version 1.1.0 2023-11-15 - Updated to IM version 1.21.0.0 - Replaced apparent_visual_magnitude attribute with an Apparent_Magnitude class that can specify filter. - Added telescope_tracking_rate attribute to Instrument_Parameters to record Sidereal/Non-Sidereal tracking. - Promoted horizontal/vertical_coordinate_pixel attributes from World_Axis class to Reference_Frame_Parameters class. - Added specified_unit_id to attributes with minimum and maximum values (degrees for angles). - Removed redundant maximum length of 255 from attributes with ASCII_Short_String_Collapsed data type. - Changed attributes with a minimum of 0 or 1 to ASCII_NonNegative_Integer. - Removed unworkable schematron that required coordinate_system_equinox to be nil when Reference_Frame_Identification/name is either ICRS or GAPPT. - Added schematron rule to prohibit coordinate_system_equinox when Reference_Frame_Identification/name is either ICRS or GAPPT and another that requires coordinate_system_equinox when that's not the case. - coordinate_system_equinox is now nillable. Representation of the non-linear geometric distortion -- inverse polynomial order of the first pixel axis. Representation of the non-linear geometric distortion -- polynomial order of the first world axis. This class describes parameters relevant to the airmass during observations. The Apparent_Magnitude class is an optional, repeatable class for recording magnitude measurements made for an observation. Representation of the non-linear geometric distortion -- inverse polynomial order of the second pixel axis. Representation of the non-linear geometric distortion -- polynomial order of the second world axis. Container class for the elements of a linear transformation matrix between the world coordinate frame and the pixel coordinate frame. This class contains attributes for the axis, parameter, and value of an element in a PV distortion matrix. This class is intended to provide additional metadata for earth-based telescopic observations. Much of the information is geometry information, but in an earth-based context. This class contains instrument settings and statuses relevant to the observation. This class details the quality of the product based on observational conditions. This class contains elements of a distortion matrix. Class containing attributes that link the value of ebt:pixel_axis_index with the horizontal and vertical axes of an image. The Reference_Frame_Identification class is a base class for identifying reference frames. These are frames in the NAIF sense, i.e., three orthogonal axes with a specified orientation, but without a fixed origin. This class contains reference terms that define the WCS axes used in an image. This class contains subclasses representing the distortion terms used in the SIP standard. Class containing the value of an element of a SIP distortion polynomial, with element_value corresponding to the actual coefficient. This class describes parameters relevant to the seeing during observations. This class contains attributes that describe angles and points in reference to the target. The Geometry_Telescope class is a container for geometric information relevant to ground-based observations, as well as observations made from Earth-orbiting telescopes. Class containing the value of an element of a linear transformational matrix between the world_axis_index and pixel_axis_index. This class describes parameters relevant to the weather during observations. This class contains attributes that describe an individual world axis as used in an image. This class contains World Coordinate System (WCS) terms as specified by the FITS standard for the purpose of mapping the pixel coordinate frame of an image onto a celestial frame. This section contains the simpleTypes that provide more constraints than those at the base data type level. The simpleTypes defined here build on the base data types. This is another component of the common dictionary and therefore falls within the common namespace. Amount of air along the line of sight when observing a celestial target. Equivalent to one divided by the cosine of the zenith angle (in degrees). The airmass_time attribute specifies the time at which the airmass was measured. The clouds attribute specifies the measured percentage of clouds present during the observation. The humidity attribute specifies the measured outside humidity during the observation, given as a percentage. The ambient_pressure attribute specifies the measured outside pressure during the observation. The ambient_temperature attribute specifies the measured outside temperature during the observation. Positive integer identifying which World_Axis is being described. Name of the celestial coordinate to which this axis corresponds. Latitude in the native coordinate system of the system's celestial pole. Longitude in the native coordinate system of the system's celestial pole. Time origin of the coordinate system. Name of the coordinate system projection used for this axis. The value of the matrix element corresponding to a given set of indices. The frame_spice_name attribute is a NAIF-recognized string identifier for a reference frame associated with the data. The ebt:pixel_axis_index corresponding to the horizontal axis of an image. horizontal_coordinate_pixel (sample) is the horizontal coordinate of a specific pixel. The instrument_temperature attribute specifies the measured temperature of the instrument. The filter in use (r', v', clear, etc.) at the time of the magnitude estimation. The estimated magnitude at the time of observation. The name attribute provides a word or combination of words by which some feature is known. The observing_notes attribute is an optional field for describing the quality of the given observations. Integer value representing the degree of the polynomial term in a SIP distortion polynomial, the p in, f.e. A_p_q. Integer between 0 and 99 corresponding to a particular non-linear algorithm used in a PV Distortion Matrix. The photometric attribute specifies whether observations at the time were considered photometric by the observer. An axis of the pixel coordinate frame used for an image, corresponding to the 'j' in the CDi_j formalism. Integer between 2 and 9 corresponding to the order of distortion polynomial in an image using the SIP standard. Integer value representing the degree of the polynomial term in a SIP distortion polynomial, the q in, f.e. A_p_q. This attribute specifies the FWHM of the seeing disk (e.g. a star). The solar_phase_angle attribute provides a measure of the relationship between the instrument viewing position and the sun. Solar phase angle is measured at the target; it is the angle between a vector to the sun and a vector to the instrument. The subobserver_latitude attribute gives the value of the planetocentric latitude at the subobserver point on the target. The subobserver_longitude attribute gives the value of the planetocentric longitude at the subobserver point on the target. The subsolar_latitude attribute gives the value of the planetocentric latitude at the subsolar point on the target. The subsolar_longitude attribute gives the value of the planetocentric longitude at the subsolar point on the target. The telescope_tracking_rate attribute identifies whether the telescope used for the observation was configured for sidereal tracking, object tracking, or some other tracking rate. The ebt:pixel_axis_index corresponding to the vertical axis of an image. vertical_coordinate_pixel (line) is the vertical coordinate of a specific pixel. A positive integer recording the number of WCS axes used in an image. The weather_notes attribute is an optional field for describing the weather during the observation. An axis of the world coordinate system used for an image, corresponding to the 'i' in the CDi_j formalism. World coordinate value at the reference point for this axis.