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downcontfilterma.1
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downcontfilterma.1
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.\" Automatically generated by Pandoc 2.17.1.1
.\"
.\" Define V font for inline verbatim, using C font in formats
.\" that render this, and otherwise B font.
.ie "\f[CB]x\f[]"x" \{\
. ftr V B
. ftr VI BI
. ftr VB B
. ftr VBI BI
.\}
.el \{\
. ftr V CR
. ftr VI CI
. ftr VB CB
. ftr VBI CBI
.\}
.TH "downcontfilterma" "1" "2021-02-15" "Fortran 95" "SHTOOLS 4.10"
.hy
.SH DownContFilterMA
.PP
Compute the minimum-amplitude downward continuation filter of Wieczorek
and Phillips (1998).
.SH Usage
.PP
\f[V]wl\f[R] = DownContFilterMA (\f[V]l\f[R], \f[V]half\f[R],
\f[V]r\f[R], \f[V]d\f[R])
.SH Parameters
.TP
\f[V]wl\f[R] : output, real(dp)
The amplitude of the downward continuation filter.
.TP
\f[V]l\f[R] : input, integer(int32)
The spherical harmonic degree.
.TP
\f[V]half\f[R] : input, integer(int32)
The spherical harmonic degree where the filter is equal to 0.5.
.TP
\f[V]r\f[R] : input, real(dp)
The reference radius of the gravitational field.
.TP
\f[V]d\f[R] : input, real(dp)
The radius of the surface to downward continue to.
.SH Description
.PP
\f[V]DownContFilterMA\f[R] will calculate the downward continuation
filter of Wieczorek and Phillips (1998; eq.
19) for a given spherical harmonic degree \f[V]l\f[R].
The input parameters include \f[V]half\f[R], which is the degree where
the filter is equal to 0.5, and \f[V]r\f[R] and \f[V]d\f[R], which are
the reference radius of the gravitational field and the radius of the
surface to downward continue to, respectively.
.SH References
.PP
Wieczorek, M.
A.
and R.
J.
Phillips, Potential anomalies on a sphere: applications to the thickness
of the lunar crust, J.
Geophys.
Res., 103, 1715-1724, 1998.
.SH See also
.PP
downcontfiltermc, batohilm batohilmrhoh