/// <summary>
/// 计算平均坡度和坡长
/// </summary>
/// <param name="point"></param>
/// <param name="reader"></param>
/// <param name="avglength"></param>
/// <param name="avgslope"></param>
public void CalAvgSlopeLength(List <Point3d> points, RasterReader reader, ref double avglength, ref double avgslope)
{
double totalLength = 0;
double totalSlope = 0;
if (points != null && points.Count > 0)
{
int count = 0;
for (int i = 0; i < points.Count; i++)
{
Point3d startpt = points[i];
List <Point3d> resultPt = GetMaxSlopePoints(points[i], reader);
double singleLength = 0;
double singleSlope = 0;
for (int j = 0; j < resultPt.Count; j++)
{
Point3d point1 = resultPt[i];
Point3d point2 = resultPt[resultPt.Count - 1];
singleLength += RasterCoefficientReader.Length(point1, point2);
}
singleSlope = Math.Abs((startpt.Z - resultPt[resultPt.Count - 1].Z) / (RasterCoefficientReader.Length(startpt, resultPt[resultPt.Count - 1])));
totalSlope += singleSlope;
totalLength += singleLength;
count = points.Count * resultPt.Count;
FormOutput.AppendProress(((i + 1) * 100) / points.Count);
}
avglength = totalLength / (1000 * count);
avgslope = totalSlope * 1000 / points.Count;
}
}
private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
string[] args = e.Argument as string[];
double avgLength = 0;
double avgSlope = 0;
if (File.Exists(args[0]) && File.Exists(args[1]))
{
FormOutput.AppendLog("开始获取线的交点...");
RasterReader reader = new RasterReader(args[1]);
List <Point3d> pts = CalPoints(args[0], reader);
FormOutput.AppendLog("开始计算平均坡度和坡长...");
CalAvgSlopeLength(pts, reader, ref avgLength, ref avgSlope);
reader.Dispose();
FormOutput.AppendLog("平均坡长：" + avgLength.ToString("f3"));
FormOutput.AppendLog("平均坡度：" + avgSlope.ToString("f3"));
}
double?r = null;
if (File.Exists(args[1]) && File.Exists(args[2]))
{
FormOutput.AppendLog("开始计算坡面流速系数...");
r = RasterCoefficientReader.ReadCoeficient(args[2], args[1]);
if (r.HasValue)
{
FormOutput.AppendLog("结果--坡面流速系数为：" + r.Value.ToString());
}
}
e.Result = new double[] { avgLength, avgSlope, r.GetValueOrDefault(0) };
}
/// <summary>
/// 暴雨损失参数计算
/// </summary>
/// <param name="shppath"></param>
/// <param name="inputDemPath"></param>
/// <param name="outDemPath"></param>
public void RainLoss(string Rshppath, string rshppath, string inputDemPath, string areaShp, ref DoWorkEventArgs e)
{
//计算流域面积
double F = 0;
double?sf = null;
double?N = null;
if (File.Exists(areaShp))
{
FormOutput.AppendLog("开始计算流域面积和折减系数");
WatershedArea(areaShp, inputDemPath, ref F, ref sf);
sf = sf / 1000000;
FormOutput.AppendLog(string.Format("流域表面积SF = {0}km²", sf.Value.ToString("f3")));
F = F / 1000000;
FormOutput.AppendLog(string.Format("流域投影面积F = {0}km²", F.ToString("f3")));
N = 1 / (1 + 0.016 * F * 0.6);//折减系数
FormOutput.AppendLog("折减系数N = " + N.Value.ToString("f3"));
}
//计算折减系数
double?R = null;
if (File.Exists(Rshppath))
{
FormOutput.AppendLog("开始计算损失系数");
R = RasterCoefficientReader.ReadCoeficient(Rshppath, inputDemPath);
if (R.HasValue)
{
FormOutput.AppendLog("损失系数R = " + R.Value.ToString("f3"));
}
}
double?r = null;
if (File.Exists(rshppath))
{
FormOutput.AppendLog("开始计算损失指数");
r = RasterCoefficientReader.ReadCoeficient(rshppath, inputDemPath);
if (r.HasValue)
{
FormOutput.AppendLog("损失指数r = " + r.Value.ToString("f3"));
}
}
e.Result = new double?[] { F, N, R, r };
}
private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
string[] args = e.Argument as string[];
double riverlength = 0;
double j = 0;
if (File.Exists(args[0]) && File.Exists(args[1]))
{
FormOutput.AppendLog("开始递归所有沟道分支...");
List <Dictionary <Point2d, Geometry> > results = GetAllRivers(args[0]);
FormOutput.AppendLog(string.Format("共得到{0}条支流...", results.Count));
FormOutput.AppendLog("开始获取主沟道，并计算其长度...");
