Difference between revisions of "Attribute Convention for Data Discovery 1-2 Working"
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; title : A short phrase or sentence describing the dataset. | ; title : A short phrase or sentence describing the dataset. | ||
; summary : A paragraph describing the dataset, analogous to an abstract for a paper. | ; summary : A paragraph describing the dataset, analogous to an abstract for a paper. | ||
− | ; keywords : A comma-separated list of key words and/or phrases. | + | ; keywords : A comma-separated list of key words and/or phrases. Keywords may be common words or phrases, terms from a controlled vocabulary, or URIs for terms from a controlled vocabulary (see keyword_vocabulary below).{'''Problems'''—see [[Talk:Attribute_Convention_for_Data_Discovery_%28ACDD%29_Working#3._Keywords|Discussion]]} |
== Recommended == | == Recommended == |
Revision as of 16:58, May 20, 2013
Introduction
This page consolidates ongoing work seeking to improve the definitions in the Attribute Convention for Data Discovery (ACDD).
The first 3 sections represent the terms in the corresponding sections of the ACDD.
Modifications relative to the original text may be seen with the history mechanism of this wiki. The original definitions are marked with the Summary keyword Original Definitions.
Process
The edits will be made in this page by anyone in the community who wishes to contribute, and discussed in greater depth in the Discussion page, if necessary. (The discussion page can also be used as an archive of changes on this page, if desired.)
Once there is some consensus about one or a group of definitions, they can be migrated to the primary document and the version number of that document incremented.
Working Definitions
Highly Recommended
- title
- A short phrase or sentence describing the dataset.
- summary
- A paragraph describing the dataset, analogous to an abstract for a paper.
- keywords
- A comma-separated list of key words and/or phrases. Keywords may be common words or phrases, terms from a controlled vocabulary, or URIs for terms from a controlled vocabulary (see keyword_vocabulary below).{Problems—see Discussion}
Recommended
- id
- An identifier for the data set, provided by and unique within its naming authority. The combination of the "naming authority" and the "id" should be globally unique, but the id can be globally unique by itself also. IDs can be URLs, URNs, DOIs, meaningful text strings, a local key, or any other unique string of characters. The id should not include blanks.
- naming_authority
- The organization that provides the initial id (see above) for the dataset. The naming authority should be uniquely specified by this attribute.
- keywords_vocabulary
- If you are using a controlled vocabulary for the words/phrases in your "keywords" attribute, identify that vocabulary here. The keywords vocabulary should be uniquely specified by this attribute.
John Got This Far (So Far)
- cdm_data_type
- The THREDDS data type appropriate for this dataset.
- history
- Provides an audit trail for modifications to the original data.
- comment
- Miscellaneous information about the data.
- date_created
- The date on which the version of the data in the file was created.
- creator_name
- The name of the person principally responsible for the data in the file; may be the principal investigator. The "institution" attribute will be used if the "creator_name" attribute does not exist.
- creator_url
- The URL of the person principally responsible for the data in the file.
- creator_email
- The email address of the person principally responsible for the data in the file.
- institution
- The "institution" attribute will be used if the "creator_name" attribute does not exist.
- project
- The name of the scientific project that produced the data.
- processing_level
- A textual description of the processing (or quality control) level of the data.
- acknowledgement
- A place to acknowledge various type of support for the project that produced this data.
- geospatial_bounds
- Describes geospatial extent using any of the geometric objects (2D or 3D) supported by the Well-Known Text (WKT) format.
- geospatial_lat_min
- Describes a simple latitude/longitude bounding box. geospatial_lat_min specifies the southernmost latitude; geospatial_lat_max specifies the northernmost latitude; geospatial_lon_min specifies the westernmost longitude; geospatial_lon_max specifies the easternmost longitude of the bounding box. The values of geospatial_lon_min and geospatial_lon_max reflect the actual longitude data values. Cases where geospatial_lon_min is greater than geospatial_lon_max indicate the bounding box extends from geospatial_lon_max, through the longitude range discontinuity meridian (either the antimeridian or Prime Meridian), to geospatial_lon_min. For a more detailed geospatial coverage, see the suggested geospatial attributes.
