[Geotools-devel] [Java-collab] Multidimensional coverage and vertical extent

[Daniele Romagnoli]

Hi Martin,

On Fri, May 30, 2008 at 1:14 PM, Martin Desruisseaux <
martin.desruisseaux at geomatys.fr> wrote:

> Daniele Romagnoli a écrit :
> > How can I handle this special vertical level? (Since, I need to define
> > a Vertical CRS... which vertical datum?)
>
> For stuff like "depth in meters below sea level" and "isobaric level",
> there is
> existing VerticalDatumType that can be used for creating VerticalDatum
> instances:
>
>
> http://geoapi.sourceforge.net/snapshot/javadoc/org/opengis/referencing/datum/VerticalDatumType.html#DEPTH


Yes, I noticed that. But in these specials GRIB records there is no
knowledge about an "offset" from a reference level.


>
> <http://geoapi.sourceforge.net/snapshot/javadoc/org/opengis/referencing/datum/VerticalDatumType.html#DEPTH>
>
> For heights relative to cloud level, an application needs to defines new
> VerticalDatumType using the static valueOf(String) method.
>
>
>
> > In the case of a level such as "Cloud Top Level" or "Cloud Base Level"
> > is there a special way to define "its position with respect to the
> > Earth"?
>
> Not at this time. ISO 19111 do not suggests any programmatic way, only
> textual
> way, probably because the relationship is often quite complex. For example
> defining the position of VerticalDatumType.GEOIDAL with respect to
> VerticalDatumType.ELLIPSOIDAL is the subject of a whole GeoTools module on
> its
> own: modules/unsupported/referencing3D.


Yeah, I looked at this on the nice VerticalTransform class + its subclass :)


>
>
> GeoTools referencing module lacks a way to plugin vertical transformations
> at
> this time.
>
>        Martin


Daniele

>
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