[postgis-users] PostGIS Raster: Spec. for WKT and WKB?

[Peter Baumann]

Hi Stefan,

in OGC the Web Coverage Service (WCS) is "in charge" of raster data [1]. 
Coverages are special feature types upon which WCS offers specific 
functionality, like subsetting. These definitions have no resemblance 
with WKT Raster.

A coverage actually is more than only rasters according to ISO 19123 and 
OGC Abstract Topic 6 (which are identical), it can also represent point 
clouds, irregular grids, meshes, and more.
And it is not only 2-D, but can have any spatio-temporal dimension, such 
as 1D time series, 2D imagery, 3D image time series (x/y/t) or geology 
data (x/y/z), 4D climate and ocean data (x/y/z/t).

The latest adopted version of WCS is 2.0 (August 2010). It will be 
uploaded in a week or so, currently you see WCS 1.1.2.

An interactive demo of WCS-based services you find at EarthLook [2]. 
There you also find practical examples of OGC's raster processing 
standard, Web Coverage Processing Service (WCPS), including a sandbox to 
throw in your own queries. All services on said site, from 1D to 4D, are 
based on the open-source rasdaman raster database server [3] running on 
top of PostgreSQL.

Hope that helps,
Peter (WCS group co-chair and spec editor)

[1] www.ogcnetwork.net/wcs
[2] www.earthlook.org
[3] www.rasdaman.org



On 10/13/2010 10:02 AM, Stefan Keller wrote:
> Hi PostGIS users list,
>
> I'm playing around with the PostGIS Raster type with the goal to get
> the principles and to be able to put this exciting new development in
> relation e.g. to standards and other implementations.
>
> I'm aware of WKT and WKB in vector knowing OGC Simple Feature Spec.
> I'm now wondering about the usage of the notion Well Known Text (WKT)
> and Well Known Binary (WKB) for raster.
>
> What I understand from the PostGIS Raster project home page
> (http://trac.osgeo.org/postgis/wiki/WKTRaster) that JPEG and TIFF
> formats are supported.
>
> =>  Do you mean by WKB that these formats are specified in public
> accessible specs.?
> =>  How about the spec. of WKT raster?
>
> -S.
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-- 
Dr. Peter Baumann
  - Professor of Computer Science, Jacobs University Bremen
    www.faculty.jacobs-university.de/pbaumann
    mail: p.baumann at jacobs-university.de
    tel: +49-421-200-3178, fax: +49-421-200-493178
  - Executive Director, rasdaman GmbH Bremen (HRB 147737)
    www.rasdaman.com, mail: baumann at rasdaman.com
    tel: 0800-rasdaman, fax: 0800-rasdafax, mobile: +49-173-5837882
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