GB/T 33998-2017 Lunar Information Metadata GB/T33998-2017 |tt||Standard compression package decompression password: www.bzxz.net
This standard specifies the structure and content of lunar information metadata and defines the data dictionary of lunar information metadata. This standard applies to the description, generation, archiving, publication, exchange and application of various types of lunar information.

ICS07.040
National Standard of the People's Republic of China
GB/T33998—2017
Lunar information metadata
Published on July 12, 2017
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Standardization Administration of China
Implementation on February 1, 2018
GB/T33998—2017
Terms and Definitions
3 Metadata Structure and Content
3.1 Metadata Description
3.2 Metadata Concept Structure
3.3 Metadata Content
Metadata Information
Data Identification Information
Reference System Information
Data Attribute Information
Data Quality Information|| tt||Data archive information
Data volume information
Data restriction information
Responsible party information
Data dictionary
Content description·
Attribute description·
English name
Constraints/conditions
Maximum number of occurrences
Data type
Appendix A (Normative Appendix) Lunar information metadata data dictionary Appendix B (Informative Appendix)
Appendix C (Informative Appendix)
References
Code table
Conceptual model
This standard was drafted in accordance with the rules given in GB/T1.12009. This standard was proposed by the Chinese Academy of Sciences.
This standard is under the jurisdiction of the National Technical Committee for Space Science and Its Application Standardization (SAC/TC312). The responsible drafting unit of this standard is the National Astronomical Observatory of the Chinese Academy of Sciences. The main drafters of this standard are Zuo Wei, Zhang Zhoubin, Mou Lingli, Liu Jianjun, Ren Xin, Zeng Xingguo, and Li Chunlai. GB/T33998—2017
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1 Scope
Lunar information metadata
GB/T33998—2017
This standard specifies the structure and content of lunar information metadata and defines the data dictionary of lunar information metadata. This standard applies to the description, generation, archiving, publication, exchange and application of various types of lunar information. Terms and definitions
The following terms and definitions apply to this document. 2.1
Datasetdataset
A collection of identifiable data.
Note: A dataset can be physically a smaller part of a larger dataset through restrictions such as spatial extent or feature type. Theoretically, a dataset can be as small as a single feature or feature attribute within a larger dataset. A hard copy map or chart can be considered as a data set. [GB/T19710—2005, definition 4.2]
Lunar information
lunarinformation
Information about lunar resources obtained by lunar probes2.3
metadata of lunar informationMetadata of lunar information
Data describing lunar information data.
metadata element
metadata attribute
Metadata attribute
Basic unit of metadata.
Note 1: A metadata element is unique in a metadata entity. Note 2: Rewrite GB/T19710—2005, definition 4.6.2.5
metadata entity
Metadata entity
A group of metadata elements that describe the same characteristics of data. Note: It can be a single entity or an aggregate entity containing one or more entities. [GB/T19710—2005, definition 4.7]
Metadata subset
metadata section
Metadata package metadatapackage
A subset of metadata, consisting of related metadata entities and elements. Note: Rewrite GB/T19710—2005, definition 4.8. 3
Metadata structure and content
Metadata description
This standard uses a metadata data dictionary (see Appendix A), a code table (see Appendix B) and a conceptual model (see Appendix C for conceptual model description)1
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GB/T33998—2017
to describe lunar information metadata. The basic structure of metadata is described through the conceptual model structure diagram (ER diagram) (see Figures 2 to 10), and the metadata characteristics and content are described in detail through the data dictionary and code table. 3.2 Metadata conceptual structure
The lunar information metadata consists of a metadata information subset (conceptual model package) and its eight associated subsets, see Table 1. Table 1 Comparison table of metadata sets and metadata entities of lunar information metadata Serial number
Set/subset name
Metadata information
Data identification information
Reference system information
Data attribute information
Data quality information
Data archive information
Data volume information
Data restriction information
Responsible party information
Entity name
Metadata
Data identification
Reference system
Data attribute
Data quality
Data archive
Data volume
Data restriction
Responsible party
English name
Metadata
Data_Identification
Reference_System
Data_Attribute
Data_Quality
Data archive
Data volume
Data restriction
Responsible party
lity
Data_Archives
Data_Volume
Data_Constraints
Responsible_Party
ER diagram
Data dictionary
Describes all metadata of lunar information
Describes basic information of lunar data
Describes the temporal and spatial reference system used by the dataset
Description of lunar data attribute information
Provides overall evaluation information of dataset data quality
Description of lunar data archive information
Describes information about lunar data collection
Restrictions on access to and use of datasets or metadata
Information on the responsible unit or
person in charge related to the dataset
Each subset consists of several entities (conceptual model entities) and elements (conceptual model attributes). Reusable entities are called by other subsets and are not used separately. Figure 1 describes the conceptual structure of lunar information metadata. Each metadata package contains one or more metadata entities and metadata elements.
