Hi Martin,<br><br><div class="gmail_quote">On Fri, May 30, 2008 at 1:14 PM, Martin Desruisseaux <<a href="mailto:martin.desruisseaux@geomatys.fr">martin.desruisseaux@geomatys.fr</a>> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Daniele Romagnoli a écrit :<br>
<div class="Ih2E3d">> How can I handle this special vertical level? (Since, I need to define<br>
> a Vertical CRS... which vertical datum?)<br>
<br>
</div>For stuff like "depth in meters below sea level" and "isobaric level", there is<br>
existing VerticalDatumType that can be used for creating VerticalDatum instances:<br>
<br>
<a href="http://geoapi.sourceforge.net/snapshot/javadoc/org/opengis/referencing/datum/VerticalDatumType.html#DEPTH" target="_blank">http://geoapi.sourceforge.net/snapshot/javadoc/org/opengis/referencing/datum/VerticalDatumType.html#DEPTH</a></blockquote>
<div><br>Yes, I noticed that. But in these specials GRIB records there is no knowledge about an "offset" from a reference level.<br> </div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<a href="http://geoapi.sourceforge.net/snapshot/javadoc/org/opengis/referencing/datum/VerticalDatumType.html#DEPTH" target="_blank"></a><br>
<br>
For heights relative to cloud level, an application needs to defines new<br>
VerticalDatumType using the static valueOf(String) method.<br>
<div class="Ih2E3d"><br>
<br>
<br>
> In the case of a level such as "Cloud Top Level" or "Cloud Base Level"<br>
> is there a special way to define "its position with respect to the<br>
> Earth"?<br>
<br>
</div>Not at this time. ISO 19111 do not suggests any programmatic way, only textual<br>
way, probably because the relationship is often quite complex. For example<br>
defining the position of VerticalDatumType.GEOIDAL with respect to<br>
VerticalDatumType.ELLIPSOIDAL is the subject of a whole GeoTools module on its<br>
own: modules/unsupported/referencing3D.</blockquote><div><br>Yeah, I looked at this on the nice VerticalTransform class + its subclass :)<br> </div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<br>
<br>
GeoTools referencing module lacks a way to plugin vertical transformations at<br>
this time.<br>
<br>
Martin</blockquote><div><br>Daniele <br></div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><br>
<br>
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</blockquote></div><br><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><br>-------------------------------------------------------<br>