/
downcontfilterma.html
77 lines (66 loc) · 3.56 KB
/
downcontfilterma.html
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title>SHTOOLS - Gravity and magnetics routines</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<link rel="stylesheet" type="text/css" href="../../css/sh.css">
<link rel="icon" type="image/vnd.microsoft.icon" href="../../images/favicon.ico">
</head>
<body>
<div class="main">
<p class="centeredimage"><img src="../../images/logo.jpg" width=894 height=135 alt="SHTOOLS --- Tools for working with spherical harmonics"></p>
<table class="menu">
<tbody>
<tr>
<td><a href="http://shtools.ipgp.fr/">HOME</a></td>
<td><a href="https://github.com/SHTOOLS/SHTOOLS/releases">DOWNLOAD</a></td>
<td class="selected"><a href="../../documentation.html">DOCUMENTATION</a></td>
<td><a href="../../faq.html">FAQ</a> </td>
</tr>
</tbody>
</table>
<p class="dir">
> <a href="../../../index.html" class="dir">Home</a> > <a href="../../documentation.html" class="dir">Documentation</a> > <a href="../../f95-routines.html" class="dir">Fortran 95</a> > <a href="../../gravmag.html" class="dir">Gravity and Magnetics</a></p>
<h1 id="downcontfilterma">DownContFilterMA</h1>
<p>Compute the minimum-amplitude downward continuation filter of Wieczorek and Phillips (1998).</p>
<h1 id="usage">Usage</h1>
<p><code>wl</code> = DownContFilterMa (<code>l</code>, <code>half</code>, <code>r</code>, <code>d</code>)</p>
<h1 id="parameters">Parameters</h1>
<dl>
<dt><code>wl</code> : output, real*8</dt>
<dd>The amplitude of the downward continuation filter.
</dd>
<dt><code>l</code> : input, integer</dt>
<dd>The spherical harmonic degree.
</dd>
<dt><code>half</code> : input, integer</dt>
<dd>The spherical harmonic degree where the filter is equal to 0.5.
</dd>
<dt><code>r</code> : input, real*8</dt>
<dd>The reference radius of the gravitational field.
</dd>
<dt><code>d</code> : input, real*8</dt>
<dd>The radius of the surface to downward continue to.
</dd>
</dl>
<h1 id="description">Description</h1>
<p><code>DownContFilterMA</code> will calculate the downward continuation filter of Wieczorek and Phillips (1998; eq. 19) for a given spherical harmonic degree <code>l</code>. The input parameters include <code>half</code>, which is the degree where the filter is equal to 0.5, and <code>r</code> and <code>d</code>, which are the reference radius of the gravitational field and the radius of the surface to downward continue to, respectively.</p>
<h1 id="references">References</h1>
<p>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.</p>
<h1 id="see-also">See also</h1>
<p><a href="downcontfiltermc.html">downcontfiltermc</a>, <a href="batohilm.html">batohilm</a> <a href="batohilmrhoh.html">batohilmrhoh</a></p>
<p class="dir">
> <a href="../../../index.html" class="dir">Home</a> > <a href="../../documentation.html" class="dir">Documentation</a> > <a href="../../f95-routines.html" class="dir">Fortran 95</a> > <a href="../../gravmag.html" class="dir">Gravity and Magnetics</a></p>
<table class="footer2" summary = "SHTOOLS; Fortran and Python spherical harmonic transform software package">
<tbody>
<tr>
<td class="c1"><a href="http://www.ipgp.fr/">Institut de Physique du Globe de Paris</a></td>
<td class="c2"><a href="http://www.sorbonne-paris-cite.fr/index.php/en">University of Sorbonne Paris Cité</a></td>
<td class="c3">© 2016 <a href="https://github.com/SHTOOLS">SHTOOLS</a></td>
</tr>
</tbody>
</table>
</div>
</body>
</html>