/// <summary>
/// 根据每个像元的波段值及角度值、覆盖类型计算输出归一后的可见光、近红外
/// </summary>
/// <param name="redAndNir"></param>红光、近红外波段的反射率值(red、nir)
/// <param name="angles"></param>像元的观测角度值,csza,csaa,cvza,cvaa
/// <param name="ccovert"></param>土地覆盖类型
/// <param name="redAndNirZoom"></param>红光、近红外波段反射率的放大倍数
/// <param name=""></param>输出，归一后的可见光、近红外
public static UInt16[] NRedNir(UInt16[] redAndNir, float[] angles, byte ccovert, float[] redAndNirZoom)
{
float redBand, nirBand, csza, csaa, cvza, cvaa;// sisr;
//byte cbackgd=0;
double sr, vza, sza, phi, NDVI, redBand_c, nirBand_c;
int backgd = 0, covertp;
covertp = LAICalc.NormalizedCoverType((int)ccovert);
redBand = redAndNir[0] / redAndNirZoom[0]; //red
nirBand = redAndNir[1] / redAndNirZoom[1]; //nir
csza = angles[0]; //太阳天顶角
csaa = angles[1]; //太阳方位角
cvza = angles[2]; //卫星天顶角
cvaa = angles[3]; //卫星方位角
if (redBand < 0.001)
{
redBand = 0.001f;// in case very small or negative red ref. value
}
#region 计算各个波段的地表反射率
NDVI = (nirBand - redBand) / (nirBand + redBand);
redBand_c = 0.022182356 + 0.950173706 * redBand + 0.001741533 * nirBand - 0.06009188 * NDVI + 0.039824286 * NDVI * NDVI;
nirBand_c = -0.02199 + 0.111894 * redBand + 1.002059 * nirBand + 0.028802 * NDVI - 0.00598 * NDVI * NDVI;
#endregion
sr = (nirBand_c) / (redBand_c); //SRF correction for FY-3A/MERSI
if (covertp == 0 || cvza > 180) //cvza=Viwer's zenith angle
{
return(new UInt16[] { laiFillVlue, laiFillVlue });
}
vza = (double)cvza; //to get the physical value from the digital number of VGT's VZA
sza = (double)csza; //to get the physical value from the digital number of VGT's SZA
if (vza > 45)
{
vza = 44;
}
phi = (double)Math.Abs(cvaa - csaa);//to get phi fro digital number of VGT's VAA and SAA
if (phi > 180)
{
phi = phi - 180;
}
double[] NormalizationValue = NormalizationCalculator(sr, vza, sza, phi, covertp, backgd);
return(new UInt16[] { (UInt16)(redBand / NormalizationValue[0] * redAndNirZoom[0]),
(UInt16)(nirBand / NormalizationValue[1] * redAndNirZoom[1]) });
}
private static double[] NormalizationCalculator(double sr, double vza, double sza, double phi, int covertp, int backgd)
{
double lerate, le_p;
double[] brdffuncArray = new double[2];//brdffunc计算得到的红光、近红外归一化比值
LUTDataInit init = new LUTDataInit();
double[][] ka1a2co = init.CoverT[covertp - 1].Ka1a2co;
double[][] Ska1a2co = init.CoverT[covertp - 1].SKa1a2co;
double[][] cco = init.CoverT[covertp - 1].Cco;
double[][] Scco = init.CoverT[covertp - 1].SCco;
double[][] lesr = init.CoverT[covertp - 1].LeSr;
double[][] lersr = init.CoverT[covertp - 1].LeRsr;
int[] lines = init.CoverT[covertp - 1].Lines;
int[] Slines = init.CoverT[covertp - 1].SLines;
int a12lines = LUTData.a1a2lines[covertp - 1];
double swirmx = LUTData.swirmax[covertp - 1];
double swirmn = LUTData.swirmin[covertp - 1];
lerate = LUTData.a1a2lerate[covertp - 1];
#region 卫星天顶角
if (sza < 10)
{
#region 观测天顶角
if (vza < 10)
{
le_p = LAICalc.lefuncpre(sr, lines[0], lesr[0], backgd);// first estimation of LE
brdffuncArray = LAICalc.GetBrdffunc(a12lines, le_p / lerate, 0, 5, 0, ka1a2co[0], ka1a2co[1], ka1a2co[2], ka1a2co[3], cco[0], cco[1]);
}
else if (vza < 30)
{
le_p = LAICalc.lefuncpre(sr, lines[1], lesr[1], backgd) * (1 - phi / 180.0) + LAICalc.lefuncpre(sr, lines[24], lesr[24], backgd) * phi / 180.0;
