<?xml version="1.0" encoding="UTF-8"?> 
<?xml-model href="https://pds.nasa.gov/pds4/pds/v1/PDS4_PDS_1700.sch" schematypens="http://purl.oclc.org/dsdl/schematron"?>
<?xml-model href="https://pds.nasa.gov/pds4/disp/v1/PDS4_DISP_1700.sch" schematypens="http://purl.oclc.org/dsdl/schematron"?>
<?xml-model href="https://pds.nasa.gov/pds4/sp/v1/PDS4_SP_1100.sch" schematypens="http://purl.oclc.org/dsdl/schematron"?>
<?xml-model href="http://pds.nasa.gov/pds4/cart/v1/PDS4_CART_1700.sch" schematypens="http://purl.oclc.org/dsdl/schematron"?>

<Product_Observational xmlns="http://pds.nasa.gov/pds4/pds/v1"
    xmlns:disp="http://pds.nasa.gov/pds4/disp/v1"
    xmlns:sp="http://pds.nasa.gov/pds4/sp/v1"
    xmlns:cart="http://pds.nasa.gov/pds4/cart/v1"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="
    http://pds.nasa.gov/pds4/pds/v1 https://pds.nasa.gov/pds4/pds/v1/PDS4_PDS_1700.xsd
    http://pds.nasa.gov/pds4/disp/v1 https://pds.nasa.gov/pds4/disp/v1/PDS4_DISP_1700.xsd
    http://pds.nasa.gov/pds4/sp/v1 https://pds.nasa.gov/pds4/sp/v1/PDS4_SP_1100.xsd
    http://pds.nasa.gov/pds4/cart/v1 http://pds.nasa.gov/pds4/cart/v1/PDS4_CART_1700.xsd">
    
    <Identification_Area>
        <!-- A product is one multiband image tile. 54 tiles cover the whole planet. -->
        <logical_identifier>urn:nasa:pds:izenberg_pdart14_meap:data_imagecube:virs_cube_64ppd_h13se</logical_identifier>
        <version_id>1.0</version_id>
        <title>VIRS Spectral Cube of Mercury Tile 13SE</title>
        <information_model_version>1.7.0.0</information_model_version>
        <product_class>Product_Observational</product_class>
    </Identification_Area>
    
    <Observation_Area>
        <Time_Coordinates>
            <start_date_time>2004-08-13Z</start_date_time>
            <stop_date_time>2015-04-30Z</stop_date_time>
        </Time_Coordinates>
        <Investigation_Area>
            <name>MESSENGER</name>
            <type>Mission</type>
            <Internal_Reference>
                <lid_reference>urn:nasa:pds:context:investigation:mission.messenger</lid_reference>
                <reference_type>data_to_investigation</reference_type>
            </Internal_Reference>
        </Investigation_Area>
        <Observing_System>
            <name>MESSENGER MASCS</name>
            <Observing_System_Component>
                <name>MESSENGER</name>
                <type>Spacecraft</type>
                <Internal_Reference>
                    <lid_reference>urn:nasa:pds:context:instrument_host:spacecraft.mess</lid_reference>
                    <reference_type>is_instrument_host</reference_type>
                </Internal_Reference>
            </Observing_System_Component>
            <Observing_System_Component>
                <name>MASCS</name>
                <type>Instrument</type>
                <Internal_Reference>
                    <lid_reference>urn:nasa:pds:context:instrument:mascs.mess</lid_reference>
                    <reference_type>is_instrument</reference_type>
                </Internal_Reference>
            </Observing_System_Component>
        </Observing_System>
        <Target_Identification>
            <name>Mercury</name>
            <type>Planet</type>
            <Internal_Reference>
                <lid_reference>urn:nasa:pds:context:target:planet.mercury</lid_reference>
                <reference_type>data_to_target</reference_type>
            </Internal_Reference>
        </Target_Identification>
        
