|
Документ взят из кэша поисковой машины. Адрес
оригинального документа
: http://www.stsci.edu/~sontag/spicedocs/cspice/sphlat_c.html
Дата изменения: Sat Dec 17 06:09:42 2005 Дата индексирования: Mon Apr 11 00:09:05 2016 Кодировка: |
Convert from spherical coordinates to latitudinal coordinates.
None.
VARIABLE I/O DESCRIPTION -------- --- -------------------------------------------------- r I Distance of the point from the origin. colat I Angle of the point from positive z axis (radians). lons I Angle of the point from the XZ plane (radians). radius O Distance of a point from the origin lon O Angle of the point from the XZ plane in radians lat O Angle of the point from the XY plane in radians
r Distance of the point from the origin.
colat Angle between the vector from the origin to the point
and the positive z axis in radians.
lons Angle of the point from the XZ plane (radians).
radius Distance of a point from the origin lon Angle of the point from the XZ plane in radians lat Angle of the point from the XY plane in radians
None.
This routine returns the latitudinal coordinates of a point whose position is input in spherical coordinates. Latitudinal coordinates are defined by a distance from a central reference point, an angle from a reference meridian, and an angle above the equator of a sphere centered at the central reference point. Spherical coordinates are defined by a distance from a central reference point, an angle from a reference meridian, and an angle from the z-axis.
Latitude is obtained by subtracting co-latitude from HALFPI()
Radius and longitude mean the same thing in both latitudinal
and spherical coordinates. The table below lists lat and
corresponding colat in terms of degrees.
lat colat
------ ------
0 90
20 70
45 45
-30 120
90 0
-45 135
None.
Error free.
None.
W.L. Taber (JPL)
None.
-CSPICE Version 1.0.0, 08-FEB-1998 (EDW)
spherical to latitudinal coordinates