NOAA Technical Information Series NESDIS
DSMR-00100 Version 1.0

doi: 10.25923/f4nc-ea66

Data Stewardship Maturity Report for GHRSST Level 2P Global Subskin Sea Surface Temperature from TRMM Microwave Imager (TMI) onboard Tropical Rainfall Measurement Mission (TRMM) satellite (GDS versions 1 and 2)

<table>
  <tr>
    <th colspan="5">Table 1 Legend</th>
  </tr>
  <tr>
    <th>Level 1</th>
    <th>Level 2</th>
    <th>Level 3</th>
    <th>Level 4</th>
    <th>Level 5</th>
  </tr>
  <tr>
    <td>Ad Hoc</td>
    <td>Minimal</td>
    <td>Intermediate</td>
    <td>Advanced</td>
    <td>Optimal</td>
  </tr>
  <tr>
    <td>Little or no management</td>
    <td>Limited Management</td>
    <td>Defined Management, partially implemented</td>
    <td>Well-defined Management, fully implemented</td>
    <td>Full Management, audited, measured, controlled</td>
  </tr>
</table>

<table>
  <tr>
    <th colspan="3">Table 1. Scores for the Nine DSMM Key Components at a Glance</th>
  </tr>
  <tr>
    <th>Preservability - 5</th>
    <th>Accessibility - 5</th>
    <th>Usability - 4.5</th>
  </tr>
  <tr>
    <td>Production Sustainability - 5</td>
    <td>Data Quality Assurance - 3.5</td>
    <td>Data Quality Control/Monitoring - 3</td>
  </tr>
  <tr>
    <td>Data Quality Assessment - 3</td>
    <td>Transparency/Traceability - 2.75</td>
    <td>Data Integrity - 3</td>
  </tr>
</table>

NOAA National Centers for Environmental Information January 2020
Cover Image: Data Stewardship Rating Diagram for GHRSSST Level 2P Global Subskin Sea Surface Temperature from TRMM Microwave Imager (TMI) onboard Tropical Rainfall Measurement Mission (TRMM) satellite (GDS versions 1 and 2)

Shades of green are used to represent level 1 through level 5 ratings; denoting Ad Hoc, Minimal, Intermediate, Advanced, and Optimal stages for each of the nine key components, respectively. The dark green level indicates all the practices are completely satisfied. The lighter green levels indicate only some of the practices are satisfied. The lightest green level indicates none of the practices are satisfied.

The stewardship maturity of NCEI data product, GHRSSST Level 2P Global Subskin Sea Surface Temperature from TRMM Microwave Imager (TMI) onboard Tropical Rainfall Measurement Mission (TRMM) satellite (GDS versions 1 and 2), is assessed based on a reference stewardship maturity framework. The current maturity ratings of GHRSSST Level 2P Global Subskin Sea Surface Temperature from TRMM Microwave Imager (TMI) onboard Tropical Rainfall Measurement Mission (TRMM) satellite (GDS versions 1 and 2) are at Level 1 or higher for all nine key components with zero Level 1, one Level 2, four Level 3, one Level 4, and three Level 5 key components.
NOAA Technical Information Series NESDIS DSMR-00100 Version 1.0

The National Environmental Satellite, Data, and Information Service (NESDIS) manages the Nation’s civil Earth-observing satellite systems, as well as global national data bases for meteorology, oceanography, geophysics, and solar-terrestrial sciences. From these sources, it develops and disseminates environmental data and information products critical to the protection of life and property, national defense, and the national economy, energy development and distribution, global food supplies, and the development of natural resources.

Publication in the NOAA Technical Memorandum series does not preclude later publication in scientific journals in expanded or modified form. The NESDIS series of NOAA Technical Reports is a continuation of the former NESS and EDIS series of NOAA Technical Reports and the NESC and EDS series of Environmental Science Services Administration (ESSA) Technical Reports.

Copies of earlier reports may be available by contacting NESDIS Chief of Staff, NOAA/NESDIS, 1335 East-West Highway, SSMC1, Silver Spring, MD 20910, (301) 713-3578 .
ASSESSMENT REVISION HISTORY

<table>
  <tr>
    <th>Revision</th>
    <th>Description</th>
    <th>Date</th>
  </tr>
  <tr>
    <td>V01r00</td>
    <td>Initial Release</td>
    <td>12/08/2021</td>
  </tr>
</table>
NOAA Technical Information Series NESDIS DSMR-00100
Version 1.0
doi: 10.25923/f4nc-ea66

Data Stewardship Maturity Report for GHRSST Level 2P Global Subskin Sea Surface Temperature from TRMM Microwave Imager (TMI) onboard Tropical Rainfall Measurement Mission (TRMM) satellite (GDS versions 1 and 2)

Paul Lemieux III, Katy Luquire
NOAA's National Centers of Environmental Information (NCEI)
151 Patton Avenue, Asheville, NC 28801, (828) 271-4800

Recommended Citation

Paul Lemieux III, Katy Luquire. (2021), Data Stewardship Maturity Report for GHRSST Level 2P Global Subskin Sea Surface Temperature from TRMM Microwave Imager (TMI) onboard Tropical Rainfall Measurement Mission (TRMM) satellite (GDS versions 1 and 2)