        <Discipline_Area>
        
            <disp:Display_Settings>
                <Local_Internal_Reference>
                    <local_identifier_reference>Spectral_Cube_Object</local_identifier_reference>
                    <local_reference_type>display_settings_to_array</local_reference_type>
                </Local_Internal_Reference>
                <disp:Display_Direction>
                    <disp:horizontal_display_axis>Sample</disp:horizontal_display_axis>
                    <disp:horizontal_display_direction>Left to Right</disp:horizontal_display_direction>
                    <disp:vertical_display_axis>Line</disp:vertical_display_axis>
                    <disp:vertical_display_direction>Top to Bottom</disp:vertical_display_direction>
                </disp:Display_Direction>
            </disp:Display_Settings>

            <sp:Spectral_Characteristics>
                <sp:bin_width_desc>Bin width is a straightforward average of several
                    spectral pixels of VIRS DDR (4 pixels for VIS detector, six for         
                    NIR, resulting in spectral bins about 9.4 nm across for VIS
                    detector, and about 14 nm across for the NIR detector. For the bin
                    width info of each spectral pixel, see the VIRS CDR/DDR/DAP SIS.
                </sp:bin_width_desc>
                <sp:Local_Internal_Reference>
                    <sp:local_identifier_reference>Spectral_Cube_Object</sp:local_identifier_reference>
                    <sp:local_reference_type>spectral_characteristics_to_array_object</sp:local_reference_type>
                </sp:Local_Internal_Reference>
                <sp:Spectral_Lookup>
                    <sp:Local_Internal_Reference>
                        <sp:local_identifier_reference>VIRS_Wavelength_File</sp:local_identifier_reference>
                        <sp:local_reference_type>spectral_characteristics_to_bin_center_values</sp:local_reference_type>
                    </sp:Local_Internal_Reference>
                    <sp:Internal_Reference>
                        <lid_reference>urn:nasa:pds:izenberg_pdart14_meap:imagecube:virs_wavelengths</lid_reference>
                        <reference_type>data_to_ancillary_data</reference_type>
                    </sp:Internal_Reference>
                </sp:Spectral_Lookup>
            </sp:Spectral_Characteristics>
            
            <cart:Cartography>
                <cart:Spatial_Domain>
                    <cart:Bounding_Coordinates>
                        <cart:west_bounding_coordinate unit="deg">135.000000</cart:west_bounding_coordinate>
                        <cart:east_bounding_coordinate unit="deg">-179.987199</cart:east_bounding_coordinate>
                        <cart:north_bounding_coordinate unit="deg">-43.750000</cart:north_bounding_coordinate>
                        <cart:south_bounding_coordinate unit="deg">-65.015625</cart:south_bounding_coordinate>
                    </cart:Bounding_Coordinates>
                </cart:Spatial_Domain>
                <cart:Spatial_Reference_Information>
                    <cart:Horizontal_Coordinate_System_Definition>
                        <cart:Planar>
                            <cart:Map_Projection>
                                <cart:map_projection_name>Equirectangular</cart:map_projection_name>
                                <cart:Equirectangular>
                                    <cart:standard_parallel_1 unit="deg">-43.75</cart:standard_parallel_1>
                                    <cart:longitude_of_central_meridian unit="deg">157.50</cart:longitude_of_central_meridian>
                                    <cart:latitude_of_projection_origin unit="deg">0.0</cart:latitude_of_projection_origin>
                                </cart:Equirectangular>
                            </cart:Map_Projection>
                            <cart:Planar_Coordinate_Information>
                                <cart:planar_coordinate_encoding_method>Coordinate Pair</cart:planar_coordinate_encoding_method>
                                <cart:Coordinate_Representation>
                                    <cart:pixel_resolution_x unit="m/pixel">665.243153</cart:pixel_resolution_x>
                                    <cart:pixel_resolution_y unit="m/pixel">665.243153</cart:pixel_resolution_y>
                                    <cart:pixel_scale_x unit="pixel/deg">64.000000</cart:pixel_scale_x>
                                    <cart:pixel_scale_y unit="pixel/deg">64.000000</cart:pixel_scale_y>
                                </cart:Coordinate_Representation>
                            </cart:Planar_Coordinate_Information>                            
                            <cart:Geo_Transformation>
                                <cart:upperleft_corner_x unit="m">-691988.658511</cart:upperleft_corner_x>
                                <cart:upperleft_corner_y unit="m">-1862680.827575</cart:upperleft_corner_y>
                            </cart:Geo_Transformation>
                        </cart:Planar>
                        <cart:Geodetic_Model>
                            <cart:latitude_type>planetocentric</cart:latitude_type>
                            <cart:spheroid_name>Mercury</cart:spheroid_name>
                            <cart:semi_major_radius unit="km">2439.4</cart:semi_major_radius>
                            <cart:semi_minor_radius unit="km">2439.4</cart:semi_minor_radius>
                            <cart:polar_radius unit="km">2439.4</cart:polar_radius>
                            <cart:longitude_direction>Positive East</cart:longitude_direction>
                        </cart:Geodetic_Model>
                    </cart:Horizontal_Coordinate_System_Definition>
                </cart:Spatial_Reference_Information>
            </cart:Cartography>
            
        </Discipline_Area>
    </Observation_Area>
    
    <File_Area_Observational>
        <File>
            <file_name>virs_cube_64ppd_h13se.img</file_name>
            <creation_date_time>2016-05-04T23:23:18</creation_date_time>
            <file_size unit="byte">1280172932</file_size>
            <comment>VIRS Image Cube Tile 13SE in standard PDS4 IMG format.
                     The image cube has 105 spectral bands and 8 backplanes.</comment>
        </File>
        
        <!-- Image Cube Core -->
        <Array_3D_Spectrum>
            <name>VIRS Image Cube Tile 13SE</name>
            <local_identifier>Spectral_Cube_Object</local_identifier>            
            <offset unit="byte">0</offset>
            <axes>3</axes>
            <axis_index_order>Last Index Fastest</axis_index_order>
            <description>The core of the image cube has 105 spectral bands with center
                wavelengths from 303 to 1448 nanometers. Wavelengths are given
                in the VIRS Wavelength file. Bands have 1361 lines and 2081
                4-byte floating-point pixels per line. Bands are stored
                sequentially in the cube.</description>
            <Element_Array>
                <!-- Pixels are floating-point, 4-byte, single-precision, LSB ("Intel") values -->
                <data_type>IEEE754LSBSingle</data_type>
                <unit>Reflectance</unit>
            </Element_Array>
            <Axis_Array>
                <axis_name>Band</axis_name>
                <elements>105</elements>
                <sequence_number>1</sequence_number>
            </Axis_Array>
            <Axis_Array>
                <axis_name>Line</axis_name>
                <elements>1361</elements>
                <sequence_number>2</sequence_number>
            </Axis_Array>
            <Axis_Array>
                <axis_name>Sample</axis_name>
                <elements>2081</elements>
                <sequence_number>3</sequence_number>
            </Axis_Array>
            <Special_Constants>
                <missing_constant>-999.0</missing_constant>
            </Special_Constants>
        </Array_3D_Spectrum>

        <!-- Backplane 1 -->
        <Array_2D_Image>
            <name>Incidence Angle</name>
            <offset unit="byte">1189541220</offset> <!-- 105 bands * lines * samples * 4 bytes -->
            <axes>2</axes>
            <axis_index_order>Last Index Fastest</axis_index_order>
            <description>The Incidence Angle backplane contains the incidence angle of
                MASCS/VIRS observations used in cube</description>
            <Element_Array>
                <!-- Pixels are floating-point, 4-byte, single-precision, LSB ("Intel") values -->
                <data_type>IEEE754LSBSingle</data_type>
                <unit>degree</unit>
            </Element_Array>
            <Axis_Array>
                <axis_name>Line</axis_name>
                <elements>1361</elements>
                <sequence_number>1</sequence_number>
            </Axis_Array>
            <Axis_Array>
                <axis_name>Sample</axis_name>
                <elements>2081</elements>
                <sequence_number>2</sequence_number>
            </Axis_Array>
        </Array_2D_Image>

