urn:nasa:pds:cassini_iss_cruise:data_raw:body-geometry 1.0 1.11.0.0 Product_Metadata_Supplemental M. R. Showalter, R. S. French, M. W. Evans, M. K. Gordon, and M. S. Tiscareno 2020 metadata This table describes the intercept geometry for bodies within the field of view of Cassini ISS images. 2019-08-01 1.0 Initial delivery body-geometry.tab 2019-07-30T21:05:49 65378720 135080 571fdebe49df8ba36955e7e294f9b639 This table describes the intercept geometry for bodies within the field of view of Cassini ISS images. 0 135080 This index describes planet and moon intercept geometry within the field of view of Cassini ISS images. The table contains one row for each body identified within each image obtained during the Cassini cruise (prior to January 1, 2004). Occasionally, SPICE pointing information is unavailable for the time at which an image was exposed. When this situation occurs, no row has been added to the file. Most of this geometry information has been constructed by uniformly sampling the pixels that comprise each image. Pixels have been sampled on an 8x8 grid, i.e., every 64th pixel. To accommodate pointing uncertainty, the image boundary was expanded on every side by a distance equivalent to 25 narrow-angle pixels. For each sampled pixel, a variety of geometric quantitities have been calculated, and the minimum and maximum values of each quantity have been tabulated. Note that, for angular quantities that cycle from 360 degrees to zero, the tabulated minimum can be numerically greater than the maximum. If the planet does not fall within the field of view, values of the NULL_CONSTANT appear in the table. Regions of each body that are obscured by the planet or a targeted moon are excluded from the tabulation. The dark side of each body is also generally excluded. If a body is too small to have been captured in an 8x8 sampling of the image, then the associated NULL_CONSTANT will appear in each column. Note that the last nine columns of the table contain quantities that are independent of the field of view. These quantities are tabulated as single values rather than as minimum/maximum pairs. Additional Note: This file was generated by merging and sorting the contents of three metadata files available from the PDS Ring-Moon Systems Node: COISS_1999_jupiter_summary.tab COISS_1999_saturn_summary.tab COISS_1999_moon_summary.tab These files are available from the Node at this URL: https://pds-rings.seti.org/viewmaster/metadata/COISS_1xxx/COISS_1999 They were downloaded on July 30, 2019. Two additional, leading columns, containing the image LID and PDS4 raw image file path, have been pre-pended to each record; the remainder of each record is unchanged. Carriage-Return Line-Feed 37 0 484 Image LID 1 1 ASCII_LID 52 The LID for this image. File Specification 2 54 ASCII_File_Specification_Name 26 The directory path to the associated raw image file. VOLUME_ID 3 82 ASCII_String 10 The volume ID provides a unique identifier for a PDS data volume. FILE_SPECIFICATION_NAME 4 95 ASCII_String 45 The file specification name provides the full name of a file, including a path name, relative to the root directory of the PDS volume. OPUS_ID 5 143 ASCII_String 25 The OPUS ID uniquely identifies a single experiment or observation (image, occultation profile, spectrum, etc.) within a data set. This is the common tag by which data are identified within the RMS Node catalog, OPUS. TARGET_NAME 6 171 ASCII_String 10 The target name is the name of the body for which the surface geometry parameters in this row of the table are applicable. MINIMUM_PLANETOCENTRIC_LATITUDE 7 183 ASCII_Real 8 deg Planetocentric latitude is the latitude at the surface intercept point on the planet or a specified target body. The planetocentric value is defined by the angle from the body's equator plane to a line defined by a vector from the body center to the body intercept point. Values are positive in the body's northern hemisphere and negative in the southern hemisphere. Note that, for a given surface intercept point on a non-spherical body, the planetocentric latitude is smaller in magnitude than the planetographic latitude. The surface has been modeled as an ellipsoid. Surface intercept points that are obscured by the planet or another moon within the observed field of view are ignored. For observations capturing reflected sunlight (i.e., with wavelengths in the visual or near-infrared), the night side of the target body is also ignored. This column tabulates the minimum value of planetocentric latitude within the field of view of the observation. -999. 