Module: GeomagnetismHeader¶

Defines

_POSIX_C_SOURCE¶

GEOMAGHEADER_H¶

READONLYMODE¶

MAXLINELENGTH¶

NOOFPARAMS¶

NOOFCOEFFICIENTS¶

_DEGREE_NOT_FOUND¶

CALCULATE_NUMTERMS(N)¶

INCL_ERROR_BASE¶

DECL_ERROR_OFFSET_BASE¶

F_ERROR_BASE¶

DECL_ERROR_SLOPE_BASE¶

WMM_ERROR_MULTIPLIER¶

IGRF_ERROR_MULTIPLIER¶

WMM_UNCERTAINTY_F¶

WMM_UNCERTAINTY_H¶

WMM_UNCERTAINTY_X¶

WMM_UNCERTAINTY_Y¶

WMM_UNCERTAINTY_Z¶

WMM_UNCERTAINTY_I¶

WMM_UNCERTAINTY_D_OFFSET¶

WMM_UNCERTAINTY_D_COEF¶

M_PI¶

RAD2DEG(rad)¶

DEG2RAD(deg)¶

ATanH(x)¶

TRUE¶

FALSE¶

MAG_PS_MIN_LAT_DEGREE¶

MAG_PS_MAX_LAT_DEGREE¶

MAG_UTM_MIN_LAT_DEGREE¶

MAG_UTM_MAX_LAT_DEGREE¶

MAG_GEO_POLE_TOLERANCE¶

MAG_USE_GEOID¶

LAT_BOUND_MIN¶

LAT_BOUND_MAX¶

LON_BOUND_MIN¶

LON_BOUND_MAX¶

ALT_BOUND_MIN¶

NO_ALT_MAX¶

USER_GAVE_UP¶

WGS84ON¶

MSLON¶

MODEL_RELEASE_DATE¶

VERSIONDATE_LARGE¶

Enums

enum MAGenum_Comp¶

Values:

enumerator DECLINATION¶

enumerator INCLINATION¶

enumerator HOR_INTENSITY¶

enumerator TOTAL_INTENSITY¶

enumerator X_COMPONENT¶

enumerator Y_COMPONENT¶

enumerator Z_COMPONENT¶

enumerator ALL¶

enum PARAMS¶

Values:

enumerator SHDF¶

enumerator MODELNAME¶

enumerator PUBLISHER¶

enumerator RELEASEDATE¶

enumerator DATACUTOFF¶

enumerator MODELSTARTYEAR¶

enumerator MODELENDYEAR¶

enumerator EPOCH¶

enumerator INTSTATICDEG¶

enumerator INTSECVARDEG¶

enumerator EXTSTATICDEG¶

enumerator EXTSECVARDEG¶

enumerator GEOMAGREFRAD¶

enumerator NORMALIZATION¶

enumerator SPATBASFUNC¶

enum COEFFICIENTS¶

Values:

enumerator IE¶

enumerator N¶

enumerator M¶

enumerator GNM¶

enumerator HNM¶

enumerator DGNM¶

enumerator DHNM¶

enum YYYYMMDD¶

Values:

enumerator YEAR¶

enumerator MONTH¶

enumerator DAY¶

Functions

int MAG_Geomag(MAGtype_Ellipsoid Ellip, MAGtype_CoordSpherical CoordSpherical, MAGtype_CoordGeodetic CoordGeodetic, MAGtype_MagneticModel *TimedMagneticModel, MAGtype_GeoMagneticElements *GeoMagneticElements)¶

void MAG_Gradient(MAGtype_Ellipsoid Ellip, MAGtype_CoordGeodetic CoordGeodetic, MAGtype_MagneticModel *TimedMagneticModel, MAGtype_Gradient *Gradient)¶

int MAG_robustReadMagneticModel_Large(char *filename, char *filenameSV, MAGtype_MagneticModel **MagneticModel)¶

int MAG_robustReadMagModels(char *filename, MAGtype_MagneticModel *(*magneticmodels)[1], int array_size)¶

