Reference to a point location.<br /></p><p><br /></p><p>This may be the baseclass for many different types of location referencing mechanisms such as:<br /></p><p>- Linear referencing<br /></p><p>- AGORA-C referencing<br /></p><p>- Alert-C referencing<br /></p><p><br /></p><p>The subject is further specified in standards and specifications such as:<br /></p><p>- ISO 19133<br /></p><p>- ISO 17572 (parts 1, 2 and 3)<br /></p><p>- EuroRoadS<br /></p><p>- eMotion<br /></p><p><br /></p><p>The subject of linear referencing is also currently being standardised in ISO 19148. <br /></p>