[Dart-dev] <P>Jump/ Revision: 11361
dart at ucar.edu
dart at ucar.edu
Thu Mar 16 11:15:44 MDT 2017
nancy at ucar.edu
2017-03-16 11:15:42 -0600 (Thu, 16 Mar 2017)
87
documentation for generating sampling error correction
tables for new ensemble sizes.
Added: DART/branches/rma_trunk/assimilation_code/programs/gen_sampling_err_table/gen_sampling_err_table.html
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--- DART/branches/rma_trunk/assimilation_code/programs/gen_sampling_err_table/gen_sampling_err_table.html (rev 0)
+++ DART/branches/rma_trunk/assimilation_code/programs/gen_sampling_err_table/gen_sampling_err_table.html 2017-03-16 17:15:42 UTC (rev 11361)
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+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
+ "http://www.w3.org/TR/html4/strict.dtd">
+<HTML>
+<HEAD>
+<TITLE>program gen_sampling_err_tool</TITLE>
+<link rel="stylesheet" type="text/css" href="../../../documentation/html/doc.css" />
+<link href="../../../documentation/images/dart.ico" rel="shortcut icon" />
+</HEAD>
+<BODY>
+<A NAME="TOP"></A>
+
+<H1>PROGRAM <em class=program>gen_sampling_err_tool</em></H1>
+
+<table border=0 summary="" cellpadding=5>
+<tr>
+ <td valign=middle>
+ <img src="../../../documentation/images/Dartboard7.png" alt="DART project logo" height=70 />
+ </td>
+ <td>
+ <P>Jump to <a href="../../../documentation/index.html">DART Documentation Main Index</a><br />
+ <small><small>version information for this file: <br />
+ <!-- version tag follows, do not edit -->
+ $Id$</small></small>
+ </P></td>
+</tr>
+</table>
+
+<A HREF="#Namelist">NAMELIST</A> /
+<A HREF="#Modules">MODULES</A> /
+<A HREF="#FilesUsed">FILES</A> /
+<A HREF="#References">REFERENCES</A> /
+<A HREF="#Errors">ERRORS</A> /
+<A HREF="#FuturePlans">PLANS</A> /
+<A HREF="#Legalese">TERMS OF USE</A>
+
+<A NAME="Overview"></A>
+<H2>Overview</H2>
+
+<P>
+Utility program which computes a table of values needed
+to apply Sampling Error Correction (SEC) during assimilation.
+These values are used to correct
+covariances based on small sample size statistics.
+See <a href="#References">reference</a> below.
+</P>
+<P>
+The name of the SEC table is always
+<em class=file>sampling_error_correction_table.nc</em>.
+This is a NetCDF format file.
+If this file already exists in the current directory any
+tables for new ensemble sizes will be appended to the existing file.
+If the file does not exist a new file will be created by this tool.
+The resulting file should be copied into the current working
+directory when <em class=program>filter</em> is run.
+</P>
+<P>
+A file with 40 common ensemble sizes is distributed
+with the system. Any new ensemble sizes can be
+generated on demand. Be aware that the computation can
+be time consuming. The job may need to be submitted to
+a batch system if many new ensemble sizes are being
+generated, or start the job on a laptop and leave it
+to run overnight.
+</P>
+<P>
+The file contains a "sparse array" of ensemble sizes.
+Only sizes which have an existing table are stored in
+the file so large ensemble sizes do not require a large
+jump in the size of the output file.
+</P>
+<P>
+This program uses the random number generator to compute
+the correction factors. The generator is seeded with
+the ensemble size so repeated runs of the program will
+generate the same values for the tables.
+</P>
+
+<!--==================================================================-->
+<!--=================== DESCRIPTION OF A NAMELIST ====================-->
+<!--==================================================================-->
+
+<A NAME="Namelist"></A>
+<div class="top">[<a href="#">top</a>]</div><hr />
+<H2>NAMELIST</H2>
+<P>
+This namelist is read from the file <em class=file>input.nml</em>.
+Namelists start with an ampersand
+'&' and terminate with a slash '/'.
+Character strings that contain a '/' must be
+enclosed in quotes to prevent them from
+prematurely terminating the namelist.
+</P>
+
+<div class=namelist>
+<pre>
+&gen_sampling_error_table_nml
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