topic Re: I need help with GeoprocessingTask and Elevation Profile! in .NET Maps SDK Questions

I need help with GeoprocessingTask and Elevation Profile!

AndreyTsar — Thu, 20 Feb 2025 15:02:52 GMT

I couldn't fully figure out GeoprocessingTask and the Elevation Profile. Help me understand why outputFeatures.CanGetOutputFeatures is always false? My code:

var _elevationServiceUrl = new Uri("https://elevation.arcgis.com/arcgis/rest/services/Tools/ElevationSync/GPServer/Profile");
var geoprocessingTask = await GeoprocessingTask.CreateAsync(_elevationServiceUrl);

var fields = new List<Field>
{

};

var featureTable = new FeatureCollectionTable(fields, GeometryType.Polyline, SpatialReferences.Wgs84);
var feature = featureTable.CreateFeature();
feature.Geometry = polyline;
await featureTable.AddFeatureAsync(feature);

var parameters = await geoprocessingTask.CreateDefaultParametersAsync();
parameters.Inputs["InputLineFeatures"] = new GeoprocessingFeatures(featureTable);
parameters.Inputs["DEMResolution"] = new GeoprocessingString("FINEST");
parameters.Inputs["MaximumSampleDistance"] = new GeoprocessingDouble(200);

parameters.ReturnM = true;
parameters.ReturnZ = true;

var job = geoprocessingTask.CreateJob(parameters);
var result = await job.GetResultAsync();

if (result.Outputs.ContainsKey("OutputProfile"))
{
var outputFeatures = result.Outputs["OutputProfile"] as GeoprocessingFeatures;

if (outputFeatures != null && outputFeatures.CanGetOutputFeatures)
{
var featureSet = await outputFeatures.GetOutputFeaturesAsync();
foreach (var outputFeature in featureSet)
{
var geometry = outputFeature.Geometry as Polyline;
// Подальша обробка геометрії
}
}
else
{
MessageBox.Show("Помилка: OutputProfile не містить даних або не підтримує отримання результатів.");
}
}

Re: I need help with GeoprocessingTask and Elevation Profile!

GKmieliauskas — Fri, 21 Feb 2025 06:39:31 GMT

Hi,

As I understand from API reference, it must be like that:

IFeatureSet featureSet; if (outputFeatures.CanGetOutputFeatures) featureSet = await outputFeatures.GetOutputFeaturesAsync(); else featureSet = outputFeatures.Features ;

Re: I need help with GeoprocessingTask and Elevation Profile!

AndreyTsar — Fri, 21 Feb 2025 06:42:22 GMT

I really appreciate your response.This check should work

Re: I need help with GeoprocessingTask and Elevation Profile!

AndreyTsar — Fri, 21 Feb 2025 07:23:01 GMT

My final code:

public async Task<List<MapPoint>?> GetElevationProfile(Polyline polyline) { List<MapPoint> resultPoints = new(); var _elevationServiceUrl = new Uri("https://elevation.arcgis.com/arcgis/rest/services/Tools/ElevationSync/GPServer/Profile"); var geoprocessingTask = await GeoprocessingTask.CreateAsync(_elevationServiceUrl); var featureTable = new FeatureCollectionTable(new List<Field>(), GeometryType.Polyline, polyline.SpatialReference); var feature = featureTable.CreateFeature(); feature.Geometry = polyline; await featureTable.AddFeatureAsync(feature); var parameters = await geoprocessingTask.CreateDefaultParametersAsync(); parameters.Inputs.Add("InputLineFeatures", new GeoprocessingFeatures(featureTable)); parameters.Inputs.Add("DEMResolution", new GeoprocessingString("FINEST")); parameters.Inputs.Add("MaximumSampleDistance", new GeoprocessingDouble(200)); parameters.OutputSpatialReference = SpatialReferences.Wgs84; parameters.ReturnM = false; parameters.ReturnZ = true; try { var job = geoprocessingTask.CreateJob(parameters); var result = await job.GetResultAsync(); if (result?.Outputs?.ContainsKey("OutputProfile") == true) { var outputFeatures = result.Outputs["OutputProfile"] as GeoprocessingFeatures; if (outputFeatures != null) { IFeatureSet? featureSet = outputFeatures!.CanGetOutputFeatures ? await outputFeatures!.GetOutputFeaturesAsync() : outputFeatures!.Features; if (featureSet != null) foreach (var outputFeature in featureSet) { if (outputFeature?.Geometry?.GeometryType == GeometryType.Polyline) { var poly = outputFeature.Geometry as Polyline; var points = poly?.Parts.SelectMany(x => x.Points); if (points != null) resultPoints.AddRange(points); } } return resultPoints; } else MessageBox.Show("Помилка: OutputProfile не містить даних або не підтримує отримання результатів."); } else MessageBox.Show("Помилка: GetResultAsync не містить даних"); } catch { MessageBox.Show("Помилка: OutputProfile не містить даних або не підтримує отримання результатів."); } return null; }

Re: I need help with GeoprocessingTask and Elevation Profile!

AndreyTsar — Fri, 21 Feb 2025 12:25:38 GMT

Several results: