public override double GetElevationFromWebService(double lat, double lng)
{
if (string.IsNullOrEmpty(ApiKey))
{
_logger.Trace("No Google API key set, returning elevation 0.");
return(0);
}
double elevationInMeters = 0;
try
{
string url = $"https://maps.googleapis.com/maps/api/elevation/json?key={ApiKey}&locations={lat},{lng}";
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
request.Credentials = CredentialCache.DefaultCredentials;
request.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.2 (KHTML, like Gecko) Chrome/15.0.874.121 Safari/535.2";
request.ContentType = "application/json";
request.ReadWriteTimeout = 2000;
using (WebResponse response = request.GetResponse())
{
using (Stream dataStream = response.GetResponseStream())
using (StreamReader reader = new StreamReader(dataStream))
{
string responseFromServer = reader.ReadToEnd();
GoogleResponse googleResponse = JsonConvert.DeserializeObject <GoogleResponse>(responseFromServer);
if (googleResponse.Status != "OK")
{
_logger.Warn("Request to Google API failed: {0}", googleResponse.ErrorMessage);
}
else
{
if (googleResponse.Results != null && googleResponse.Results.Count != 0)
{
elevationInMeters = googleResponse.Results[0].Elevation;
}
}
}
}
}
catch (Exception ex)
{
_logger.Error(ex, "Could not get elevation/altitude. Returning 0.");
elevationInMeters = 0;
}
return(elevationInMeters);
}
public override double GetElevationFromWebService(double lat, double lng)
{
if (string.IsNullOrEmpty(_apiKey))
{
return(0);
}
try
{
string url = $"https://maps.googleapis.com/maps/api/elevation/json?key={_apiKey}&locations={lat},{lng}";
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
request.Credentials = CredentialCache.DefaultCredentials;
request.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.2 (KHTML, like Gecko) Chrome/15.0.874.121 Safari/535.2";
request.ContentType = "application/json";
request.ReadWriteTimeout = 2000;
string responseFromServer = "";
using (WebResponse response = request.GetResponse())
{
using (Stream dataStream = response.GetResponseStream())
using (StreamReader reader = new StreamReader(dataStream))
{
responseFromServer = reader.ReadToEnd();
GoogleResponse googleResponse = JsonConvert.DeserializeObject <GoogleResponse>(responseFromServer);
if (googleResponse.status == "OK" && googleResponse.results != null &&
0 < googleResponse.results.Count && googleResponse.results[0].elevation > -100)
{
return(googleResponse.results[0].elevation);
}
// All error handling is handled inside of the ElevationService.
}
}
}
catch (ActiveSwitchByRuleException ex)
{
throw ex;
}
catch (Exception)
{
// If we get here for any reason, then just drop down and return 0.
}
return(0);
}
public override async Task <double> GetElevationFromWebService(double lat, double lng)
{
if (string.IsNullOrEmpty(_apiKey))
{
return(0);
}
using (HttpClient client = new HttpClient())
{
try
{
string url = $"https://maps.googleapis.com/maps/api/elevation/json?key={_apiKey}&locations={lat},{lng}";
var responseContent = await client.GetAsync(url).ConfigureAwait(false);
if (responseContent.StatusCode != HttpStatusCode.OK)
{
return(0);
}
var responseFromServer = await responseContent.Content.ReadAsStringAsync().ConfigureAwait(false);
GoogleResponse googleResponse = JsonConvert.DeserializeObject <GoogleResponse>(responseFromServer);
if (googleResponse.Status == "OK" && googleResponse.Results != null &&
0 < googleResponse.Results.Count && googleResponse.Results[0].Elevation > -100)
{
return(googleResponse.Results[0].Elevation);
}
}
catch (ActiveSwitchByRuleException ex)
{
throw ex;
}
catch (Exception)
{
// If we get here for any reason, then just drop down and return 0. Will cause this elevation service to be blacklisted.
}
}
return(0);
}