        <!-- Backplane 2 -->
        <Array_2D_Image>
            <name>Emission Angle</name>
            <offset unit="byte">1200870184</offset> <!-- 106 bands * lines * samples * 4 bytes -->
            <axes>2</axes>
            <axis_index_order>Last Index Fastest</axis_index_order>
            <description>The Emission Angle backplane contains the emission angle of
                MASCS/VIRS observations used in cube</description>
            <Element_Array>
                <!-- Pixels are floating-point, 4-byte, single-precision, LSB ("Intel") values -->
                <data_type>IEEE754LSBSingle</data_type>
                <unit>degree</unit>
            </Element_Array>
            <Axis_Array>
                <axis_name>Line</axis_name>
                <elements>1361</elements>
                <sequence_number>1</sequence_number>
            </Axis_Array>
            <Axis_Array>
                <axis_name>Sample</axis_name>
                <elements>2081</elements>
                <sequence_number>2</sequence_number>
            </Axis_Array>
        </Array_2D_Image>
        
        <!-- Backplane 3 -->
        <Array_2D_Image>
            <name>Phase Angle</name>
            <offset unit="byte">1212199148</offset> <!-- 107 bands * lines * samples * 4 bytes -->
            <axes>2</axes>
            <axis_index_order>Last Index Fastest</axis_index_order>
            <description>The Phase Angle backplane contains the phase angle of
                MASCS/VIRS observations used in cube</description>
            <Element_Array>
                <!-- Pixels are floating-point, 4-byte, single-precision, LSB ("Intel") values -->
                <data_type>IEEE754LSBSingle</data_type>
                <unit>deg</unit>
            </Element_Array>
            <Axis_Array>
                <axis_name>Line</axis_name>
                <elements>1361</elements>
                <sequence_number>1</sequence_number>
            </Axis_Array>
            <Axis_Array>
                <axis_name>Sample</axis_name>
                <elements>2081</elements>
                <sequence_number>2</sequence_number>
            </Axis_Array>
        </Array_2D_Image>
        
        <!-- Backplane 4 -->
        <Array_2D_Image>
            <name>Observation Area</name>
            <offset unit="byte">1223528112</offset> <!-- 108 bands * lines * samples * 4 bytes -->
            <axes>2</axes>
            <axis_index_order>Last Index Fastest</axis_index_order>
            <description>The Observation Area backplane contains the area of
                MASCS/VIRS observations used in cube</description>
            <Element_Array>
                <!-- Pixels are floating-point, 4-byte, single-precision, LSB ("Intel") values -->
                <data_type>IEEE754LSBSingle</data_type>
                <unit>km**2</unit>
            </Element_Array>
            <Axis_Array>
                <axis_name>Line</axis_name>
                <elements>1361</elements>
                <sequence_number>1</sequence_number>
            </Axis_Array>
            <Axis_Array>
                <axis_name>Sample</axis_name>
                <elements>2081</elements>
                <sequence_number>2</sequence_number>
            </Axis_Array>
        </Array_2D_Image>
        
        <!-- Backplane 5 -->
        <Array_2D_Image>
            <name>NIR Temperature</name>
            <offset unit="byte">1234857076</offset> <!-- 109 bands * lines * samples * 4 bytes -->
            <axes>2</axes>
            <axis_index_order>Last Index Fastest</axis_index_order>
            <description>The NIR Temperature backplane contains the NIR detector 
                temperature of MASCS/VIRS observations used in cube</description>
            <Element_Array>
                <!-- Pixels are floating-point, 4-byte, single-precision, LSB ("Intel") values -->
                <data_type>IEEE754LSBSingle</data_type>
                <unit>degC</unit>
            </Element_Array>
            <Axis_Array>
                <axis_name>Line</axis_name>
                <elements>1361</elements>
                <sequence_number>1</sequence_number>
            </Axis_Array>
            <Axis_Array>
                <axis_name>Sample</axis_name>
                <elements>2081</elements>
                <sequence_number>2</sequence_number>
            </Axis_Array>
        </Array_2D_Image>
        