- geospatial_lat_max
- Describes a simple latitude/longitude bounding box. geospatial_lat_min specifies the southernmost latitude; geospatial_lat_max specifies the northernmost latitude; geospatial_lon_min specifies the westernmost longitude; geospatial_lon_max specifies the easternmost longitude of the bounding box. The values of geospatial_lon_min and geospatial_lon_max reflect the actual longitude data values. Cases where geospatial_lon_min is greater than geospatial_lon_max indicate the bounding box extends from geospatial_lon_max, through the longitude range discontinuity meridian (either the antimeridian or Prime Meridian), to geospatial_lon_min. For a more detailed geospatial coverage, see the suggested geospatial attributes.
- geospatial_lon_min
- Describes a simple latitude/longitude bounding box. geospatial_lat_min specifies the southernmost latitude; geospatial_lat_max specifies the northernmost latitude; geospatial_lon_min specifies the westernmost longitude; geospatial_lon_max specifies the easternmost longitude of the bounding box. The values of geospatial_lon_min and geospatial_lon_max reflect the actual longitude data values. Cases where geospatial_lon_min is greater than geospatial_lon_max indicate the bounding box extends from geospatial_lon_max, through the longitude range discontinuity meridian (either the antimeridian or Prime Meridian), to geospatial_lon_min. For a more detailed geospatial coverage, see the suggested geospatial attributes.
- geospatial_lon_max
- Describes a simple latitude/longitude bounding box. geospatial_lat_min specifies the southernmost latitude; geospatial_lat_max specifies the northernmost latitude; geospatial_lon_min specifies the westernmost longitude; geospatial_lon_max specifies the easternmost longitude of the bounding box. The values of geospatial_lon_min and geospatial_lon_max reflect the actual longitude data values. Cases where geospatial_lon_min is greater than geospatial_lon_max indicate the bounding box extends from geospatial_lon_max, through the longitude range discontinuity meridian (either the antimeridian or Prime Meridian), to geospatial_lon_min. For a more detailed geospatial coverage, see the suggested geospatial attributes.
- geospatial_vertical_min
- Describes a simple vertical bounding box. For a more detailed geospatial coverage, see the suggested geospatial attributes.
- geospatial_vertical_max
- Describes a simple vertical bounding box. For a more detailed geospatial coverage, see the suggested geospatial attributes.
- time_coverage_start
- Describes the temporal coverage of the data as a time range.
- time_coverage_end
- Describes the temporal coverage of the data as a time range.
- time_coverage_duration
- Describes the temporal coverage of the data as a time range.
- time_coverage_resolution
- Describes the temporal coverage of the data as a time range.
- standard_name_vocabulary
- The name of the controlled vocabulary from which variable standard names are taken.
- license
- Describe the restrictions to data access and distribution.
Suggested
- contributor_name
- The name and role of any individuals or institutions that contributed to the creation of this data.
- contributor_role
- The name and role of any individuals or institutions that contributed to the creation of this data.
- publisher_name
- The data publisher's name, URL, and email. The publisher may be an individual or an institution.
- publisher_url
- The data publisher's name, URL, and email. The publisher may be an individual or an institution.
- publisher_email
- The data publisher's name, URL, and email. The publisher may be an individual or an institution.
- date_modified
- The date on which this data was last modified.
- date_issued
- The date on which this data was formally issued.
- geospatial_lat_units
- Further refinement of the geospatial bounding box can be provided by using these units and resolution attributes.
- geospatial_lat_resolution
- Further refinement of the geospatial bounding box can be provided by using these units and resolution attributes.
- geospatial_lon_units
- Further refinement of the geospatial bounding box can be provided by using these units and resolution attributes.
- geospatial_lon_resolution
- Further refinement of the geospatial bounding box can be provided by using these units and resolution attributes.
- geospatial_vertical_units
- Further refinement of the geospatial bounding box can be provided by using these units and resolution attributes.
- geospatial_vertical_resolution
- Further refinement of the geospatial bounding box can be provided by using these units and resolution attributes.
- geospatial_vertical_positive
- Further refinement of the geospatial bounding box can be provided by using these units and resolution attributes.