NOAA Technical Information Series NESDIS DSMR-00100 Version 1.0, 20pp., doi: 10.25923/f4nc-ea66
Table of Contents

List of Tables .................................................................................................................. 7
Preface ............................................................................................................................. 8
1. Introduction ................................................................................................................. 9
2. Results ....................................................................................................................... 10
3. Acknowledgment ...................................................................................................... 15
4. References ............................................................................................................... 16
Appendix I The Scientific Data Stewardship Maturity Matrix (DSMM) ......................... 17
List of Tables

Table 1. Scores for the Nine DSMM Key Components at a Glance .................................................. 1
Table 2. Dataset and Data Stewardship Maturity Assessment Metadata ............................................. 11
Table 3. Stewardship Maturity Levels and Detailed Justifications for Each of Nine DSMM Key Components for the Dataset. .................................................................................................................... 12
Preface

In response to the President's Open Government Initiative and related policies, NOAA has committed to providing improved public access to all of its environmental information, to enable research and commercial innovation through ease of data discovery and use [Casey, 2016].

OneStop supports NOAA's efforts by leveraging existing access technologies and infusing specific innovations to provide improved discover, access, and visualization services for NOAA's data. Also, OneStop is viewed by a NESDIS as a pathfinder effort with an initial focus on selected high-priority datasets from NESDIS and other program data meeting OneStop standards, but eventually scalable across NOAA's data. Lastly, OneStop is implementing the USGEO Common Framework for Earth Observation Data and leveraging/supporting the NOAA Big Data Project (BDP) and Big Earth Data Initiative (BEDI) [Casey, 2016].

As with any process of improvement planning, agencies need to find out where they are in terms of their compliance to the federal regulations and what they need to do if any areas of non-compliance are identified. To this end, a unified framework would be beneficial for assessing the current stage of stewardship practices applied to individual datasets and for providing a road map that will guide future investments towards enhanced stewardship of environmental datasets. The value and quality of a dataset depends in part on the stewardship practices applied after its development and production. Therefore, a unified framework providing a holistic view of the quality of stewardship practices applied to individual datasets is beneficial to data stewards and users [Casey, 2016].

The Data Stewardship Maturity Matrix (DSMM), jointly developed by domain (data management, technology, and science) subject matter experts from NOAA’s National Centers for Environmental Information (NCEI) and Cooperative Institute for Climate and Satellites – North Carolina (CICS-NC), provides such a consistent framework [Peng et al., 2016]. The DSMM, leveraging institutional knowledge and community practices and standards, defines a graduated maturity scale for each of nine key components of scientific data stewardship to enable a consistent assessment of the measureable stewardship practices applied to a given data set or product.

The NOAA data stewardship maturity technical series captures stewardship maturity assessment results for individual datasets, provides consistent representation and citable documents of those assessments, ensures transparency, and allows better data quality information integration and content-based search and discovery of NOAA data.
Data Stewardship Maturity Report for GHRSST Level 2P Global Subskin Sea Surface Temperature from TRMM Microwave Imager (TMI) onboard Tropical Rainfall Measurement Mission (TRMM) satellite (GDS versions 1 and 2)

1. Introduction

1.1 Purpose

The purpose of this document is to describe the results of stewardship maturity assessment for NOAA Climate Data Record for Mean Layer Temperature (Upper Troposphere & Lower Stratosphere from UCAR, Version 2, utilizing the Scientific Data Stewardship Maturity Matrix or DSMM [Peng, et al, 2016]. DSMM defines levels of stewardship maturity stages for Preservability, Accessibility, Usability, Production Sustainability, Data Quality Assurance, Data Quality Control/Monitoring, Data Quality Assessment, Transparency/Traceability, and Data Integrity key components. Each of these components is ranked from ‘Ad hoc’ to ‘Optimal’ (see Appendix I). This report is based on evaluation performed by NOAA OneStop metadata specialists working with Subject Matter Experts and utilizing the DSMM template [Peng, 2016].

1.2 Scope

Assessing stewardship maturity - the current state of how datasets are documented, preserved, stewarded, and made accessible publicly, is a critical step towards meeting U.S. federal regulations, organizational requirements, and user needs [Peng et al., 2016]. The goal of this document is to provide consistent and transparent stewardship maturity information to data users and decision-makers.

1.3 Dataset Abstract

The Tropical Rainfall Measuring Mission (TRMM) Microwave Imager (TMI) is a well calibrated passive microwave radiometer, similar to the Special Sensor Microwave Imager (SSM/I), that contains lower frequency channels required for sea surface temperature (SST) retrievals. The TRMM is part of the NASA's mission to planet Earth, and is a joint venture between NASA and the Japan Aerospace Exploration Agency (JAXA) to measure precipitation, water vapor, SST and wind in the global tropical regions and was launched in 27 November 1997 from the Tanegashima Space Center in Tanegashima, Japan. The TRMM satellite travels west to east in a 402 km altitude semi-equatorial precessing orbit that results in day-to-day changes in the observation time of any given earth location between 38S and 38N. Remote Sensing Systems has produced a Version-4 TMI ocean SST dataset for the Group for High Resolution Sea Surface Temperature (GHRSST) by applying an algorithm to the 10.7 GHz channel through a removal of surface roughness effects.
In contrast to infrared SST observations, microwave retrievals can be measured through clouds, which are nearly transparent at 10.7 GHz. Microwave retrievals are also insensitive to water vapor and aerosols. The algorithm for retrieving SSTs from radiometer data is described in "AMSR Ocean Algorithm."

