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src/test/resources/github238/valid/data_spectra/kgrs_calibrated_spectra_per4.xml
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| <?xml version="1.0" encoding="UTF-8"?> | ||
| <?xml-model href="https://pds.nasa.gov/pds4/pds/v1/PDS4_PDS_1B00.sch" schematypens="http://purl.oclc.org/dsdl/schematron"?> | ||
|
|
||
| <Product_Observational xmlns="http://pds.nasa.gov/pds4/pds/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_1B00.xsd"> | ||
| <Identification_Area> | ||
| <logical_identifier>urn:nasa:pds:kaguya_grs_spectra:data_spectra:kgrs_calibrated_spectra_per4</logical_identifier> | ||
| <version_id>1.0</version_id> | ||
| <title>Kaguya Gamma-Ray Spectrometer Corrected Spectra</title> | ||
| <information_model_version>1.11.0.0</information_model_version> | ||
| <product_class>Product_Observational</product_class> | ||
| <Modification_History> | ||
| <Modification_Detail> | ||
| <modification_date>2019-09-30</modification_date> | ||
| <version_id>1.0</version_id> | ||
| <description>First release</description> | ||
| </Modification_Detail> | ||
| </Modification_History> | ||
| </Identification_Area> | ||
| <Observation_Area> | ||
| <Time_Coordinates> | ||
| <start_date_time>2009-02-10T18:26:40Z</start_date_time> | ||
| <stop_date_time>2009-05-28T07:43:22Z</stop_date_time> | ||
| </Time_Coordinates> | ||
| <Primary_Result_Summary> | ||
| <purpose>Science</purpose> | ||
| <processing_level>Derived</processing_level> | ||
| <description> | ||
| This collection contains Kaguya Gamma-Ray Spectrometer (KGRS) corrected and calibrated time-series | ||
| spectra acquired during the nominal and extended observation periods of JAXA's SELENE (Kaguya) mission. | ||
|
|
||
| The SELENE mission was the Japanese mission to the Moon with a main orbiter “Kaguya” and | ||
| two daughter relay satellites launched on Sep. 14, 2007. KGRS was mounted on the deck of the | ||
| main orbiter. It employed a high-purity Ge (HPGe) crystal as a main detector, and surrounding | ||
| BGO and plastic scintillators as anti-coincidence detectors to reduce backgrounds. The | ||
| Ge crystal was cooled by a Sterling refrigerator. It made close-proximity observations of the | ||
| Moon from Dec. 14, 2007 to Dec. 11, 2008 at the high circular orbital altitude of 100 km, and | ||
| from Feb. 10 to May 28 in 2009 at the low elliptical orbital altitude of ~30 x 50 km. | ||
|
|
||
| KGRS recorded energy spectra of gamma rays in two gain modes simultaneously; high gain (0.1 | ||
| to 3 MeV) and low gain (0.1 to 13 MeV), each of which was analyzed by the 13-bit (8192 ch) | ||
| analog-to-digital converter (ADC). While the former has a higher spectral resolution over the | ||
| energy range of radioactive elements, the latter has better statistics and covers the whole energy | ||
| range of major rock-forming elements, including the Fe neutron capture line at 7.6 MeV. The | ||
| accumulation time of each spectrum was 17 s. Both modes of spectra are included in this archive. | ||
|
|
||
| The observation epochs of KGRS consists of three regular measurement periods (Period 1 to 3), | ||
| background measurements, and the annealing of the Ge crystal. The HPGe detector was annealed | ||
| from 16 to 25, December 2008, which improved energy resolution by a factor of two. | ||
| Period 1 and 2 lasted two and five months, respectively, with limited spatial or spectral | ||
| resolutions. Period 3 lasted ~3.5 months (including dead time) with the best spatial and spectral | ||
| resolutions. In addition, spectra from the background measurement when the satellite was flipped | ||
| and the detector faced deep space can be analyzed to estimate the background gamma-ray intensity | ||
| from the satellite due to the exposure to galactic cosmic rays. | ||
|
|
||
| The following data reduction processes, based on those successfully used for Lunar Prospector and | ||
| Dawn missions, were applied to the raw time-series spectra of KGRS: 1) Filtering of invalid events, | ||
