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stac-extensions / timeseries

Time Series STAC Extension Specification
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Relation to Data Cube extension? #1

Open m-mohr opened 2 years ago

m-mohr commented 2 years ago

This looks very similar of what you can already do with the Data Cube extension. Here you'd likely have at least a temporal dimension in cube:dimensions with values (ts:dates) or extent and step (ts:period). ts:parameters sounds like cube:variables. What's the relation between them? Has it been considered and/or aligned? Reading WCS and Coverages at the bottom sounds like there might be a connection.

emmanuelmathot commented 2 years ago

Hi @m-mohr. Indeed, the temporal dimension is a common aspect of the 2 extensions. I must admit I overlooked the datacube one since it is very specific to the multidimensional arrays of values. In our use case, we simply need to describe a temporal dimension. The affected datasets may be simple CSV files or complex displacement rasters that are combined with other extension such as insar. The relationship with the OGC coverage concept is still very embryonic and would require a deeper work to make something more consistent. I would be glad to find a way to reuse the work done in datacube. I am just a bit confused to use datacube concept for simple time series datasets. What's your view on that?

m-mohr commented 2 years ago

It could probably be used to expose a 1D "data cube", but it doesn't feel natural, indeed. I also did not want to enforce the data cube extension to be used, this was more a heads up. Let's discuss in the STAC meeting or so :-)