riverlength = CaculateRiver(results, args[1], ref _mainRiver);
riverlength = riverlength / 1000;
FormOutput.AppendLog("主河道长度：" + riverlength.ToString("f3"));
FormOutput.AppendLog("开始计算主沟道纵降比...");
j = GetLonGradient(_mainRiver, args[1]);
FormOutput.AppendLog("主河道纵降比：" + j.ToString("f3"));
}
double?r = null;
if (File.Exists(args[2]) && File.Exists(args[1]))
{
FormOutput.AppendLog("开始计算沟道流域系数...");
r = RasterCoefficientReader.ReadCoeficient(args[2], args[1]);
if (r.HasValue)
{
FormOutput.AppendLog("沟道流速系数：" + r.Value.ToString("f3"));
}
}
e.Result = new double[] { riverlength, j, r.GetValueOrDefault(0) };
}
/// <summary>
/// 计算当前点的最陡方向
/// 返回最陡方向的点集
/// D8算法
/// </summary>
/// <param name="point"></param>
/// <param name="reader"></param>
/// <param name="outresult"></param>
private List <Point3d> GetMaxSlopePoints(Point3d point, RasterReader reader)
{
double cellSizeX = reader.CellSizeX;
double cellSizeY = reader.CellSizeY;
int row = reader.RowCount / 50;
int col = reader.ColumnCount / 50;
double[] adfGeoTransform = new double[6];
reader.DataSet.GetGeoTransform(adfGeoTransform);
int _maxR = 0;
int _maxC = 0;
List <Point3d> outresult = new List <Point3d>();
//遍历周围八个点，取最大值
List <double> dstDic = new List <double>();
for (int r = 0; r < row; r++)
{
for (int c = 0; c < col; c++)
{
double center = RasterCoefficientReader.ReadBand(reader, c, r);
//东方,列+1，行不变,p(i,j)-p(i,j+1)
if (c + 1 < col)
{
double e = center - RasterCoefficientReader.ReadBand(reader, c + 1, r);
dstDic.Add(e);
}
else
{
dstDic.Add(-1);
}
//东南,列+1，行+1,p(i,j)-p(i+1,j+1)
if (c + 1 < col && r + 1 < row)
{
double es = (center - RasterCoefficientReader.ReadBand(reader, c + 1, r + 1)) / Math.Sqrt(2);
dstDic.Add(es);
}
else
{
dstDic.Add(-1);
}
//南，列+0，行+1
if (r + 1 < row)
{
double s = center - RasterCoefficientReader.ReadBand(reader, c, r + 1);
dstDic.Add(s);
}
else
{
dstDic.Add(-1);
}
//西南
if (0 < c - 1 && 0 < r - 1)
{
double ws = (center - RasterCoefficientReader.ReadBand(reader, c - 1, r - 1)) / Math.Sqrt(2);
dstDic.Add(ws);
}
else
{
dstDic.Add(-1);
}
//西
if (0 < c - 1)
{
double w = center - RasterCoefficientReader.ReadBand(reader, c - 1, r);
dstDic.Add(w);
}
else
{
dstDic.Add(-1);
}
//西北
if (0 < c - 1 && 0 < r - 1)
{
double wn = (center - RasterCoefficientReader.ReadBand(reader, c - 1, r - 1)) / Math.Sqrt(2);
dstDic.Add(wn);
}
else
{
dstDic.Add(-1);
}
//北
if (0 < r - 1)
{
double n = center - RasterCoefficientReader.ReadBand(reader, c, r - 1);
dstDic.Add(n);
}
else
{
dstDic.Add(-1);
}
//东北
if (0 < r - 1 && c + 1 < col)
{
double en = (center - RasterCoefficientReader.ReadBand(reader, c + 1, r - 1)) / Math.Sqrt(2);
dstDic.Add(en);
}
else
{
dstDic.Add(-1);
}
int result = 0;
//判断该点水流方向
var maxTime = dstDic.Select(x => x).Max();
int dir = dstDic.FindIndex(x => x == maxTime) + 1;
if (dir == 3)
{
result = 4;//南
_maxR = r + 1;
_maxC = c;
}
else if (dir == 2)
{
result = 2;//东南
_maxR = r + 1;
_maxC = c + 1;
}
else if (dir == 7)
{
result = 64;//北
_maxR = r - 1;
_maxC = c;
}
else if (dir == 1)
{
result = 1;//东
_maxR = r;
_maxC = c + 1;
}
else if (dir == 8)
{
result = 128;//东北
_maxR = r - 1;
_maxC = c + 1;
}
else if (dir == 6)
{
result = 32;//西北
_maxR = r - 1;
_maxC = c - 1;
}
else if (dir == 5)
{
result = 16;//西
_maxR = r;
_maxC = c - 1;
}
else if (dir == 4)
{
result = 8;//西南
_maxR = r + 1;
_maxC = c - 1;
}
else
{
result = 0;
_maxR = r;
_maxC = c;
}
double px = point.X + r * adfGeoTransform[1] + c * adfGeoTransform[2];
double py = point.Y + r * adfGeoTransform[4] + c * adfGeoTransform[5];
double pz = RasterCoefficientReader.ReadBand(reader, _maxR, _maxC);//_globeView.GetElevation(px, py);
Point3d maxPoint = new Point3d(px, py, pz);
outresult.Add(maxPoint);
Application.DoEvents();
} /* end for c */
Application.DoEvents();
} /* enf for r */
return(outresult);
}