1.4 Document Maintenance

This document is generated and maintained by NOAA’s National Centers for Environmental Information. More on policy is available at https://www.ncei.noaa.gov/.

2. Results

The data stewardship maturity assessment information is summarized in Table 1. Each component is displayed along with its corresponding score in a color-coded table.
<table>
  <tr>
    <th colspan="2">Table 2. Dataset and Data Stewardship Maturity Assessment Metadata</th>
  </tr>
  <tr>
    <th>Dataset Title</th>
    <td>GHRSSST Level 2P Global Subskin Sea Surface Temperature from TRMM Microwave Imager (TMI) onboard Tropical Rainfall Measurement Mission (TRMM) satellite (GDS versions 1 and 2)</td>
  </tr>
  <tr>
    <th>Dataset Information URL</th>
    <td>https://www.ncei.noaa.gov/metadata/geoportal/rest/metadata/item/gov.noaa.nodc%3AGHRSSST-TMI-REMSS-L2P/html</td>
  </tr>
  <tr>
    <th>Data Provider POC (Name; E-mail; Affiliation)</th>
    <td>NOAA National Centers for Environmental Information (NCEI), NCEI.Info@noaa.gov</td>
  </tr>
  <tr>
    <th>Dataset POC (Name; E-mail; Affiliation)</th>
    <td>Sharon Tremble, tremble@remss.com, Remote Sensing Systems (REMSS)</td>
  </tr>
  <tr>
    <th>SMM Version (Document ID and Version Number)</th>
    <td>NCDC-CICS-SMM_0001_Rev.1 12/09/2014</td>
  </tr>
  <tr>
    <th>SMM POC (Name; E-mail; Affiliation)</th>
    <td>Ge Peng, ge.peng@uah.edu, University of Alabama-Huntsville</td>
  </tr>
  <tr>
    <th>SMM Template Version (Document ID and Version Numbers)</th>
    <td>NCDC-CICS-SMM_0001_Rev.1 v4.0 06/23/2015</td>
  </tr>
  <tr>
    <th>SMM Template POC</th>
    <td>Ge Peng, ge.peng@uah.edu, University of Alabama-Huntsville</td>
  </tr>
  <tr>
    <th>SMM Assessment Version (v-nm>r<mm>, e.g., v01r00)</th>
    <td>V01r06</td>
  </tr>
  <tr>
    <th>SMM Assessment Date (MM/DD/YYYY)</th>
    <td>04/29/2019</td>
  </tr>
  <tr>
    <th>SMM Assessment POC (Name; E-mail; Affiliation)</th>
    <td>Paul Lemieux III, Paul.Lemieux@noaa.gov, Earth Resources Technology, Inc.</td>
  </tr>
  <tr>
    <th>Stewardship Maturity Ratings (each key component) (kc1/kc2/kc3/kc4/kc5/kc6/kc7/kc8/kc9)</th>
    <td>5 / 5 / 4.5 / 5 / 3.5 / 3 / 3 / 2.75 / 3</td>
  </tr>
  <tr>
    <th>SMM Original Assessment Date (MM/DD/YYYY)</th>
    <td>08/23/2016</td>
  </tr>
  <tr>
    <th>SMM Original Assessment POC (Name; E-mail; Affiliation)</th>
    <td>Paul Lemieux III, Paul.Lemieux@noaa.gov, Earth Resources Technology, Inc.</td>
  </tr>
  <tr>
    <th>SMM Last Modified Date (MM/DD/YYYY)</th>
    <td>09/27/2021</td>
  </tr>
  <tr>
    <th>SMM Last Modification POC (Name; E-mail; Affiliation)</th>
    <td>Katy Luquire, catherine.luquire@noaa.gov , CASE Consultants International</td>
  </tr>
  <tr>
    <th>SMM Modified Date (MM/DD/YYYY)</th>
    <td>04/29/2019</td>
  </tr>
  <tr>
    <th>SMM Modification POC (Name; E-mail; Affiliation)</th>
    <td>Paul Lemieux III, Paul.Lemieux@noaa.gov, Earth Resources Technology, Inc.</td>
  </tr>
</table>
<table>
  <tr>
    <th>DSMM Key Component</th>
    <th>Stewardship Maturity Rating, Justification, and Comments</th>
  </tr>
  <tr>
    <td>Preservability</td>
    <td>
      Level 5<br>
      • Archived by NCEI which is a NOAA designated archive compliant to NARA standards.<br>
      • Metadata following ISO 19115-2.<br>
      • Compliant to OIAS RM.<br>
      • Plans to update metadata to ISO 19115-1 at a later date and will be a pilot dataset for the OneStop initiative.<br>
      • Multiple access points provide several layers of redundancy.<br>
      • Using NCEI Silver Spring Archive Management System, AMS.<br><br>
      Comments:<br>
      No comments
    </td>
  </tr>
  <tr>
    <td>Accessibility</td>
    <td>
      Level 5<br>
      • Collection level searchable online<br>
      • Granule level is searchable online<br>
      • Additional search options available from collection level site<br>
      • Direct file download available from<br>
      • FTP: ftp://ftp-oceans.ncei.noaa.gov/pub/data.node/ghrsst/L2P/TMI/REMSS/<br>
      • HTTP: https://www.ncei.noaa.gov/data/oceans/ghrsst/L2P/TMI/REMSS/<br>
      • THREDDS: https://www.ncei.noaa.gov/thredds-ocean/catalog/ghrsst/L2P/TMI/REMSS/catalog.html<br>
      • Dissemination reports are available to the public https://www.ncei.noaa.gov/access/ghrsst-long-term-stewardship-and-reanalysis-facility/<br>
      • New technology for OneStop search and discovery planned (i.e. ElasticSearch, Hyrax Servers, etc.) This is part of the GHRSST data group that will be OneStop ready.<br>
      • Additional enhanced data server performance (TDS, DAP) are maintained by NCEI and accessible from the metadata landing page.<br><br>
      Comments:<br>
      No comments
    </td>
  </tr>
</table>
<table>
  <tr>
    <th>DSMM Key Component</th>
    <th>Stewardship Maturity Rating, Justification, and Comments</th>
  </tr>
  <tr>
