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| ## Aggregation | ||
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| Stac-fatsapi-elasticsearch-opensearch supports the STAC API [Aggregation Extension](https://github.com/stac-api-extensions/aggregation). This enables aggregation of points and geometries, as well as frequency distribution aggregation of any other property including dates. Aggregations can be defined at the root Catalog level (`/aggregations`) and at the Collection level (`/<collection_id>/aggregations`). The [Filter Extension](https://github.com/stac-api-extensions/filter) is also fully supported, enabling aggregated returns of search queries. Any query made with `/search` may also be executed with `/aggregate`, provided that the relevant aggregation fields are available, | ||
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| A field named `aggregations` should be added to the Collection object for the collection for which the aggregations are available, for example: | ||
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| Available aggregations are: | ||
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| - total_count (count of total items) | ||
| - collection_frequency (Item `collection` field) | ||
| - platform_frequency (Item.Properties.platform) | ||
| - cloud_cover_frequency (Item.Properties.eo:cloud_cover) | ||
| - datetime_frequency (Item.Properties.datetime, monthly interval) | ||
| - datetime_min (earliest Item.Properties.datetime) | ||
| - datetime_max (latest Item.Properties.datetime) | ||
| - sun_elevation_frequency (Item.Properties.view:sun_elevation) | ||
| - sun_azimuth_frequency (Item.Properties.view:sun_azimuth) | ||
| - off_nadir_frequency (Item.Properties.view:off_nadir) | ||
| - grid_code_frequency (Item.Properties.grid:code) | ||
| - centroid_geohash_grid_frequency ([geohash grid](https://opensearch.org/docs/latest/aggregations/bucket/geohash-grid/) on Item.Properties.proj:centroid) | ||
| - centroid_geohex_grid_frequency ([geohex grid](https://opensearch.org/docs/latest/aggregations/bucket/geohex-grid/) on Item.Properties.proj:centroid) | ||
| - centroid_geotile_grid_frequency (geotile on Item.Properties.proj:centroid) | ||
| - geometry_geohash_grid_frequency ([geohash grid](https://opensearch.org/docs/latest/aggregations/bucket/geohash-grid/) on Item.geometry) | ||
| - geometry_geotile_grid_frequency ([geotile grid](https://opensearch.org/docs/latest/aggregations/bucket/geotile-grid/) on Item.geometry) | ||
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| Support for additional fields and new aggregations can be added in the [OpenSearch database_logic.py](../../stac_fastapi/opensearch/stac_fastapi/opensearch/database_logic.py) and [ElasticSearch database_logic.py](../../stac_fastapi/elasticsearch/stac_fastapi/elasticsearch/database_logic.py) files. | ||
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| ```json | ||
| "aggregations": [ | ||
| { | ||
| "name": "total_count", | ||
| "data_type": "integer" | ||
| }, | ||
| { | ||
| "name": "datetime_max", | ||
| "data_type": "datetime" | ||
| }, | ||
| { | ||
| "name": "datetime_min", | ||
| "data_type": "datetime" | ||
| }, | ||
| { | ||
| "name": "datetime_frequency", | ||
| "data_type": "frequency_distribution", | ||
| "frequency_distribution_data_type": "datetime" | ||
| }, | ||
| { | ||
| "name": "sun_elevation_frequency", | ||
| "data_type": "frequency_distribution", | ||
| "frequency_distribution_data_type": "numeric" | ||
| }, | ||
| { | ||
| "name": "platform_frequency", | ||
| "data_type": "frequency_distribution", | ||
| "frequency_distribution_data_type": "string" | ||
| }, | ||
| { | ||
| "name": "sun_azimuth_frequency", | ||
| "data_type": "frequency_distribution", | ||
| "frequency_distribution_data_type": "numeric" | ||
| }, | ||
| { | ||
| "name": "off_nadir_frequency", | ||
| "data_type": "frequency_distribution", | ||
| "frequency_distribution_data_type": "numeric" | ||
| }, | ||
| { | ||
| "name": "cloud_cover_frequency", | ||
| "data_type": "frequency_distribution", | ||
| "frequency_distribution_data_type": "numeric" | ||
| }, | ||
| { | ||
| "name": "grid_code_frequency", | ||
| "data_type": "frequency_distribution", | ||
| "frequency_distribution_data_type": "string" | ||
| }, | ||
| { | ||
| "name": "centroid_geohash_grid_frequency", | ||
| "data_type": "frequency_distribution", | ||
| "frequency_distribution_data_type": "string" | ||
| }, | ||
| { | ||
| "name": "centroid_geohex_grid_frequency", | ||
| "data_type": "frequency_distribution", | ||
| "frequency_distribution_data_type": "string" | ||
| }, | ||
| { | ||
| "name": "centroid_geotile_grid_frequency", | ||
| "data_type": "frequency_distribution", | ||
| "frequency_distribution_data_type": "string" | ||
| }, | ||
| { | ||
| "name": "geometry_geohash_grid_frequency", | ||
| "data_type": "frequency_distribution", | ||
| "frequency_distribution_data_type": "numeric" | ||
| }, | ||
| { | ||
| "name": "geometry_geotile_grid_frequency", | ||
| "data_type": "frequency_distribution", | ||
| "frequency_distribution_data_type": "string" | ||
| } | ||
| ] | ||
| ``` | ||
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