| 2) ADC Differential Non-Linearity, and 3) Gain correction and energy calibration. Correction factors | ||
| for satellite altitude and galactic cosmic ray intensities are provided as part of the KGRS ephemeris | ||
| data. | ||
| </description> | ||
| </Primary_Result_Summary> | ||
| <Investigation_Area> | ||
| <name>Kaguya</name> | ||
| <type>Mission</type> | ||
| <Internal_Reference> | ||
| <lid_reference>urn:nasa:pds:context:investigation:mission.kaguya</lid_reference> | ||
| <reference_type>data_to_investigation</reference_type> | ||
| </Internal_Reference> | ||
| </Investigation_Area> | ||
| <Observing_System> | ||
| <name>Kaguya</name> | ||
| <Observing_System_Component> | ||
| <name>Kaguya</name> | ||
| <type>Spacecraft</type> | ||
| <Internal_Reference> | ||
| <lid_reference>urn:nasa:pds:context:instrument_host:spacecraft.kaguya</lid_reference> | ||
| <reference_type>is_instrument_host</reference_type> | ||
| </Internal_Reference> | ||
| </Observing_System_Component> | ||
| <Observing_System_Component> | ||
| <name>GRS</name> | ||
| <type>Instrument</type> | ||
| <Internal_Reference> | ||
| <lid_reference>urn:nasa:pds:context:instrument:kaguya.grs</lid_reference> | ||
| <reference_type>is_instrument</reference_type> | ||
| </Internal_Reference> | ||
| </Observing_System_Component> | ||
| </Observing_System> | ||
| <Target_Identification> | ||
| <name>Moon</name> | ||
| <type>Satellite</type> | ||
| <Internal_Reference> | ||
| <lid_reference>urn:nasa:pds:context:target:satellite.earth.moon</lid_reference> | ||
| <reference_type>collection_to_target</reference_type> | ||
| </Internal_Reference> | ||
| </Target_Identification> | ||
| </Observation_Area> | ||
| <Reference_List> | ||
| <Internal_Reference> | ||
| <lid_reference>urn:nasa:pds:kaguya_grs_spectra:document:kgrs_calibrated_spectra</lid_reference> | ||
| <reference_type>data_to_document</reference_type> | ||
| </Internal_Reference> | ||
| </Reference_List> | ||
| <File_Area_Observational> | ||
| <File> | ||
| <file_name>kgrs_calibrated_spectra_per4.csv</file_name> | ||
| <creation_date_time>2019-08-22T22:26:09Z</creation_date_time> | ||
| </File> | ||
| <Table_Delimited> | ||
| <offset unit="byte">0</offset> | ||
| <parsing_standard_id>PDS DSV 1</parsing_standard_id> | ||
| <description> | ||
| This archive consists of three spectrum files (each corresponding to one KGRS epoch) and one unified | ||
| EPG file. The spectrum files contain a time series of corrected and calibrated pulse height spectra | ||
| acquired by KGRS's HPGe detector in the lunar orbit. In the spectrum files, each row contains the | ||
| spacecraft clock (sclk) ticks and UTC time corresponding to the end of the accumulation interval | ||
| (17 s), with the two sets of the 8192-channel HPGe spectra accumulated. In the EPG file, each row | ||
| starts with sclk recorded at the end of the accumulation interval to match spacecraft positions, | ||
| pointing, and correction factors with the corrected spectra. Note that the UTC time and ephemeris time | ||
| included in the EPG file correspond to the midpoint of the accumulation interval. | ||
| </description> | ||
| <records>527736</records> | ||
| <record_delimiter>Carriage-Return Line-Feed</record_delimiter> | ||
| <field_delimiter>Comma</field_delimiter> | ||
| <Record_Delimited> | ||
| <fields>10</fields> | ||
| <groups>2</groups> | ||
| <Field_Delimited> | ||
| <name>sclk</name> | ||
| <field_number>1</field_number> | ||
| <data_type>ASCII_Integer</data_type> | ||
| <unit>seconds</unit> | ||
| <description> | ||
| Spacecraft clock (sclk) ticks at the end of the accumulation interval in seconds. The origin | ||
| of the sclk is Jan 6, 1980, 0:0:0. Each spectrum, scaler value, and ephemeris have a unique | ||
| sclk value, which can be used as an identifier. Kaguya's sclk is also known as a time index | ||
| (TI). | ||
| </description> | ||
| </Field_Delimited> | ||
| <Field_Delimited> | ||
| <name>utc</name> | ||
| <field_number>2</field_number> | ||
