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IceModel.cc
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IceModel.cc
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#include "TRandom3.h"
#include "Constants.h"
#include "Primaries.h"
#include "IceModel.h"
#include "EarthModel.h"
#include "Vector.h"
#include "Ray.h"
#include "Settings.h"
//#include "icemodel.hh"
//#include "earthmodel.hh"
//#include "vector.hh"
//#include "ray.hh"
#include <iostream>
#include <fstream>
#include <cstdlib>
ClassImp(IceModel);
using namespace std;
//class Interaction;
//Parameters of the BEDMAP ice model. (See http://www.antarctica.ac.uk/aedc/bedmap/download/)
int nCols_ice=1200; //number of columns in data, set by header file (should be 1200)
int nRows_ice=1000; //number of rows in data, set by header file (should be 1000)
int cellSize=5000; //in meters, set by header file (should be 5000) - same for both files
int xLowerLeft_ice=-3000000;
int yLowerLeft_ice=-2500000;
int nCols_ground=1068;
int nRows_ground=869;
int xLowerLeft_ground=-2661600;
int yLowerLeft_ground=-2149967;
int nCols_water=1200;
int nRows_water=1000;
int xLowerLeft_water=-3000000;
int yLowerLeft_water=-2500000;
int NODATA=-9999;
//Variables for conversion between BEDMAP polar stereographic coordinates and lat/lon. Conversion equations from ftp://164.214.2.65/pub/gig/tm8358.2/TM8358_2.pdf
const double scale_factor=0.97276901289; //scale factor at pole corresponding to 71 deg S latitude of true scale (used in BEDMAP)
const double ellipsoid_inv_f = 298.257223563; //of Earth
const double ellipsoid_b = EarthModel::R_EARTH*(1-(1/ellipsoid_inv_f));
const double eccentricity = sqrt((1/ellipsoid_inv_f)*(2-(1/ellipsoid_inv_f)));
const double bedmap_a_bar = pow(eccentricity,2)/2 + 5*pow(eccentricity,4)/24 + pow(eccentricity,6)/12 + 13*pow(eccentricity,8)/360;
const double bedmap_b_bar = 7*pow(eccentricity,4)/48 + 29*pow(eccentricity,6)/240 + 811*pow(eccentricity,8)/11520;
const double bedmap_c_bar = 7*pow(eccentricity,6)/120 + 81*pow(eccentricity,8)/1120;
const double bedmap_d_bar = 4279*pow(eccentricity,8)/161280;
const double bedmap_c_0 = (2*EarthModel::R_EARTH / sqrt(1-pow(eccentricity,2))) * pow(( (1-eccentricity) / (1+eccentricity) ),eccentricity/2);
double bedmap_R = scale_factor*bedmap_c_0 * pow(( (1 + eccentricity*sin(71*RADDEG)) / (1 - eccentricity*sin(71*RADDEG)) ),eccentricity/2) * tan((PI/4) - (71*RADDEG)/2); //varies with latitude, defined here for 71 deg S latitude
const double bedmap_nu = bedmap_R / cos(71*RADDEG);
/*
IceModel::IceModel() {
//default constructor
}
*/
IceModel::IceModel(int model,int earth_model,int moorebay) : EarthModel(earth_model),mooreBayFlag(moorebay) {
setUpIceModel(model);
}
IceModel::~IceModel () {
}
void IceModel::setUpIceModel(int model) {
DEPTH_DEPENDENT_N = (int) (model / 10);
model -= DEPTH_DEPENDENT_N * 10;
ice_model=model;
if (ice_model != 0 && ice_model != 1) {
cout<<"Error! Unknown ice model requested! Defaulting to Crust 2.0.\n";
ice_model = 0;
} //if
else if (ice_model==1) {
ReadIceThickness();
ReadWaterDepth();
ReadGroundBed();
} //else if (BEDMAP)
//read in attenuation length data for direct signals
int i=0;
ifstream sheetup("data/icesheet_attenlength_up.txt");
if(sheetup.fail())
{
cerr << "Failed to open icesheet_attenlength_up.txt" << endl;
exit(1);
}
i=0;
while(sheetup>>d_sheetup[i]>>l_sheetup[i])
{
i++;
}
sheetup.close();
ifstream shelfup("data/iceshelf_attenlength_up.txt");
if(shelfup.fail())
