Talk:2011-06-13: Multiple versions of data

ACP WCS services -- Rhusar 14:27, 13 June 2011 (MDT)

Martin, Here are the items we said we'd point you to - the ACP Viewer and WCSes with satellite derived gaseous columns:

The last WCS is new to me - found it through uFind. Rudy can probably give background.

We look forward to your feedback and follow-on discussions on how well these services and their data meet your needs and any suggestions on how they might be made more useful. Stefan

Re: ACP WCS services -- Rhusar 14:40, 13 June 2011 (MDT)

Stefan, Are you sure CIRA is serving Tropospheric NO2? I only saw two coverages in the Capabilities doc, total column NO2 and total column O3. Chris

Re: Re: ACP WCS services -- Rhusar 14:46, 13 June 2011 (MDT)

Yes, but it's not listed in the GetCapabilities. The DataFed WCS is similar. They are set up as additional dimension fields. We'd need to have Rudy or Kari explain the details. You can see them when they are displayed in the DataFed browser.for example Stefan

Re: Re: Re: ACP WCS services -- Rhusar 14:48, 13 June 2011 (MDT)

This service uses WCS v1.1.2 where multiple fields can be included in one coverage. The following fields are served:
Colum Amount NO2 CS30
Colum Amount NO2 Troposphere CS30
CloudFraction
ColumnAmountO3
Wenli

Re: Re: Re: Re: ACP WCS services -- Rhusar 14:51, 13 June 2011 (MDT)

Wenli, Thanks for pointing out that we use WCS version 1.1.2. We find that Version 1.1 offers a natural mapping for data structures used in air qulaity:
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.
Field >>> maps to >>> Obs or model Parameter, i.e. AOT, ColumnNO2, SurfaceSo4 R

=Re: Re: Re: Re: Re: ACP WCS services -- Rhusar 14:52, 13 June 2011 (MDT)=

Rudy, I agree. I think that the biggest improvement in v1.1 over v1.0 is its enablement of multi-field coverage, which is the common data model used in EO communities (e.g., netCDF and HDF data products). However, this version had not been widely implemented before OGC adopted a newer modular based specification design (and now a newer WCS2.0 spec is produced and is in testing phase). Wenli

Distinguishing OMI data at different servers -- Rhusar 14:57, 13 June 2011 (MDT)

Rudy, How does a WCS client distinguish between the OMI data served from our WCS server and the data served from CIRA? That is, how would a universal client make a decision on which one to use? Or is there no distinction between the two? Chris

Re: Distinguishing OMI data at different servers -- Rhusar 15:00, 13 June 2011 (MDT)

Chris, The two OMI NO2 data versions differ in their Discovery Metadata, specifically having different Distributor....in uFIND. Of course, the service endpoints for the two NO2 data are different:
http://viper.cira.colostate.edu:8080/gsfc&coverage=ColumnAmountNO2&field=NO2Trop
http://data1.datafed.net:8080/ACDISC&coverage=OMNO2&field=NO2Trop
R

Re: Re: Distinguishing OMI data at different servers -- Rhusar 15:01, 13 June 2011 (MDT)

Rudy,That means that we have 3 versions in the wild, not 2, if you include our GES DISC WCS server. Chris