| Description: The start_time_doy element provides the time of shutter open. Calculated from spacecraft clock of shutter close less the exposure duration. Expressed in UTC format, and includes subRTI resolution. (A subRTI is approximately 4 msec (1/256 second)). When the shutter was inhibited (ie SHUTTER_STATE_ID=”DISABLED”), the START_TIME = STOP_TIME, and both represent the start of the exposure window during the prepare cycle of the image. This value corresponds to the value for start_date_time given in the Time Coordinates section of the label in the year day-of-year format of the original PDS3 label. |