    <td rowspan="1">Usability</td>
    <td>Level 4.5<br>
      ▪ Community standard interoperable format: NetCDF<br>
      ▪ A GHRSST User Guide, Quick Start Guide, GHRSST Data Specification (GDS) manual, and other relevant documents describing GHRSST data sets can be found in the archive accession, Documentation for The Group for High Resolution Sea Surface Temperature (GHRSST) data archived at NODC (NODC Accession 0123222), https://www.ncei.noaa.gov/access/metadata/landing-page/bin/iso?id=gov.noaa.nodc:0123222<br>
      ▪ GHRSST User’s guide [GHRSST, 2011] is available online at: https://www.nodc.noaa.gov/archive/arc0072/0123222/1.1/data/0-data/GHRSSTUserGuidev91.pdf<br>
      ▪ While there is no formal ATBD available, the retrieval algorithm is described and validated in this paper [Wentz, 2015] available online here: https://doi.org/10.1175/JCLI-D-15-0155.1<br>
      ▪ Aggregating granules is possible via THREDDS server.<br>
      ▪ All GHRSST collections have error estimates.<br>
      ▪ All GHRSST collections have enhanced online capability (e.g., visualization, multiple data formats): TDS, DAP (*data servers maintained at NCEI); access from metadata main landing page<br>
      ▪ 17 year climatology [Wentz, 2015] of TRMM SST retrievals available online here: https://doi.org/10.1175/JCLI-D-15-0155.1<br>
    </td>
  </tr>
  <tr>
    <td>Comments:<br>
      No known external ranking
    </td>
  </tr>
  <tr>
    <td rowspan="1">Production Sustainability</td>
    <td>Level 5<br>
      ▪ NOAA NCEI-MD supporting long term stewardship of GHRSST collections as part of LTSRF: https://www.ncei.noaa.gov/access/ghrsst-long-term-stewardship-and-reanalysis-facility/<br>
      ▪ Long-term international commitment (GHRSST is an international collaboration).
    </td>
  </tr>
  <tr>
    <td>Comments:</td>
    <td>Changes for technology are available from individual dataset producers. NOAA does not have them documented.</td>
  </tr>
  <tr>
    <td rowspan="1">Data Quality Assurance</td>
    <td>Level 3.5<br>
      ▪ DQA procedure defined and documented in the GHRSST Data Specification user’s guide [GHRSST, 2011] available online here: https://www.nodc.noaa.gov/archive/arc0072/0123222/1.1/data/0-data/GHRSSTUserGuidev91.pdf<br>
      ▪ L2 and L3 File level quality flags exist which can be considered limited data quality assurance metadata.
    </td>
  </tr>
  <tr>
    <td>Comments:</td>
    <td>No known external reviews of the data quality procedures.</td>
  </tr>
  <tr>
    <td rowspan="1">Data Quality Control/ Monitoring</td>
    <td>Level 3<br>
      ▪ Limited Quality Control metrics are available: http://sharaku.eorc.jaxa.jp/trmm/RT/index_e.html<br>
      ▪ Sampling and analysis are frequent and systematic but not automatic<br>
      ▪ Procedure documented and available online
    </td>
  </tr>
  <tr>
    <td>Comments:</td>
    <td>No comments</td>
  </tr>
</table>
<table>
  <tr>
    <th>DSMM Key Component</th>
    <th>Stewardship Maturity Rating, Justification, and Comments</th>
  </tr>
  <tr>
    <td><b>Data Quality Assessment</b></td>
    <td>Level 3<br>
      • TRMM SST research assessment and algorithm description available in this data paper [Wentz, 2015] available online here: https://doi.org/10.1175/JCLI-D-15-0155.1<br>
      • Operational assessment available in this data paper: [Ffield, 2005] available online here: https://doi.org/10.1016/j.dsr.2004.05.013<br><br>
      Comments:<br>
      No known rankings on the data quality
    </td>
  </tr>
  <tr>
    <td><b>Transparency / Traceability</b></td>
    <td>Level 2.75<br>
      • Product information available in literature along with algorithm descriptions [Wentz, 2015] available online here: https://doi.org/10.1175/JCLI-D-15-0155.1<br>
      • OID Assigned: GHRSST-TMI-REMSS-L2P<br>
      • GHRSST datasets are under configuration management principles: : https://doi.org/10.5281/zenodo.4700465<br><br>
      Comments:<br>
      No DOI assigned<br>
      No OAD available
    </td>
  </tr>
  <tr>
    <td><b>Data Integrity</b></td>
    <td>Level 3<br>
      • Data archive integrity verifiable<br>
      • Checksum technology is available, each GHRSST_TMI_TRMM_REMSS_L2P package is accompanied by a manifest in XML format containing hash digests generated using various algorithms, including MD5, SHA-1, SHA-384, etc. That includes checksums (.md5) for every file package. https://www.nodc.noaa.gov/archive/arc0049/0099038/0099038.1.1.xml<br>
      • Data authenticity is verifiable (since data can be downloaded via HTTPS and HTTPS uses certificates to prove site authenticity)<br>
      • NCEI-MD does not provide digital signatures for data dissemination<br><br>
      Comments:<br>
      Checksum file available for download from PODAAC FTP: ftp://podaac-ftp.jpl.nasa.gov/allData/ghrsst/data/GDS2/L2P/TMI/REMSS/v4/
    </td>
  </tr>
</table>
3. Acknowledgment

