# Overview

Chapter overview

This section describes imaging single-dish data.

The data should already be T$_{sys}$ and T$_{sky}$ calibrated (at least into antenna temperature units, $T_A^*$ [K]) , according to the process described in the single-dish calibration pages.

The CASA task used for imaging single-dish data is sdimaging.  This task will return a four-dimensional array with two position axes, one frequency or velocity axis, and one polarization axis. The output of sdimaging is a CASA image that can be explored, analyzed, and manipulated in CASA, or exported into a versatile FITS image format via exportfits.

The pages below first describe the general process of gridding single-dish data followed by the actual procedures invoked with CASA.