I am using the .net SDK. The queries are actually being performed by a service bus, so there is no "user" viewing a map, only code to query a FeatureLayer.
What I am trying to do is take a geometry point from a particular FeatureLayer ( a single point), then Query another FeatureLayer that uses Polygons, and find all the polygons that overlap that particular geometry point.
I have found plenty of places to do the opposite (see if a point is within a ploygon), but what i need is to find all polygons that touch a point.
The code I am using:
var treeFeatureUrl = "<myurl for a feature layer with single points>";
var uri = new Uri(treeFeatureUrl);
var queryTask = new QueryTask(uri);
var queryParams = new Query("OBJECTID,AssetId")
{
OutFields = OutFields.All,
ReturnGeometry = true,
Where = $"AssetID=140156"
};
var queryResult = await queryTask.ExecuteAsync(queryParams);
var firstTree = queryResult.FeatureSet.Features.FirstOrDefault();
textBox1.Text += JsonConvert.SerializeObject(firstTree, Formatting.Indented) + Environment.NewLine;
textBox1.Text += Environment.NewLine + Environment.NewLine;
var url = "<myurl for a feature layer with polygon areas>";
var mapUri = new Uri(url);
var qTask = new QueryTask(mapUri);
var qparams = new Query("OBJECTID")
{
Geometry = firstTree.Geometry,
OutFields = OutFields.All,
ReturnGeometry = false,
SpatialRelationship = SpatialRelationship.Within,
};
var findREsult = await qTask.ExecuteAsync(qparams);
var foundFeatures = findREsult.FeatureSet.Features;
textBox1.Text += JsonConvert.SerializeObject(foundFeatures, Formatting.Indented) + Environment.NewLine;
textBox1.Text += Environment.NewLine + Environment.NewLine;
The above code never returns any results, probably because it's using the geometry from the firstTree as the search area.
I am not sure how to accomplish what it is I am trying to achieve: find all polygons that touch a certain single point.