brdffuncArray = LAICalc.GetBrdffunc(a12lines, le_p / lerate, 20, 5, 0, ka1a2co[0], ka1a2co[1], ka1a2co[2], ka1a2co[3], cco[0], cco[1]);
}
else if (vza < 45)
{
le_p = LAICalc.lefuncpre(sr, lines[2], lesr[2], backgd) * (1 - phi / 180.0) + LAICalc.lefuncpre(sr, lines[25], lesr[25], backgd) * phi / 180.0;
brdffuncArray = LAICalc.GetBrdffunc(a12lines, le_p / lerate, 40, 5, 0, ka1a2co[0], ka1a2co[1], ka1a2co[2], ka1a2co[3], cco[0], cco[1]);
}
else
{
le_p = LAICalc.lefuncpre(sr, lines[3], lesr[3], backgd) * (1 - phi / 180.0) + LAICalc.lefuncpre(sr, lines[26], lesr[26], backgd) * phi / 180.0;
brdffuncArray = LAICalc.GetBrdffunc(a12lines, le_p / lerate, 50, 5, 0, ka1a2co[0], ka1a2co[1], ka1a2co[2], ka1a2co[3], cco[0], cco[1]);
}
#endregion
}
else if (sza < 20)
{
#region 观测天顶角
if (vza < 10)
{
le_p = LAICalc.lefuncpre(sr, lines[4], lesr[4], backgd);
brdffuncArray = LAICalc.GetBrdffunc(a12lines, le_p / lerate, 0, 15, 0, ka1a2co[4], ka1a2co[5], ka1a2co[6], ka1a2co[7], cco[2], cco[3]);
}
else if (vza < 30)
{
le_p = LAICalc.lefuncpre(sr, lines[5], lesr[5], backgd) * (1 - phi / 180.0) + LAICalc.lefuncpre(sr, lines[27], lesr[27], backgd) * phi / 180.0;
brdffuncArray = LAICalc.GetBrdffunc(a12lines, le_p / lerate, 20, 15, 0, ka1a2co[4], ka1a2co[5], ka1a2co[6], ka1a2co[7], cco[2], cco[3]);
}
else if (vza < 45)
{
le_p = LAICalc.lefuncpre(sr, lines[6], lesr[6], backgd) * (1 - phi / 180.0) + LAICalc.lefuncpre(sr, lines[28], lesr[28], backgd) * phi / 180.0;
brdffuncArray = LAICalc.GetBrdffunc(a12lines, le_p / lerate, 40, 15, 0, ka1a2co[4], ka1a2co[5], ka1a2co[6], ka1a2co[7], cco[2], cco[3]);
}
else
{
le_p = LAICalc.lefuncpre(sr, lines[7], lesr[7], backgd) * (1 - phi / 180.0) + LAICalc.lefuncpre(sr, lines[29], lesr[29], backgd) * phi / 180.0;
brdffuncArray = LAICalc.GetBrdffunc(a12lines, le_p / lerate, 50, 15, 0, ka1a2co[4], ka1a2co[5], ka1a2co[6], ka1a2co[7], cco[2], cco[3]);
}
#endregion
}
else if (sza < 30)
{
#region 观测天顶角
if (vza < 10)
{
le_p = LAICalc.lefuncpre(sr, lines[8], lesr[8], backgd);
brdffuncArray = LAICalc.GetBrdffunc(a12lines, le_p / lerate, 0, 25, 0, ka1a2co[8], ka1a2co[9], ka1a2co[10], ka1a2co[11], cco[4], cco[5]);
}
else if (vza < 30)
{
le_p = LAICalc.lefuncpre(sr, lines[9], lesr[9], backgd) * (1 - phi / 180.0) + LAICalc.lefuncpre(sr, lines[30], lesr[30], backgd) * phi / 180.0;
brdffuncArray = LAICalc.GetBrdffunc(a12lines, le_p / lerate, 20, 25, 0, ka1a2co[8], ka1a2co[9], ka1a2co[10], ka1a2co[11], cco[4], cco[5]);
}
else if (vza < 45)
{
le_p = LAICalc.lefuncpre(sr, lines[10], lesr[10], backgd) * (1 - phi / 180.0) + LAICalc.lefuncpre(sr, lines[31], lesr[31], backgd) * phi / 180.0;
brdffuncArray = LAICalc.GetBrdffunc(a12lines, le_p / lerate, 40, 25, 0, ka1a2co[8], ka1a2co[9], ka1a2co[10], ka1a2co[11], cco[4], cco[5]);
}
else
{
le_p = LAICalc.lefuncpre(sr, lines[11], lesr[11], backgd) * (1 - phi / 180.0) + LAICalc.lefuncpre(sr, lines[32], lesr[32], backgd) * phi / 180.0;
brdffuncArray = LAICalc.GetBrdffunc(a12lines, le_p / lerate, 50, 25, 0, ka1a2co[8], ka1a2co[9], ka1a2co[10], ka1a2co[11], cco[4], cco[5]);
}
#endregion
}
else if (sza < 40)
{
#region 观测天顶角
if (vza < 10)
{
le_p = LAICalc.lefuncpre(sr, lines[12], lesr[12], backgd);
brdffuncArray = LAICalc.GetBrdffunc(a12lines, le_p / lerate, 0, 35, 0, ka1a2co[12], ka1a2co[13], ka1a2co[14], ka1a2co[15], cco[6], cco[7]);
}
else if (vza < 30)
