public bool IsPointCoincident(IPoint ppoint, IFeatureLayer pDepthPointsLayer)
{
IFeatureIndex2 pFI2 = new FeatureIndexClass();
pFI2.FeatureClass = pDepthPointsLayer.FeatureClass;
IGeoDataset pGDS = pDepthPointsLayer.FeatureClass as IGeoDataset;
pFI2.Index(null, pGDS.Extent);
IIndexQuery2 pIQ2 = pFI2 as IIndexQuery2;
object pSAIds;
pIQ2.IntersectedFeatures(ppoint, out pSAIds);
if (pSAIds != null)
{
return(true);
}
return(false);
}
static void Main(string[] args)
{
//ESRI License Initializer generated code.
m_AOLicenseInitializer.InitializeApplication(new esriLicenseProductCode[] { esriLicenseProductCode.esriLicenseProductCodeAdvanced },
new esriLicenseExtensionCode[] { });
Dictionary <string, Vertex> nodeDict = new Dictionary <string, Vertex>();
Type factoryType = Type.GetTypeFromProgID("esriDataSourcesGDB.FileGDBWorkspaceFactory");
IWorkspaceFactory workspaceFactory = (IWorkspaceFactory)Activator.CreateInstance(factoryType);
IWorkspace workspace = workspaceFactory.OpenFromFile(@"C:\Users\hellocomrade\NHDPlusV21_GL_04.gdb", 0);
IFeatureWorkspace iFtrWs = workspace as IFeatureWorkspace;
if (null != iFtrWs)
{
IFeatureClass fcLine = iFtrWs.OpenFeatureClass("NHD_Flowline");
IFeatureClass fcPoint = iFtrWs.OpenFeatureClass("Hydro_Net_Junctions");
System.Diagnostics.Debug.Assert(null != fcLine && null != fcPoint);
var fldLst = new List <string> {
"OBJECTID", "FlowDir", "FTYPE", "V0001E_MA", "V0001E_MM", "V0001E_01", "V0001E_02", "V0001E_03", "V0001E_04", "V0001E_05", "V0001E_06", "V0001E_07", "V0001E_08", "V0001E_09", "V0001E_10", "V0001E_11", "V0001E_12"
};
Dictionary <string, int> fldDict = new Dictionary <string, int>();
fldLst.ForEach(fldName => fldDict.Add(fldName, fcLine.FindField(fldName)));
int lineFtrId = -1;
//Find field index for oid in Hydro_Net_Junctions feature class
int pntFtrIdIdx = fcPoint.FindField("OBJECTID");
string pntFtrId = null;
/*
* It has been observed that the most time consuming part of this script is on spatial query.
* We could take the same approach we had on Arcpy through fcLine.Search() with a spatial filter.
* However, it will make us have the same granularity as using arcpy.
* Instead, we took a different route here by using IFeatureIndex and IIndexQuery2
*/
IGeoDataset geoLineDS = (IGeoDataset)fcLine;
ISpatialReference srLine = geoLineDS.SpatialReference;
IFeatureIndex lineIdx = new FeatureIndexClass();
lineIdx.FeatureClass = fcLine;
lineIdx.Index(null, geoLineDS.Extent);
IIndexQuery2 queryLineByIdx = lineIdx as IIndexQuery2;
IFeatureIndex pointIdx = new FeatureIndexClass();
pointIdx.FeatureClass = fcPoint;
pointIdx.Index(null, ((IGeoDataset)fcPoint).Extent);
IIndexQuery2 queryPointByIdx = pointIdx as IIndexQuery2;
//Get a cursor on Hydro_Net_Junctions as the iterator
IFeatureCursor pntCur = fcPoint.Search(null, false);
IFeature pnt = pntCur.NextFeature();
IFeature line = null;
IFeature otherPnt = null;
List <string> requiredTypes = new List <string> {
"StreamRiver", "ArtificialPath"
};
/*
* ITopologicalOpeartor is good for two geometries comparing with each other. It doesn't fit
* very well for our situation, which check the geometric relationships between a geometry
* against a feature class that may have more than 100K geometries.
