The DOI Process
- What is a DOI and How is it Used?
- Where are DOIs Located?
- The Anatomy of a DOI
- Data Requirements
- Metadata Requirements
- The DOI Assignment Process
- Assignment Timeline
- Getting Started
- Other Resources for DOI Registration
- Where to Learn More
What is a DOI and How is it Used?
DOIs, or Digital Object Identifiers, are permanent and unique references to data products in long term storage and distribution spaces. Once registered, a DOI can never be changed or deleted. Because DOIs are fixed, the data products can be found throughout their lifetime, even if their location on the web changes. Each DOI links to a public landing page. NASA’s data archive centers (often referred to as Distributed Active Archive Centers, or DAACs) have a commitment with DataCite to ensure that those landing pages are present online and actively maintained.
In addition to facilitating data retrieval, DOIs allow researchers to publish citations for the exact data and data products used in their research. Because a DOI is assigned to a specific data product, there is no confusion about which data product or which version of the data product is being cited. Therefore, many journals require DOIs for data citations. The DOI is found on the Additional Information tab of a CMR result page. Computers and humans can also access data product DOIs through various interfaces including Earthdata Search, where it appears with other data product descriptive information.
The Earth Science Data and Information System (ESDIS) Project requires DAACs to publicize citation policies on their websites and in communications accompanying data, including the proper use of DOIs in data citations.
Where Are DOIs Located?
As part of the metadata for a data product, DOIs can be found as part of the data description in metadata repositories such as NASA's Common Metadata Repository (CMR). The DOI is found on the Additional Information tab of a CMR result page. Computers and humans can also access data product DOIs through various interfaces including Earthdata Search, where it appears with other data product descriptive information.
The Anatomy of a DOI
An object’s DOI has two parts: a prefix and a suffix. The prefix begins with the number 10 (which is called a handle and identifies the string of numbers and letters after the 10 as being part of a DOI) followed by a number identifying the organization or agency registering the DOI, called the registration agent. The DOIs for NASA's Earth Observing System Data and Information System (EOSDIS) data products start with 10.5067. The DOI suffix (which is separated from the prefix by a forward slash) uniquely identifies the object, and its format is assigned and managed by the body or organization submitting the DOI for formal registration, such as the Earth Science Data Information Systems (ESDIS) Project and the respective DAAC.
For example, the structured DOI assigned to the MODIS/Terra Land Surface Temperature and Emissivity Monthly Level-3 Global 6 km Grid SIN Version 6 product at NASA’s Land Processes DAAC (LP DAAC) is 10.5067/MODIS/MOD11B3.006. The prefix 10.5067 indicates that this is an EOSDIS data product. The suffix MODIS/MOD11B3.006 indicates that this is a MODIS product, the product name is MOD11B3, and this is MODIS Version 6 data.
To meet the criteria set by the ESDIS Project that identify EOSDIS data products and supporting documents eligible for a DOI, the data product must be:
- A standard data product, a near real-time (NRT) data product, or documentation related to a data product;
- A data product that is part of a mission or that is planned or already being generated, archived, and/or distributed by a DAAC.
- A data product supported by NASA's Earth Science Division; or
- Any other data product approved for archival at a DAAC.
If your product does not meet these criteria, contact the EOSDIS DOI team.
The DOI is an integral component of data product metadata. The DAAC that archives a data product is responsible for providing the ESDIS Project with appropriate metadata, which helps describe or identify the data (e.g., when the data were collected or the instrument used to collect them and the URL of the data product’s landing page). Metadata also make it easy to find information about the creation and history of a data product.
The DOI Assignment Process
If the data product meets these criteria, a DOI is assigned as part of the data archival process. The assignment process involves three organizations:
- NASA's ESDIS Project manages DOIs as they are created and provides guidance to the DAACs in developing DOI suffixes, ensuring the completeness of DOI names and associated metadata, and reserving, registering, and updating DOIs;
- The DAACs provide the ESDIS Project with data product metadata, develop data product landing pages, and provide changes in product metadata or landing page Internet locations; and
- DataCite registers EOSDIS DOIs and provides access to the DOI handling system that enables the ESDIS Project to manage DOIs.
The time required for DOI assignment depends on the availability and accuracy of the information submitted to the DAAC. A time estimate can be given at the DAAC consultation. The image below shows a typical timeline.
Data providers can reserve DOIs prior to the delivery of actual data. Formal registration of DOIs is completed at the end of the archival process. Once DOIs are registered, the data are available to the public.
The DAAC is typically the starting point for the DOI assignment process for data sets that will be delivered to the DAAC. Data providers are notified of DOIs as early as possible, particularly for use in preparing papers.
To initiate the process of requesting a DOI, send an email request to the DAAC responsible for the distribution of your data product. If a DOI is necessary before investigation data are delivered to the assigned DAAC, contact the assigned NASA data repository for assistance. If you have questions about DOI and assignments, contact us.
Other Resources for DOI Registration
If you are not a NASA employee, are registering a non-ESDIS digital product, or unable to get a DOI via the DAAC, there are other options available through FAIRsharing.org. Data should be submitted to discipline-specific, community-recognized repositories when possible, or to generalist repositories if no suitable community resource is available.
Where to Learn More
- DataCite Support
- DOI Resolution Tool
- DOI Citation Formatter
- ESDIS DOI Policy Document, Version 4.4
- Enhancing the Discoverability of NASA Earth Science Data Through Digital Object Identifiers (DOIs)
- ESDIS Metadata Standards and Practices
- Near Real-Time versus Standard Products
- Data Citation Guidelines for Earth Science Data , Version 2
Page Last Updated: Nov 10, 2020 at 2:22 PM EST