Original Tables (Reference)
Highly Recommended
Attribute | Description | THREDDS | ISO 19115-2 | OGC CSW | Rubric Category |
---|---|---|---|---|---|
title |
A short description of the dataset. |
dataset@name |
/gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:citation/gmd:CI_Citation/gmd:title/gco:CharacterString (M) |
Title | Text Search |
summary |
A paragraph describing the dataset. |
metadata/documentation[@type="summary"] |
/gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:abstract/gco:CharacterString (M) |
Abstract | Text Search |
keywords |
A comma separated list of key words and phrases. |
metadata/keyword |
/gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:descriptiveKeywords/gmd:MD_Keywords/gmd:keyword/gco:CharacterString |
Subject | Text Search |
Recommended
Attribute | Description | THREDDS | ISO 19115-2 | OGC CSW | Rubric Category |
---|---|---|---|---|---|
id |
The
combination of the "naming authority" and the "id" should be a globally unique identifier for the dataset. |
dataset@id |
/gmi:MI_Metadata/gmd:fileIdentifier/gco:CharacterString (O) |
Identifier | Identifier |
naming_authority |
|||||
keywords_vocabulary |
If you are following a guideline for the words/phrases in your "keywords" attribute, put the name of that guideline here. |
metadata/keyword@vocabulary | /gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:descriptiveKeywords/gmd:MD_Keywords/gmd:thesaurusName/gmd:CI_Citation/gmd:title/gco:CharacterString |
Text Search | |
cdm_data_type |
The THREDDS data type appropriate for this dataset. | metadata/dataType | /gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:spatialRepresentationType/gmd:MD_SpatialRepresentationTypeCode May need some extensions to this codelist. Current values: vector, grid, textTable, tin, stereoModel, video. |
Other | |
history |
Provides an audit trail for modifications to the original data. | metadata/documentation[@type="history"] | /gmi:MI_Metadata/gmd:dataQualityInfo/gmd:DQ_DataQuality/gmd:lineage/gmd:LI_Lineage/gmd:statement/gco:CharacterString (O) | Text Search | |
comment |
Miscellaneous information about the data. | metadata/documentation |
/gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:supplementalInformation |
Text Search | |
date_created | The date on which the data was created. |
metadata/date[@type="created"] | /gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:citation/gmd:CI_Citation/gmd:date/gmd:CI_Date/gmd:date/gco:Date (M) /gmd:dateType/gmd:CI_DateTypeCode="creation" |
Responsible Party | |
creator_name |
The data creator's name, URL, and email. The "institution" attribute will be used if the "creator_name" attribute does not exist. |
metadata/creator/name |
/gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:citation/gmd:CI_Citation/gmd:citedResponsibleParty/gmd:CI_ResponsibleParty/gmd:individualName/gco:CharacterString CI_RoleCode="originator" (O) |
Responsible Party | |
creator_url |
metadata/creator/contact@url |
/gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:citation/gmd:CI_Citation/gmd:citedResponsibleParty/gmd:CI_ResponsibleParty/gmd:contactInfo/gmd:CI_Contact/gmd:onlineResource/gmd:CI_OnlineResource/gmd:linkage/gmd:URL |
Responsible Party | ||
creator_email |
metadata/creator/contact@email | /gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:citation/gmd:CI_Citation/gmd:citedResponsibleParty/gmd:CI_ResponsibleParty/gmd:contactInfo/gmd:CI_Contact/gmd:address/gmd:CI_Address/gmd:electronicMailAddress/gco:CharacterString | Responsible Party | ||
institution |
metadata/creator/name | /gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:citation/gmd:CI_Citation/gmd:citedResponsibleParty/gmd:CI_ResponsibleParty/gmd:organisationName/gco:CharacterString | Responsible Party | ||
project |
The scientific project that produced the data. |
metadata/project |
/gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:descriptiveKeywords/gmd:MD_Keywords/gmd:keyword/gco:CharacterString and/or /gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:aggregationInfo/gmd:MD_AggregateInformation/gmd:aggregateDataSetName/gmd:CI_Citation/gmd:title/gco:CharacterString DS_AssociationTypeCode="largerWorkCitation" and DS_InitiativeTypeCode="project" and/or /gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:descriptiveKeywords/gmd:MD_Keywords/gmd:keyword/gco:CharacterString with gmd:MD_KeywordTypeCode="project" |
Responsible Party | |
processing_level | A textual description of the processing (or quality control) level of the data. |
metadata/documentation[@type="processing_level"] | |||
acknowledgement | A place to acknowledge various type of support for the project that produced this data. |
metadata/documentation[@type="funding"] | /gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:credit/gco:CharacterString | Responsible Party | |
geospatial_bounds | Describes geospatial extent using any of the geometric objects (2D or 3D) supported by the Well-Known Text (WKT) format. | BoundingPolygon | Extent | ||
geospatial_lat_min |
Describes a simple latitude/longitude bounding box. geospatial_lat_min specifies the southernmost latitude; geospatial_lat_max specifies the northernmost latitude; geospatial_lon_min specifies the westernmost longitude; geospatial_lon_max specifies the easternmost longitude of the bounding box. The values of geospatial_lon_min and geospatial_lon_max reflect the actual longitude data values. Cases where geospatial_lon_min is greater than geospatial_lon_max indicate the bounding box extends from geospatial_lon_max, through the longitude range discontinuity meridian (either the antimeridian or Prime Meridian), to geospatial_lon_min. For a more detailed geospatial coverage, see the suggested geospatial attributes. |
metadata/geospatialCoverage/northsouth/start |
/gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:extent/gmd:EX_Extent/gmd:geographicElement/gmd:EX_GeographicBoundingBox/gmd:southBoundLatitude/gco:Decimal |
BoundingBox | Extent |
geospatial_lat_max | metadata/geospatialCoverage/northsouth/size | /gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:extent/gmd:EX_Extent/gmd:geographicElement/gmd:EX_GeographicBoundingBox/gmd:northBoundLatitude/gco:Decimal |
BoundingBox | Extent | |
geospatial_lon_min | metadata/geospatialCoverage/eastwest/start | /gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:extent/gmd:EX_Extent/gmd:geographicElement/gmd:EX_GeographicBoundingBox/gmd:westBoundLongitude/gco:Decimal |
BoundingBox | Extent | |
geospatial_lon_max | metadata/geospatialCoverage/eastwest/size | /gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:extent/gmd:EX_Extent/gmd:geographicElement/gmd:EX_GeographicBoundingBox/gmd:eastBoundLongitude/gco:Decimal |
BoundingBox | Extent | |
geospatial_vertical_min |
Describes a simple vertical bounding box. For a more detailed geospatial coverage, see the suggested geospatial attributes. | metadata/geospatialCoverage/updown/start | /gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:extent/gmd:EX_Extent/gmd:verticalElement/gmd:EX_VerticalExtent/gmd:minimumValue/gco:Real | Extent | |
geospatial_vertical_max | metadata/geospatialCoverage/updown/size | /gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:extent/gmd:EX_Extent/gmd:verticalElement/gmd:EX_VerticalExtent/gmd:maximumValue/gco:Real | Extent | ||
time_coverage_start | Describes the temporal coverage of the data as a time range. | metadata/timeCoverage/start | /gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:extent/gmd:EX_Extent/gmd:temporalElement/gmd:EX_TemporalExtent/gmd:extent/gml:TimePeriod/gml:beginPosition | Extent | |
time_coverage_end | metadata/timeCoverage/end | /gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:extent/gmd:EX_Extent/gmd:temporalElement/gmd:EX_TemporalExtent/gmd:extent/gml:TimePeriod/gml:endPosition | Extent | ||
time_coverage_duration | metadata/timeCoverage/duration | /gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:extent/gmd:EX_Extent/gmd:temporalElement/gmd:EX_TemporalExtent/gmd:extent/gml:TimePeriod/gml:beginPosition provides an ISO8601 compliant description of the time period covered by the dataset. This standard supports descriptions of durations. | Extent | ||
