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Earth Science Data and Information Systems (ESDIS) Project, Code 423

 

 

Unified Metadata Model - Common (UMM-Common)

 


Unified Metadata Model Common (UMM-Common)

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Prepared by:

 

 

 

 

 

 

 

Name

 

Date

Title/Role

 

 

Organization

 

 

 

 

 

Reviewed by:

 

 

 

 

 

 

 

Name

 

Date

Title/Role

 

 

Organization

 

 

 

 

 

Approved by:

 

 

 

 

 

 

 

Name

 

Date

Title/Role

 

 

Organization

 

 

 

 

 

Concurred by:

 

 

 

 

 

 

 

Name

 

Date

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Organization

 

 

 

[Electronic] Signatures available in B32 Room E148

online at: / https://ops1-cm.ems.eosdis.nasa.gov/cm2/


Preface

This document is under ESDIS Project configuration control.  Once this document is approved, ESDIS approved changes are handled in accordance with Class I and Class II change control requirements described in the ESDIS Configuration Management Procedures, and changes to this document shall be made by change bars or by complete revision.

 

Any questions should be addressed to: esdis-esmo-cmo@lists.nasa.gov

ESDIS Configuration Management Office (CMO)
NASA/GSFC

Code 423

Greenbelt, Md.  20771


Abstract

Originally there was an effort to harmonize a list of standards and specifications that was in use by the National Aeronautics and Space Administration (NASA) Earth Science community.  These specifications included the Directory Interchange Format (DIF), Earth Observing System (EOS) Clearing House (ECHO) 10, and International Organization for Standardization (ISO) 19115-2.  The result of the harmonization effort was the Unified Metadata Model (UMM).  This document - the UMM-Common document - describes the compilation of elements that are shared among the UMM profiles which include: collections, granules, services, visualizations, variables, and documents.  Implementers of Earth Science Data and Information System's (ESDIS) Common Metadata Repository (CMR), its clients, and data providers should reference this document and the UMM as a guide while implementing the system, its clients, or generating metadata.  Links to more information about the standards and specifications used in this document can be found in the introduction's related document section.

 

Keywords: UMM-Common, UMM-C, UMM-G, UMM-Var, UMM-Vis, UMM-S, Collections, Granules, Services, Visualization, Variables, NASA, Earthdata Search, Tools, EOSDIS, ESDIS, CMR, GCMD

Change History Log

 

Revision

Effective Date

Description of Changes

(Reference the CCR & CCB Approval Date)

 

 

CCR 423-ESDIS-XXX; CCB Approved

Pages:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


Table of Contents

1 Introduction

1.1 Purpose

1.2 Scope

1.3 Related Documentation

1.3.1 Applicable Documents

1.3.2 Reference Documents

1.4 Impact

1.5 Copyright Notice

1.6 Feedback

1.7 Document Conventions

2 Common Elements

2.1 Related URL

2.2 Online Resource

2.3 Use Constraints

2.4 Access Constraints

2.5 Science Keywords

Appendix A Abbreviations and Acronyms

List of Tables

Table 1.  Cardinality

 

 


 

1           Introduction

Earth Observing System (EOS) Data and Information System (EOSDIS) generates, archives, and distributes enormous amounts of Earth Science data, which in turn are made available to the science community and the public at large.  To aid in the search and discovery process, these data must be organized and cataloged.  Accurate, complete, and consistent metadata are required for efficient accessibility.  To improve the quality and consistency among its metadata holdings, EOSDIS has developed a model describing metadata that it archives and maintains.  This model documents elements that may be represented across various metadata standards and unifies them through core elements useful for discovery.  This unified model, aptly named the Unified Metadata Model (UMM), was developed as part of the EOSDIS Metadata Architecture Studies (MAS) I and II conducted between 2012 and 2013.  The UMM will be used by the CMR and will drive search and retrieval of metadata cataloged within that system.

 

This document describes common elements used in various UMM reference profiles, which include: collections, granules, services, visualizations, variables, and documents.

 

1.1          Purpose

This document provides information to the NASA Earth Science community.  Distribution is unlimited.

 

1.2          Scope

This document is a supplemental document to the Collection Metadata Model.  It holds common elements that are shared between the other metadata models.

 

1.3          Related Documentation

The latest versions of all documents below should be used.  The latest ESDIS Project documents can be obtained from Universal Resource Locator (URL): https://ops1-cm.ems.eosdis.nasa.gov .  ESDIS documents have a document number starting with either 423 or 505.  Other documents are available for reference in the ESDIS project library website at: http://esdisfmp01.gsfc.nasa.gov/esdis_lib/default.php unless indicated otherwise.