90. -90. MAXIMUM_PLANETOCENTRIC_LATITUDE 8 192 ASCII_Real 8 deg Planetocentric latitude is the latitude at the surface intercept point on the planet or a specified target body. The planetocentric value is defined by the angle from the body's equator plane to a line defined by a vector from the body center to the body intercept point. Values are positive in the body's northern hemisphere and negative in the southern hemisphere. Note that, for a given surface intercept point on a non-spherical body, the planetocentric latitude is smaller in magnitude than the planetographic latitude. The surface has been modeled as an ellipsoid. Surface intercept points that are obscured by the planet or another moon within the observed field of view are ignored. For observations capturing reflected sunlight (i.e., with wavelengths in the visual or near-infrared), the night side of the target body is also ignored. This column tabulates the maximum value of planetocentric latitude within the field of view of the observation. -999. 90. -90. MINIMUM_PLANETOGRAPHIC_LATITUDE 9 201 ASCII_Real 8 deg Planetographic latitude is the latitude at the surface intercept point on the planet or a specified target body. The planetographic value is defined by the angle between the body's equator plane and the local surface normal at the body intercept point. Values are positive in the body's northern hemisphere and negative in the southern hemisphere. Note that, for a given surface intercept point on a non-spherical body, the planetographic latitude is larger in magnitude than the planetocentric latitude. The surface has been modeled as an ellipsoid. Surface intercept points that are obscured by the planet or another moon within the observed field of view are ignored. For observations capturing reflected sunlight (i.e., with wavelengths in the visual or near-infrared), the night side of the target body is also ignored. This column tabulates the minimum value of planetographic latitude within the field of view of the observation. -999. 90. -90. MAXIMUM_PLANETOGRAPHIC_LATITUDE 10 210 ASCII_Real 8 deg Planetographic latitude is the latitude at the surface intercept point on the planet or a specified target body. The planetographic value is defined by the angle between the body's equator plane and the local surface normal at the body intercept point. Values are positive in the body's northern hemisphere and negative in the southern hemisphere. Note that, for a given surface intercept point on a non-spherical body, the planetographic latitude is larger in magnitude than the planetocentric latitude. The surface has been modeled as an ellipsoid. Surface intercept points that are obscured by the planet or another moon within the observed field of view are ignored. For observations capturing reflected sunlight (i.e., with wavelengths in the visual or near-infrared), the night side of the target body is also ignored. This column tabulates the maximum value of planetographic latitude within the field of view of the observation. -999. 90. -90. MINIMUM_IAU_LONGITUDE 11 219 ASCII_Real 8 deg IAU longitude is the longitude at the surface intercept point on the planet or a specified target body. Longitudes increase toward the west, in the rotating coordinate frame defined by the IAU. The surface has been modeled as an ellipsoid. Surface intercept points that are obscured by the planet or another moon within the observed field of view are ignored. For observations capturing reflected sunlight (i.e., with wavelengths in the visual or near-infrared), the night side of the target body is also ignored. This column tabulates the minimum value of IAU longitude within the field of view of the observation. For fields of view that cross the prime meridian, the tabulated minimum value will be greater than the maximum. -999. 360. 0. MAXIMUM_IAU_LONGITUDE 12 228 ASCII_Real 8 deg IAU longitude is the longitude at the surface intercept point on the planet or a specified target body. Longitudes increase toward the west, in the rotating coordinate frame defined by the IAU. The surface has been modeled as an ellipsoid. Surface intercept points that are obscured by the planet or another moon within the observed field of view are ignored. For observations capturing reflected sunlight (i.e., with wavelengths in the visual or near-infrared), the night side of the target body is also ignored. This column tabulates the maximum value of IAU longitude within the field of view of the observation. For fields of view that cross the prime meridian, the tabulated minimum value will be greater than the maximum. -999. 360. 0. MINIMUM_LOCAL_HOUR_ANGLE 13 237 ASCII_Real 8 deg Local hour angle is a measure of the local solar time as observed at the surface intercept point on the planet or a specified target body. The value is 180 degrees at a point on the surface as the Sun is crossing the local meridian. Local hour angle can alternatively be understood as a longitude frame that originates at the anti-solar direction and increases toward the east (assuming prograde rotation). The surface has been modeled as an ellipsoid. Surface intercept points that are obscured by the planet or another moon within the observed field of view are ignored. The night side of the target body is not ignored. This column tabulates the minimum value of local hour angle within the field of view of the observation. For fields of view that cross the midnight meridian, the tabulated minimum value will be greater than the maximum. -999. 360. 0. MAXIMUM_LOCAL_HOUR_ANGLE 14 246 ASCII_Real 8 deg Local hour angle is a measure of the local solar time as observed at the surface intercept point on the planet or a specified target body. The value is 180 degrees at a point on the surface as the Sun is crossing the local meridian. Local hour angle can alternatively be understood as a longitude frame that originates at the anti-solar direction and increases toward the east (assuming prograde rotation). The surface has been modeled as an ellipsoid. Surface intercept points that are obscured by the planet or another moon within the observed field of view are ignored. The night side of the target body is not ignored. This column tabulates the maximum value of local hour angle within the field of view of the observation. For fields of view that cross the midnight meridian, the tabulated minimum value will be greater than the maximum. -999. 360. 0. MINIMUM_LONGITUDE_WRT_OBSERVER 15 255 ASCII_Real 8 deg This alternative definition of longitude is measured relative to the direction toward the observer. Values increase westward. Unlike other longitudes, this quantity ranges from -180 to 180 degrees instead of 0 to 360 degrees. The surface has been modeled as an ellipsoid. Surface intercept points that are obscured by the planet or another moon within the observed field of view are ignored. For observations capturing reflected sunlight (i.e., with wavelengths in the visual or near-infrared), the night side of the target body is also ignored. This column tabulates the minimum value of this longitude within the field of view of the observation. -999. 180. -180. MAXIMUM_LONGITUDE_WRT_OBSERVER 16 264 ASCII_Real 8 deg This alternative definition of longitude is measured relative to the direction toward the observer. Values increase westward. Unlike other longitudes, this quantity ranges from -180 to 180 degrees instead of 0 to 360 degrees. The surface has been modeled as an ellipsoid. Surface intercept points that are obscured by the planet or another moon within the observed field of view are ignored. For observations capturing reflected sunlight (i.e., with wavelengths in the visual or near-infrared), the night side of the target body is also ignored. This column tabulates the maximum value of this longitude within the field of view of the observation. -999. 180. -180. MINIMUM_FINEST_SURFACE_RESOLUTION 17 273 ASCII_Real 10 km Finest surface resolution is the shorter dimension of a pixel as projected onto the surface at the intercept point. In practice, it defines the approximate size of the smallest linear feature that can be resolved if that feature is oriented optimally on the surface. The surface has been modeled as an ellipsoid. Surface intercept points that are obscured by the planet or another moon within the observed field of view are ignored. For observations capturing reflected sunlight (i.e., with wavelengths in the visual or near-infrared), the night side of the target body is also ignored. This column tabulates the minimum value of finest surface resolution within the field of view of the observation. In other words, this is the size of the smallest resolvable feature in the field of view. -999. MAXIMUM_FINEST_SURFACE_RESOLUTION 18 284 ASCII_Real 10 km Finest surface resolution is the shorter dimension of a pixel as projected onto the surface at the intercept point. In practice, it defines the approximate size of the smallest linear feature that can be resolved if that feature is oriented optimally on the surface. The surface has been modeled as an ellipsoid. Surface intercept points that are obscured by the planet or another moon within the observed field of view are ignored. For observations capturing reflected sunlight (i.e., with wavelengths in the visual or near-infrared), the night side of the target body is also ignored. This column tabulates the maximum value of finest surface resolution within the field of view of the observation. In other words, this is the smallest resolvable feature that could be resolved anywhere in the field of view provided that feature is oriented optimally on the surface. -999. MINIMUM_COARSEST_SURFACE_RESOLUTION 19 295 ASCII_Real 10 km Coarsest surface resolution is the longer dimension of a pixel as projected onto the surface at the intercept point. At any given intercept point, the coarsest surface resolution is typically larger than the finest resolution by a factor of 1/cos(emission angle). In practice, this defines the approximate size of a linear feature that can be resolved if that feature has its worst possible orientation on the surface. The surface has been modeled as an ellipsoid. Surface intercept points that are obscured by the planet or another moon within the observed field of view are ignored. For observations capturing