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<a accesskey="3" href="page.php?w=linear_referencing&amp;p=2">3.Next</a>
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<p><b>Linear referencing</b>, also called <b>linear reference system</b> or <b>linear referencing system</b> (<b>LRS</b>), is a method of <a href="page.php?w=spatial_referencing">spatial referencing</a> over linear or curvilinear elements, such as roads or rivers. In LRS, the locations of physical features are described <a href="page.php?w=Parametric_curve">parametrically</a> in terms of a single <a href="page.php?w=curvilinear_coordinate">curvilinear coordinate</a>, typically the distance traveled from a fixed point, such as a <a href="page.php?w=milestone">milestone</a>.</p><p>
<a accesskey="3" href="page.php?w=linear_referencing&amp;p=2">3.Next</a>
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