{
cerr << "Failed to open iceshelf_attenlength_up.txt" << endl;
exit(1);
}
i=0;
while(shelfup>>d_shelfup[i]>>l_shelfup[i])
{
i++;
}
shelfup.close();
ifstream westlandup("data/westland_attenlength_up.txt");
if(westlandup.fail())
{cerr << "Failed to open westland_attenlength_up.txt";
exit(1);
}
i=0;
while(westlandup>>d_westlandup[i]>>l_westlandup[i])
{
i++;
}
westlandup.close();
//read in attenuation length for downgoing signals
ifstream sheetdown("data/icesheet_attenlength_down.txt");
if(sheetdown.fail())
{
cerr << "Failed to open icesheet_attenlength_down.txt" << endl;
exit(1);
}
i=0;
while(sheetdown>>d_sheetdown[i]>>l_sheetdown[i])
{
i++;
}
sheetdown.close();
ifstream shelfdown("data/iceshelf_attenlength_down.txt");
if(shelfdown.fail())
{
cerr << "Failed to open iceshelf_attenlength_down.txt" << endl;
exit(1);
}
i=0;
while(shelfdown>>d_shelfdown[i]>>l_shelfdown[i])
{
i++;
}
shelfdown.close();
ifstream westlanddown("data/westland_attenlength_down.txt");
if(westlanddown.fail())
{cerr << "Failed to open westland_attenlength_down.txt";
exit(1);
}
i=0;
while(westlanddown>>d_westlanddown[i]>>l_westlanddown[i])
{
i++;
}
westlanddown.close();
}
int IceModel::Getice_model() {
return ice_model;
}
//constructor IceModel(int model)
Position IceModel::PickBalloonPosition() const {
Vector temp;
return temp;
}
//--------------------------------------------------
// int IceModel::PickUnbiased(int inu, Interaction *interaction1, IceModel *antarctica) {
//
//
// interaction1->PickAnyDirection(); // first pick the neutrino direction
//
// double mincos=cos(COASTLINE*RADDEG);
// double maxcos=cos(0.);
// double minphi=0.;
// double maxphi=2.*PI;
// double thisphi,thiscos,thissin;
// double theta=0.;
// double phi=0.;
//
// int ilon,ilat;
// int e_coord,n_coord;
// double vol_thisbin=0.;
// double lon=0.;
// double lat=0.;
//
//
// thisphi=gRandom->Rndm()*(maxphi-minphi)+minphi;
// thiscos=gRandom->Rndm()*(maxcos-mincos)+mincos;
// thissin=sqrt(1.-thiscos*thiscos);
// Position thisr_in;// entrance point
// Position thisr_enterice;
// Position thisr_enterice_tmp;
// Position thisnuexitearth;
// Position thisnuexitice;
// Position thisr_exitice;
// interaction1->noway=0;
// interaction1->wheredoesitleave_err=0;
// interaction1->neverseesice=0;
// interaction1->wheredoesitenterice_err=0;
// interaction1->toohigh=0;
// interaction1->toolow=0;
//
// thisr_in.SetXYZ(R_EARTH*thissin*cos(thisphi),R_EARTH*thissin*sin(thisphi),R_EARTH*thiscos);
// if (thisr_in.Dot(interaction1->nnu)>0)
// interaction1->nnu=-1.*interaction1->nnu;
// // does this intersect any ice
// //cout << "lat, coastline, cos are " << thisr_in.Lat() << " " << COASTLINE << " " << cos(interaction1->nnu.Theta()) << "\n";
// if (thisr_in.Lat()>COASTLINE && cos(interaction1->nnu.Theta())<0) {
// interaction1->noway=1;
//
// interaction1->pickunbiased=0;
// return 0; // there is no way it's going through the ice
// }
//
// int count1=0;
// int count2=0;
//
//
// if (Ray::WhereDoesItLeave(0,thisr_in,interaction1->nnu,antarctica,thisnuexitearth)) { // where does it leave Earth
// // really want to find where it leaves ice
// int err;
// // Does it leave in an ice bin
// if (IceThickness(thisnuexitearth) && thisnuexitearth.Lat()<COASTLINE) { // if this is an ice bin in the Antarctic
// //cout << "inu is " << inu << " it's in ice.\n";
// //cout << "this is an ice bin.\n";
// thisnuexitice=thisnuexitearth;
// thisr_exitice=thisnuexitearth;