time_coverage_resolution | metadata/timeCoverage/resolution | Extent | |||
standard_name_vocabulary |
The name of the controlled vocabulary from which variable standard names are taken. |
metadata/variables@vocabulary | /gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:descriptiveKeywords/gmd:MD_Keywords/gmd:thesaurusName/gmd:CI_Citation/gmd:title/gco:CharacterString |
Text Search | |
license | Describe the restrictions to data access and distribution. | metadata/documentation[@type="rights"] | /gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:resourceConstraints/gmd:MD_LegalConstraints/gmd:useLimitation/gco:CharacterString |
Suggested
Attribute | Description | THREDDS | ISO 19115-2 | OGC CSW | Rubric Category |
---|---|---|---|---|---|
contributor_name |
The name and role of any individuals or institutions that contributed to the creation of this data. |
metadata/contributor |
/gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:citation/gmd:CI_Citation/gmd:citedResponsibleParty/gmd:CI_ResponsibleParty/gmd:individualName/gco:CharacterString |
Responsible Party | |
contributor_role |
metadata/contributor@role | /gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:citation/gmd:CI_Citation/gmd:citedResponsibleParty/gmd:CI_ResponsibleParty/gmd:role/gmd:CI_RoleCode ="principalInvestigator" | "author" |
Responsible Party | ||
publisher_name |
The data publisher's name, URL, and email. The publisher may be an individual or an institution. | metadata/publisher/name |
/gmi:MI_Metadata/gmd:distributionInfo/gmd:MD_Distribution/gmd:distributor/gmd:MD_Distributor/gmd:distributorContact/gmd:CI_ResponsibleParty/gmd:organisationName/gco:CharacterString and/or /gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:citation/gmd:CI_Citation/gmd:citedResponsibleParty/gmd:CI_ResponsibleParty/gmd:individualName/gco:CharacterString CI_RoleCode="publisher" and/or /gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:descriptiveKeywords/gmd:MD_Keywords/gmd:keyword/gco:CharacterString with gmd:MD_KeywordTypeCode="dataCenter" |
Responsible Party | |
publisher_url |
metadata/publisher/contact@url |
/gmi:MI_Metadata/gmd:distributionInfo/gmd:MD_Distribution/gmd:distributor/gmd:MD_Distributor/gmd:distributorContact/gmd:CI_ResponsibleParty/gmd:contactInfo/gmd:CI_Contact/gmd:onlineResource/gmd:CI_OnlineResource/gmd:linkage/gmd:URL and/or /gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:citation/gmd:CI_Citation/gmd:citedResponsibleParty/gmd:CI_ResponsibleParty/gmd:contactInfo/gmd:CI_Contact/gmd:onlineResource/gmd:CI_OnlineResource/gmd:linkage/gmd:URL CI_RoleCode="publisher" |
Responsible Party | ||
publisher_email |
metadata/publisher/contact@email | /gmi:MI_Metadata/gmd:distributionInfo/gmd:MD_Distribution/gmd:distributor/gmd:MD_Distributor/gmd:distributorContact/gmd:CI_ResponsibleParty/gmd:contactInfo/gmd:CI_Contact/gmd:address/gmd:CI_Address/gmd:electronicMailAddress/gco:CharacterString and/or /gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:citation/gmd:CI_Citation/gmd:citedResponsibleParty/gmd:CI_ResponsibleParty/gmd:contactInfo/gmd:CI_Contact/gmd:address/gmd:CI_Address/gmd:electronicMailAddress/gco:CharacterString CI_RoleCode="publisher" |
Responsible Party | ||
date_modified |
The date on which this data was last modified. |
metadata/date[@type="modified"] | /gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:citation/gmd:CI_Citation/gmd:date/gmd:CI_Date/gmd:date/gco:Date /gmd:dateType/gmd:CI_DateTypeCode="revision" |
Modified | Responsible Party |
date_issued |
The date on which this data was formally issued. |
metadata/date[@type="issued"] | /gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:citation/gmd:CI_Citation/gmd:date/gmd:CI_Date/gmd:date/gco:Date /gmd:dateType/gmd:CI_DateTypeCode="publication" |
Responsible Party | |
geospatial_lat_units |
Further refinement of the geospatial bounding box can be provided by using these units and resolution attributes. |
metadata/geospatialCoverage/northsouth/units | /gmi:MI_Metadata/gmd:spatialRepresentationInfo/gmd:MD_Georectified/gmd:axisDimensionProperties/gmd:MD_Dimension/gmd:resolution/gco:Measure/@uom | Extent | |
