public double BilinearInterpolation(BLH f11, BLH f12, BLH f21, BLH f22, double B, double L)
{
if (f11.L == f12.L && f12.B == f22.B && f11.B == f21.B)
{
if (f11.H == 9999 || f12.H == 9999 || f21.H == 9999 || f22.H == 9999)
{
return(999999999);
}
double L1 = f11.L;
double L2 = f21.L;
double B1 = f11.B;
double B2 = f22.B;
BLH fR1 = new BLH();
BLH fR2 = new BLH();
fR1.L = L; fR1.B = B1;
fR1.H = ((L2 - L) / (L2 - L1)) * f11.H + ((L - L1) / (L2 - L1)) * f21.H;//f21
fR2.L = L; fR2.B = B2;
fR2.H = ((L2 - L) / (L2 - L1)) * f12.H + ((L - L1) / (L2 - L1)) * f22.H;
double fp = 0;
fp = ((B2 - B) / (B2 - B1)) * fR1.H + ((B - B1) / (B2 - B1)) * fR2.H;
return(fp);
}
else
{
return(999999999);
}
}
/// <summary>
/// 获取格网数据
/// </summary>
/// <param name="B">单位为分</param>
/// <param name="L">单位为分</param>
/// <param name="f11"></param>
/// <param name="f12"></param>
/// <param name="f21"></param>
/// <param name="f22"></param>
/// <returns></returns>
public bool GetGridPoints(double B, double L, ref BLH f11, ref BLH f12, ref BLH f21, ref BLH f22)
{
try
{
double L1, B1, L2, B2;
if (Math.Floor(L) % 2 == 1)
{
L1 = Math.Floor(L);
L2 = L1 + 2;
}
else
{
L1 = Math.Floor(L) - 1;
L2 = L1 + 2;
}
if (Math.Floor(B) % 2 == 1)
{
B1 = Math.Floor(B);
B2 = Math.Floor(B) + 2;
}
else
{
B1 = Math.Floor(B) - 1;
B2 = B1 + 2;
}
f11.B = B1; f11.L = L1;
Hashtable hstb = new Hashtable();
hstb = (Hashtable)GeoidEle[f11.B];
f11.H = (double)hstb[f11.L];
f12.B = B2; f12.L = L1;
hstb = new Hashtable();
hstb = (Hashtable)GeoidEle[f12.B];
f12.H = (double)hstb[f12.L];
f22.B = B2; f22.L = L2;
hstb = new Hashtable();
hstb = (Hashtable)GeoidEle[f22.B];
f22.H = (double)hstb[f22.L];
f21.B = B1; f21.L = L2;
hstb = new Hashtable();
hstb = (Hashtable)GeoidEle[f21.B];
f21.H = (double)hstb[f21.L];
//if (f11.H == 9999 || f12.H == 9999 || f21.H == 9999 || f22.H == 9999)
//{
// return false;
//}
return(true);
}
catch
{
return(false);
}
}
/// <summary>
///给出大地经纬度内插正常高
/// </summary>
/// <param name="B">度分秒为单位</param>
/// <param name="L">度分秒为单位</param>
/// <returns></returns>
public bool GetGeoidH_dms(double B, double L, ref double H)
{
double BDu = Math.Floor(B);
double BFen = Math.Floor((B - BDu) * 100);
double BMiao = ((B - BDu) * 100 - BFen) * 100;
B = BDu * 60 + BFen + BMiao / 60.0;
double LDu = Math.Floor(L);
double LFen = Math.Floor((L - LDu) * 100);
double LMiao = ((L - LDu) * 100 - LFen) * 100;
L = LDu * 60 + LFen + LMiao / 60.0;
try
{
BLH f11 = new BLH();
BLH f12 = new BLH();
BLH f21 = new BLH();
BLH f22 = new BLH();
if (GetGridPoints(B, L, ref f11, ref f12, ref f21, ref f22))
{
int num = 0;
List <BLH> fl = new List <BLH>();
if (f11.H == 9999.0)
{
num += 1;
}
else
{
fl.Add(f11);
}
if (f12.H == 9999.0)
{
num += 1;
}
else
{
fl.Add(f12);
}
if (f21.H == 9999.0)
{
num += 1;
}
else
{
fl.Add(f21);
}
if (f22.H == 9999.0)
{
num += 1;
}
else
{
fl.Add(f22);
}
if (num == 0)
{