This work is supported by the NOAA OneStop Project.

We thank the dataset POCs for their valuable input, as well as the collaborative efforts of the OneStop teams, especially the Metadata team. We would also like to show appreciation to Ge Peng for her contributions.

The draft of this data stewardship maturity report is systematically generated by a tool created by Kieran Hodnett and populated with the stewardship maturity assessment done by the author(s) of this report. The tool was developed based on a Word template created collaboratively by Robert Partee II, Raisa Ionin, Paul Lemieux III, Ge Peng, Don Collins, and Sonny Zinn with helpful input from the NOAA Central Library and the NCEI Communication Team.
4. References

Casey, K. (2016), The NOAA OneStop data discover and access framework project, Version:June 3, 2016. https://cdn.ioos.noaa.gov/media/2017/12/OneStop-IOOS-DMAC-03-June-2016.pdf

Peng, G. (2015) The scientific data stewardship maturity assessment model template, Version: NCDC-CICS-SMM-0001-Rev.1 v4.0 6/23/2015. doi:10.6084/m9.figshare.1211954.

Peng, G., J.L. Privette, E.J. Kearns, N.A. Ritchey, and S. Ansari (2015), A unified framework for measuring stewardship practices applied to digital environmental datasets, Data Science Journal, 13, 231-253, doi: 10.2481/dsj.14-049.

Peng, G., J. Lawrimore, V. Toner, C. Lief , R. Baldwin, N. Ritchey, D. Brinegar, and S. A. Delgreco (2016) assessing stewardship naturity of the global historical climatology network-monthly (GHCN-M) dataset: use case study and lessons learned, D-Lib Magazine, 22, doi:10.1045/november2016-peng.

GHRSST User Guide version 9.1, (2011), retrieved online: https://www.nodc.noaa.gov/archive/arc0072/0123222/1.1/data/0-data/GHRSSTUserGuidev91.pdf (Accessed December 22, 2016)

Wentz, F., (2015), A 17-Yr climate record of environmental parameters derived from the Tropical Rainfall Measuring Mission (TRMM) microwave imager, _Journal of Climate_, 28(9), 6882—6902, doi:10.1175/JCLI-D-15-0155.1.

Ffield, A., (2005), North Brazil current rings viewed by TRMM microwave imager SST and the influence of the Amazon Plume, _Deep Sea Research Part I: Oceanographic Research Papers_. 52(1), 137—160, doi:10.1016/j.dsr.2004.05.013.
Appendix I: The Scientific Data Stewardship Maturity Matrix (DSMM)

Table A1: This matrix (Version: NCDC-CICS-SMM-0001-Rev.1. 12/09/2014) describes the criterion used to evaluate data stewardship maturity for each of the nine DSMM key components [Peng et al., 2015].