 

1.3.1         Applicable Documents

The following documents are referenced within or are directly applicable, or contain policies or other directive matters that are binding upon the content of this document.

 

N/A

CMR Life Cycle

https://wiki.earthdata.nasa.gov/display/CMR/CMR+Documents

N/A

DIF 9

https://gcmd.nasa.gov/Aboutus/xml/dif/dif.xsd

https://gcmd.nasa.gov/add/difguide/index.html

N/A

DIF 10

https://gcmd.gsfc.nasa.gov/Aboutus/xml/dif/dif_v10.2.xsd

https://gcmd.gsfc.nasa.gov/DocumentBuilder/defaultDif10/guide/

index.html

N/A

ECHO 10

https://wiki.earthdata.nasa.gov/display/echo/Earth+Observing+

System+Clearing+House+-+ECHO

https://cdn.earthdata.nasa.gov/echo/

N/A

ISO 19115-2 (MENDS)

http://www.iso.org/iso/catalogue_detail.htm?csnumber=39229

https://cdn.earthdata.nasa.gov/iso/

 

1.3.2         Reference Documents

The following documents are not binding on the content but referenced herein and, amplify or clarify the information presented in this document.

 

N/A

Tag

http://en.wikipedia.org/wiki/Tag_%28metadata%29

N/A

XPath ( https://en.wikipedia.org/wiki/XPath ) is a language for addressing parts of an XML document, designed for use with XSLT.

N/A

MENDS

More information on the Base Metadata Requirements established by the MENDS group: https://wiki.earthdata.nasa.gov/display/NASAISO/NASA+Base+Metadata+Requirements

 

1.4          Impact

This document outlines common elements used in the Unified Metadata Model that are intended to be backward-compatible with existing NASA earth science metadata implementations.  It will impact providers from NASA Distributed Active Archive Centers (DAAC[s]), CMR client developers, metadata catalog developers, and users.

 

1.5          Copyright Notice

The contents of this document are not protected by copyright in the United States and may be used without obtaining permission from NASA.

1.6          Feedback

Questions, comments and recommendations on the contents of this document should be directed to support@earthdata.nasa.gov.

 

1.7          Document Conventions

This document contains UMM common elements.  These elements are used by the other UMM models and reference the element definitions defined in this document.  The element definitions can contain the following components:

  • Element Name: Provides the element name.
  • Element Specification: Provides the sub-elements, cardinality of the sub-elements within (), any valid values within <>, applicable comments and notes within {}, and any other major factors that make up the element.
  • Description: Provides background information on the purpose of the element and its intended use.  Furthermore, any information about the element's current usage, recommendations for usage, or unresolved issues is also documented here.  The term "resource" is also used mainly in the description section though it can be used elsewhere and it is meant to denote collections, granules, services, visualizations, variables, documents, etc.
  • Profile Utilization: Lists which profiles use the specific element.
  • Cardinality: Indicates the expectation of counts for this element, summarized in Table 1.
  • Analysis: Gives an analysis of this element where needed.
  • Mapping: Gives Extensible Markup Language (XML) Path Language (XPath) mappings for this element to the elements in other specifications.  This can be considered as the "crosswalk" for this element.  For a link to more information about XPaths please see the introduction's reference documents section.
  • Examples: XML snippets from "cross-walked" data standards documenting sample values for the element.  Whenever possible, a Uniform Resource Locator (URL) to the specific collection or service used for the metadata snippet, is provided.

 

With the exception of Element Name, each of the element's sections that are included are listed in bold to make it easier for the reader to distinguish between the element's section headings and the descriptions.

 

Table 1 below shows values and descriptions of numbers of elements.

Table 1 .  Cardinality

Value

Description

1

Exactly one of this element is required

0..N

This element is optional; up to and including N number of this element may be present

0..*

Optionally, many of this element may be present

1..*

At least one of this element is required, many may be present

 

2          
Common Elements

The following subsections describe each of the metadata elements that are common among the various UMM profiles.

