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/***********************************************/
/**
* @file gravityfield2Deflections.cpp
*
* @brief Deflections of the vertical on a grid.
*
* @author Christian Pock
* @date 2012-06-05
*/
/***********************************************/
// Latex documentation
#define DOCSTRING docstring
static const char *docstring = R"(
This program computes the deflections of the vertical $\xi$ in north direction
and $\eta$ in east direction in radian
according to
\begin{equation}
\xi = g_x/\gamma \qquad\text{and}\qquad \eta=g_y/\gamma,
\end{equation}
where $\M g=\nabla V$ is the gravity vector from \configClass{gravityfield}{gravityfieldType} in
the local ellipsoidal system (north, east, up) and $\gamma$ is the normal gravity at that point.
The values will be saved together with points expressed as ellipsoidal coordinates (longitude, latitude, height)
based on a reference ellipsoid with parameters \config{R} and \config{inverseFlattening}.
)";
/***********************************************/
#include "programs/program.h"
#include "base/planets.h"
#include "files/fileGriddedData.h"
#include "classes/grid/grid.h"
#include "classes/gravityfield/gravityfield.h"
#include "misc/miscGriddedData.h"
/***** CLASS ***********************************/
/** @brief Deflections of the vertical on a grid.
* @ingroup programsGroup */
class Gravityfield2Deflections
{
public:
void run(Config &config, Parallel::CommunicatorPtr comm);
};
GROOPS_REGISTER_PROGRAM(Gravityfield2Deflections, PARALLEL, "Deflections of the vertical - based on gravity field", Gravityfield)
/***********************************************/
void Gravityfield2Deflections::run(Config &config, Parallel::CommunicatorPtr comm)
{
try
{
FileName fileNameGrid;
GridPtr grid;
GravityfieldPtr gravityfield;
Time time;
Double a, f;
readConfig(config, "outputfileGriddedData", fileNameGrid, Config::MUSTSET, "", "xi (north), eta (east) [rad]");
readConfig(config, "grid", grid, Config::MUSTSET, "", "");
readConfig(config, "gravityfield", gravityfield, Config::MUSTSET, "", "");
readConfig(config, "time", time, Config::OPTIONAL, "", "at this time the gravity field will be evaluated");
readConfig(config, "R", a, Config::DEFAULT, STRING_DEFAULT_GRS80_a, "reference radius for ellipsoidal coordinates on output");
readConfig(config, "inverseFlattening", f, Config::DEFAULT, STRING_DEFAULT_GRS80_f, "reference flattening for ellipsoidal coordinates on output, 0: spherical coordinates");
if(isCreateSchema(config)) return;
// create grid
// -----------
Ellipsoid ellipsoid(a,f);
std::vector<Vector3d> points = grid->points();
std::vector<Double> areas = grid->areas();
// Compute deflections
// ------------------
logStatus<<"compute deflections of the vertical"<<Log::endl;
std::vector<Vector3d> g(points.size());
Parallel::forEach(g, [&](UInt i)
{
return localNorthEastUp(points.at(i), ellipsoid).inverseTransform(gravityfield->gravity(time, points.at(i)))/Planets::normalGravity(points.at(i));
}, comm);
if(Parallel::isMaster(comm))
{
std::vector<std::vector<Double>> field(2, std::vector<Double>(points.size()));
for(UInt i=0; i<points.size(); i++)
{
field.at(0).at(i) = g.at(i).x();
field.at(1).at(i) = g.at(i).y();
}
logStatus<<"save values <"<<fileNameGrid<<">"<<Log::endl;
GriddedData griddedData(Ellipsoid(a,f), points, areas, field);
writeFileGriddedData(fileNameGrid, griddedData);
MiscGriddedData::printStatistics(griddedData);
} // if(Parallel::isMaster(comm))
}
catch(std::exception &e)
{
GROOPS_RETHROW(e)
}
}
/***********************************************/
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