/// <summary>
/// GET ELEVATION VALUES OF VERTEX
/// </summary>
/// <param name="analysisSurface">Analysis surface</param>
/// <param name="vertex">object vertex</param>
/// <returns>elevation of vertex</returns>
internal static double GetSurfaceElevation(AnalysisSurface analysisSurface, IPoint vertex)
{
// GET ELEVATION AT POINT LOCATION
double elevation = analysisSurface.Surface.GetElevation(vertex);
// MAKE SURE WE HAVE A VALID ELEVATION VALUE
if (analysisSurface.Surface.IsVoidZ(elevation))
{
throw new SurfaceUtilityException("Portion of the input feature falls outside the surface");
}
return(elevation);
}
/// <summary>
/// INTERPOLATE ELEVATION VALUES FOR VERTICES
/// </summary>
/// <param name="analysisSurface">Analysis surface</param>
/// <param name="vertices">Enumeration of vertices</param>
internal static void InterpolateVertices(AnalysisSurface analysisSurface, IEnumVertex vertices)
{
// RESET ENUM
vertices.Reset();
// ITERATE VERTICES
IPoint outVertex;
int partIndex;
int vertexIndex;
vertices.Next(out outVertex, out partIndex, out vertexIndex);
while (outVertex != null)
{
// GET ELEVATION AT POINT LOCATION
double elev = Helper.GetSurfaceElevation(analysisSurface, outVertex);
// ASSIGN Z USING ELEVATION
outVertex.Z = elev;
// GET NEXT VERTEX
vertices.Next(out outVertex, out partIndex, out vertexIndex);
}
}
/// <summary>
/// GET NODATA VALUE BASED ON PIXEL TYPE
/// </summary>
/// <param name="analysisSurface">object analysis surface</param>
/// <returns>Object represents the NoData value</returns>
internal static object GetDefaultNoDataValue(AnalysisSurface analysisSurface)
{
object defaultNoDataValue = null;
// RASTER PROPERTIES
IRasterProps rasterProps = (IRasterProps)analysisSurface.Raster;
object noDataValue = rasterProps.NoDataValue;
switch (rasterProps.PixelType)
{
/*
* case rstPixelType.PT_U1:
* defaultNoDataValue =.MinValue;
* break;
* case rstPixelType.PT_U2:
* defaultNoDataValue = .MinValue;
* break;
* case rstPixelType.PT_U4:
* defaultNoDataValue = .MinValue;
* break;
*/
case rstPixelType.PT_CHAR:
sbyte[] sbyteValue = (sbyte[])((noDataValue != null) ? (sbyte[])noDataValue : new sbyte[] { sbyte.MinValue });
defaultNoDataValue = sbyteValue[0];
break;
case rstPixelType.PT_UCHAR:
byte[] byteValue = (byte[])((noDataValue != null) ? (byte[])noDataValue : new byte[] { byte.MinValue });
defaultNoDataValue = byteValue[0];
break;
case rstPixelType.PT_SHORT:
case rstPixelType.PT_CSHORT:
short[] shortValue = (short[])((noDataValue != null) ? (short[])noDataValue : new short[] { short.MinValue });
defaultNoDataValue = shortValue[0];
break;
case rstPixelType.PT_USHORT:
ushort[] ushortValue = (ushort[])((noDataValue != null) ? (ushort[])noDataValue : new ushort[] { ushort.MinValue });
defaultNoDataValue = ushortValue[0];
break;
case rstPixelType.PT_LONG:
case rstPixelType.PT_CLONG:
long[] longValue = (long[])((noDataValue != null) ? (long[])noDataValue : new long[] { long.MinValue });
defaultNoDataValue = longValue[0];
break;
case rstPixelType.PT_ULONG:
uint[] ulongValue = (uint[])((noDataValue != null) ? (uint[])noDataValue : new uint[] { uint.MinValue });
defaultNoDataValue = ulongValue[0];
break;
case rstPixelType.PT_FLOAT:
case rstPixelType.PT_COMPLEX:
float[] floatValue = (float[])((noDataValue != null) ? (float[])noDataValue : new float[] { float.MinValue });
defaultNoDataValue = floatValue[0];
break;
case rstPixelType.PT_DOUBLE:
case rstPixelType.PT_DCOMPLEX:
double[] doubleValue = (double[])((noDataValue != null) ? (double[])noDataValue : new double[] { double.MinValue });
defaultNoDataValue = doubleValue[0];
break;
case rstPixelType.PT_UNKNOWN:
break;
default:
break;
}
return(defaultNoDataValue);
}