        <!-- Backplane 6 -->
        <Array_2D_Image>
            <name>Source CDR Date</name>
            <offset unit="byte">1246186040</offset> <!-- 110 bands * lines * samples * 4 bytes -->
            <axes>2</axes>
            <axis_index_order>Last Index Fastest</axis_index_order>
            <description>The Source CDR Date backplane contains the CDR Date of
                MASCS/VIRS observations used in cube.
                Date is encoded in the integer part of the real value as YYDOY.
                The CDR date, CDR time can be used to find the CDR/DDR file where the observation
                source data is stored, while the spectrum number can be used to find the CDR/DDR
                record associated to the observation.</description>
            <Element_Array>
                <!-- Pixels are floating-point, 4-byte, single-precision, LSB ("Intel") values -->
                <data_type>IEEE754LSBSingle</data_type>
            </Element_Array>
            <Axis_Array>
                <axis_name>Line</axis_name>
                <elements>1361</elements>
                <sequence_number>1</sequence_number>
            </Axis_Array>
            <Axis_Array>
                <axis_name>Sample</axis_name>
                <elements>2081</elements>
                <sequence_number>2</sequence_number>
            </Axis_Array>
        </Array_2D_Image>
        
        <!-- Backplane 7 -->
        <Array_2D_Image>
            <name>Source CDR Time</name>
            <offset unit="byte">1257515004</offset> <!-- 111 bands * lines * samples * 4 bytes -->
            <axes>2</axes>
            <axis_index_order>Last Index Fastest</axis_index_order>
            <description>The Source CDR Time backplane contains the CDR Time of
                MASCS/VIRS observations used in cube.
                Time is encoded in the integer part of the real value as HHMMSS.
                The CDR date, CDR time can be used to find the CDR/DDR file where the observation
                source data is stored, while the spectrum number can be used to find the CDR/DDR
                record associated to the observation.</description>
            <Element_Array>
                <!-- Pixels are floating-point, 4-byte, single-precision, LSB ("Intel") values -->
                <data_type>IEEE754LSBSingle</data_type>
            </Element_Array>
            <Axis_Array>
                <axis_name>Line</axis_name>
                <elements>1361</elements>
                <sequence_number>1</sequence_number>
            </Axis_Array>
            <Axis_Array>
                <axis_name>Sample</axis_name>
                <elements>2081</elements>
                <sequence_number>2</sequence_number>
            </Axis_Array>
        </Array_2D_Image>
        
        <!-- Backplane 8 -->
        <Array_2D_Image>
            <name>Source CDR Spectrum Number</name>
            <offset unit="byte">1268843968</offset> <!-- 112 bands * lines * samples * 4 bytes -->
            <axes>2</axes>
            <axis_index_order>Last Index Fastest</axis_index_order>
            <description>The Source CDR Spectrum Number backplane contains the spectrum number of
                MASCS/VIRS observations used in cube.
                The CDR date, CDR time can be used to find the CDR/DDR file where the observation
                source data is stored, while the spectrum number can be used to find the CDR/DDR
                record associated to the observation.</description>
            <Element_Array>
                <!-- Pixels are floating-point, 4-byte, single-precision, LSB ("Intel") values -->
                <data_type>IEEE754LSBSingle</data_type>
            </Element_Array>
            <Axis_Array>
                <axis_name>Line</axis_name>
                <elements>1361</elements>
                <sequence_number>1</sequence_number>
            </Axis_Array>
            <Axis_Array>
                <axis_name>Sample</axis_name>
                <elements>2081</elements>
                <sequence_number>2</sequence_number>
            </Axis_Array>
        </Array_2D_Image>
        
    </File_Area_Observational>
    
    <File_Area_Observational_Supplemental>
        <File>
            <file_name>virs_cube_64ppd_h13se.hdr</file_name>
            <comment>Supplemental information used to display image with ENVI commercial software</comment>
        </File>
        <Stream_Text>
            <offset unit="byte">0</offset>
            <parsing_standard_id>7-Bit ASCII Text</parsing_standard_id>
            <record_delimiter>Carriage-Return Line-Feed</record_delimiter>
        </Stream_Text>
    </File_Area_Observational_Supplemental>
    
</Product_Observational>