geospatial_lat_resolution | metadata/geospatialCoverage/northsouth/resolution | /gmi:MI_Metadata/gmd:spatialRepresentationInfo/gmd:MD_Georectified/gmd:axisDimensionProperties/gmd:MD_Dimension/gmd:resolution/gco:Measure | Extent | ||
geospatial_lon_units |
metadata/geospatialCoverage/eastwest/units | /gmi:MI_Metadata/gmd:spatialRepresentationInfo/gmd:MD_Georectified/gmd:axisDimensionProperties/gmd:MD_Dimension/gmd:resolution/gco:Measure/@uom | Extent | ||
geospatial_lon_resolution | metadata/geospatialCoverage/eastwest/resolution | /gmi:MI_Metadata/gmd:spatialRepresentationInfo/gmd:MD_Georectified/gmd:axisDimensionProperties/gmd:MD_Dimension/gmd:resolution/gco:Measure | Extent | ||
geospatial_vertical_units |
metadata/geospatialCoverage/updown/units | /gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:extent/gmd:EX_Extent/gmd:verticalElement/gmd:EX_VerticalExtent/gmd:verticalCRS | Extent | ||
geospatial_vertical_resolution |
metadata/geospatialCoverage/updown/resolution |
Extent | |||
geospatial_vertical_positive |
metadata/geospatialCoverage@zpositive |
Extent |
Highly Recommended Variable Attributes
Attribute | Description | THREDDS | ISO 19115-2 |
---|---|---|---|
long_name | A long descriptive name for the variable (not necessarily from a controlled vocabulary). | metadata/variables/variable@vocabulary_name | At present the ISO 19115-2 Standard supports only one name for a variable. Standard names can be provided as keywords with the appropriate thesaurus. |
standard_name |
A long descriptive name for the variable taken from a controlled vocabulary of variable names. | metadata/variables/variable@vocabulary_name | |
units | The units of the variables data values. This attributes value should be a valid udunits string. | metadata/variables/variable@units | /gmi:MI_Metadata/gmd:contentInfo/gmi:MI_CoverageDescription/gmd:dimension/gmd:MD_Band/gmd:units |
coverage_content_type | An ISO 19115-1 code to indicate the source of the data. | The valid values in the MD_CoverageContentTypeCode list are image, thematicClassification, physicalMeasurement, auxiliaryInformation, qualityInformation, referenceInformation, modelResult, coordinate |
ISO Translation Notes
The translation between the Attribute Conventions for Data Discovery is subject to a number of assumptions or conventions described here.
People
The ACDD includes several types of people:
ACDD Attributes | ISO Locations |
creator_name, creator_email, creator_url, institution | citation/citedResponsibleParty role=originator, point of contact, and metadata contact |
contributor_name, contributor_role | citation/citedResponsibleParty role=originator (may need adjustment) |
publisher_name, publisher_email, publisher_url | distributor and Data Center keyword |
project | Project keyword, aggregation information (initiative type = project) |
Keywords
The ACDD includes several attributes that make sense as keywords in ISO:
ACDD Attributes | ISO Locations |
keywords | theme keywords with thesaurus given by the keywords_vocabulary attribute |
project | Project keyword with unknown thesaurus and aggregation information (initiative type = project) |
publisher_name | Data Center keyword with unknown thesaurus |
standard_names for parameters | theme keywords with thesaurus = standard_name_vocabulary |
publisher_name, publisher_email, publisher_url | distributor and Data Center keyword |
Translation Revisions
Several changes were introduced into Version 2.0.2 of the stylesheet for transforming NcML to ISO in order to improve the rubric score for the resulting ISO metadata. The changes included:
- Including netcdf/@location in transform as distribution onlineResource
- Added tagname to writeResponsibleParty so that responsibleParties with
different UML roles could be supported (i.e. contact vs. distributor)
- Added urlName and urlDescription to writeResponsibleParty to add
content to the onlineResource
- Moved publisher from citation to distributor and included publisher_name as a dataCenter keyword.
- Added project as a keyword with type=project
- Added distributionInfo section to ISO if publisher or location exist.