int MAG_SetDefaults(MAGtype_Ellipsoid *Ellip, MAGtype_Geoid *Geoid)¶

void MAG_Error(int control)¶

int MAG_GetUserGrid(MAGtype_CoordGeodetic *minimum, MAGtype_CoordGeodetic *maximum, double *step_size, double *a_step_size, double *step_time, MAGtype_Date *StartDate, MAGtype_Date *EndDate, int *ElementOption, int *PrintOption, char *OutputFile, MAGtype_Geoid *Geoid)¶

int MAG_GetUserInput(MAGtype_MagneticModel *MagneticModel, MAGtype_Geoid *Geoid, MAGtype_CoordGeodetic *CoordGeodetic, MAGtype_Date *MagneticDate)¶

void MAG_PrintGradient(MAGtype_Gradient Gradient)¶

void MAG_PrintUserData(MAGtype_GeoMagneticElements GeomagElements, MAGtype_CoordGeodetic SpaceInput, MAGtype_Date TimeInput, MAGtype_MagneticModel *MagneticModel, MAGtype_Geoid *Geoid)¶

int MAG_ValidateDMSstring(char *input, int min, int max, char *Error)¶

int MAG_Warnings(int control, double value, MAGtype_MagneticModel *MagneticModel)¶

MAGtype_LegendreFunction *MAG_AllocateLegendreFunctionMemory(int NumTerms)¶

MAGtype_MagneticModel *MAG_AllocateModelMemory(int NumTerms)¶

MAGtype_SphericalHarmonicVariables *MAG_AllocateSphVarMemory(int nMax)¶

void MAG_AssignHeaderValues(MAGtype_MagneticModel *model, char values[][MAXLINELENGTH])¶

void MAG_AssignMagneticModelCoeffs(MAGtype_MagneticModel *Assignee, MAGtype_MagneticModel *Source, int nMax, int nMaxSecVar)¶

int MAG_FreeMemory(MAGtype_MagneticModel *MagneticModel, MAGtype_MagneticModel *TimedMagneticModel, MAGtype_LegendreFunction *LegendreFunction)¶

int MAG_FreeLegendreMemory(MAGtype_LegendreFunction *LegendreFunction)¶

int MAG_FreeMagneticModelMemory(MAGtype_MagneticModel *MagneticModel)¶

int MAG_FreeSphVarMemory(MAGtype_SphericalHarmonicVariables *SphVar)¶

void MAG_PrintWMMFormat(char *filename, MAGtype_MagneticModel *MagneticModel)¶

void MAG_PrintEMMFormat(char *filename, char *filenameSV, MAGtype_MagneticModel *MagneticModel)¶

void MAG_PrintSHDFFormat(char *filename, MAGtype_MagneticModel *(*MagneticModel)[1], int epochs)¶

int MAG_readMagneticModel(char *filename, MAGtype_MagneticModel *MagneticModel)¶

int MAG_readMagneticModel_Large(char *filename, char *filenameSV, MAGtype_MagneticModel *MagneticModel)¶

int MAG_readMagneticModel_SHDF(char *filename, MAGtype_MagneticModel *(*magneticmodels)[1], int array_size)¶

char *MAG_Trim(char *str)¶

void MAG_BaseErrors(double DeclCoef, double DeclBaseline, double InclOffset, double FOffset, double Multiplier, double H, double *DeclErr, double *InclErr, double *FErr)¶

int MAG_CalculateGeoMagneticElements(MAGtype_MagneticResults *MagneticResultsGeo, MAGtype_GeoMagneticElements *GeoMagneticElements)¶

void MAG_CalculateGradientElements(MAGtype_MagneticResults GradResults, MAGtype_GeoMagneticElements MagneticElements, MAGtype_GeoMagneticElements *GradElements)¶

int MAG_CalculateSecularVariationElements(MAGtype_MagneticResults MagneticVariation, MAGtype_GeoMagneticElements *MagneticElements)¶

int MAG_CalculateGridVariation(MAGtype_CoordGeodetic location, MAGtype_GeoMagneticElements *elements)¶

void MAG_CartesianToGeodetic(MAGtype_Ellipsoid Ellip, double x, double y, double z, MAGtype_CoordGeodetic *CoordGeodetic)¶