reflected sunlight (i.e., with wavelengths in the visual or near-infrared), the night side of the target body is also ignored. This column tabulates the minimum value of coarsest surface resolution within the field of view of the observation. In other words, this is the size of the smallest feature that could be be resolved somewhere within the field of view, even if its orientation on the surface is the worst it can be. -999. MAXIMUM_COARSEST_SURFACE_RESOLUTION 20 306 ASCII_Real 10 km Coarsest surface resolution is the longer dimension of a pixel as projected onto the surface at the intercept point. At any given intercept point, the coarsest surface resolution is typically larger than the finest resolution by a factor of 1/cos(emission angle). In practice, this defines the approximate size of a linear feature that can be resolved if that feature has its worst possible orientation on the surface. The surface has been modeled as an ellipsoid. Surface intercept points that are obscured by the planet or another moon within the observed field of view are ignored. For observations capturing reflected sunlight (i.e., with wavelengths in the visual or near-infrared), the night side of the target body is also ignored. This column tabulates the maximum value of coarsest surface resolution within the field of view of the observation. In other words, this is the size of the smallest feature that could be be resolved anywhere in the field of view and regardless of its orientation on the surface. -999. MINIMUM_SURFACE_DISTANCE 21 317 ASCII_Real 12 km Surface distance is the separation between the observer and the point where a line of sight intercepts the surface of the planet or a specified target body. The surface has been modeled as an ellipsoid. Surface intercept points that are obscured by the planet or another moon within the observed field of view are ignored. For observations capturing reflected sunlight (i.e., with wavelengths in the visual or near-infrared), the night side of the target body is also ignored. This column tabulates the minimum value of surface distance within the field of view of the observation. -999. MAXIMUM_SURFACE_DISTANCE 22 330 ASCII_Real 12 km Surface distance is the separation between the observer and the point where a line of sight intercepts the surface of the planet or a specified target body. The surface has been modeled as an ellipsoid. Surface intercept points that are obscured by the planet or another moon within the observed field of view are ignored. For observations capturing reflected sunlight (i.e., with wavelengths in the visual or near-infrared), the night side of the target body is also ignored. This column tabulates the maximum value of surface distance within the field of view of the observation. -999. MINIMUM_PHASE_ANGLE 23 343 ASCII_Real 8 deg Phase angle is the angle, measured at the surface intercept point, between the direction of the incoming photon from the Sun and the direction of the outgoing photon to the observer. The surface has been modeled as an ellipsoid. Surface intercept points that are obscured by the planet or another moon within the observed field of view are ignored. The night side of the target body is not ignored. This column tabulates the minimum value of phase angle within the field of view of the observation. -999. 180. 0. MAXIMUM_PHASE_ANGLE 24 352 ASCII_Real 8 deg Phase angle is the angle, measured at the surface intercept point, between the direction of the incoming photon from the Sun and the direction of the outgoing photon to the observer. The surface has been modeled as an ellipsoid. Surface intercept points that are obscured by the planet or another moon within the observed field of view are ignored. The night side of the target body is not ignored. This column tabulates the maximum value of phase angle within the field of view of the observation. -999. 180. 0. MINIMUM_INCIDENCE_ANGLE 25 361 ASCII_Real 8 deg Incidence angle is the angle, measured at the surface intercept point, between the local surface normal vector and the direction of the incoming photon from the Sun. The surface has been modeled as an ellipsoid. Surface intercept points that are obscured by the planet or another moon within the observed field of view are ignored. The night side of the target body is not ignored; here the incidence angle is > 90 degrees. This column tabulates the minimum value of incidence angle within the field of view of the observation. -999. 180. 0. MAXIMUM_INCIDENCE_ANGLE 26 370 ASCII_Real 8 deg Incidence angle is the angle, measured at the surface intercept point, between the local surface normal vector and the direction of the incoming photon from the Sun. The surface has been modeled as an ellipsoid. Surface intercept points that are obscured by the planet or another moon within the observed field of view are ignored. The night side of the target body is not ignored; here the incidence angle is > 90 degrees. This column tabulates the maximum value of incidence angle within the field of view of the observation. -999. 