{
le_p = LAICalc.lefuncpre(sr, lines[13], lesr[13], backgd) * (1 - phi / 180.0) + LAICalc.lefuncpre(sr, lines[33], lesr[33], backgd) * phi / 180.0;
brdffuncArray = LAICalc.GetBrdffunc(a12lines, le_p / lerate, 20, 35, 0, ka1a2co[12], ka1a2co[13], ka1a2co[14], ka1a2co[15], cco[6], cco[7]);
}
else if (vza < 45)
{
le_p = LAICalc.lefuncpre(sr, lines[14], lesr[14], backgd) * (1 - phi / 180.0) + LAICalc.lefuncpre(sr, lines[34], lesr[34], backgd) * phi / 180.0;
brdffuncArray = LAICalc.GetBrdffunc(a12lines, le_p / lerate, 40, 35, 0, ka1a2co[12], ka1a2co[13], ka1a2co[14], ka1a2co[15], cco[6], cco[7]);
}
else
{
le_p = LAICalc.lefuncpre(sr, lines[15], lesr[15], backgd) * (1 - phi / 180.0) + LAICalc.lefuncpre(sr, lines[35], lesr[35], backgd) * phi / 180.0;
brdffuncArray = LAICalc.GetBrdffunc(a12lines, le_p / lerate, 50, 35, 0, ka1a2co[12], ka1a2co[13], ka1a2co[14], ka1a2co[15], cco[6], cco[7]);
}
#endregion
}
else if (sza < 50)
{
#region 观测天顶角
if (vza < 10)
{
le_p = LAICalc.lefuncpre(sr, lines[16], lesr[16], backgd);
brdffuncArray = LAICalc.GetBrdffunc(a12lines, le_p / lerate, 0, 45, 0, ka1a2co[16], ka1a2co[17], ka1a2co[18], ka1a2co[19], cco[8], cco[9]);
}
else if (vza < 30)
{
le_p = LAICalc.lefuncpre(sr, lines[17], lesr[17], backgd) * (1 - phi / 180.0) + LAICalc.lefuncpre(sr, lines[36], lesr[36], backgd) * phi / 180.0;
brdffuncArray = LAICalc.GetBrdffunc(a12lines, le_p / lerate, 20, 45, 0, ka1a2co[16], ka1a2co[17], ka1a2co[18], ka1a2co[19], cco[8], cco[9]);
}
else if (vza < 45)
{
le_p = LAICalc.lefuncpre(sr, lines[18], lesr[18], backgd) * (1 - phi / 180.0) + LAICalc.lefuncpre(sr, lines[37], lesr[37], backgd) * phi / 180.0;
brdffuncArray = LAICalc.GetBrdffunc(a12lines, le_p / lerate, 40, 45, 0, ka1a2co[16], ka1a2co[17], ka1a2co[18], ka1a2co[19], cco[8], cco[9]);
}
else
{
le_p = LAICalc.lefuncpre(sr, lines[19], lesr[19], backgd) * (1 - phi / 180.0) + LAICalc.lefuncpre(sr, lines[38], lesr[38], backgd) * phi / 180.0;
brdffuncArray = LAICalc.GetBrdffunc(a12lines, le_p / lerate, 50, 45, 0, ka1a2co[16], ka1a2co[17], ka1a2co[18], ka1a2co[19], cco[8], cco[9]);
}
#endregion
}
else
{
#region 观测天顶角
if (vza < 10)
{
le_p = LAICalc.lefuncpre(sr, lines[20], lesr[20], backgd);
brdffuncArray = LAICalc.GetBrdffunc(a12lines, le_p / lerate, 0, 55, 0, ka1a2co[20], ka1a2co[21], ka1a2co[22], ka1a2co[23], cco[10], cco[11]);
}
else if (vza < 30)
{
le_p = LAICalc.lefuncpre(sr, lines[21], lesr[21], backgd) * (1 - phi / 180.0) + LAICalc.lefuncpre(sr, lines[39], lesr[39], backgd) * phi / 180.0;
brdffuncArray = LAICalc.GetBrdffunc(a12lines, le_p / lerate, 20, 55, 0, ka1a2co[20], ka1a2co[21], ka1a2co[22], ka1a2co[23], cco[10], cco[11]);
}
else if (vza < 45)
{
le_p = LAICalc.lefuncpre(sr, lines[22], lesr[22], backgd) * (1 - phi / 180.0) + LAICalc.lefuncpre(sr, lines[40], lesr[40], backgd) * phi / 180.0;
brdffuncArray = LAICalc.GetBrdffunc(a12lines, le_p / lerate, 40, 55, 0, ka1a2co[20], ka1a2co[21], ka1a2co[22], ka1a2co[23], cco[10], cco[11]);
}
else
{
le_p = LAICalc.lefuncpre(sr, lines[23], lesr[23], backgd) * (1 - phi / 180.0) + LAICalc.lefuncpre(sr, lines[41], lesr[41], backgd) * phi / 180.0;
brdffuncArray = LAICalc.GetBrdffunc(a12lines, le_p / lerate, 50, 55, 0, ka1a2co[20], ka1a2co[21], ka1a2co[22], ka1a2co[23], cco[10], cco[11]);
}
#endregion
}
#endregion
return(brdffuncArray);
}