<table>
  <tr>
    <th>DSMM Component</th>
    <th>Level 1<br><i>Ad hoc</i><br>Little or no management</th>
    <th>Level 2<br><i>Minimal</i><br>Limited management</th>
    <th>Level 3<br><i>Intermediate</i><br>Defined management, partially implemented</th>
    <th>Level 4<br><i>Advanced</i><br>Well-defined management, fully implemented</th>
    <th>Level 5<br><i>Optimal</i><br>Full management, audited, measured, controlled</th>
  </tr>
  <tr>
    <td rowspan="2"><i>Preservability</i><br>(<i>The state of being preservable</i>)</td>
    <td>Any storage location<br>Data only</td>
    <td>Non-designated repository<br>Redundancy<br>Limited archiving metadata</td>
    <td>Designated archive<br>Redundancy<br>Community-standard archiving metadata<br>Conforming to limited archiving standards</td>
    <td>Level 3 +<br>Conforming to community archiving standards</td>
    <td>Level 4 +<br>Archiving process performance controlled, measured, and audited<br>Future archiving standard changes planned</td>
  </tr>
  <tr>
    <td></td>
    <td></td>
    <td></td>
    <td></td>
    <td></td>
  </tr>
  <tr>
    <td rowspan="2"><i>Accessibility</i><br>(<i>The state of being searchable and accessible publicly</i>)</td>
    <td>Not publically available person-to-person</td>
    <td>Publically available direct file download (e.g., via anonymous FTP server)<br>Collection or dataset level searchable online</td>
    <td>Level 2 +<br>Non-standard data service<br>Limited data server performance<br>Granule/file level searchable<br>Limited search metrics</td>
    <td>Level 3 +<br>Community-standard data service<br>Enhanced data server performance<br>Conforming to community search metrics<br>Dissemination report metrics defined and implemented internally</td>
    <td>Level 4 +<br>Dissemination reports available online<br>Future technology and standard changes planned</td>
  </tr>
  <tr>
    <td></td>
    <td></td>
    <td></td>
    <td></td>
    <td></td>
  </tr>
</table>
<table>
  <tr>
    <th>Usability<br>(The state of being easy to use)</th>
    <th>Extensive product-specific knowledge required<br>No documentation online</th>
    <th>Non-standard data format<br>Limited documentation (e.g., user’s guide online)</th>
    <th>Community standard-based interoperable format & metadata<br>Documentation (e.g. source code, product algorithm document, processing or/and data flow diagram) online</th>
    <th>Level 3 +<br>Basic capability (e.g., subsetting, aggregating) & data characterization overall/global, e.g., climatology, error estimates) available online</th>
    <th>Level 4 +<br>Enhanced online capability (e.g., visualization, multiple data formats)<br>Community metrics of data characterization (regional/cell) online<br>External ranking</th>
  </tr>
  <tr>
    <th>Production Sustainability<br>(The state of data production being sustainable and extendable)</th>
    <th>Ad Hoc or Not applicable<br>To obligation or deliverable requirement</th>
    <th>Short-term Individual PI’s commitment (grant obligations)</th>
    <th>Medium-term Institutional commitment (contractual deliverables with specs and schedule defined)</th>
    <th>Long-term Institutional commitment<br>Product improvement process in place</th>
    <th>Level 4 +<br>National or international commitment<br>Changes for technology planned</th>
  </tr>
  <tr>
    <th>Data Quality Assurance<br>(The state of data quality being assured)</th>
    <th>Data quality assurance (DQA) procedure unknown or none</th>
    <th>Ad Hoc and random QA procedure not defined and documented</th>
    <th>DQA procedure defined and documented and partially implemented</th>
    <th>DQA procedure well documented, fully implemented and available online with master reference data<br>Limited data quality assurance metadata</th>
    <th>Level 4 +<br>DQA procedure monitored and reported<br>Conforming to community quality metadata & standards<br>External review</th>
  </tr>
</table>
<table>
  <tr>
    <th>Data Quality Control/ Monitoring<br><i>The state of data quality being controlled and monitored</i></th>
    <th>None or Sampling unknown or spotty<br>Analysis unknown or random in time</th>
    <th>Sampling and analysis are regular in time and space<br>Limited product-specific metrics defined & implemented</th>
    <th>Level 2 +<br>Sampling and analysis are frequent and systematic but not automatic<br>Community metrics defined and partially implemented<br>Procedure documented and available online</th>
    <th>Level 3 +<br>Anomaly detection procedure well-documented and fully implemented using community metrics, automatic, tracked and reported<br>Limited quality monitoring metadata</th>
    <th>Level 4 +<br>Cross-validation of temporal & spatial characteristics<br>Physical consistency check<br>Conforming to community quality metadata & standards</th>
  </tr>
  <tr>
    <th>Data Quality Assessment<br><i>(The state of data quality being assessed)</i></th>
    <th>Algorithm/ method/model<br>Theoretical basis assessed (methods and results online)</th>
    <th>Level 1 +<br>Research product assessed (methods and results online)</th>