180. 0. MINIMUM_EMISSION_ANGLE 27 379 ASCII_Real 8 deg Emission angle is the angle, measured at the surface intercept point, between the local surface normal vector and the direction of the outgoing photon to the observer. The surface has been modeled as an ellipsoid. Surface intercept points that are obscured by the planet or another moon within the observed field of view are ignored. The night side of the target body is not ignored. This column tabulates the minimum value of emission angle within the field of view of the observation. -999. 90. 0. MAXIMUM_EMISSION_ANGLE 28 388 ASCII_Real 8 deg Emission angle is the angle, measured at the surface intercept point, between the local surface normal vector and the direction of the outgoing photon to the observer. The surface has been modeled as an ellipsoid. Surface intercept points that are obscured by the planet or another moon within the observed field of view are ignored. The night side of the target body is not ignored. This column tabulates the maximum value of emission angle within the field of view of the observation. -999. 90. 0. SUB_SOLAR_PLANETOCENTRIC_LATITUDE 29 397 ASCII_Real 8 deg Planetocentric latitude of the sub-solar point on the surface of the planet or specified target body. The planetocentric value is defined by the angle from the body's equator plane to a line defined by a vector from the body center to the sub-solar point. Values are positive in the body's northern hemisphere and negative in the southern hemisphere. This value is defined by the instantaneous geometry at the time of the observation; it is independent of the field of view. -999. 90. -90. SUB_SOLAR_PLANETOGRAPHIC_LATITUDE 30 406 ASCII_Real 8 deg Planetographic latitude of the sub-solar point on the surface of the planet or specified target body. The planetographic value is defined by the angle between the body's equator plane and the local surface normal at the sub-solar point. Values are positive in the body's northern hemisphere and negative in the southern hemisphere. This value is defined by the instantaneous geometry at the time of the observation; it is independent of the field of view. -999. 90. -90. SUB_OBSERVER_PLANETOCENTRIC_LATITUDE 31 415 ASCII_Real 8 deg Planetocentric latitude of the sub-observer point on the surface of the planet or specified target body. The planetocentric value is defined by the angle from the body's equator plane to a line defined by a vector from the body center to the sub-observer point. Values are positive in the body's northern hemisphere and negative in the southern hemisphere. This value is defined by the instantaneous geometry at the time of the observation; it is independent of the field of view. -999. 90. -90. SUB_OBSERVER_PLANETOGRAPHIC_LATITUDE 32 424 ASCII_Real 8 deg Planetographic latitude of the sub-observer point on the surface of the planet or specified target body. The planetographic value is defined by the angle between the body's equator plane and the local surface normal at the sub-observer point. Values are positive in the body's northern hemisphere and negative in the southern hemisphere. This value is defined by the instantaneous geometry at the time of the observation; it is independent of the field of view. -999. 90. -90. SUB_SOLAR_IAU_LONGITUDE 33 433 ASCII_Real 8 deg Longitude of the sub-solar point on the surface of the planet or specified target body. Longitudes increase toward the west from the IAU-defined prime meridian. This value is defined by the instantaneous geometry at the time of the observation; it is independent of the field of view. -999. 360. 0. SUB_OBSERVER_IAU_LONGITUDE 34 442 ASCII_Real 8 deg Longitude of the sub-observer point on the surface of the planet or specified target body. Longitudes increase toward the west from the IAU-defined prime meridian. This value is defined by the instantaneous geometry at the time of the observation; it is independent of the field of view. -999. 360. 0. CENTER_RESOLUTION 35 451 ASCII_Real 10 km The linear size of a pixel as projected at the distance of the planet or specified target body. This value is defined by the instantaneous geometry at the time of the observation; it is independent of the field of view. -999. CENTER_DISTANCE 36 462 ASCII_Real 12 km Distance from the observer to the center of the planet or a specified target body. This value is defined by the instantaneous geometry at the time of the observation; it is independent of the field of view. -999. CENTER_PHASE_ANGLE 37 475 ASCII_Real 8 deg Phase angle at the center of the planet or specified target body. This is the angle between the local direction of in incoming photon from the Sun and the local direction of an outgoing photon to the observer. This value is defined by the instantaneous geometry at the time of the observation; it is independent of the field of view. -999. 180. 0.