// if (thisnuexitice.Mag()>Surface(thisnuexitice)) { // if the exit point is above the surface
// if ((thisnuexitice.Mag()-Surface(thisnuexitice))/cos(interaction1->nnu.Theta())>5.E3) {
// WhereDoesItExitIce(inu,thisnuexitearth,interaction1->nnu,5.E3, // then back up and find it more precisely
// thisr_exitice);
// thisnuexitice=(5000.)*interaction1->nnu;
// thisnuexitice+=thisr_exitice;
// count1++;
// }
// if ((thisnuexitice.Mag()-Surface(thisnuexitice))/cos(interaction1->nnu.Theta())>5.E2) {
//
// WhereDoesItExitIce(inu,thisnuexitice,interaction1->nnu,5.E2, // then back up and find it more precisely
// thisr_exitice);
// thisnuexitice=5.E2*interaction1->nnu;
// thisnuexitice+=thisr_exitice;
// count1++;
// }
// if ((thisnuexitice.Mag()-Surface(thisnuexitice))/cos(interaction1->nnu.Theta())>50.) {
//
// WhereDoesItExitIce(inu,thisnuexitice,interaction1->nnu,50., // then back up and find it more precisely
// thisr_exitice);
// count1++;
// } // end third wheredoesitexit
// thisnuexitice=thisr_exitice;
// } // if the exit point overshoots
// else
// thisnuexitice=thisnuexitearth;
//
// // should also correct for undershooting
// if (count1>10)
// cout << "count1 is " << count1 << "\n";
// } // if it's an Antarctic ice bin
// else { // it leaves a rock bin so back up and find where it leaves ice
// //cout << "inu is " << inu << " it's in rock.\n";
// if (thisr_in.Distance(thisnuexitearth)>5.E4) {
// count2++;
// if (WhereDoesItExitIce(inu,thisnuexitearth,interaction1->nnu,5.E4, // then back up and find it more precisely
// thisr_exitice)) {
//
// thisnuexitice=(5.E4)*interaction1->nnu;
// thisnuexitice+=thisr_exitice;
// //cout << "inu is " << inu << " I'm here 1.\n";
//
// }
// else {
// interaction1->neverseesice=1;
// interaction1->pickunbiased = 0;
// return 0;
// }
// }
// else
// thisnuexitice=thisnuexitearth;
// // WhereDoesItExitIce(inu,thisnuexit,interaction1->nnu,5.E4, // then back up and find it more precisely
// // thisr_exitice);
// // thisnuexit=5.E4*interaction1->nnu;
// // thisnuexit+=thisr_exitice;
// if (thisr_in.Distance(thisnuexitice)>5.E3) {
//
//
// if (WhereDoesItExitIce(inu,thisnuexitice,interaction1->nnu,5.E3, // then back up and find it more precisely
// thisr_exitice)) {
// count2++;
// //interaction1->neverseesice=1;
// thisnuexitice=5.E3*interaction1->nnu;
// thisnuexitice+=thisr_exitice;
// //cout << "inu is " << inu << " I'm here 2\n";
// //return 0;
//
// }
// }
// if (thisr_in.Distance(thisnuexitice)>5.E2) {
//
//
// if (WhereDoesItExitIce(inu,thisnuexitice,interaction1->nnu,5.E2, // then back up and find it more precisely
// thisr_exitice)) {
// count2++;
// //interaction1->neverseesice=1;
//
// thisnuexitice=5.E2*interaction1->nnu;
// thisnuexitice+=thisr_exitice;
// //cout << "inu is " << inu << " I'm here 3\n";
// //return 0;
// }
//
// }
// if (thisr_in.Distance(thisnuexitice)>50.) {
//
//
// if (WhereDoesItExitIce(inu,thisnuexitice,interaction1->nnu,50., // then back up and find it more precisely
// thisr_exitice)) {
// //interaction1->neverseesice=1;
// count2++;
// //cout << "inu is " << inu << " I'm here 4\n";
// //return 0;
// }
// }
// thisnuexitice=thisr_exitice;
// if (count2>10)
// cout << "count1 is " << count2 << "\n";
// // else return 0; // never reaches any ice or is it because our step is too big
// } // if the nu leaves a rock bin
// } // end wheredoesitleave
// else {
// interaction1->wheredoesitleave_err=1;
// interaction1->pickunbiased = 0;
// return 0;
// }
