Implement the Aggregation Extension #245
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jonhealy1
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Jul 14, 2024
**Related Issue(s):** - #245 **Description:** Adds support for The [Aggregation Extension](https://github.com/stac-api-extensions/aggregation) with an added dependency on the Filter Extension. This enables geo-aggregation of geometries and points, taking advantage of Opensearch and Elasticsearch's aggregation engines. Note that some of the geo-aggregation features will have to be left untested on the Elasticsearch backend implementation because they require a commercial license. TO DO: - ~~Need to support collection aggregations using the `<collection ID>/aggregate` route. Add support in the aggregate function in the core aggregations extension.~~ **PR Checklist:** - [x] Code is formatted and linted (run `pre-commit run --all-files`) - [x] Tests pass (run `make test`) - [x] Documentation has been updated to reflect changes, if applicable - [x] Changes are added to the changelog
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Added in #276 |
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Is your feature request related to a problem? Please describe.
Both Elasticsearch and Opensearch have the functionality to aggregate geo_points and geo_shapes into geotiles, geohash, and h3. However the geo-aggregations in Elasticsearch are a commercial license feature. They are freely available in Opensearch.
The STAC API Aggregation Extension can be used to retrieve aggregations of STAC Items based on a search result from Opensearch or Elasticsearch.
Describe the solution you'd like
Create an implementation of the STAC API Aggregation Extension. There is an open PR in stac-fastapi #684 that will add baseline support for the Aggregation extension.
Describe alternatives you've considered
Opensearch does not yet support geo_shape aggregation to h3 hexagons. I wonder if an external STAC API plugin that utilizes STAC geoparquet and DuckDB for h3 aggregation could be useful...
Additional context
The stac-server project has a node-based implementation of Aggregation..
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