    <th>Level 2 +<br>Operational product assessed (methods and results online)</th>
    <th>Level 3 +<br>Quality metadata assessed<br>Limited quality assessment metadata</th>
    <th>Level 4 +<br>Assessment performed on a recurring basis<br>Conforming to community quality metadata & standards<br>External ranking</th>
  </tr>
  <tr>
    <th>Transparency/ Traceability<br><i>(The state of being transparent, trackable, and traceable)</i></th>
    <th>Limited product information available<br>Person-to-person</th>
    <th>Product information available in literature</th>
    <th>Algorithm Theoretical Basis Document (ATBD) & source code online<br>Dataset configuration managed (CM)<br>Unique Object Identifier (OID) assigned (dataset, documentation, source code)<br>Data citation tracked (e.g., utilizing Digital Object Identifier</th>
    <th>Level 3 +<br>Operational Algorithm Description (OAD) online, OID assigned, and under CM</th>
    <th>Level 4 +<br>System information online<br>Complete data provenance online</th>
  </tr>
</table>
<table>
  <tr>
    <th>Data Integrity<br>(The state of data integrity being verifiable)</th>
    <th>Unknown or no data ingest integrity check</th>
    <th>Data ingest integrity verifiable (e.g., checksum technology)</th>
    <th>(DOI) system Level 2 + Data archive integrity verifiable</th>
    <th>Level 3 + Data access integrity verifiable<br>Conforming to community data integrity technology standard</th>
    <th>Level 4 +<br>Data authenticity verifiable (e.g., data signature technology)<br>Performance of data integrity check monitored and reported</th>
  </tr>
</table>
Table 1 Legend
Level 1	Level 2	Level 3	Level 4	Level 5
Ad Hoc	Minimal	Intermediate	Advanced	Optimal
Little or no management	Limited Management	Defined Management, partially implemented	Well-defined Management, fully implemented	Full Management, audited, measured, controlled
Table 1. Scores for the Nine DSMM Key Components at a Glance
Preservability - 5	Accessibility - 5	Usability - 4.5
Production Sustainability - 5	Data Quality Assurance - 3.5	Data Quality Control/Monitoring - 3
Data Quality Assessment - 3	Transparency/Traceability - 2.75	Data Integrity - 3
Table 2. Dataset and Data Stewardship Maturity Assessment Metadata
Dataset Title	GHRSSST Level 2P Global Subskin Sea Surface Temperature from TRMM Microwave Imager (TMI) onboard Tropical Rainfall Measurement Mission (TRMM) satellite (GDS versions 1 and 2)
Dataset Information URL	https://www.ncei.noaa.gov/metadata/geoportal/rest/metadata/item/gov.noaa.nodc%3AGHRSSST-TMI-REMSS-L2P/html
Data Provider POC (Name; E-mail; Affiliation)	NOAA National Centers for Environmental Information (NCEI), NCEI.Info@noaa.gov
Dataset POC (Name; E-mail; Affiliation)	Sharon Tremble, tremble@remss.com, Remote Sensing Systems (REMSS)
SMM Version (Document ID and Version Number)	NCDC-CICS-SMM_0001_Rev.1 12/09/2014
SMM POC (Name; E-mail; Affiliation)	Ge Peng, ge.peng@uah.edu, University of Alabama-Huntsville
SMM Template Version (Document ID and Version Numbers)	NCDC-CICS-SMM_0001_Rev.1 v4.0 06/23/2015
SMM Template POC	Ge Peng, ge.peng@uah.edu, University of Alabama-Huntsville
SMM Assessment Version (v-nm>r, e.g., v01r00)	V01r06
SMM Assessment Date (MM/DD/YYYY)	04/29/2019
SMM Assessment POC (Name; E-mail; Affiliation)	Paul Lemieux III, Paul.Lemieux@noaa.gov, Earth Resources Technology, Inc.
Stewardship Maturity Ratings (each key component) (kc1/kc2/kc3/kc4/kc5/kc6/kc7/kc8/kc9)	5 / 5 / 4.5 / 5 / 3.5 / 3 / 3 / 2.75 / 3
SMM Original Assessment Date (MM/DD/YYYY)	08/23/2016
SMM Original Assessment POC (Name; E-mail; Affiliation)	Paul Lemieux III, Paul.Lemieux@noaa.gov, Earth Resources Technology, Inc.
SMM Last Modified Date (MM/DD/YYYY)	09/27/2021
SMM Last Modification POC (Name; E-mail; Affiliation)	Katy Luquire, catherine.luquire@noaa.gov , CASE Consultants International
SMM Modified Date (MM/DD/YYYY)	04/29/2019
SMM Modification POC (Name; E-mail; Affiliation)	Paul Lemieux III, Paul.Lemieux@noaa.gov, Earth Resources Technology, Inc.
DSMM Key Component	Stewardship Maturity Rating, Justification, and Comments
Usability	Level 4.5 ▪ Community standard interoperable format: NetCDF ▪ A GHRSST User Guide, Quick Start Guide, GHRSST Data Specification (GDS) manual, and other relevant documents describing GHRSST data sets can be found in the archive accession, Documentation for The Group for High Resolution Sea Surface Temperature (GHRSST) data archived at NODC (NODC Accession 0123222), https://www.ncei.noaa.gov/access/metadata/landing-page/bin/iso?id=gov.noaa.nodc:0123222 ▪ GHRSST User’s guide [GHRSST, 2011] is available online at: https://www.nodc.noaa.gov/archive/arc0072/0123222/1.1/data/0-data/GHRSSTUserGuidev91.pdf ▪ While there is no formal ATBD available, the retrieval algorithm is described and validated in this paper [Wentz, 2015] available online here: https://doi.org/10.1175/JCLI-D-15-0155.1 ▪ Aggregating granules is possible via THREDDS server. ▪ All GHRSST collections have error estimates. ▪ All GHRSST collections have enhanced online capability (e.g., visualization, multiple data formats): TDS, DAP (*data servers maintained at NCEI); access from metadata main landing page ▪ 17 year climatology [Wentz, 2015] of TRMM SST retrievals available online here: https://doi.org/10.1175/JCLI-D-15-0155.1
