Introduction to OpenSearch for EO

This plugin adds supporto for the OpenSearch for Earth Observation protocol to GeoServer. References:

The OpenSearch plugin organizes data in “Collections” and “Products”:

  • A collection is a set of products with some uniformity, described by some search attributes and a ISO metadata sheet
  • A product is a set of images (and ancilliary information), describe by some search attributes and a O&M metadata sheet

The system allows the common EO “two level” searches, that is:

  • Firsts lookup for the desired collection of data on the main OSDD document
  • Once the collection is located, a second OSDD providing access to the product search is delivered

If the database contains also the OGC cross links, the Atom search outputs will also contain links allowing a client to jump from the data search to the actual data visualization and exploitation on OGC services.

Search engine storage

The OpenSearch protocol implementation relies on an extension of GeoTools DataAccess called OpenSearchAccess. At the time of writing a single implementation of such interface exists, called JDBCOpenSearchAccess, built and tested to work against a specific PostGIS database schema.

Note

The JDBCOpenSearchAccess is written in general enough terms that other databases should be usable as well, but it’s likely some code improvements will be required to deal with certain databases naming restrictions (e.g., Oracle).

In the future we hope to see other implementations as well, based on storage that might be more suitable for large scale search engine such as SOLR or ElasticSearch.