 

2.1          Related URL

Element Specification

RelatedURL (0..*)

RelatedURL/URL (1)

RelatedURL/Description (0..1)

RelatedURL/URLContentType (1) <CollectionURL, PublicationURL, DataCenterURL, DistributionURL, DataContactURL, VisualizationURL>

RelatedURL/Type (1) {Valid values shown below}

RelatedURL/Subtype (0..1) {Valid values shown below}

RelatedURL/GetData (0..1)

RelatedURL/GetData/Format (1) <ascii, binary, GRIB, BUFR, HDF4, HDF5, HDF-EOS4, HDF-EOS5, jpeg, png, tiff, geotiff, kml, Not provided>

RelatedURL/GetData/MimeType (0..1) {Valid values shown below}

RelatedURL/GetData/Size (1)

RelatedURL/GetData/Unit (1) <KB, MB, GB, TB, PB>

RelatedURL/GetData/Fees (0..1)

RelatedURL/GetData/Checksum (0..1)

RelatedURL/GetService (0..1)

RelatedURL/GetService/Format (0..1) <ascii, binary, GRIB, BUFR, HDF4, HDF5, HDF-EOS4, HDF-EOS5, jpeg, png, tiff, geotiff, kml, Not provided>

RelatedURL/GetService/MimeType (1) {Valid values shown below}

RelatedURL/GetService/Protocol (1) <ESI, FTP, FTPS, HTTP, HTTPS, OPeNDAP, WCS, WMS, Not provided>

RelatedURL/GetService/FullName (1)

RelatedURL/GetService/DataID (1)

RelatedURL/GetService/DataType (1)

RelatedURL/GetService/URI (0..*)

 

Valid Values for

  • URLContentType
    • Type
      • Subtype

 

  • DistributionURL
    • DOWNLOAD SOFTWARE
      •  
      • MOBILE APP
    • GET DATA
      •  
      • APPEARS
      • DATA COLLECTION BUNDLE
      • DATA TREE
      • DATACAST URL
      • DIRECT DOWNLOAD
      • Earthdata Search
      • EOSDIS DATA POOL
      • GIOVANNI
      • GoLIVE Portal
      • IceBridge Portal
      • LAADS
      • LANCE
      • MIRADOR
      • MODAPS
      • NOAA CLASS
      • NOMADS
      • Order
      • PORTAL
      • Subscribe
      • USGS EARTH EXPLORER
      • VERTEX
      • VIRTUAL COLLECTION
    • GOTO WEB TOOL
      •  
      • LIVE ACCESS SERVER (LAS)
      • MAP VIEWER
      • SIMPLE SUBSET WIZARD (SSW)
      • SUBSETTER
    • USE SERVICE API
      •  
      • GRADS DATA SERVER (GDS)
      • MAP SERVICE
      • OPENDAP DATA
      • OpenSearch
      • SERVICE CHAINING
      • TABULAR DATA STREAM (TDS)
      • THREDDS DATA
      • WEB COVERAGE SERVICE (WCS)
      • WEB FEATURE SERVICE (WFS)
      • WEB MAP SERVICE (WMS)
      • WEB MAP TILE SERVICE (WMTS)
  • VisualizationURL
    • GET RELATED VISUALIZATION
      •  
      • WORLDVIEW
      • GIOVANNI
      • MAP
  • CollectionURL
    • DATA SET LANDING PAGE
      •  
    • EXTENDED METADATA
      •  
    • PROFESSIONAL HOME PAGE
      •  
    • PROJECT HOME PAGE
      •  
  • PublicationURL
    • VIEW RELATED INFORMATION
      •  
      • ALGORITHM DOCUMENTATION
      • ALGORITHM THEORETICAL BASIS DOCUMENT (ATBD)
      • ANOMALIES
      • CASE STUDY
      • DATA CITATION POLICY
      • DATA QUALITY
      • DATA RECIPE
      • DELIVERABLES CHECKLIST
      • GENERAL DOCUMENTATION
      • HOW-TO
      • IMPORTANT NOTICE
      • INSTRUMENT/SENSOR CALIBRATION DOCUMENTATION
      • MICRO ARTICLE
      • PI DOCUMENTATION
      • PROCESSING HISTORY
      • PRODUCT HISTORY
      • PRODUCT QUALITY ASSESSMENT
      • PRODUCT USAGE
      • PRODUCTION HISTORY
      • PUBLICATIONS
      • READ-ME
      • REQUIREMENTS AND DESIGN
      • SCIENCE DATA PRODUCT SOFTWARE DOCUMENTATION
      • SCIENCE DATA PRODUCT VALIDATION
      • USER FEEDBACK PAGE
      • USER'S GUIDE
  • DataCenterURL
    • HOME PAGE
      •  
  • DataContactURL
    • HOME PAGE
      •  