*/
//ITopologicalOperator optor = null;
/*
* It's a shame that we have to reference to a Server API in order to calcuate Geodesic
* distances for a polyline with lon/lat as coordinates.
*
* We could do Haversine ourselves, but we have to believe ESRI could definitely does a
* better job there, well, hard to figure out how to get this simple task done in an intutive
* way though...
*/
IGeometryServer2 geoOperator = new GeometryServerClass();
IPolyline polyLine = null;
List <DownstreamNode> dsLst = null;
int[] lineIds = null;
int[] pntIds = null;
object idobjs;
object idobjs1;
PolylineArray tmpArr = null;
IDoubleArray lengths = null;
double lineLen = 0.0;
double v = 0.0;
ILinearUnit unit = new LinearUnitClass();
var range = Enumerable.Range(3, 14);
int count = 0;
int incoming = 0;
while (null != pnt)
{
//get ftr id of the current vertex
pntFtrId = pnt.get_Value(pntFtrIdIdx).ToString();
//optor = pnt.Shape as ITopologicalOperator;
/*
* This should return feature ids that interects with the given geometry in the feature
* class having the index built.
*/
queryLineByIdx.IntersectedFeatures(pnt.Shape, out idobjs);
lineIds = idobjs as int[];
if (null != lineIds && lineIds.Length > 0)
{
foreach (int id in lineIds)
{
line = fcLine.GetFeature(id);
lineFtrId = int.Parse(line.get_Value(fldDict["OBJECTID"]).ToString());
if ("1" == line.get_Value(fldDict["FlowDir"]).ToString() && true == requiredTypes.Contains(line.get_Value(fldDict["FTYPE"]).ToString()))
{
polyLine = line.Shape as IPolyline;
if (isSamePoint(polyLine.FromPoint, pnt.Shape as IPoint))
{
queryPointByIdx.IntersectedFeatures(line.Shape, out idobjs1);
pntIds = idobjs1 as int[];
if (null != pntIds && 2 == pntIds.Length)
{
foreach (int pid in pntIds)
{
otherPnt = fcPoint.GetFeature(pid);
if (false == isSamePoint(otherPnt.Shape as IPoint, pnt.Shape as IPoint))
{
tmpArr = new PolylineArrayClass();
tmpArr.Add(polyLine);
lengths = geoOperator.GetLengthsGeodesic(srLine, tmpArr as IPolylineArray, unit);
if (0 == lengths.Count)
{
continue;
}
lineLen = lengths.get_Element(0) * 3.28084;
//var velos = from idx in range select double.Parse(line.get_Value(fldDict[fldLst[idx]]).ToString());
List <double> velos = new List <double>();
foreach (int idx in range)
{
v = double.Parse(line.get_Value(fldDict[fldLst[idx]]).ToString());
velos.Add(v == 0 ? 0 : lineLen / v);
}
if (null == dsLst)
{
dsLst = new List <DownstreamNode>();
}
dsLst.Add(new DownstreamNode(pid, id, velos));
}
}
}
}
else // pnt at the end of the polyline
{
++incoming;
}
}
}
}
if (null != dsLst || incoming > 0)
{
nodeDict.Add(pntFtrId, new Vertex(int.Parse(pntFtrId), incoming, dsLst));
}
pnt = pntCur.NextFeature();
if (++count % 1000 == 0)
{
Console.WriteLine("Processing Count: " + count);
}
incoming = 0;
dsLst = null;
}//end of while(null != pnt)
ReleaseCOMObj(pntCur);
}
ReleaseCOMObj(workspaceFactory);
//ESRI License Initializer generated code.
//Do not make any call to ArcObjects after ShutDownApplication()
m_AOLicenseInitializer.ShutdownApplication();
}