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<section id="asa-im-decode">
<span id="index-0"></span><h1>asa_im_decode<a class="headerlink" href="#asa-im-decode" title="Permalink to this headline"></a></h1>
<section id="synopsis">
<h2>Synopsis<a class="headerlink" href="#synopsis" title="Permalink to this headline"></a></h2>
<p><strong>asa_im_decode</strong> <em><asa_im> <asa_ins> <out> <outType> <near_range></em></p>
</section>
<section id="description">
<h2>Description<a class="headerlink" href="#description" title="Permalink to this headline"></a></h2>
<p><strong>asa_im_decode</strong> Decodes Envisat ASAR Image Mode Level 0 data.</p>
<p><em>asa_im_decode v1.1 by smb</em></p>
</section>
<section id="required-arguments">
<h2>Required Arguments<a class="headerlink" href="#required-arguments" title="Permalink to this headline"></a></h2>
<p><em>asa_im</em></p>
<blockquote>
<div><p>Input image file(s) (multiple files if merging along-track)</p>
</div></blockquote>
<p><em>asa_ins</em></p>
<blockquote>
<div><p>Input auxilary instrument characterization data file</p>
</div></blockquote>
<p><em>out</em></p>
<blockquote>
<div><p>Output raw data file. <strong>out</strong> is a complex file with no headers (byte/float I1, byte/float Q1, byte/float I2, byte/float Q2, …)</p>
</div></blockquote>
<p><em>outType</em></p>
<blockquote>
<div><p>Output file type (1=byte,4=float). If outType is byte, then the decoded floats are multiplied by 127.5, shifted by 127.5, rounded to the nearest integer and limited to the range 0-255.</p>
</div></blockquote>
<p><em>near_range</em></p>
<blockquote>
<div><p>Near range to which to align all lines (0=use first line near range)</p>
</div></blockquote>
</section>
<section id="notes">
<h2>Notes<a class="headerlink" href="#notes" title="Permalink to this headline"></a></h2>
<p>Starting range computed as (rank*pri+windowStartTime)*c/2 where rank is the number of pri between transmitted pulse and return echo</p>
<p>Calibration/noise lines are replaced with previous echo data line</p>
<p>Missing lines within a data set and between adjacent along-track data sets are filled with zeroes in float mode and 0.*127.5+127.5 + .5 = 128 for byte mode</p>
<p>Auxilary data files can be found at <a class="reference external" href="http://envisat.esa.int/services/auxiliary_data/asar/">http://envisat.esa.int/services/auxiliary_data/asar/</a></p>
<p>Envisat ASAR Product Handbook, Issue 1.1, 1 December 2002 can be found at <a class="reference external" href="http://envisat.esa.int/dataproducts/asar/CNTR6-3-6.htm#eph.asar.asardf.0pASA_IM__0P">http://envisat.esa.int/dataproducts/asar/CNTR6-3-6.htm#eph.asar.asardf.0pASA_IM__0P</a></p>
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<section id="example">
<h2>Example<a class="headerlink" href="#example" title="Permalink to this headline"></a></h2>
<blockquote>
<div><div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">asa_im_decode</span>
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