// // end finding where it leaves ice
//
// // if (thisnuexit.Mag()<Surface(thisnuexit)) { // if the exit point is below the surface
// // WhereDoesItExitIceForward(thisnuexit,interaction1->nnu,20., // then find it more finely
// // thisr_exitice);
// // thisnuexit=thisr_enterice;
// // // then back up and find it more precisely
// // }
//
// if (WhereDoesItEnterIce(thisnuexitearth,interaction1->nnu,5.E3, // first pass with sort of course binning
// thisr_enterice)) {
// thisr_enterice_tmp=thisr_enterice+5.E3*interaction1->nnu;
// //cout << "inu is " << inu << " thisr_enterice is ";thisr_enterice.Print();
// if (WhereDoesItEnterIce(thisr_enterice_tmp,interaction1->nnu,20., // second pass with finer binning
// thisr_enterice)) {
// //cout << "inu is " << inu << " thisr_enterice is ";thisr_enterice.Print();
// //cout << "entersice is ";thisr_enterice.Print();
// //cout << "thisnuexitice is ";thisnuexitice.Print();
// interaction1->pathlength_inice=thisr_enterice.Distance(thisnuexitice);
// //cout << "distance is " << distance << "\n";
// //cout << "inu " << inu << " thisr_enterice, thisnuexitice are ";thisr_enterice.Print();thisnuexitice.Print();
// interaction1->posnu=interaction1->pathlength_inice*gRandom->Rndm()*interaction1->nnu;
// interaction1->posnu=interaction1->posnu+thisr_enterice;
// //cout << "inu" << inu << " thisr_enterice, thisnuexitice are ";thisr_enterice.Print();thisnuexitice.Print();
// //cout << "inu " << inu << " distance is " << distance << "\n";
// }
// }
// else {
// thisr_enterice=thisr_in;
// interaction1->wheredoesitenterice_err=1;
// interaction1->pickunbiased = 0;
// return 0;
// }
// interaction1->nuexitice=thisnuexitice;
// interaction1->r_enterice=thisr_enterice;
//
// if (interaction1->posnu.Mag()-Surface(interaction1->posnu)>0) {
// interaction1->toohigh=1;
// //cout << "inu, toohigh is " << inu << " " << interaction1->toohigh << "\n";
// interaction1->pickunbiased = 0;
// return 0;
// }
// if (interaction1->posnu.Mag()-Surface(interaction1->posnu)+IceThickness(interaction1->posnu)<0) {
// interaction1->toolow=1;
// //cout << "inu, toolow is " << inu << " " << interaction1->toolow << "\n";
// interaction1->pickunbiased = 0;
// return 0;
// }
// interaction1->pickunbiased = 1;
// return 1;
//
// }
//--------------------------------------------------
//--------------------------------------------------
// int IceModel::PickNear() {
// }
//--------------------------------------------------
Vector IceModel::GetSurfaceNormal(const Position &r_out) const {
Vector n_surf = r_out.Unit();
if (FLATSURFACE)
return n_surf;
if (ice_model==0) {
double theta=r_out.Theta();
int ilon,ilat;
GetILonILat(r_out,ilon,ilat);
int ilon_previous=ilon-1;
if (ilon_previous<0)
ilon_previous=NLON-1;
int ilon_next=ilon+1;
if (ilon_next==NLON)
ilon_next=0;
double r=(geoid[ilat]+surfacer[ilon][ilat])*sin(theta);
double slope_phi=(surfacer[ilon_next][ilat]-surfacer[ilon_previous][ilat])/(r*2*phistep);
int ilat_previous=ilat-1;
if (ilat_previous<0)
ilat_previous=0;
int ilat_next=ilat+1;
if (ilat_next==NLAT)
ilat_next=NLAT-1;
double slope_costheta=(surfacer[ilon][ilat_next]-surfacer[ilon][ilat_previous])/((geoid[ilat]+surfacer[ilon][ilat])*2*thetastep);
// first rotate n_surf according to tilt in costheta and position on continent - rotate around the y axis.
double angle=atan(slope_costheta);
n_surf = n_surf.RotateY(angle);
// now rotate n_surf according to tilt in phi - rotate around the z axis.