Reference system information
Responsible party information
Data archive information
Data identification information
Metadata information
Data volume information
Figure 1 Conceptual structure of lunar information metadata
Data quality information
Data attribute information
Data restriction information
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3.3 Metadata content
3.3.1 Metadata Information
GB/T33998—2017
The metadata information entity describes all metadata information of lunar information, which is represented by the mandatory entity metadata (Metadata). Metadata consists of the following metadata entities and metadata elements: a) Mandatory entities:
Data identification (Data_Identification); Data attributes (Data_Attribute); Data archives (Data_Archives);
Responsible_Party); Metadata character set (Character_Set). b) Optional entities:
Reference system (Reference_System); Data quality (Data_Quality);
Data volume (Data_Volume);
Data constraints (Data_Constraints). Mandatory elements:
Metadata identifier;
Unique metadata language;
Metadata creation date.
d) Optional elements:
Metadata standard name:
Unified metadata standard version.
Metadata ER diagram is shown in Figure 2.It is the abbreviation of PrimaryIdentifier.The identified element is the primary element of the entity (that is, the element that can uniquely identify a piece of data in the entity. It is called the primary key in the physical model); "M" is the abbreviation of Mandatory in English, which means that the mandatory drug bundle cannot be empty, and the element value corresponding to the element identified by "M" cannot be empty. HiiKAoNniKAca
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Data volume name
Data volume format
Data volume
Data volume description
Start time of data in the volume
End time of data in the volume
Data volume generation time
Data level in the volume
Instrument to which the data in the volume belongs
Metadata identifier
Complete data language
Metadata creation date
Metadata standard name
Metadata standard version
Data identifier
Data name
Data language
Data description
References
Orbit number
Detection cycle number| |tt||String
Share symbol review
Study symbol
Date type
Date type
String
String
Metadata
pi>String
Study symbol review
Date type
String
String
Data identifier
Spi>String
Character review
String
String
String
String
Data attribute
Data attribute name
Data attribute type
Data attribute precision
Data attribute range
Data attribute description
String
Shared Character Review
String
String
String
Data Quality
Quality Description
Processing Event
Data Source
3.3.2 Data Identification Information
String
String
String
Domain code
Chinese name
English name
Archive time
Backup status
Backup time
Publish status
Migration time
Migration time
Metadata character set
Code table
String
Li Te Shi
Character Shi
String
Data archiving
Date type
Date type<M>
Date type
Date type
Retention period unit
Retention period
Archive location
Archive system name
Device name
Media name
Volume location
String
String
String
String| |tt||string
string
string
string
reference system
reference system description string
string
data restrictions
usage restrictions
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access restrictions string
purpose restrictions
string
legal restrictions string
responsible party
responsible party identifier||t t||Name of person in charge
Figure 2 Metadata ER diagram
Name of responsible unit
Email
String
Xiang Fu Shi
String
Li Fu String
String
String
String
Data identification information is the basic information describing lunar data, which is represented by the mandatory entity data identification (Data_Identification). Data identification consists of the following metadata entities and elements: a) Mandatory entity:
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Data entity (Data_Entity).
b) Optional entities:
Mission;
Explorer;
Instrument;
Instrument_Parameter; Data_Production;
Orbit_Param;
Data_Coverage. Required elements:
Data identifier;
Data name;
Data description;
Orbit number.
Optional elements:
References.
See Figure 3 for the data identification ER diagram.