 

 

 

Valid values for RelatedURL/GetService/MimeType:

  • application/json
  • application/xml
  • application/x-netcdf
  • application/gml+xml
  • application/vnd.google-earch.kml+xml
  • image/gif
  • image/tiff
  • image/bmp
  • text/csv
  • text/xml
  • application/pdf
  • application/x-hdf
  • application/xhdf5
  • application/octet-stream
  • application/vnd.google-earth.kmz
  • image/jpeg
  • image/png
  • image/vnd.collada+xml
  • text/html
  • text/plain

 

Description

This element describes any resource-related URLs that include project home pages, resource information pages, services, related data, archives/servers, metadata extensions, direct links to online software packages, web mapping services, links to images, documents, or other data.  When filling out this element URLContentType and Type are required - Description and Subtype are optional.  If the URLContentType is "DistributionURL" and the Type is "GET DATA", "DOWNLOAD SOFTWARE", or "GOTO WEB TOOL", then the RelatedURL/GetData sub-elements are also filled out.  If the URLContentType is "DistributionURL" and the Type is "USE SERVICE API", then the RelatedURL/GetService sub-elements are also filled out.

 

•    RelatedURL - contains URLs to data or services (e.g.  Distribution URLs).

•    GetData - information about the data (e.g.  format, size, units, fees, checksum).

•    GetService - contains Universal Resource Identifiers (URI)s to data via services and information about the data and service (e.g.  mime type, protocol, name, data IDs, data type).

 

Some use Examples:

I have a DAAC Home page that I would like to put into the metadata:

RelatedURL/URL = http://www.daachomepage.gov

RelatedURL/Description = The DAAC home page

RelatedURL/URLContentType = DataCenterURL

RelatedURL/Type = HOME PAGE

RelatedURL/Subtype =

 

I have a file that I can distribute to whomever is interested:

RelatedURL/URL = http://www.daachomepage.gov/path/downloadable.doc

RelatedURL/Description = some downloadable resource

RelatedURL/URLContentType = DistributionURL

RelatedURL/Type = GET DATA

RelatedURL/Subtype = DATA TREE
RelatedURL/GetData/Format = application/msword

RelatedURL/GetData/Size = 40

RelatedURL/GetData/Unit = MB

RelatedURL/GetData/Fees = 0

RelatedURL/GetData/Checksum = f5d30a4f2

 

Profile Utilization

Collection

 

Cardinality

0..*

 

Mapping

DIF 9:

/DIF/Related_URL

/DIF/Multimedia_Sample

/DIF/Distribution

 

DIF 10:

/DIF/Related_URL

/DIF/Multimedia_Sample

/DIF/Distribution

 

ECHO 10 Collection:

/Collection/OnlineAccessURLs/OnlineAccessURL

/Collection/AssociatedBrowseImageUrls

/Collection/OnlineResources

/Collection/Price

/Collection/DataFormat

 

ISO 19115-2:

/gmi:MI_Metadata/gmd:distributionInfo/gmd:MD_Distribution/gmd:distributor/gmd:MD_Distributor/gmd:distributorTransferOptions/gmd:MD_DigitalTransferOptions/gmd:onLine/gmd:CI_OnlineResource

and/or

/gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:graphicOverview/gmd:MD_BrowseGraphic/gmd:fileName/gmx:FileName src=

 

Examples

DIF 9:

   <Related_URL>

      <URL_Content_Type uuid="6e72d128-7d28-4bd0-bac0-8c5ffd8b31f1">

     <Type>VIEW PROJECT HOME PAGE</Type>

      </URL_Content_Type>

      <URL>http://www.waisdivide.unh.edu/</URL>

   </Related_URL>

   <Related_URL>

      <URL_Content_Type uuid="5ec1bb9d-0efc-4099-9b31-ec791bbd8145">

     <Type>VIEW RELATED INFORMATION</Type>

      </URL_Content_Type>

      <URL>http://www.homepage.montana.edu/~lkbonney/</URL>

      <Description>

         Website for the Priscu Research Group

      </Description>

   </Related_URL>

 

<Multimedia_Sample>

   <URL>http://www.waisdivide.unh.edu/images/sitemap1_large.jpg</URL>/p>

   </Multimedia_Sample>

 

DIF 10:

    <Multimedia_Sample>
        <URL>http://disc.gsfc.nasa.gov/AIRS/images/G1932015.04.19allL1CBrightnessTemperature_K_at10.9microns_map.png</URL>
        <Format>PNG</Format>
        <Caption>The BT derived from an AIRS Level 1C granule for a channel at 10.9 microns.</Caption>
        <Description>Sample image of an AIRICRAD channel converted to brighness temperature</Description>
    </Multimedia_Sample>

    <Related_URL>
        <URL_Content_Type>
            <Type>GET DATA</Type>
            <Subtype>DATA TREE</Subtype>
        </URL_Content_Type>
        <URL>http://airsl1.gesdisc.eosdis.nasa.gov/data/Aqua_AIRS_Level1/AIRICRAD.006/</URL>
        <Description>Access the data via HTTP.</Description>
    </Related_URL>
    <Related_URL>
        <URL_Content_Type>
            <Type>GET DATA</Type>
            <Subtype>MIRADOR</Subtype>
        </URL_Content_Type>
        <URL>http://mirador.gsfc.nasa.gov/cgi-bin/mirador/homepageAlt.pl?keyword=AIRICRAD</URL>
        <Description>Mirador is a data search interface that allows searching, browsing, and retrieving of Earth science data archived at NASA GES DISC.</Description>
    </Related_URL>
    <Related_URL>
        <URL_Content_Type>
            <Type>GET DATA</Type>
        </URL_Content_Type>
        <URL>http://airsl1.gesdisc.eosdis.nasa.gov/opendap/Aqua_AIRS_Level1/AIRICRAD.006/contents.html</URL>
        <Description>Access the data via the OPeNDAP protocol.</Description>
    </Related_URL>
...
    <Related_URL>
        <URL_Content_Type>
            <Type>GET DATA</Type>
            <Subtype>EARTHDATA SEARCH</Subtype>
        </URL_Content_Type>
        <URL>https://search.earthdata.nasa.gov/search?q=AIRICRAD+006</URL>
        <Description>Use the Earthdata Search Client (EDSC) to find and retrieve data sets across multiple data centers.</Description>
    </Related_URL>
...

 

ECHO 10 Collection:

<OnlineAccessURLs>

   <OnlineAccessURL>

      <URL>http://sedac.ciesin.columbia.edu/data/set/ulandsat-cities-from-space/data-download</URL>

      <URLDescription>data download page</URLDescription>

   </OnlineAccessURL>

</OnlineAccessURLs>

<OnlineResources>

   <OnlineResource>

      <URL>http://dx.doi.org/10.7927/H4SQ8XB1</URL>

      <Description>data set DOI and homepage</Description>

      <Type>DOI URL</Type>

   </OnlineResource>

</OnlineResources>

 

<AssociatedBrowseImageUrls>

    <ProviderBrowseUrl>

        <URL>http://sedac.ciesin.columbia.edu/data/set/ulandsat-cities-from-space/maps</URL>

    </ProviderBrowseUrl>

</AssociatedBrowseImageUrls>

 

ISO 19115-2:

<gmd:onLine>

      <gmd:CI_OnlineResource>

         <gmd:linkage>

            <gmd:URL>http://sedac.ciesin.columbia.edu/data/set/ulandsat-cities-from-space/data-download</gmd:URL>

         </gmd:linkage>

         <gmd:applicationProfile gco:nilReason="missing"/>

         <gmd:description>

            <gco:CharacterString>data download page</gco:CharacterString>

         </gmd:description>

         <gmd:function>

            <gmd:CI_OnLineFunctionCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_OnLineFunctionCode" codeListValue="download">download</gmd:CI_OnLineFunctionCode>

         </gmd:function>

      </gmd:CI_OnlineResource>

   </gmd:onLine>

   <gmd:onLine>

      <gmd:CI_OnlineResource>

         <gmd:linkage>

            <gmd:URL>http://dx.doi.org/10.7927/H4SQ8XB1</gmd:URL>

         </gmd:linkage>

         <gmd:applicationProfile gco:nilReason="missing"/>

         <gmd:name>

            <gco:CharacterString>DOI URL</gco:CharacterString>

         </gmd:name>

         <gmd:description>

            <gco:CharacterString>data set DOI and homepage</gco:CharacterString>

         </gmd:description>

         <gmd:function>

            <gmd:CI_OnLineFunctionCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_OnLineFunctionCode" codeListValue=""/>

         </gmd:function>

      </gmd:CI_OnlineResource>

   </gmd:onLine>

...

