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SHReadJPL
Read spherical harmonic coefficients from a JPL ascii-formatted file.
Usage
cilm, lmax, gm = SHReadJPL (filename, lmaxin, [formatstring])
Returns
cilm: float, dimension (2,lmaxin+1,lmaxin+1)- The spherical harmonic coefficients contained in
filename. lmax: integer- The maximum spherical harmonic degree of
cilm. gm: float, dimension(2)- The mass-gravitational constant and error.
Parameters
filename: character(*)- The filename of the JPL ascii-formatted spherical harmonic coefficients.
lmaxin: integer- This spherical harmonic degree controls the dimension of the output array
cilm. The coefficients betweenlmax+1andlmaxinwill be set to zero. formatstring: character*6, optional, default = “E19.12”- The format string used to read the elements of
cilm. The default is “E19.12”.
Description
SHReadJPL will read spherical harmonic coefficients from a JPL ascii formatted file into an array cilm. The real numbers are assumed to be formated with the specifier E19.12, but this can be changed by specifiying the optional string formatstring.
The JPL ascii-formatted file is organized as follows:
- Comment lines starting with “#”.
gm(if a gravitational potential file)- A list of
J_l, which is-cilm[0,l,0]. - A list of the cosine and sine terms.
- The errors of the above (starting at step 2).
See also
shread, shread2, shreadjplerror
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