H = BilinearInterpolation(f11, f12, f21, f22, B, L);
}
else if (num >= 3)
{
return(false);
}
else
{
H = IDWInterpolation(fl, B, L);
}
return(true);
}
else
{
return(false);
}
}
catch
{
return(false);
}
}
/// <summary>
/// 读入格网数据
/// </summary>
/// <returns></returns>
public bool ReadGrid(string filename)
{
try
{
FileStream fs = new FileStream(filename, FileMode.Open, FileAccess.Read);
StreamReader sr = new StreamReader(fs);
BLH blh = new BLH();
double StratB = 0, StartL = 0;
string linedata = "";
int HS = 0;
while (sr.Peek() != -1)
{
linedata = sr.ReadLine(); HS = HS + 1;
if (linedata == null)
{
break;
}
else if (linedata.Trim() == "")
{
break;
}
string[] line = AES_Key.AESDecrypt(linedata, ("xcq" + HS.ToString()).PadLeft(16, '0')).Split(" ".ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
StratB = Convert.ToDouble(line[0]) * 60 - 1;
StartL = Convert.ToDouble(line[1]) * 60 + 1;
if (!GeoidEle.ContainsKey(StratB))
{
for (int i = 0; i < 30; i++)
{
double B = 0;
linedata = sr.ReadLine(); HS = HS + 1;
line = AES_Key.AESDecrypt(linedata, ("xcq" + HS.ToString()).PadLeft(16, '0')).Split(" ".ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
B = StratB - i * 2.0;
Hashtable ht = new Hashtable();
for (int j = 0; j < 30; j++)
{
double L = 0;
L = StartL + j * 2.0;
blh.B = B;
blh.L = L;
blh.H = Convert.ToDouble(line[j]);
ht.Add(blh.L, blh.H);
}
GeoidEle.Add(B, ht);
}
}
else
{
for (int i = 0; i < 30; i++)
{
double B = 0;
linedata = sr.ReadLine(); HS = HS + 1;
line = AES_Key.AESDecrypt(linedata, ("xcq" + HS.ToString()).PadLeft(16, '0')).Split(" ".ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
B = StratB - i * 2.0;
Hashtable htt = new Hashtable();
htt = (Hashtable)GeoidEle[B];
GeoidEle.Remove(B);
for (int j = 0; j < 30; j++)
{
double L = 0;
L = StartL + j * 2.0;
blh.B = B;
blh.L = L;
blh.H = Convert.ToDouble(line[j]);
if (!htt.Contains(L))
{
htt.Add(L, blh.H);
}
else
{
if (Convert.ToDouble(htt[L]) == 9999.0 && blh.H != 9999.0)
{
htt[L] = blh.H;
}
}
}
GeoidEle.Add(B, htt);
}
}
}
sr.Close();
return(true);
}
catch
{
return(false);
}
}
/// <summary>
///给出大地经纬度内插正常高
/// </summary>
/// <param name="B">分为单位</param>
/// <param name="L">分为单位</param>
/// <returns></returns>
public bool GetGeoidH(double B, double L, ref double H)
{
try
{
BLH f11 = new BLH();
BLH f12 = new BLH();
BLH f21 = new BLH();
BLH f22 = new BLH();
if (GetGridPoints(B, L, ref f11, ref f12, ref f21, ref f22))
{
int num = 0;
List <BLH> fl = new List <BLH>();
if (f11.H == 9999.0)
{
num += 1;
}
else
{
fl.Add(f11);
}
if (f12.H == 9999.0)
{
num += 1;
}
else
{
fl.Add(f12);
}
if (f21.H == 9999.0)
{
num += 1;
}
else
{
fl.Add(f21);
}
if (f22.H == 9999.0)
{
num += 1;
}
else
{
fl.Add(f22);
}
if (num == 4)
{
H = BilinearInterpolation(f11, f12, f21, f22, B, L);
}
else if (num <= 1)
{
return(false);
}
else
{
H = IDWInterpolation(fl, B, L);
}
return(true);
}
else
{
return(false);
}
}
catch
{
return(false);
}
}