<gmd:graphicOverview>

  <gmd:MD_BrowseGraphic>

     <gmd:fileName>

        <gmx:FileName src="http://sedac.ciesin.columbia.edu/data/set/ulandsat-cities-from-space/maps"/>

     </gmd:fileName>

     <gmd:fileDescription>

        <gco:CharacterString>File Size:</gco:CharacterString>

     </gmd:fileDescription>

     <gmd:fileType gco:nilReason="missing"/>

  </gmd:MD_BrowseGraphic>

 

2.2          Online Resource

Element Specification

OnlineResource/ (0..1)

OnlineResource/Linkage (1)

OnlineResource/Protocol (0..1)

OnlineResource/ApplicationProfile (0..1)

OnlineResource/Name (0..1)

OnlineResource/Description (0..1)

OnlineResource/Function (0..1)

OnlineResource/MimeType (0..1) {Look at RelatedURL MimeType values}

 

Description

This element describes any online resource which includes citations, publications or references.  This element is analogous to CI_Online_Resource from EN ISO 19115-1:2014 Geographic Information – Metadata – Part 1: Fundamentals.  This element is not a base element but will be included as a sub-element of resource citation and publication reference.  Any mapping to the OnlineResource sub-element will be accomplished through the main element, therefore the mapping section is omitted.

 

2.3          Use Constraints

Element Specification

UseConstraints

 

Description

The UseConstraints element is designed to protect privacy and/or intellectual property by allowing the author to specify how the visualization may or may not be used after access is granted.  This includes any special restrictions, legal prerequisites, terms and conditions, and/or limitations on using the item.  Providers may request acknowledgement of the item from users and claim no responsibility for quality and completeness.  UseConstraints describes how the item may be used once access has been granted; and is distinct from AccessConstraints, which refers to any constraints in accessing the item.

 

Profile Utilization

Visualization

 

Cardinality

0..1

 

Analysis

This element's value is an uncontrolled block of text describing the use constraint.

 

Mapping

DIF 9:

/DIF/Use_Constraints

 

DIF 10:

/DIF/Use_Constraints

 

ISO 19115-2:

/gmd:MD_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:resourceConstraints/gmd:MD_LegalConstraints/gmd:useLimitation/gco:CharacterString

 

Examples

DIF 9:

<Use_Constraints>This data set conforms to the PICCCBY Attribution License
(http://creativecommons.org/licenses/by/3.0/).

Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=ASAC_2201_HCL_0.5 when using these data.</Use_Constraints>

 

DIF 10:

<Use_Constraints>The distribution of this data set is funded by NASA's Earth Science Enterprise (ESE).  The data are not copyrighted; however, we request that when you publish data or results using these data, please acknowledge as follows:
                                               
The data used in this study were acquired as part of the Tropical Rainfall Measuring Mission (TRMM).  The algorithms were developed by the TRMM Science Team.  The data were processed by the TRMM Science Data and Information System (TSDIS) and the TRMM Office; they are archived and distributed by the Goddard Earth Sciences Data and Information Services Center.  TRMM is an international project jointly sponsored by the Japan National Space Development Agency (NASDA) and the U.S.  National Aeronautics and Space Administration (NASA) Office of Earth Sciences.
                                               
Please send a copy of your publication to Help Desk, Goddard Earth Sciences Data and Information Services Center, Code 610.2, NASA GSFC, Greenbelt, MD 20771 or email the reference of your publication to gsfc-help-disc@lists.nasa.gov.</Use_Constraints>

 

ISO 19115-2:

      <gmd:resourceConstraints>
        <gmd:MD_LegalConstraints>
          <gmd:useLimitation>
            <gco:CharacterString>The distribution of this data set is funded by NASA's Earth Science Enterprise (ESE).  The data are not copyrighted; however, we request that when you publish data or results using these data, please acknowledge as follows:

The data used in this study were acquired as part of the Tropical Rainfall Measuring Mission (TRMM).  The algorithms were developed by the TRMM Science Team.  The data were processed by the TRMM Science Data and Information System (TSDIS) and the TRMM Office; they are archived and distributed by the Goddard Earth Sciences Data and Information Services Center.  TRMM is an international project jointly sponsored by the Japan National Space Development Agency (NASDA) and the U.S.  National Aeronautics and Space Administration (NASA) Office of Earth Sciences.