MAGtype_CoordGeodetic MAG_CoordGeodeticAssign(MAGtype_CoordGeodetic CoordGeodetic)¶

int MAG_DateToYear(MAGtype_Date *Calendar_Date, char *Error)¶

void MAG_DegreeToDMSstring(double DegreesOfArc, int UnitDepth, char *DMSstring)¶

void MAG_DMSstringToDegree(char *DMSstring, double *DegreesOfArc)¶

void MAG_ErrorCalc(MAGtype_GeoMagneticElements B, MAGtype_GeoMagneticElements *Errors)¶

int MAG_GeodeticToSpherical(MAGtype_Ellipsoid Ellip, MAGtype_CoordGeodetic CoordGeodetic, MAGtype_CoordSpherical *CoordSpherical)¶

MAGtype_GeoMagneticElements MAG_GeoMagneticElementsAssign(MAGtype_GeoMagneticElements Elements)¶

MAGtype_GeoMagneticElements MAG_GeoMagneticElementsScale(MAGtype_GeoMagneticElements Elements, double factor)¶

MAGtype_GeoMagneticElements MAG_GeoMagneticElementsSubtract(MAGtype_GeoMagneticElements minuend, MAGtype_GeoMagneticElements subtrahend)¶

int MAG_GetTransverseMercator(MAGtype_CoordGeodetic CoordGeodetic, MAGtype_UTMParameters *UTMParameters)¶

int MAG_GetUTMParameters(double Latitude, double Longitude, int *Zone, char *Hemisphere, double *CentralMeridian)¶

int MAG_isNaN(double d)¶

int MAG_RotateMagneticVector(MAGtype_CoordSpherical, MAGtype_CoordGeodetic CoordGeodetic, MAGtype_MagneticResults MagneticResultsSph, MAGtype_MagneticResults *MagneticResultsGeo)¶

void MAG_SphericalToCartesian(MAGtype_CoordSpherical CoordSpherical, double *x, double *y, double *z)¶

void MAG_SphericalToGeodetic(MAGtype_Ellipsoid Ellip, MAGtype_CoordSpherical CoordSpherical, MAGtype_CoordGeodetic *CoordGeodetic)¶

void MAG_TMfwd4(double Eps, double Epssq, double K0R4, double K0R4oa, double Acoeff[], double Lam0, double K0, double falseE, double falseN, int XYonly, double Lambda, double Phi, double *X, double *Y, double *pscale, double *CoM)¶

int MAG_YearToDate(MAGtype_Date *Date)¶

int MAG_AssociatedLegendreFunction(MAGtype_CoordSpherical CoordSpherical, int nMax, MAGtype_LegendreFunction *LegendreFunction)¶

int MAG_CheckGeographicPole(MAGtype_CoordGeodetic *CoordGeodetic)¶

int MAG_ComputeSphericalHarmonicVariables(MAGtype_Ellipsoid Ellip, MAGtype_CoordSpherical CoordSpherical, int nMax, MAGtype_SphericalHarmonicVariables *SphVariables)¶

void MAG_GradY(MAGtype_Ellipsoid Ellip, MAGtype_CoordSpherical CoordSpherical, MAGtype_CoordGeodetic CoordGeodetic, MAGtype_MagneticModel *TimedMagneticModel, MAGtype_GeoMagneticElements GeoMagneticElements, MAGtype_GeoMagneticElements *GradYElements)¶

void MAG_GradYSummation(MAGtype_LegendreFunction *LegendreFunction, MAGtype_MagneticModel *MagneticModel, MAGtype_SphericalHarmonicVariables SphVariables, MAGtype_CoordSpherical CoordSpherical, MAGtype_MagneticResults *GradY)¶