Determining an Order of Precedence
There can be conflicting information available from different sources within the THREDDS and CDM data models. The diagram below seeks to determine an order of precedence for what is recorded in the ncISO metadata when those attributes conflict.
A key part of this discussion is the ability to see identify potentially conflicting metdata between the differenc sources within THREDDS and NetCDF. Below we propose using groups to identify in the NCML what sources contain the relevant metadata that will be used in the ISO translation.
<?xml version="1.0" encoding="UTF-8"?> <netcdf xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2 ../XSD/ncml-2.2.xsd" xmlns="http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2" location="http://localhost:8080/thredds/dodsC/test/crm_v1.nc"> <!-- Metadata from the netCDF or NCML file global attributes --> <attribute name="Conventions" value="CF-1.4" /> <attribute name="title" value="crm_v1.grd" /> <attribute name="history" value="xyz2grd -R-80/-64/40/48 -I3c -Gcrm_v1.grd" /> <attribute name="GMT_version" value="4.5.1 [64-bit]" /> <attribute name="creator_name" value="David Neufeld"/> <attribute name="creator_email" value="David.Neufeld@noaa.gov"/> <attribute name="geospatial_lon_units" value="degrees_east" /> <attribute name="geospatial_lat_units" value="degrees_north" /> <attribute name="geospatial_lon_min" type="float" value="-80.0" /> <attribute name="geospatial_lon_max" type="float" value="-64.0" /> <attribute name="geospatial_lat_max" type="float" value="48.0" /> <attribute name="geospatial_lat_min" type="float" value="40.0" /> <attribute name="geospatial_lon_resolution" type="double" value="8.33E-4" /> <attribute name="geospatial_lat_resolution" type="double" value="8.33E-4" /> <!-- Metadata calculated from the netCDF file axes based on CF conventions --> <group name="CFMetadata"> <attribute name="geospatial_lon_min" value="-80.0" type="float" /> <attribute name="geospatial_lat_min" value="40.0" type="float" /> <attribute name="geospatial_lon_max" value="-64.0" type="float" /> <attribute name="geospatial_lat_max" value="48.0" type="float" /> <attribute name="geospatial_lon_units" value="degrees_east" /> <attribute name="geospatial_lat_units" value="degrees_north" /> <attribute name="geospatial_lon_resolution" value="8.332899328159992E-4" /> <attribute name="geospatial_lat_resolution" value="8.332465368190813E-4" /> </group> <!-- Metadata from the THREDDS catalog dataset --> <group name="THREDDSMetadata"> <attribute name="id" value="crm_v1" /> <attribute name="creator_name" value="David Neufeld"/> <attribute name="creator_email" value="David.Neufeld@noaa.gov"/> <attribute name="data_distribution" value="http://localhost:8080/thredds/dodsC/test/crm_v1.nc" /> <attribute name="wms_service" value="http://localhost:8080//thredds/wms/crm/crm_vol9.nc" /> <attribute name="wcs_service" value="http://localhost:8080//thredds/wcs/crm/crm_vol9.nc" /> </group> <!-- Metadata from the ncISO service --> <group name="NCISOMetadata"> <attribute name="metadata_creation" value="2011-04-19" /> </group> <dimension name="x" length="19201" /> <dimension name="y" length="9601" /> <variable name="z" shape="y x" type="float"> <attribute name="long_name" value="z" /> <attribute name="_FillValue" type="float" value="NaN" /> <attribute name="actual_range" type="double" value="-2754.39990234375 1903.0" /> <attribute name="units" value="meters" /> <attribute name="positive" value="up" /> </variable> <variable name="x" shape="x" type="double"> <attribute name="long_name" value="x" /> <attribute name="actual_range" type="double" value="-80.0 -64.0" /> <attribute name="units" value="degrees_east" /> <attribute name="_CoordinateAxisType" value="Lon" /> </variable> <variable name="y" shape="y" type="double"> <attribute name="long_name" value="y" /> <attribute name="actual_range" type="double" value="40.0 48.0" /> <attribute name="units" value="degrees_north" /> <attribute name="_CoordinateAxisType" value="Lat" /> </variable> </netcdf>