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<h1 id="st_simplify">ST_Simplify<a class="headerlink" href="#st_simplify" title="Permanent link">&para;</a></h1>
<p>Introduction: This function simplifies the input geometry by applying the Douglas-Peucker algorithm.</p>
<p><img alt="ST_Simplify" src="../../../../../image/ST_Simplify/ST_Simplify.svg" title="ST_Simplify" /></p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>The simplification may not preserve topology, potentially producing invalid geometries. Use <a href="../ST_SimplifyPreserveTopology/">ST_SimplifyPreserveTopology</a> to retain valid topology after simplification.</p>
</div>
<p>Format: <code>ST_Simplify(geom: Geometry, tolerance: Double)</code></p>
<p>Return type: <code>Geometry</code></p>
<p>Since: <code>v1.7.0</code></p>
<p>SQL Example:</p>
<div class="highlight"><pre><span></span><code><span class="k">SELECT</span><span class="w"> </span><span class="n">ST_Simplify</span><span class="p">(</span><span class="n">ST_Buffer</span><span class="p">(</span><span class="n">ST_GeomFromWKT</span><span class="p">(</span><span class="s1">&#39;POINT (0 2)&#39;</span><span class="p">),</span><span class="w"> </span><span class="mi">10</span><span class="p">),</span><span class="w"> </span><span class="mi">1</span><span class="p">)</span>
</code></pre></div>
<p>Output:</p>
<div class="highlight"><pre><span></span><code>POLYGON ((10 2, 7.0710678118654755 -5.071067811865475, 0.0000000000000006 -8, -7.071067811865475 -5.0710678118654755, -10 1.9999999999999987, -7.071067811865477 9.071067811865476, -0.0000000000000018 12, 7.071067811865474 9.071067811865477, 10 2))
</code></pre></div>
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