int MAG_PcupHigh(double *Pcup, double *dPcup, double x, int nMax)¶

int MAG_PcupLow(double *Pcup, double *dPcup, double x, int nMax)¶

int MAG_SecVarSummation(MAGtype_LegendreFunction *LegendreFunction, MAGtype_MagneticModel *MagneticModel, MAGtype_SphericalHarmonicVariables SphVariables, MAGtype_CoordSpherical CoordSpherical, MAGtype_MagneticResults *MagneticResults)¶

int MAG_SecVarSummationSpecial(MAGtype_MagneticModel *MagneticModel, MAGtype_SphericalHarmonicVariables SphVariables, MAGtype_CoordSpherical CoordSpherical, MAGtype_MagneticResults *MagneticResults)¶

int MAG_Summation(MAGtype_LegendreFunction *LegendreFunction, MAGtype_MagneticModel *MagneticModel, MAGtype_SphericalHarmonicVariables SphVariables, MAGtype_CoordSpherical CoordSpherical, MAGtype_MagneticResults *MagneticResults)¶

int MAG_SummationSpecial(MAGtype_MagneticModel *MagneticModel, MAGtype_SphericalHarmonicVariables SphVariables, MAGtype_CoordSpherical CoordSpherical, MAGtype_MagneticResults *MagneticResults)¶

int MAG_TimelyModifyMagneticModel(MAGtype_Date UserDate, MAGtype_MagneticModel *MagneticModel, MAGtype_MagneticModel *TimedMagneticModel)¶

int MAG_ConvertGeoidToEllipsoidHeight(MAGtype_CoordGeodetic *CoordGeodetic, MAGtype_Geoid *Geoid)¶

int MAG_GetGeoidHeight(double Latitude, double Longitude, double *DeltaHeight, MAGtype_Geoid *Geoid)¶

void MAG_EquivalentLatLon(double lat, double lon, double *repairedLat, double *repairedLon)¶

void MAG_WMMErrorCalc(double H, MAGtype_GeoMagneticElements *Uncertainty)¶

void MAG_PrintUserDataWithUncertainty(MAGtype_GeoMagneticElements GeomagElements, MAGtype_GeoMagneticElements Errors, MAGtype_CoordGeodetic SpaceInput, MAGtype_Date TimeInput, MAGtype_MagneticModel *MagneticModel, MAGtype_Geoid *Geoid)¶

void MAG_GetDeg(char *Query_String, double *latitude, double bounds[2])¶

int MAG_GetAltitude(char *Query_String, MAGtype_Geoid *Geoid, MAGtype_CoordGeodetic *coords, int bounds[2], int AltitudeSetting)¶

struct MAGtype_MagneticModel¶

#include <GeomagnetismHeader.h>

structure definition

Public Members

double EditionDate¶: variable

double epoch¶: Base time of Geomagnetic model epoch (yrs)

char ModelName[32]¶: variable

double *Main_Field_Coeff_G¶: C - Gauss coefficients of main geomagnetic model (nT) Index is (n * (n + 1) / 2 + m)

double *Main_Field_Coeff_H¶: C - Gauss coefficients of main geomagnetic model (nT)

double *Secular_Var_Coeff_G¶: CD - Gauss coefficients of secular geomagnetic model (nT/yr)

double *Secular_Var_Coeff_H¶: CD - Gauss coefficients of secular geomagnetic model (nT/yr)

int nMax¶: Maximum degree of spherical harmonic model

int nMaxSecVar¶: Maximum degree of spherical harmonic secular model

int SecularVariationUsed¶: Whether or not the magnetic secular variation vector will be needed by program

double CoefficientFileEndDate¶: variable

struct MAGtype_Ellipsoid¶

#include <GeomagnetismHeader.h>

structure definition

Public Members

double a¶: semi-major axis of the ellipsoid

double b¶: semi-minor axis of the ellipsoid

double fla¶: flattening

double epssq¶: first eccentricity squared

double eps¶: first eccentricity

double re¶: mean radius of ellipsoid

struct MAGtype_CoordGeodetic¶

#include <GeomagnetismHeader.h>

structure definition

Public Members

double lambda¶: longitude

double phi¶: geodetic latitude

double HeightAboveEllipsoid¶: height above the ellipsoid (HaE)

