internal async Task<Token> GenerateTokenAsync()
{
string tokenUrl = string.Format(@"https://www.arcgis.com/sharing/oauth2/token?client_id={0}&grant_type=client_credentials&client_secret={1}&f=pjson",
"client_id",
"client_secret");
try
{
HttpWebRequest webRequest = (HttpWebRequest)System.Net.WebRequest.Create(tokenUrl);
webRequest.Timeout = 0xea60;
System.Net.WebResponse response = await webRequest.GetResponseAsync();
DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof(Token));
_token = (Token)serializer.ReadObject(response.GetResponseStream());
return _token;
}
catch
{
return null;
}
}
//Use the ArcGIS REST API to create a profile line based on the input geometry
public async Task<Polyline> GetProfileLine(Geometry geometry)
{
try
{
string requestUrlBase = @"http://elevation.arcgis.com/arcgis/rest/services/Tools/Elevation/GPServer/Profile/";
//Create the token to use
TokenService elevationServices = new TokenService();
_token = await elevationServices.GenerateTokenAsync();
#region Submit a profile task to be executed asynchronously. A unique job ID will be assigned for the transaction.
string oidField = "OID";
string lengthField = "Shape_Length";
string InputLineFeatures = CreateInputLineFeaturesJson(geometry, oidField, lengthField);
string additonalParams = "&ProfileIDField=" + oidField + "&DEMResolution=FINEST&MaximumSampleDistance=10&MaximumSampleDistanceUnits=Kilometers&returnZ=true&returnM=true&env%3AoutSR=102100&env%3AprocessSR=102100&f=json";
string profileServiceUrl = string.Format("{0}submitJob?token={1}&InputLineFeatures={2}{3}", requestUrlBase, _token.AccessToken, InputLineFeatures, additonalParams);
System.Net.HttpWebRequest webRequest = (System.Net.HttpWebRequest)System.Net.WebRequest.Create(profileServiceUrl);
webRequest.Timeout = 0xea60;
System.Net.WebResponse response = await webRequest.GetResponseAsync();
#endregion
#region Use the jobId to check the status of the job. Keep checking if the jobStatus is not "Succeeded"
DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof(JobStatus));
_jobStatus = (JobStatus)serializer.ReadObject(response.GetResponseStream() as Stream);
while (_jobStatus.Status.Contains("Executing") || _jobStatus.Status.Contains("esriJobWaiting") || _jobStatus.Status.Contains("Submitted"))
{
string statusUrl = string.Format("{0}jobs/{1}?f=pjson&token={2}", requestUrlBase, _jobStatus.Id, _token.AccessToken);
webRequest = (System.Net.HttpWebRequest)System.Net.WebRequest.Create(statusUrl);
response = await webRequest.GetResponseAsync();
_jobStatus = (JobStatus)serializer.ReadObject(response.GetResponseStream());
}
#endregion
#region The job has successfully completed. Use the jobId to retrieve the result, then use the result to create a profile line
if (_jobStatus.Status.Contains("Succeeded"))
{
string resultsUrl = string.Format("{0}jobs/{1}/results/OutputProfile?returnZ=true&returnM=true&f=pjson&token={2}", requestUrlBase, _jobStatus.Id, _token.AccessToken);
webRequest = (System.Net.HttpWebRequest)System.Net.WebRequest.Create(resultsUrl);
response = await webRequest.GetResponseAsync();
serializer = new DataContractJsonSerializer(typeof(OutputProfile));
//Parse the result as the output profile line
_outputProfileLine = (OutputProfile)serializer.ReadObject(response.GetResponseStream());
_outputProfileLine.FeatureSet.HasM = true;
_outputProfileLine.FeatureSet.HasZ = true;
//Create a polyline (profile) from the geometry of the output profile line
Polyline profile = new Polyline();
foreach (var points in _outputProfileLine.FeatureSet.Features.FirstOrDefault().Geometry.Paths)
{
PointCollection collection = new PointCollection();
foreach (var point in points)
collection.Add(
new MapPoint(
Convert.ToDouble(point[0]), //[0] is x
Convert.ToDouble(point[1]), //[1] is x
Convert.ToDouble(point[2]), //[2] is z
Convert.ToDouble(point[3]), //[3] is m
new ESRI.ArcGIS.Client.Geometry.SpatialReference(102100)));
profile.Paths.Add(collection);
}
return profile;
}
return null;
#endregion
}
catch (Exception)
{
return null;
}
}
