Definitions

Trying to list all of the datatypes, and constants definitions used in the geomajis library.

Datatype related

Datatypes definitions

group Type (re)-definitions

Type definitions for various data structures used in Geomajis.

This section includes typedefs for rotation matrices, position vectors, angles, state vectors, and other commonly used data structures.

Note

Type definitions through “using” instead of “typedef” for C++11 compatibility.

Typedefs

using SpiceRotMat = SpiceDouble[3][3]

Type definition for a 3x3 rotation matrix.

using SpiceDblDbl = SpiceDouble[2]

Type definition for a 2-element double array.

using SpiceVecDbl = SpiceDouble[3]

Type definition for a 3-element double array.

using SpiceVecFlt = SpiceDouble[3]

Type definition for a 3-element float array.

using SpicePos_LT = SpiceDouble[4]

Type definition for a 4-element double array: a position vector, and the light time wrt an observer.

This is used to represent a position vector in the form of [x, y, z, lt], where X, Y, Z are the Cartesian coordinates (in km) and lt the light time wrt. an observer; or [r, lat, lon, lt] where r is the radial distance, lat is the latitude, lon is the longitude (in radians).

using SpiceAngles = SpiceDouble[4]

Type definition for a 4-element double array, firstly the phase, incidence and emission angles. The last elementis either the azimuth angle or the solar elongation.

using Spice_State = SpiceDouble[6]

Type definition for a 6-element double array: position and velocity vector.

This is used to represent a state vector in the form of [x, y, z, vx, vy, vz], where X, Y, Z are the Cartesian coordinates (in km) and Vx, Vy, Vz are the corresponding velocity components (in km/s).

using SpiceVecInt = SpiceInt[3]

Type definition for a 3-element integer array.

using SpiceVecLon = SpiceLong[3]

Type definition for a 3-element long integer array.

using SpiceSmlStr = SpiceChar[32]

Type definition for a character array of size 32.

Datatypes byte sizes

group Constants - data type size

Constants defining the byte sizes of various data types used in Geomajis.

Defines

sz_int_

Size of SpiceInt in bytes.

sz_long

Size of SpiceLong in bytes.

sz_char

Size of SpiceChar in bytes.

sz_dbl_

Size of SpiceDouble in bytes.

sz_bool

Size of SpiceBoolean in bytes.

sz_vdbl

Size of SpiceVecDbl in bytes.

sz_vplt

Size of SpicePos_LT in bytes.

Numerical constants

group Constants - numerical

Defining several numerical constants used throughout the Geomajis project.

Defines

dpi

Value of Pi (double precision)

ipi

Value of 1/Pi (double precision)

dradg

Conversion factor from radians to degrees (double precision)

iradg

Conversion factor from degrees to radians (double precision)

pi_4

Value of Pi/4 (double precision)

pi_3

Value of Pi/3 (double precision)

pi_2

Value of Pi/2 (double precision)

vem1

Value of -0.99999999999 (double precision)

max(a, b)

Returns the maximum of two values.

min(a, b)

Returns the minimum of two values.

Physical constants

group Constants - physical

Some useful physical constants.

Defines

lspd

Speed of light in km/s (exact, nist 2022)

MAJIS instrument constants

group Constants - MAJIS

Constants specific to the Majis instrument on the JUICE mission.

Defines

mfactor

Scanning mirror rotation value per step of the resolver motor (in degrees).