double HeightAboveGeoid¶: (height above the EGM96 geoid model )

int UseGeoid¶: variable

struct MAGtype_CoordSpherical¶

#include <GeomagnetismHeader.h>

structure definition

Public Members

double lambda¶: longitude

double phig¶: geocentric latitude

double r¶: distance from the center of the ellipsoid

struct MAGtype_Date¶

#include <GeomagnetismHeader.h>

structure definition

Public Members

int Year¶: variable

int Month¶: variable

int Day¶: variable

double DecimalYear¶: decimal years

struct MAGtype_LegendreFunction¶

#include <GeomagnetismHeader.h>

structure definition

Public Members

double *Pcup¶: Legendre Function

double *dPcup¶: Derivative of Legendre fcn

struct MAGtype_MagneticResults¶

#include <GeomagnetismHeader.h>

structure definition

Public Members

double Bx¶: North

double By¶: East

double Bz¶: Down

struct MAGtype_SphericalHarmonicVariables¶

#include <GeomagnetismHeader.h>

structure definition

Public Members

double *RelativeRadiusPower¶: [earth_reference_radius_km / sph. radius ]^n

double *cos_mlambda¶: cp(m) - cosine of (m*spherical coord. longitude)

double *sin_mlambda¶: sp(m) - sine of (m*spherical coord. longitude)

struct MAGtype_GeoMagneticElements¶

#include <GeomagnetismHeader.h>

structure definition

Public Members

double Decl¶

Angle between the magnetic field vector and true north, positive east

double Incl¶

Angle between the magnetic field vector and the horizontal plane, positive down

double F¶

Magnetic Field Strength

double H¶

Horizontal Magnetic Field Strength

double X¶

Northern component of the magnetic field vector

double Y¶

Eastern component of the magnetic field vector

double Z¶

Downward component of the magnetic field vector

double GV¶

The Grid Variation

double Decldot¶

Yearly Rate of change in declination

double Incldot¶

Yearly Rate of change in inclination

double Fdot¶

Yearly rate of change in Magnetic field strength

double Hdot¶

Yearly rate of change in horizontal field strength

double Xdot¶

Yearly rate of change in the northern component

double Ydot¶

Yearly rate of change in the eastern component

double Zdot¶

Yearly rate of change in the downward component

double GVdot¶

Yearly rate of change in grid variation

struct MAGtype_Geoid¶

#include <GeomagnetismHeader.h>

structure definition

Public Members

int NumbGeoidCols¶: 360 degrees of longitude at 15 minute spacing

int NumbGeoidRows¶: 180 degrees of latitude at 15 minute spacing

int NumbHeaderItems¶: min, max lat, min, max long, lat, long spacing

int ScaleFactor¶: 4 grid cells per degree at 15 minute spacing

float *GeoidHeightBuffer¶: variable

int NumbGeoidElevs¶: variable

int Geoid_Initialized¶: indicates successful initialization

int UseGeoid¶: Is the Geoid being used?

struct MAGtype_Gradient¶

#include <GeomagnetismHeader.h>

structure definition

Public Members

int UseGradient¶: variable

MAGtype_GeoMagneticElements GradPhi¶: phi

MAGtype_GeoMagneticElements GradLambda¶: lambda

MAGtype_GeoMagneticElements GradZ¶: variable

struct MAGtype_CoordGeodeticStr¶

#include <GeomagnetismHeader.h>

structure definition

Public Members

char Longitude[40]¶: variable

char Latitude[40]¶: variable

struct MAGtype_UTMParameters¶

#include <GeomagnetismHeader.h>

structure definition

Public Members

double Easting¶: (X) in meters

double Northing¶: (Y) in meters

int Zone¶: UTM Zone

char HemiSphere¶: variable

double CentralMeridian¶: variable

double ConvergenceOfMeridians¶: variable

double PointScale¶: variable