angle=atan(slope_phi);
n_surf = n_surf.RotateZ(angle);
} //end if(Crust 2.0)
else if (ice_model==1) {
double dist_to_check = 7500; //check elevations at this distance north, south, east and west of event
double lon,lat;
double lon_prev,lon_next;
double lat_prev,lat_next;
lon = r_out.Lon();
lat = r_out.Lat(); //longitude and latitude of interaction
double local_surface_elevation = Surface(lon,lat);
lat_next = lat + dist_to_check * (180 / (local_surface_elevation * PI)); //the latitude 7.5 km south of the interaction
lat_prev = lat - dist_to_check * (180 / (local_surface_elevation * PI)); //the latitude 7.5 km north of the interaction
lon_next = lon + dist_to_check * (180 / (sin(lat*RADDEG) * local_surface_elevation * PI));
lon_prev = lon - dist_to_check * (180 / (sin(lat*RADDEG) * local_surface_elevation * PI));
if (lat_next > 90) {
//cout<<"lat_next is > 90"<<endl;
lat_next = 90 - (lat_next - 90); //if we went past the pole, set coordinates for the other side
lon_next += 180;
lon_prev += 180;
} //end if
//cout<<"lon, lat: "<<lon<<" , "<<lat<<endl;
//correct any out of range longitudes
if (lon_next > 360) {
//cout<<"lon_next > 360\n";
lon_next -= 360;
}
else if (lon_next < 0) {
//cout<<"lon_next < 0\n";
lon_next += 360;
}
if (lon_prev > 360) {
//cout<<"lon_prev > 360\n";
lon_prev -= 360;
}
else if (lon_prev < 0) {
//cout << "lon_prev < 0";
lon_prev += 360;
}
double slope_phi=(SurfaceAboveGeoid(lon_next,lat)-SurfaceAboveGeoid(lon_prev,lat))/(2*dist_to_check);
double slope_costheta=(SurfaceAboveGeoid(lon,lat_next)-SurfaceAboveGeoid(lon,lat_prev))/(2*dist_to_check);
// first rotate n_surf according to tilt in costheta - rotate around the y axis.
double angle=atan(slope_costheta);
n_surf = n_surf.RotateY(angle);
// now rotate n_surf according to tilt in phi - rotate around the z axis.
angle=atan(slope_phi);
n_surf = n_surf.RotateZ(angle);
} //end if(BEDMAP)
return n_surf;
} //method GetSurfaceNormal
Position IceModel::WhereDoesItEnterIce(const Position &posnu,
const Vector &nnu,
double stepsize) const {
// now get exit point...
// see my geometry notes.
// parameterize the neutrino trajectory and just see where it
// crosses the earth radius.
Position r_enterice;
double distance=0;
int left_edge=0;
Position x = posnu;
double x2;
Position x_previous = posnu;
double x_previous2= x_previous * x_previous;
x2=x_previous2;
double lon = x.Lon(),lat = x.Lat();
double lon_old = lon,lat_old = lat;
double local_surface = Surface(lon,lat);
double rock_previous2= pow((local_surface - IceThickness(lon,lat) - WaterDepth(lon,lat)),2);
double surface_previous2=pow(local_surface,2);
double rock2=rock_previous2;
double surface2=surface_previous2;
while (distance<2*local_surface+1000) {
distance+=stepsize;
x -= stepsize*nnu;
x2=x*x;
lon = x.Lon();
lat = x.Lat();
if (lon!=lon_old || lat!=lat_old) {
local_surface = Surface(lon,lat);
if (lat>COASTLINE)
left_edge=1;
rock2=pow((local_surface - IceThickness(lon,lat) - WaterDepth(lon,lat)),2);
surface2=pow(local_surface,2);
if (ice_model==0) {
if ((int)(lat)==COASTLINE && rock_previous2 < x2 && surface2 > x2)
left_edge=1;
} //if (Crust 2.0)
} //if (neutrino has stepped into new lon/lat bin)
if ((x_previous2>rock_previous2 && x2<rock2)
|| (x_previous2<surface_previous2 && x2>surface2)
|| left_edge) {
r_enterice = x;
// this gets you out of the loop.
distance=3*Geoid(lat);
} //if
x_previous = x;
x_previous2 = x2;
if (lon!=lon_old || lat!=lat_old) {
rock_previous2 = rock2;
surface_previous2 = surface2;
lat_old = lat;
lon_old = lon;
} //if
} //while
return r_enterice;
}//WhereDoesItEnterIce
Position IceModel::WhereDoesItEnter(const Position &posnu,const Vector &nnu) const {
// now get neutrino entry point...
