View source for WCS 1.0 1.1 2.0 for AQ Network

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This page is for summarizing the discussion and assessment of on the different versions of the OGC WCS protocol. See also the [[Talk:WCS_1.0_1.1_2.0_for_AQ_Network|discussion]] for this page. 

== WCS 1.0 ==
===Background:=== 

===WCS 1.0 features relevant to AQ:=== 
The key features of WCS 1.0 ..are here..

== WCS 1.1.2 ==
===Background:=== 

===WCS 1.1.2 features relevant to AQ:=== 
* CF-netCDF is a strongly typed data structure for multidimensional data cubes
** netCDF gives the storage and data access facility; 
** CF gives it the semantic clarity and specificity.
* WCS 1.1 data access protocol uses a simple parameter-space-time data query language 
** give me the data for specific Obs parameter, 3D Bounding box, time range. 
** The return payload is a slice or dice (sub-cube) subset of the original data along well defined dimensional axes and boundaries.
* CF-netCDF data model and WCS 1.1 data access protocol are structurally compatible
** Observations/Models variables  >> map to CF-netCDF ???
** WCS 1.1 '''Coverage''' >>> maps to >>> '''Dataset''', i.e. a set of homogeneous observations that share space/time dimensions. It may be a specific model, obs network etc.
** WCS 1.1 '''Field''' >>> maps to >>> '''Observation''' or model Parameter, i.e. AOT, ColumnNO2, SurfaceSo4
== WCS 2.0 ==
===Background:===
According to [http://www.opengeospatial.org/standards/wcs OGC],  "This version 2.0 of the Web Coverage Service (WCS) Interface Standard improves (but does not supersede) previous version 1.1.2 [1]. Technical changes from WCS version 1.1.2 include building on the GML 3.2 encoding of coverages, and dividing the standard into this core plus multiple extensions."
 
Ben Dominico points out that [[Talk:WCS_1.0_1.1_2.0_for_AQ_Network#Re:_WCS_1.1.2_WCS_2.0_Difference_--_BDomenico_10:37.2C_15_July_2011_.28MDT.29|the core specification has been officially adopted by the OGC]] , so it is no longer in draft form. On the other hand, this does not mean that the specification is complete because the OGC now uses a core and extensions approach to standards, so there are many extensions underway -- including encoding formats. 
The situation is similar for netCDF. The core specification has been adopted by the OGC along with one [http://www.opengeospatial.org/standards/netcdf extension for the netCDF classic encoding]. Work is underway on a CF conventions extension to the netCDF core as well as an extension to the WCS 2.0 for the CF-netCDF encoding. The next version of the WCS data access protocol has been in preparation for some time.

===WCS 2.0 features relevant to AQ===
The key features of WCS 2.0 are here...add here Weni' PPT.

==AQ CoP Assessment of WCS Versions==
Here we could say stuff like ... Some use 1.0. The Community WCS server uses 1.1.2. Will monitor 2.0 and prepare for it .....Text to be formulated at the workshop?1