status/design of stac implementation

[pvgenuchten]

I'm curious to learn more about the implementation of stac in pycsw. Maybe some of my questions are more functional on how the implementation is supposed to work.

• From the https://demo.pycsw.org/cite, there is a link to stac api, following that I arrive in https://demo.pycsw.org/cite/search (why search and not stac), however on that endpoint I would expect a listing of collections (metadata.main) which then links to /items which provides the actual listing of stac items

• When i post the /search url in https://radiantearth.github.io/stac-browser, i arrive in a nice catalogue page
  

• However there is no option to continue into any items or assets from the collection endpoint
  

• The problem may be that https://demo.pycsw.org/cite/collections/metadata:main?f=json does not include a link to /items as for example https://paituli.csc.fi/geoserver/ogc/stac/collections/luke_erosion_susceptibility_of_agricultural_areas_at_paituli?f=json has (why is stac browser even querying that endpoint, because it is a ogc-api-records endpoint)

• On the html output of pycsw i'm actually able to drill down into a stac item from the search page https://demo.pycsw.org/cite/stac/collections/metadata:main/items/urn:uuid:e9330592-0932-474b-be34-c3a3bb67c7db

• Notice the /stac/ part in the url. Now when navigating for example to /cite/stac/collections/metadata:main/items or /cite/stac/collections/metadata:main I get a 500 error. Could be ok, since these links are not advertised, but a bit unexpected.

• None of the records advertise assets, although they sure have links to datasets, what is the mechanism to include a dataset-href as an asset (https://docs.pycsw.org/en/latest/stac.html does not mention assets, so maybe this has not been implemented yet?)

• interestingly the ogcapi-records implementation in pygeoapi displays quite nicely in stac browser

A suggestion could be to combine ogcapi-records and stac in a single endpoint, and only in details enable configuration of specific stac or ogcapi-records aspects.

[kalxas]

There is an ongoing plan to improve the compatibility between STAC tooling and pycsw in the next few months.

[tomkralidis]

We will review our STAC support as part of the next release.

[tomkralidis]

@pvgenuchten can you give this another round of testing and provide feedback?

Below is an example based on pycsw master (via https://demo.pycsw.org/gisdata/stac).

Modelling STAC assets is currently not supported (note that if a pycsw metadata repository holds a STAC item with assets, they will be emitted accordingly).