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add prerequistes to mosaic configurations
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articles/planetary-computer/mosaic-configurations-for-collections.md

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Within each GeoCatalog STAC (SpatioTemporal Asset Catalog) collection, a **mosaic** specifies the search criteria used to retrieve and visualize STAC items within the Explorer web interface. For example, a mosaic might be configured to only return items that are from a specified date range or items that have less than a particular percentage cloud cover. One or more mosaics are created and managed by the user by editing the mosaic configuraiton for within each STAC collection.
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## Prerequisites
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Before you can configure a mosaic, ensure the following prerequisite steps are complete:
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1. **STAC Collection Exists:** You created a [STAC collection in Planetary Computer Pro](./create-stac-collection.md).
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2. **Data Ingested:** You [added STAC items](./add-stac-item-to-collection.md) containing the geospatial data assets you want to visualize into the collection.
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## Components in a Mosaic
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A STAC collection's mosaic configuration objects is a list of individual specific search criteria, each called a mosaic. Each individual mosaic includes:

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