Hi lists,<br>I have another question about VerticalExtent.<br>As already stated in my previous email titled "Multidimensional Coverage and Vertical Extent", part of my job is related to handling the Extent of a 4D Coverage (XY+Vertical+Temporal). In such a context, ISO 19115 defines the EX_Extent element which is extended by GeographicBoundingBox (holding northing,southing,westing,easting geographic boundaries), TemporalExtent and VerticalExtent. The latter is related to a VerticalCRS (as defined in 19111) which can't be used to handle ellipsoidal height since this height only lives within a 3D GeographicCRS.<br>
Under these conditions, how should I handle the 3rd component of a GeographicCRS to follow the 19115/19111?<br>I just have acquired the 19115:2003 corrigendum 2006 which, for VerticalExtent, has removed the verticalDatum element changed to verticalCRS. Consequently SC_VerticalDatum class has been changed to SC_CRS with the note "SC_CRS: set of parameters describing the relation of gravity-related heights to the Earth".<br>
Now I'm not sure about the meaning of that SC_CRS. It is referring to a general CRS containing a "height related" component (Such as a 3D GeographicCRS or a CompoundCRS)?. Or the SC_CRS has been used to indicate the base class of a VerticalCRS to point out that the Datum class is no more needed)?<br>
Maybe the ISO 19115 VerticalExtent could be related to a more general CoordinateReferenceSystem within it lives instead of a VerticalCRS.<br><br>Best Regards,<br>Daniele<br clear="all"><br>-- <br>-------------------------------------------------------<br>
Eng. Daniele Romagnoli <br>Software Engineer<br><br>GeoSolutions S.A.S.<br>Via Carignoni 51<br>55041 Camaiore (LU)<br>Italy<br><br>phone: +39 0584983027<br>fax: +39 0584983027<br>mob: +39 328 0559267<br><br><br><a href="http://www.geo-solutions.it">http://www.geo-solutions.it</a><br>
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