Catalog Classes

The C++ interface library consists of a collection of classes that interface to the catalog and image servers or manipulate the local catalog files. The main class is called AstroCatalog(3) . This class provides access to catalogs and image servers. There is also the AstroQuery(3) class, representing queries and the QueryResult(3) class for representing query results. Local catalogs are implemented by a subclass of AstroCatalog called LocalCatalog(3) . There is also a set of special purpose classes for dealing with TCS (Telescope Control Software) catalogs ( TcsCatalog(3) , TcsCatalogObject(3) , TcsQueryResult(3) ). These are catalogs with fixed columns. The following table lists the main C++ classes and their uses:

Class	Description
`AstroCatalog`	Implements basic remote HTTP catalog and image server access.
`AstroImage`	Used to access remote image servers to fetch images given coordinates. (Obsolete, use `AstroCatalog` for this now) .
`LocalCatalog`	Subclass of `AstroCatalog` , implements local catalogs (see also class `QueryResult` ).
`TcsCatalog`	Subclass of `AstroCatalog` , used for TCS catalogs, which have fixed columns.
`TabTable`	This generic class is used to manage tab tables in memory.
`QueryResult`	Subclass of `TabTable` , used to represent the results of a catalog query or a list of rows to be inserted in or deleted from a local catalog.
`TcsQueryResult`	Subclass of `QueryResult` specialized in TCS style catalogs.
`AstroQuery`	Object used to represent a query (position, radius, magnitude range, etc.).
`CatalogInfo`	Class representing the contents of the catalog configuration files, contains a hierarchical list of catalog entries.
`CatalogInfoEntry`	This class represents an entry in a catalog configuration file.
`TcsCatalogObject`	Represents one row or object in a TCS style catalog.
`TclAstroCat`	Implements the `astrocat` Tcl command (Tcl interface to catalogs).
`TclAstroImage`	Implements the `astroimage` Tcl command (Tcl interface to image servers). (Obsolete, use `TclAstroCat` for this now).
`TclTcsCat`	Tcl access to TCS catalogs.

See the man pages in the Reference section for details on the classes listed above.