GB/T33998—2017
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Data Identification
Data Identifier
Data Description
Detection Cycle Number
Entity Identifier
Entity Name
Entity Type
Entity Version
Entity Description
Data Standard
Spi>Character
String
String
String
Data Entity String
String
String
String
String
String
Receive data ground station name
Receive data ground station identifier
Creation time
Publish time
Type identifier
Collection start time
Collection end time
Character string
String
Expiration type
Expiration type
Character string
First type
Date type
SPi> Symbol
Task identifier
Task name
Task description
Detection object
Service start time
Task end time
Service phase name
Task phase start time
Service phase end time
Instrument identifier
Instrument name
Instrument description
Instrument host identifier
Instrument host name
Instrument start time
Instrument shutdown time
Instrument phase task name
String
Time type
Time type
Date type
String
Character review
String
String
First period type
Date type
Character string
Instrument stage task start time
Instrument stage task shutdown time
Instrument parameters
Self period type
Date type
Instrument zero number name
string
Instrument parameter value
Instrument parameter description
3.3.3 Reference system information
String
Metadata identifier
Metadata language
End Data creation date
End Data standard name
End Data standard version
Metadata
Spi> String
String
Period type
Study special string
Study character string
Data processing
Data processing method character review
Data processing procedure
Character string
Data processing unit
Character review
Revision History
String
Data coverage
Data coverage description string
Spatial resolution
Temporal coverage
Orbit coverage
Epoch time
Semi-major axis
Eccentricity
Orbit inclination
String
Orbit parameters
String
Double precision
Double precision
Double precision
Double precision
Ascending node Tai longitude
Perigee angular distance double precision
Detector
Detector identifier
Detector name
Detector type
Detector description
Detector mission start time
Detector mission end time
Detector mission phase name
Detector in-service phase start time
Detector mission phase end time
Figure 3 Data identification ER diagram
Reference system information is the description of the temporal and spatial reference system used by the dataset, which is represented by the optional entity Reference_System. The reference system consists of the following metadata entities and elements: a) Required entity:
Lunar reference coordinate system code (Lunar_Reference_Coordinate_System_Code). b) Optional entity:
Reference sphere (Reference_Ellipsoid); projection (Map_Projection).
Required element:
Reference system description.
d) Optional element:
A datum.
See Figure 4 for the ER diagram of the reference system
String
Reference system description
Projection identifier
Projection description
String
Reference system
Map projection entity type
Row projection offset
Column projection offset
Positive direction of meridian
Central parallel
Central meridian
Map projection rotation
3.3.4 Data attribute information
Character string
Character string
string
string
string
string
string
string
string
string
string
metadata identifier
metadata language
metadata creation date
metadata standard name
metadata standard version
metadata
string
GB/T33998—2017
issue type
String
String
Lunar reference coordinate system code
Code table
Domain code
Chinese name
English name
Reference ellipsoid identifier
Reference ellipsoid description
A-axis radius
B-axis radius
C-axis radius
Reference system ER diagram
Academic symbol
Character special character
String
Character special character
String
Reference sphere
Character special character
String
String
Data attribute information is a description of the lunar data attribute information, which is represented by the required entity data attribute (Data_Attribute). Data attributes are composed of the following metadata elements:
a) Required elements:
Data attribute name;
Data attribute type.
b) Optional elements:
Data attribute precision;
Data attribute value range;
Data attribute description.
GB/T33998—2017
The ER class diagram of data attributes is shown in Figure 5.
5Data quality information
Metadata identifier
Metadata language
Metadata creation date
Metadata standard name
Metadata standard version
Metadata
Character
String
Date type
String
Character
Data attribute
Data attribute name
Data attribute type
Data attribute precision
Data attribute range
Data attribute description
String
String
String
String
Data attribute ER diagram
Data quality information is the overall evaluation of the data quality of the lunar dataset, which is represented by the optional entity Data_Quality. Data quality consists of the following metadata entities and elements: a) Optional entity:
Data quality level (Quality_Level). b) Mandatory element:
Quality description.
Optional element:
Processing event;
Data source.
Data quality entity ER diagram is shown in Figure 6
Data quality
Quality description
String<M>
Processing event string
Data source
String
Data quality level
Metadata identifier
Metadata language
Metadata
Metadata creation date
Metadata standard name
Metadata standard version
Domain code
Chinese name
English name
Data quality ER diagram
Beautiful
Date type
String
String
Code table
Character car
String
String
String
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