| Description: The type of the observation: one of IMAGING, SPECTROSCOPIC, or TIME-SERIES. IMAGING indicates that a 2-D image with two spatial axes was obtained. SPECTROSCOPIC indicates that one of the axes of the data array is related to wavelength. TIME-SERIES indicates that one of the axes is sampling time. For many HST data files, this is the value of FITS keyword OBSTYPE. Where OBSTYPE does not appear, this value depends on other information. - All ACS, NICMOS, WFC3, WFPC, and WFPC2 observations are IMAGING. - All COS, FOS, and GHRS observations are SPECTROSCOPIC. - All HSP observations are TIME-SERIES. - For FOC, the observation_type depends on the value of FITS keyword OPMODE: IMAGING if OPMODE is "ACQ" or "IMAGE"; TIME-SERIES of OPMODE is "OCC"; SPECTROSCOPIC if OPMODE is "SPEC". Note that, for ACS/HRC, the FITS keyword OBSTYPE can have a value of CORONAGRAPHIC. In such cases, the value of this attribute is IMAGING and the coronagraph_flag attribute indicates whether the coronagraph was used. |