| <data_type>ASCII_String</data_type> | ||
| <description>UTC time corresponding to the sclk at the end of the accumulation interval</description> | ||
| </Field_Delimited> | ||
| <Field_Delimited> | ||
| <name>Period</name> | ||
| <field_number>3</field_number> | ||
| <data_type>ASCII_Integer</data_type> | ||
| <description>Epoch of the Kaguya GRS mission, 1-3.</description> | ||
| </Field_Delimited> | ||
| <Field_Delimited> | ||
| <name>background_observation</name> | ||
| <field_number>4</field_number> | ||
| <data_type>ASCII_Integer</data_type> | ||
| <description> | ||
| A flag to indicate the special operations of the Kaguya spacecraft where it was flipped and the GRS | ||
| was pointed to the deep space to measure background gamma rays from spacecraft. 0 indicates nominal | ||
| measurements suitable for geochemical study of the Moon. 1 indicates spectra were obtained during | ||
| the background-measuring operations. | ||
| </description> | ||
| </Field_Delimited> | ||
| <Field_Delimited> | ||
| <name>live_time</name> | ||
| <field_number>5</field_number> | ||
| <data_type>ASCII_Real</data_type> | ||
| <unit>seconds</unit> | ||
| <description>Live time of the spectrometer</description> | ||
| </Field_Delimited> | ||
| <Field_Delimited> | ||
| <name>ge_over</name> | ||
| <field_number>6</field_number> | ||
| <data_type>ASCII_Integer</data_type> | ||
| <description> | ||
| Overload scaler value for the HPGe detector. A good proxy for variations in intensities of galactic | ||
| cosmic rays. | ||
| </description> | ||
| </Field_Delimited> | ||
| <Field_Delimited> | ||
| <name>offset_HG</name> | ||
| <field_number>7</field_number> | ||
| <data_type>ASCII_Real</data_type> | ||
| <description>0th order coefficient for calibration of ADC channels to energies for high-gain spectra</description> | ||
| </Field_Delimited> | ||
| <Field_Delimited> | ||
| <name>gain_HG</name> | ||
| <field_number>8</field_number> | ||
| <data_type>ASCII_Real</data_type> | ||
| <description>1st order coefficient for calibration of ADC channels to energies for high-gain spectra</description> | ||
| </Field_Delimited> | ||
| <Field_Delimited> | ||
| <name>offset_LG</name> | ||
| <field_number>9</field_number> | ||
| <data_type>ASCII_Real</data_type> | ||
| <description>0th order coefficient for calibration of ADC channels to energies for low-gain spectra</description> | ||
| </Field_Delimited> | ||
| <Field_Delimited> | ||
| <name>gain_LG</name> | ||
| <field_number>10</field_number> | ||
| <data_type>ASCII_Real</data_type> | ||
| <description>1st order coefficient for calibration of ADC channels to energies for low-gain spectra</description> | ||
| </Field_Delimited> | ||
| <Group_Field_Delimited> | ||
| <group_number>1</group_number> | ||
| <repetitions>8192</repetitions> | ||
| <fields>1</fields> | ||
| <groups>0</groups> | ||
| <Field_Delimited> | ||
| <name>high_gain_histogram</name> | ||
| <field_number>1</field_number> | ||
| <data_type>ASCII_Integer</data_type> | ||
| <description> | ||
| 8192-channel, high-gain calibrated HPGe spectrum covering up to ~3.3 MeV. | ||
| The pulse height of each channel (0-8191), E, is given by E (keV) = gain_HG x ch + offset_HG. | ||
| </description> | ||
| </Field_Delimited> | ||
| </Group_Field_Delimited> | ||
| <Group_Field_Delimited> | ||
| <group_number>2</group_number> | ||
| <repetitions>8192</repetitions> | ||
| <fields>1</fields> | ||
| <groups>0</groups> | ||
| <Field_Delimited> | ||
| <name>low_gain_histogram</name> | ||
| <field_number>1</field_number> | ||
| <data_type>ASCII_Integer</data_type> | ||
| <description> | ||
| 8192-channel, low-gain calibrated HPGe spectrum covering up to ~13 MeV. | ||
| The pulse height of each channel (0-8191), E, is given by E (keV) = gain_LG x ch + offset_LG. | ||
| </description> | ||
| </Field_Delimited> | ||
| </Group_Field_Delimited> | ||
| </Record_Delimited> | ||
| </Table_Delimited> | ||
| </File_Area_Observational> | ||
| </Product_Observational> |
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