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/***********************************************/
/**
* @file gravityfield2GravityVector.cpp
*
* @brief Gravity vector on a grid.
*
* @author Torsten Mayer-Guerr
* @date 2025-03-29
*/
/***********************************************/
// Latex documentation
#define DOCSTRING docstring
static const char *docstring = R"(
This program computes gravity vectors from \configClass{gravityfield}{gravityfieldType}
on a \configClass{grid}{gridType} in a global terrestrial reference frame
or alternatively in a local elliposidal frame (north, east, up) if \config{localReferenceFrame} is set.
In \configFile{outputfileGriddedData}{griddedData} the values $[gx, gy, gz]$
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 "files/fileGriddedData.h"
#include "classes/grid/grid.h"
#include "classes/gravityfield/gravityfield.h"
#include "misc/miscGriddedData.h"
/***** CLASS ***********************************/
/** @brief Gravity vector on a grid.
* @ingroup programsGroup */
class Gravityfield2GravityVector
{
public:
void run(Config &config, Parallel::CommunicatorPtr comm);
};
GROOPS_REGISTER_PROGRAM(Gravityfield2GravityVector, PARALLEL, "Gravity vector from gravity field", Gravityfield)
/***********************************************/
void Gravityfield2GravityVector::run(Config &config, Parallel::CommunicatorPtr comm)
{
try
{
FileName fileNameGrid;
GridPtr grid;
GravityfieldPtr gravityfield;
Time time;
Bool useLocalFrame;
Double a, f;
readConfig(config, "outputfileGriddedData", fileNameGrid, Config::MUSTSET, "", "gx, gy, gz");
readConfig(config, "grid", grid, Config::MUSTSET, "", "");
readConfig(config, "gravityfield", gravityfield, Config::MUSTSET, "", "");
readConfig(config, "localReferenceFrame", useLocalFrame, Config::OPTIONAL, "0", "local left handed reference frame (north, east, up)");
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
// -----------
std::vector<Vector3d> points = grid->points();
std::vector<Double> areas = grid->areas();
Ellipsoid ellipsoid(a,f);
// Compute gravity
// ---------------
logStatus<<"compute gravity"<<Log::endl;
std::vector<Vector3d> gravity(points.size());
Parallel::forEach(gravity, [&](UInt i){return gravityfield->gravity(time, points.at(i));}, comm);
if(Parallel::isMaster(comm))
{
std::vector<std::vector<Double>> field(3, std::vector<Double>(points.size()));
for(UInt i=0; i<points.size(); i++)
{
if(useLocalFrame)
gravity.at(i) = localNorthEastUp(points.at(i), ellipsoid).inverseTransform(gravity.at(i));
field.at(0).at(i) = gravity.at(i).x();
field.at(1).at(i) = gravity.at(i).y();
field.at(2).at(i) = gravity.at(i).z();
}
// write results
// -------------
logStatus<<"save values <"<<fileNameGrid<<">"<<Log::endl;
GriddedData griddedData(ellipsoid, points, areas, field);
writeFileGriddedData(fileNameGrid, griddedData);
MiscGriddedData::printStatistics(griddedData);
} // if(Parallel::isMaster(comm))
}
catch(std::exception &e)
{
GROOPS_RETHROW(e)
}
}
/***********************************************/
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