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<h1 id="geographic-queries">Geographic Queries</h1>
<p>Apache Druid (incubating) supports filtering specially spatially indexed columns based on an origin and a bound.</p>
<h1 id="spatial-indexing">Spatial Indexing</h1>
<p>In any of the data specs, there is the option of providing spatial dimensions. For example, for a JSON data spec, spatial dimensions can be specified as follows:</p>
<div class="highlight"><pre><code class="language-json" data-lang="json"><span></span><span class="p">{</span>
<span class="nt">&quot;type&quot;</span><span class="p">:</span> <span class="s2">&quot;hadoop&quot;</span><span class="p">,</span>
<span class="nt">&quot;dataSchema&quot;</span><span class="p">:</span> <span class="p">{</span>
<span class="nt">&quot;dataSource&quot;</span><span class="p">:</span> <span class="s2">&quot;DatasourceName&quot;</span><span class="p">,</span>
<span class="nt">&quot;parser&quot;</span><span class="p">:</span> <span class="p">{</span>
<span class="nt">&quot;type&quot;</span><span class="p">:</span> <span class="s2">&quot;string&quot;</span><span class="p">,</span>
<span class="nt">&quot;parseSpec&quot;</span><span class="p">:</span> <span class="p">{</span>
<span class="nt">&quot;format&quot;</span><span class="p">:</span> <span class="s2">&quot;json&quot;</span><span class="p">,</span>
<span class="nt">&quot;timestampSpec&quot;</span><span class="p">:</span> <span class="p">{</span>
<span class="nt">&quot;column&quot;</span><span class="p">:</span> <span class="s2">&quot;timestamp&quot;</span><span class="p">,</span>
<span class="nt">&quot;format&quot;</span><span class="p">:</span> <span class="s2">&quot;auto&quot;</span>
<span class="p">},</span>
<span class="nt">&quot;dimensionsSpec&quot;</span><span class="p">:</span> <span class="p">{</span>
<span class="nt">&quot;dimensions&quot;</span><span class="p">:</span> <span class="p">[],</span>
<span class="nt">&quot;spatialDimensions&quot;</span><span class="p">:</span> <span class="p">[{</span>
<span class="nt">&quot;dimName&quot;</span><span class="p">:</span> <span class="s2">&quot;coordinates&quot;</span><span class="p">,</span>
<span class="nt">&quot;dims&quot;</span><span class="p">:</span> <span class="p">[</span><span class="s2">&quot;lat&quot;</span><span class="p">,</span> <span class="s2">&quot;long&quot;</span><span class="p">]</span>
<span class="p">}]</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="p">}</span>
</code></pre></div>
<table><thead>
<tr>
<th>property</th>
<th>description</th>
<th>required?</th>
</tr>
</thead><tbody>
<tr>
<td>dimName</td>
<td>The name of the spatial dimension. A spatial dimension may be constructed from multiple other dimensions or it may already exist as part of an event. If a spatial dimension already exists, it must be an array of coordinate values.</td>
<td>yes</td>
</tr>
<tr>
<td>dims</td>
<td>A list of dimension names that comprise a spatial dimension.</td>
<td>no</td>
</tr>
</tbody></table>
<h1 id="spatial-filters">Spatial Filters</h1>
<p>The grammar for a spatial filter is as follows:</p>
<div class="highlight"><pre><code class="language-json" data-lang="json"><span></span><span class="s2">&quot;filter&quot;</span> <span class="err">:</span> <span class="p">{</span>
<span class="nt">&quot;type&quot;</span><span class="p">:</span> <span class="s2">&quot;spatial&quot;</span><span class="p">,</span>
<span class="nt">&quot;dimension&quot;</span><span class="p">:</span> <span class="s2">&quot;spatialDim&quot;</span><span class="p">,</span>
<span class="nt">&quot;bound&quot;</span><span class="p">:</span> <span class="p">{</span>
<span class="nt">&quot;type&quot;</span><span class="p">:</span> <span class="s2">&quot;rectangular&quot;</span><span class="p">,</span>
<span class="nt">&quot;minCoords&quot;</span><span class="p">:</span> <span class="p">[</span><span class="mf">10.0</span><span class="p">,</span> <span class="mf">20.0</span><span class="p">],</span>
<span class="nt">&quot;maxCoords&quot;</span><span class="p">:</span> <span class="p">[</span><span class="mf">30.0</span><span class="p">,</span> <span class="mf">40.0</span><span class="p">]</span>
<span class="p">}</span>
<span class="p">}</span>
</code></pre></div>
<h2 id="bounds">Bounds</h2>
<h3 id="rectangular">Rectangular</h3>
<table><thead>
<tr>
<th>property</th>
<th>description</th>
<th>required?</th>
</tr>
</thead><tbody>
<tr>
<td>minCoords</td>
<td>List of minimum dimension coordinates for coordinates [x, y, z, …]</td>
<td>yes</td>
</tr>
<tr>
<td>maxCoords</td>
<td>List of maximum dimension coordinates for coordinates [x, y, z, …]</td>
<td>yes</td>
</tr>
</tbody></table>
<h3 id="radius">Radius</h3>
<table><thead>
<tr>
<th>property</th>
<th>description</th>
<th>required?</th>
</tr>
</thead><tbody>
<tr>
<td>coords</td>
<td>Origin coordinates in the form [x, y, z, …]</td>
<td>yes</td>
</tr>
<tr>
<td>radius</td>
<td>The float radius value</td>
<td>yes</td>
</tr>
</tbody></table>
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