i><p>What is the area of a polygon (unit<sup>2</sup>)</p></li>
<li><p>How far are two object from one another (unit)</p></li>
</ul></li>
<li><p>Measures come from the GEOS library</p></li>
<li><p>Measures are in the <strong>units</strong> of the base projection</p></li>
<li><p>Measures can be Euclidean or geodesic</p>
<ul>
<li><p>geodesic (Great Circle) distances can be more accurate by eliminating distortion</p></li>
<li><p>but are much slower to calculate</p></li>
</ul></li>
</ul>
</section>
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