Please send a copy of your publication to Help Desk, Goddard Earth Sciences Data and Information Services Center, Code 610.2, NASA GSFC, Greenbelt, MD 20771 or email the reference of your publication to gsfc-help-disc@lists.nasa.gov.</gco:CharacterString>
          </gmd:useLimitation>
           ...
        </gmd:MD_LegalConstraints>
      </gmd:resourceConstraints>

2.4          Access Constraints

Element Specification

AccessConstraints/Description   (1)
AccessConstraints/Value   (0..1)

 

Description

The Description sub-element allows the author to provide information concerning accessing constraints.  This includes any special restrictions, legal prerequisites, limitations and/or warnings on obtaining the data.  Examples of values include: Public, In-house, Limited, and None.  The Value sub-element is used for special access control list (ACL) rules (http://en.wikipedia.org/wiki/Access_control_list) - for example, to hide metadata when it isn't ready for public consumption.  Providers use the AccessConstraint/Value element to specify various restriction levels with ACLs.  For example: A provider might specify a service Level ACL that hides all items (collections for this example) with a value element set to "15.0".  There is no controlled mapping for what the values represent.

 

Profile Utilization

Collection, Granule

 

Cardinality

0..1

 

Mapping

DIF 9:

/DIF/Access_Constraints

/DIF/Extended_Metadata/Metadata

 

DIF 10:

/DIF/Access_Constraints

/DIF/Extended_Metadata/Metadata

 

ECHO 10 Collection:

/Collection/RestrictionComment

/Collection/RestrictionFlag

 

ECHO 10 Granule:

/Granule/RestrictionComment

/Granule/RestrictionFlag

 

ISO 19115-2:

/gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:resourceConstraints/gmd:MD_LegalConstraints/gmd:useLimitation/gco:CharacterString (prefix: 'Restriction Comment:' )

/gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:resourceConstraints/gmd:MD_LegalConstraints/gmd:otherConstraints/gco:CharacterString (prefix: 'Restriction Flag:' )

 

Examples

DIF 9:

<Access_Constraints>None</Access_Constraints>

 

<Extended_Metadata>
  <Metadata>
    <Group>gov.nasa.earthdata.cmr</Group>
    <Name>Restriction</Name>
    <Value>[0 or 1+]</Value>
  </Metadata>
</Extended_Metadata>

 

DIF 10:

<Access_Constraints>None.  The paper is open access.</Access_Constraints>

 

<Extended_Metadata>
  <Metadata>
    <Group>gov.nasa.earthdata.cmr</Group>
    <Name>Restriction</Name>
    <Value>[0 or 1+]</Value>
  </Metadata>
</Extended_Metadata>

 

ECHO 10 Collection:

<RestrictionFlag>0</RestrictionFlag>

<RestrictionComment>None</RestrictionComment>

 

ECHO 10 Granule:

<RestrictionFlag>0</RestrictionFlag>

<RestrictionComment>

      This product has full public access

</RestrictionComment>

 

ISO 19115-2

<gmd:resourceConstraints>

    <gmd:MD_LegalConstraints>

       <gmd:useLimitation>

          <gco:CharacterString>Restriction Comment: There are no fees for training, materials, rubrics, and assessments.  Each

   participant must complete the online form  to access materials.</gco:CharacterString>

       </gmd:useLimitation>

       <gmd:otherConstraints>

          <gco:CharacterString>Restriction Flag:0</gco:CharacterString>

       </gmd:otherConstraints>

    </gmd:MD_LegalConstraints>

</gmd:resourceConstraints>

 

2.5          Science Keywords

Element Specification

ScienceKeywords/Category   (1)
ScienceKeywords/Topic   (1)
ScienceKeywords/Term   (1)
ScienceKeywords/VariableLevel1   (0..1)
ScienceKeywords/VariableLevel2   (0..1)
ScienceKeywords/VariableLevel3   (0..1)
ScienceKeywords/DetailedVariable   (0..1)

 

Description

This element enables specification of Earth Science keywords.  All of the sub-elements except for DetailedVariable are controlled and use the GCMD Science Keyword vocabulary.  The vocabulary is managed by the KMS and it can be found at this location: http://gcmdservices.gsfc.nasa.gov/static/kms/sciencekeywords/sciencekeywords.csv.  The DetailedVariable is an uncontrolled free text element that allows the metadata author to include another keyword to more fully describe the data.