// cout << posnu.GetX() << " : " << posnu.GetY() << " : " << posnu.GetZ() << endl;
// cout << posnu.R() << " : " << posnu.Theta() << " : " << posnu.Phi() << endl;
// cout << posnu.Lon() << " : " << posnu.Lat() << endl;
double p = posnu.Mag(); // radius of interaction
double costheta = (nnu*posnu) / p; // theta of neutrino at interaction position
double sintheta = sqrt(1-costheta*costheta);
double lon = posnu.Lon();
double lat = posnu.Lat();
double a=0; // length of chord
double R = Surface(lon,lat);
double delta = R - p; // depth of the interaction
// if interaction occurs below surface, as it should
if (delta>-0.001) {
a=p*costheta+sqrt(R*R*costheta*costheta+2*delta*R*sintheta*sintheta); // chord length
if (a<0) {
cout << "Negative chord length: " << a << "\n";
} //end if
} //end if (interaction below surface)
else if (delta<=-0.001) {
//cout << "Error in interaction position. whichray is " << whichray << "\n";
cout << "lon, lat from WhereDoesItEnter is " << " " << lon << " " << lat << "\n";
cout << "geoid, surface, p, surface-p are " << Geoid(lat) << " " << Surface(lon,lat) << ", " << p << " , "<<(Surface(lon,lat)-p)<<"\n";
} //else if: error: interaction takes place above the surface
// first approx
Position r_in = posnu - a*nnu;
int iter = 0;
// now do correction 3 times
//for (iter=0; iter<3; iter++) {
// delta = r_in.Mag() - Surface( r_in );
// r_in = r_in + (delta * nnu);
//}
delta = r_in.Mag() - Surface( r_in );
while ( fabs(delta) >= 0.1 ) {
r_in = r_in + (delta * nnu);
delta = r_in.Mag() - Surface( r_in );
iter++;
if ( iter > 10 ) {
//cout<<"\n r_in iteration more than 10 times!!! delta : "<<delta<<". now set r_in as before."<<endl;
r_in = Surface( r_in ) * r_in.Unit(); // the way before
delta = r_in.Mag() - Surface( r_in );
}
}
//lon = r_in.Lon();
//lat = r_in.Lat();
//r_in = Surface(lon,lat) * r_in.Unit();
return r_in;
} //method WhereDoesItEnter
int IceModel::WhereDoesItEnter_sphere(const Position &sphere_in, const Vector &nnu, Position &r_in ) const {
double p = sphere_in.Mag(); // radius of interaction
double costheta = (nnu*sphere_in) / p; // theta of neutrino at interaction position
double sintheta = sqrt(1-costheta*costheta);
double lon = sphere_in.Lon();
double lat = sphere_in.Lat();
double a=0; // length of chord
double R = Surface(lon,lat);
double delta = R - p; // depth of the interaction
// if interaction occurs below surface, as it should
// if sphere_in is inside the earth
if (delta>-0.001) {
//a=p*costheta+sqrt(R*R*costheta*costheta+2*delta*R*sintheta*sintheta); // chord length
a=p*costheta + sqrt(R*R-p*p*sintheta*sintheta); // chord length
if (a<0) {
cout << "Negative chord length: " << a << "\n";
} //end if
// first approx
r_in = sphere_in - a*nnu;
} //end if (sphere_in below surface)
// if sphere_in is outside the earth
else if (delta<=-0.001) {
// D : shortest distance between earth center and neutrino trajectory
Position D = sphere_in + (p*costheta)*nnu;
// neutrino pass through the earth
if ( D.Mag() < Surface(D) ) {
// first approx
r_in = sphere_in - (sqrt(R*R-D.Mag()*D.Mag())+costheta*p)*nnu;
}
// neutrino don't pass through the earth
else {
return 0;
}
} //else if (sphere_in above surface)
int iter = 0;
// now do correction 3 times
//for (iter=0; iter<3; iter++) {
// delta = r_in.Mag() - Surface( r_in );
// r_in = r_in + (delta * nnu);
//}
delta = r_in.Mag() - Surface( r_in );
while ( fabs(delta) >= 0.1 ) {
r_in = r_in + (delta * nnu);
delta = r_in.Mag() - Surface( r_in );
iter++;
if ( iter > 10 ) {
//cout<<"\n r_in iteration more than 10 times!!! delta : "<<delta<<". now set r_in as before."<<endl;
r_in = Surface( r_in ) * r_in.Unit(); // the way before
delta = r_in.Mag() - Surface( r_in );
}
}
// we found r_in properly
return 1;
} //method WhereDoesItEnter_new
Position IceModel::WhereDoesItLeave(const Position &posnu,const Vector &nnu) const {
// now get neutrino entry point...
