Datasets are available via AstroGrid in several ways:

• Data Discovery services: AstroScope and HelioScope
• ADQL queries launched from Task Launcher or from a Workflow
  
• Tools developed for specific datasets

Data Discovery Services

AstroScope and HelioScope give access to a large number of datasets from a variety of archives all around the world. They are data discovery services that only support simple queries: AstroScope allows you to search by position in the sky or object name, HelioScope by time range. The best way to find out which data you can retrieve from these services is to try a search.

Datasets available via ADQL queries

On this page we list a selection of the datasets that are available via AstroGrid using the second method mentioned: ADQL queries. ADQL (the "astronomers' data query language", which uses logic similar to the Structured Query Languages used for databases) allows you to construct more complex queries with more complex constrains than simple position or time ranges. To construct queries to the services listed below you need to use the Task Launcher (from the Workbench) or see  Querying databases   via the 2008 VO DeskTop.