reverse geocoding using nominatim in asp.net

Question

I'm using nominatim for reverse geocoding in my asp.net website (Visual Studio 2010, C#).

I'm getting answer in XML or json format on another webpage like below:

• json
• xml

I cant read this address using XML reader or HTTP response.

Need help to convert this text into plain text and displaying on my website.

Answer 1

Well, you have to deserialize json data that you got from the web Service. You have to define two new classes, namely:

 [DataContract]
        public class Address
        {
            [DataMember]
            public string road { get; set; }
            [DataMember]
            public string suburb { get; set; }
            [DataMember]
            public string city { get; set; }
            [DataMember]
            public string state_district { get; set; }
            [DataMember]
            public string state { get; set; }
            [DataMember]
            public string postcode { get; set; }
            [DataMember]
            public string country { get; set; }
            [DataMember]
            public string country_code { get; set; }
        }

        [DataContract]
        public class RootObject
        {
            [DataMember]
            public string place_id { get; set; }
            [DataMember]
            public string licence { get; set; }
            [DataMember]
            public string osm_type { get; set; }
            [DataMember]
            public string osm_id { get; set; }
            [DataMember]
            public string lat { get; set; }
            [DataMember]
            public string lon { get; set; }
            [DataMember]
            public string display_name { get; set; }
            [DataMember]
            public Address address { get; set; }
        }

After that you will able to get the data by using this code:

WebClient webClient = new WebClient();
            var jsonData = webClient.DownloadData("http://nominatim.openstreetmap.org/reverse?format=json&lat=23.02951&lon=72.48689");

            DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(RootObject));
            var rootObject = ser.ReadObject(new MemoryStream(jsonData));

rootObject contains all data that you need, in order to convert it to plain text or any other format.

Answer 2

To resolved Forbidden error i have added header with WebClient object as below-

WebClient webClient = new WebClient(); 

**webClient.Headers.Add("User-Agent: Other");**

 var jsonData = webClient.DownloadData("http://nominatim.openstreetmap.org/reverse?format=json&lat=23.02951&lon=72.48689");

DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(RootObject));
var rootObject = ser.ReadObject(new MemoryStream(jsonData));

Answer 3

To complement the example given by Vladimir Gondarev, Nominatim currently does not accept requests without Referer and User-Agent. That way, just add these two lines:

webClient.Headers.Add("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.0.3705;)");
webClient.Headers.Add("Referer", "http://www.microsoft.com");

(Modify to your liking).