double p = posnu.Mag(); // radius of interaction
double costheta = (nnu*posnu) / p; // theta of neutrino at interaction position
double sintheta = sqrt(1-costheta*costheta);
double lon = posnu.Lon();
double lat = posnu.Lat();
double a=0; // length of chord
double R = Surface(lon,lat);
double delta = R - p; // depth of the interaction
// if interaction occurs below surface, as it should
if (delta>-0.001) {
a=sqrt(R*R*costheta*costheta+2*delta*R*sintheta*sintheta) - p*costheta; // chord length
if (a<0) {
cout << "Negative chord length: " << a << "\n";
} //end if
} //end if (interaction below surface)
else if (delta<=-0.001) {
//cout << "Error in interaction position. whichray is " << whichray << "\n";
cout << "lon, lat from WhereDoesItLeave is " << " " << lon << " " << lat << "\n";
cout << "geoid, surface, p, surface-p are " << Geoid(lat) << " " << Surface(lon,lat) << " " << p << " , "<<(Surface(lon,lat)-p)<<"\n";
} //else if: error: interaction takes place above the surface
Position r_in = posnu + a*nnu;
lon = r_in.Lon();
lat = r_in.Lat();
r_in = Surface(lon,lat) * r_in.Unit();
return r_in;
} //method WhereDoesItLeave
// Below WhereDoesItEnterIce is from icemodel in icemc.
//--------------------------------------------------
// int IceModel::WhereDoesItEnterIce(const Position &posnu,
// const Vector &nnu,
// double stepsize,
// Position &r_enterice) {
// // now get exit point...
// // see my geometry notes.
// // parameterize the neutrino trajectory and just see where it
// // crosses the earth radius.
//
// // Position r_enterice;
// double distance=0;
// int left_edge=0;
// Position x = posnu;
// double x2;
//
// Position x_previous = posnu;
//
// double x_previous2= x_previous * x_previous;
// x2=x_previous2;
//
// double lon = x.Lon(),lat = x.Lat();
// double lon_old = lon,lat_old = lat;
// double local_surface = Surface(lon,lat);
// double rock_previous2= pow((local_surface - IceThickness(lon,lat) - WaterDepth(lon,lat)),2);
// double surface_previous2=pow(local_surface,2);
//
// double rock2=rock_previous2;
// double surface2=surface_previous2;
// int foundit=0; // keeps track of whether you found an ice entrance point
//
// // cout << "lon, lat are " << posnu.Lon() << " " << posnu.Lat() << "\n";
// //cout << "x2 at start is " << x2 << "\n";
// while (distance<2*local_surface+1000) {
//
// distance+=stepsize;
//
// x -= stepsize*nnu;
// x2=x*x;
// //cout << "x2 is " << x2 << "\n";
// lon = x.Lon();
// lat = x.Lat();
//
// double ice_thickness=IceThickness(lon,lat);
// if (lon!=lon_old || lat!=lat_old) {
// local_surface = Surface(lon,lat);
//
// //if (lat>COASTLINE)
// //left_edge=1;
//
// rock2=pow((local_surface - IceThickness(lon,lat) - WaterDepth(lon,lat)),2);
// surface2=pow(local_surface,2);
//
// if (ice_model==0) {
// if ((int)(lat)==COASTLINE && rock_previous2 < x2 && surface2 > x2)
// left_edge=1;
// } //if (Crust 2.0)
// } //if (neutrino has stepped into new lon/lat bin)
//
// if ((((x_previous2>rock_previous2 && x2<rock2) // crosses rock boundary from above
// || (x_previous2<surface_previous2 && x2>surface2)) && ice_thickness>0 && lat<COASTLINE) // crosses surface boundary from below
// || left_edge) {
// // cout << "lat, COASTLINE, left_edge is " << lat << " " << COASTLINE<< " " << left_edge << "\n";
// //cout << "x_previous2, surface_previous, x2, surface2 are " << x_previous2 << " " << surface_previous2 << " " << x2 << " " << surface2 << "\n";
// r_enterice = x;
// // this gets you out of the loop.