 

Profile Utilization

Collection, Service

 

Cardinality

1..*

 

Mapping

DIF 9:

/DIF/Parameters/

 

DIF 10:

/DIF/Science_Keywords/

 

ECHO 10 Collection:

/Collection/ScienceKeywords/ScienceKeyword/

 

ISO 19115-2:

/gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:descriptiveKeywords/gmd:MD_Keywords/gmd:keyword/gco:CharacterString

with

/gmi:MI_Metadata/gmd:identificationInfo/gmd:MD_DataIdentification/gmd:descriptiveKeywords/gmd:MD_Keywords/gmd:keyword/gmd:type/MD_KeywordTypeCode[@codeListValue="theme"]

 

Examples

DIF 9:

  <Parameters>
    <Category>EARTH SCIENCE</Category>
    <Topic>BIOSPHERE</Topic>
    <Term>ECOLOGICAL DYNAMICS</Term>
    <Variable_Level_1>ECOTOXICOLOGY</Variable_Level_1>
    <Variable_Level_2>SPECIES BIOACCUMULATION</Variable_Level_2>
  </Parameters>

 

DIF 10:

<Science_Keywords>
    <Category>EARTH SCIENCE</Category>
    <Topic>ATMOSPHERE</Topic>
    <Term>ATMOSPHERIC CHEMISTRY</Term>
    <Variable_Level_1>CARBON AND HYDROCARBON COMPOUNDS</Variable_Level_1>
    <Variable_Level_2>CARBON DIOXIDE</Variable_Level_2>
</Science_Keywords>

 

ECHO 10 Collection:

<ScienceKeywords>

  <ScienceKeyword>

   <CategoryKeyword>EARTH SCIENCE</CategoryKeyword>

   <TopicKeyword>HYDROSPHERE</TopicKeyword>

   <TermKeyword>SURFACE WATER</TermKeyword>

   <VariableLevel1Keyword>

    <Value>DISCHARGE/FLOW</Value>

   </VariableLevel1Keyword>

  </ScienceKeyword>

  <ScienceKeyword>

   <CategoryKeyword>EARTH SCIENCE</CategoryKeyword>

   <TopicKeyword>HYDROSPHERE</TopicKeyword>

   <TermKeyword>SURFACE WATER</TermKeyword>

   <VariableLevel1Keyword>

    <Value>STAGE HEIGHT</Value>

   </VariableLevel1Keyword>

  </ScienceKeyword>

</ScienceKeywords>

 

ISO 19115-2:

<gmd:descriptiveKeywords>

            <gmd:MD_Keywords>

               <gmd:keyword>

                  <gco:CharacterString>EARTH SCIENCE&gt;HYDROSPHERE&gt;SURFACE WATER&gt;DISCHARGE/FLOW&gt;NONE&gt;NONE&gt;NONE</gco:CharacterString>

               </gmd:keyword>

               <gmd:keyword>

                  <gco:CharacterString>EARTH SCIENCE&gt;HYDROSPHERE&gt;SURFACE WATER&gt;STAGE HEIGHT&gt;NONE&gt;NONE&gt;NONE</gco:CharacterString>

               </gmd:keyword>

               <gmd:type>

                  <gmd:MD_KeywordTypeCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#MD_KeywordTypeCode"

                                          codeListValue="theme">theme</gmd:MD_KeywordTypeCode>

               </gmd:type>

               <gmd:thesaurusName>

                  <gmd:CI_Citation>

                     <gmd:title>

                        <gco:CharacterString>NASA/GCMD Science Keywords</gco:CharacterString>

                     </gmd:title>

                        ...                    

                 </gmd:CI_Citation>

               </gmd:thesaurusName>

            </gmd:MD_Keywords>

         </gmd:descriptiveKeywords>


Appendix A                   Abbreviations and Acronyms

ACL

Access Control List

CMR

Common Metadata Repository

DAAC

Distributed Active Archive Center

DIF

Directory Interchange Format

ECHO

Earth Observing System (EOS) Clearing House

EOS

Earth Observing System

EOSDIS

Earth Observing System Data and Information System

ESDIS

Earth Science Data and Information System

GCMD

Global Change Master Directory

ISO

International Organization for Standardization

KMS

Keyword Management System

MAS

Metadata Architecture Studies

MENDS

Metadata Evolution for NASA Data Systems

NASA

National Aeronautics and Space Administration

UMM

Unified Metadata Model

UMM-C

Unified Metadata Model - Collections

UMM-Common

Unified Metadata Model - Common Elements

UMM-G

Unified Metadata Model - Granules

UMM-S

Unified Metadata Model – Services

UMM-Var

Unified Metadata Model – Variables

UMM-Vis

Unified Metadata Model – Visualization

URI

Uniform Resource Identifier

URL

Uniform Resource Locator

XML

Extensible Markup Language

XPath

XML Path Language