public List <GeoPoint> GetLineGeometryElevation(IEnumerable <GeoPoint> lineGeoPoints, DEMDataSet dataSet, InterpolationMode interpolationMode = InterpolationMode.Bilinear)
{
if (lineGeoPoints == null)
{
throw new ArgumentNullException("lineGeoPoints", "Point list is null");
}
SqlGeometry geometry = GeometryService.ParseGeoPointAsGeometryLine(lineGeoPoints);
return(GetLineGeometryElevation(geometry, dataSet, interpolationMode));
}
public string GetDEMLocalPath(DEMDataSet dataSet)
{
return(_IGeoTiffService.GetLocalDEMPath(dataSet));
}
public List <GeoPoint> GetLineGeometryElevation(SqlGeometry lineStringGeometry, DEMDataSet dataSet, InterpolationMode interpolationMode = InterpolationMode.Bilinear)
{
if (lineStringGeometry == null || lineStringGeometry.IsNull)
{
return(null);
}
if (lineStringGeometry.STGeometryType().Value != "LineString")
{
throw new Exception("Geometry must be a linestring");
}
if (lineStringGeometry.STSrid.Value != 4326)
{
throw new Exception("Geometry SRID must be set to 4326 (WGS 84)");
}
BoundingBox bbox = lineStringGeometry.GetBoundingBox();
List <FileMetadata> tiles = this.GetCoveringFiles(bbox, dataSet);
// Init interpolator
IInterpolator interpolator = GetInterpolator(interpolationMode);
int numPointsSql = lineStringGeometry.STNumPoints().Value;
var sqlStart = lineStringGeometry.STPointN(1);
var sqlEnd = lineStringGeometry.STPointN(numPointsSql);
GeoPoint start = new GeoPoint(sqlStart.STY.Value, sqlStart.STX.Value);
GeoPoint end = new GeoPoint(sqlEnd.STY.Value, sqlEnd.STX.Value);
double lengthMeters = start.DistanceTo(end);
int demResolution = dataSet.ResolutionMeters;
int totalCapacity = 2 * (int)(lengthMeters / demResolution);
List <GeoPoint> geoPoints = new List <GeoPoint>(totalCapacity);
using (GeoTiffDictionary adjacentGeoTiffs = new GeoTiffDictionary())
{
bool isFirstSegment = true; // used to return first point only for first segments, for all other segments last point will be returned
foreach (SqlGeometry segment in lineStringGeometry.Segments())
{
List <FileMetadata> segTiles = this.GetCoveringFiles(segment.GetBoundingBox(), dataSet, tiles);
// Find all intersection with segment and DEM grid
List <GeoPoint> intersections = this.FindSegmentIntersections(segment.STStartPoint().STX.Value
, segment.STStartPoint().STY.Value
, segment.STEndPoint().STX.Value
, segment.STEndPoint().STY.Value
, segTiles
, isFirstSegment
, true);
// Get elevation for each point
this.GetElevationData(ref intersections, adjacentGeoTiffs, segTiles, interpolator);
// Add to output list
geoPoints.AddRange(intersections);
isFirstSegment = false;
}
//Debug.WriteLine(adjacentGeoTiffs.Count);
} // Ensures all geotifs are properly closed
return(geoPoints);
}