Discussion #2598

Format support

Added by Jari Reini over 4 years ago. Updated over 4 years ago.

Status:Feedback
Priority:Normal
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Description

What formats to be included as an output for WCS?

History

#1 Updated by Peter Baumann over 4 years ago

What we found practically relevant:

- GeoTIFF for (referenced(nonreferenced) imagery

- NetCDF for general data (such as 3D x/y/t image timeseries cutouts)

- GML (because of canonical metadata and for 1-D extracts - in future: JSON for the same reasons)

- PNG for browser display of 2D data

But others may or may not share opinions on this slate.

 

#2 Updated by James Passmore over 4 years ago

  • Status changed from New to Feedback

Why do we need to restrict the formats that a WCS can supply, isn't that going to be an implentation decison for any piece of software.  

The formats cited as being required in the data specs is wider than that listed by Peter, so if we are to go for some recommendation of what a WCS implementation should support perhaps we might suggest all GDAL supported formats

#3 Updated by Mikko Visa over 4 years ago

Most weather model data comes as GRIB 1/2 or NetCDF. This is also what we support in our current "wcs-like" download-service. HDF5 in the future perhaps because of raw weather radar data.

#4 Updated by Ilkka Rinne over 4 years ago

I suppose the real issue here is if we can/should mandate each INSPIRE WCS to provide data encoded at least in one general-enough encoding/format. Personally I think it's difficult to mandate that across all INSPIRE WCS services, but it would have to be done in each Data Specification. 

#5 Updated by James Passmore over 4 years ago

One of the aims of a WCS is to provide access to the raw data (rather than some representation of it ~ though this is also allowed), so I think there may be an issue if one format is mandated/expected and that format can't provide all the raw data.  

#6 Updated by Jukka Rahkonen over 4 years ago

Without mandated formats there will be no interoperability and combining data from different member states would be complicated. But is there a requirement to provide all the raw data in INSPIRE, doesn't it deal more with predefined subsets?

#7 Updated by Jukka Rahkonen over 4 years ago

I have been reading

http://inspire.ec.europa.eu/documents/Data_Specifications/INSPIRE_DataSpecification_OI_v3.0.pdf and

http://inspire.ec.europa.eu/documents/Data_Specifications/INSPIRE_DataSpecification_EL_v3.0.pdf

and it seems to me that TIFF/GeoTIFF could be the preferred WCS format for both orthoimages and ElevationGridCoverage. It fulfills the Inspire requirements and all WCS servers can produce it. With LZW compression the file size is not much bigger than with lossless JPEG2000 which is also accepted in the orthophoto specifications, but not for elevation data.

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