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17<h3 style="line-height: 100%;">4.5 Data analysis and visualization<br>
19<p style="line-height: 100%;">PALM is able to output
20data of different quantities as time series,
21vertical profiles (usually horizontally averaged), two-dimensional
22cross sections or <font color="#000000">3d-volume data.</font>
23Depending on the kind of output (time series, profiles, etc.) and the output format (ASCII&nbsp; or binary) data are written
24to different files (file descriptions can be found in
25<a href="../app/chapter_3.4.html">chapter
263.4</a>). By default, all data
27output files are in NetCDF format (link to the NetCDF documentations in
28the Internet and on the PALM homepage), which can be processed by many
29public domain and commercial (graphic) software. Data from NetCDF files
30can also be easily read from FORTRAN programs provided that a NetCDF
31library is available. More detailed informations about the
32PALM-NetCDF-output is given in the next subchapter (<a href="../app/chapter_4.5.1.html">4.5.1</a>).</p>
34<p style="line-height: 100%;">Due to historical reasons, PALM can also
35output data in other formats suitable for some special graphic
36software. The exact format of these files corresponds to the
37requirements of the respective software. Still available at IMUK are <a href="">profil</a>
38(time series, profiles), <a href="">iso2d</a>
39(2d cross sections) and <b>AVS</b> (e.g. iso-surfaces of 3d volume
40data). The special files created by PALM can be directly used
41as input files for these plot programs. Beyond that, <b>profil</b> and
42<b>iso2d</b> need additional information
43about the plot layout (e.g. titles, axes labels, arrangement of the
44coordinate systems, etc.) provided by so-called parameter files<font color="#800000">.
45</font><font color="#000000">Thes</font>e files are also created by
46the PALM, providing a default layout (e.g. plots produced by <b>iso2d</b>
47show. only isolines and no color shading). Within certain
48limits the plot layout can be steered by some PALM parameters.
49Beyond that the user can edit the parameter files created by PALM and
50change, supplement or remove the given default values
51according to his needs. Beside the file with the (binary) data to be
52visualized, <b>AVS</b> additionally needs a file with
53coordinate information (likewise binary) and an ASCII file in the
54so-called FLD format, which describes the structure of the two binary
55files. Coordinate and FLD file are also created by the PALM. However,
56with <b>AVS</b> (differently than with <b>profile</b> or <b>iso2d</b>)
57the plot layout must always be additionally designed by the user
58with the help of the AVS network editor. &nbsp;</p>
61<p style="line-height: 100%;">In the following subchapters, steering
62of the different data output and how to create plots of the data is
63described by some examples. Not all details of steering
64are mentioned. If necessary, these can be found within the
65description of the respective parameters.<br>
68&nbsp;For most purposes it should be sufficient to read <a href="../app/chapter_4.5.1.html">chapter 4.5.1</a> which explains the PALM-NetCDF-output.<hr>
69<p style="line-height: 100%;"><br>
70<font color="#000080"><font color="#000080"><a href="chapter_4.4.html"><font color="#000080"><img src="left.gif" name="Grafik1" align="bottom" border="2" height="32" width="32"></font></a><a href="index.html"><font color="#000080"><img src="up.gif" name="Grafik2" align="bottom" border="2" height="32" width="32"></font></a><a href="chapter_4.5.1.html"><font color="#000080"><img src="right.gif" name="Grafik3" align="bottom" border="2" height="32" width="32"></font></a></font></font></p>
71<p style="line-height: 100%;">&nbsp;<span style="font-style: italic;">Last
72change:</span> 05/03/05 (SR)<br>
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