string Key = "UsCensusBureau";
           
               public UsCensusBureauAddress(string formattedAddress, Location coordinates) 
                   : base(formattedAddress, coordinates, Key)
               {
               
               }
           }
   
           public UsCensusBureauGeocoder(int benchmark = 9)
           {
               _benchmark = benchmark;
               _client = new HttpClient { BaseAddress = new Uri("https://geocoding.geo.census.gov/geocoder/") };
           }
           
           public async Task<IEnumerable<Address>> GeocodeAsync(string address)
           {
               // Build Query String
               var queryString = HttpUtility.ParseQueryString(string.Empty);
               queryString["address"] = address;
               queryString["benchmark"] = "4";
               queryString["format"] = "json";
               
               // Get Request
               var response = await _client.GetStringAsync($"locations/onelineaddress?" + queryString);
               
               // Read Result
               return GetAddresses(response);
           }
   
           public async  Task<IEnumerable<Address>> GeocodeAsync(string street, string city, string state, string postalCode, string country)
           {
               // Build Query String
               var queryString = HttpUtility.ParseQueryString(string.Empty);
               queryString["street"] = street;
               queryString["city"] = city;
               queryString["state"] = state;
               queryString["zip"] = postalCode;
               queryString["benchmark"] = "4";
               queryString["format"] = "json";
               
               // Get Request
               var response = await _client.GetStringAsync($"locations/address?" + queryString);
                   
               // Read Result
               return GetAddresses(response);
           }
   
           public Task<IEnumerable<Address>> ReverseGeocodeAsync(Location location)
           {
               throw new NotImplementedException();
           }
   
           public Task<IEnumerable<Address>> ReverseGeocodeAsync(double latitude, double longitude)
           {
               throw new NotImplementedException();
           }
   
           private static IEnumerable<UsCensusBureauAddress> GetAddresses(string response) 
           {
               var result = JObject.Parse(response)["result"];
   
               return result["addressMatches"]
                   .Select(match =>
                   {
                       var formatted = match["matchedAddress"].ToString();
                       var coordinates = match["coordinates"];
                       var x = Convert.ToDouble((object) coordinates["x"]);
                       var y = Convert.ToDouble((object) coordinates["y"]);
                       return new UsCensusBureauAddress(formatted, new Location(y, x));
                   })
                   .ToArray();
           }
       }
2. chadly

   added

   accepting-pull-requests

   on Dec 17, 2018
3. DR9885 commented on Dec 22, 2018

   

   DR9885

   on Dec 22, 2018

   ContributorAuthor

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   Opened Pull Request with tests:
   #117
4. DR9885 commented on Dec 22, 2018

   

   DR9885

   on Dec 22, 2018

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   when are you guys publishing the new nuget packages? I saw you guys added Here support as well.
5. DR9885 commented on Dec 22, 2018

   

   DR9885

   on Dec 22, 2018

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   using a different pull request
   #118
6. DR9885 commented on Jan 28, 2020

   

   DR9885

   on Jan 28, 2020

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   @chadly is there anything were missing or can we pull it back in?