// //continue;
// distance=3*Geoid(lat);
// foundit=1;
// //cout << "foundit is " << foundit << "\n";
// //cout << "r_enterice is ";r_enterice.Print();
// //continue;
// } //if
//
// x_previous = x;
// x_previous2 = x2;
// //cout << "x_previous, x_previous2 " << x << " " << x2 << "\n";
//
// if (lon!=lon_old || lat!=lat_old) {
// rock_previous2 = rock2;
// surface_previous2 = surface2;
// lat_old = lat;
// lon_old = lon;
// } //if
//
// } //while
//
// return foundit;
// }//WhereDoesItEnterIce
//
//
//
//
// int IceModel::WhereDoesItExitIce(int inu,const Position &posnu,
// const Vector &nnu,
// double stepsize,
// Position &r_enterice) {
// // now get exit point...
// // see my geometry notes.
// // parameterize the neutrino trajectory and just see where it
// // crosses the earth radius.
//
// // Position r_enterice;
// double distance=0;
// int left_edge=0;
// Position x = posnu;
// double x2;
//
// if (inu==1491) {
//
// cout << "posnu is";posnu.Print();
// cout << "nnu is ";nnu.Print();
// }
//
//
// Position x_previous = posnu;
//
// double x_previous2= x_previous * x_previous;
// x2=x_previous2;
//
// double lon = x.Lon(),lat = x.Lat();
// double lon_old = lon,lat_old = lat;
// double local_surface = Surface(lon,lat);
// double rock_previous2= pow((local_surface - IceThickness(lon,lat) - WaterDepth(lon,lat)),2);
// double surface_previous2=pow(local_surface,2);
//
// double rock2=rock_previous2;
// double surface2=surface_previous2;
// int foundit=0; // keeps track of whether you found an ice entrance point
//
//
//
// // cout << "lon, lat are " << posnu.Lon() << " " << posnu.Lat() << "\n";
// //cout << "x2 at start is " << x2 << "\n";
// int nsteps=0;
// while (distance<2*local_surface+1000) {
// //cout << "another step.\n";
// distance+=stepsize;
// nsteps++;
// // cout << "inu, nsteps is " << inu << " " << nsteps << "\n";
// x -= stepsize*nnu;
// x2=x*x;
// //cout << "x2 is " << x2 << "\n";
// lon = x.Lon();
// lat = x.Lat();
//
// double ice_thickness=IceThickness(lon,lat);
// if (lon!=lon_old || lat!=lat_old) {
// local_surface = Surface(lon,lat);
//
// //if (lat>COASTLINE)
// //left_edge=1;
//
// rock2=pow((local_surface - IceThickness(lon,lat) - WaterDepth(lon,lat)),2);
// surface2=pow(local_surface,2);
//
// if (ice_model==0) {
// if ((int)(lat)==COASTLINE && rock_previous2 < x2 && surface2 > x2)
// left_edge=1;
// } //if (Crust 2.0)
// } //if (neutrino has stepped into new lon/lat bin)
//
// if (inu==1491 && nsteps<10)
// cout << "inu, x_previous2, rock_previous2, x2, rock2 are " << inu << " " << x_previous2 << " " << rock_previous2 << " " << x2 << " " << rock2 << "\n";
//
// if ((((x_previous2<rock_previous2 && x2>rock2) // crosses rock boundary from above
// || (x_previous2>surface_previous2 && x2<surface2)) && ice_thickness>0 && lat<COASTLINE) // crosses surface boundary from above
// || left_edge) {
// // cout << "lat, COASTLINE, left_edge is " << lat << " " << COASTLINE<< " " << left_edge << "\n";
// //cout << "x_previous2, surface_previous, x2, surface2 are " << x_previous2 << " " << surface_previous2 << " " << x2 << " " << surface2 << "\n";
// r_enterice = x;
// // this gets you out of the loop.
// //continue;
// distance=3*Geoid(lat);
// foundit=1;
// //cout << "foundit is " << foundit << "\n";
// //continue;
// } //if
//
// x_previous = x;
// x_previous2 = x2;
// //cout << "x_previous, x_previous2 " << x << " " << x2 << "\n";
//
// if (lon!=lon_old || lat!=lat_old) {
// rock_previous2 = rock2;
// surface_previous2 = surface2;
// lat_old = lat;
// lon_old = lon;
// } //if
//
// } //while
// if (inu==0) {
// cout << "r_enterice is ";r_enterice.Print();}
// return foundit;
// }//WhereDoesItExitIce
//--------------------------------------------------