Comments: No known external ranking
Production Sustainability	Level 5 ▪ NOAA NCEI-MD supporting long term stewardship of GHRSST collections as part of LTSRF: https://www.ncei.noaa.gov/access/ghrsst-long-term-stewardship-and-reanalysis-facility/ ▪ Long-term international commitment (GHRSST is an international collaboration).
Comments:	Changes for technology are available from individual dataset producers. NOAA does not have them documented.
Data Quality Assurance	Level 3.5 ▪ DQA procedure defined and documented in the GHRSST Data Specification user’s guide [GHRSST, 2011] available online here: https://www.nodc.noaa.gov/archive/arc0072/0123222/1.1/data/0-data/GHRSSTUserGuidev91.pdf ▪ L2 and L3 File level quality flags exist which can be considered limited data quality assurance metadata.
Comments:	No known external reviews of the data quality procedures.
Data Quality Control/ Monitoring	Level 3 ▪ Limited Quality Control metrics are available: http://sharaku.eorc.jaxa.jp/trmm/RT/index_e.html ▪ Sampling and analysis are frequent and systematic but not automatic ▪ Procedure documented and available online
Comments:	No comments
DSMM Key Component	Stewardship Maturity Rating, Justification, and Comments
Data Quality Assessment	Level 3 • TRMM SST research assessment and algorithm description available in this data paper [Wentz, 2015] available online here: https://doi.org/10.1175/JCLI-D-15-0155.1 • Operational assessment available in this data paper: [Ffield, 2005] available online here: https://doi.org/10.1016/j.dsr.2004.05.013 Comments: No known rankings on the data quality
Transparency / Traceability	Level 2.75 • Product information available in literature along with algorithm descriptions [Wentz, 2015] available online here: https://doi.org/10.1175/JCLI-D-15-0155.1 • OID Assigned: GHRSST-TMI-REMSS-L2P • GHRSST datasets are under configuration management principles: : https://doi.org/10.5281/zenodo.4700465 Comments: No DOI assigned No OAD available
Data Integrity	Level 3 • Data archive integrity verifiable • Checksum technology is available, each GHRSST_TMI_TRMM_REMSS_L2P package is accompanied by a manifest in XML format containing hash digests generated using various algorithms, including MD5, SHA-1, SHA-384, etc. That includes checksums (.md5) for every file package. https://www.nodc.noaa.gov/archive/arc0049/0099038/0099038.1.1.xml • Data authenticity is verifiable (since data can be downloaded via HTTPS and HTTPS uses certificates to prove site authenticity) • NCEI-MD does not provide digital signatures for data dissemination Comments: Checksum file available for download from PODAAC FTP: ftp://podaac-ftp.jpl.nasa.gov/allData/ghrsst/data/GDS2/L2P/TMI/REMSS/v4/
DSMM Component	Level 1 Ad hoc Little or no management	Level 2 Minimal Limited management	Level 3 Intermediate Defined management, partially implemented	Level 4 Advanced Well-defined management, fully implemented	Level 5 Optimal Full management, audited, measured, controlled
Preservability (The state of being preservable)	Any storage location Data only	Non-designated repository Redundancy Limited archiving metadata	Designated archive Redundancy Community-standard archiving metadata Conforming to limited archiving standards	Level 3 + Conforming to community archiving standards	Level 4 + Archiving process performance controlled, measured, and audited Future archiving standard changes planned
Preservability (The state of being preservable)
Accessibility (The state of being searchable and accessible publicly)	Not publically available person-to-person	Publically available direct file download (e.g., via anonymous FTP server) Collection or dataset level searchable online	Level 2 + Non-standard data service Limited data server performance Granule/file level searchable Limited search metrics	Level 3 + Community-standard data service Enhanced data server performance Conforming to community search metrics Dissemination report metrics defined and implemented internally	Level 4 + Dissemination reports available online Future technology and standard changes planned
Usability (The state of being easy to use)	Extensive product-specific knowledge required No documentation online	Non-standard data format Limited documentation (e.g., user’s guide online)	Community standard-based interoperable format & metadata Documentation (e.g. source code, product algorithm document, processing or/and data flow diagram) online	Level 3 + Basic capability (e.g., subsetting, aggregating) & data characterization overall/global, e.g., climatology, error estimates) available online	Level 4 + Enhanced online capability (e.g., visualization, multiple data formats) Community metrics of data characterization (regional/cell) online External ranking
Production Sustainability (The state of data production being sustainable and extendable)	Ad Hoc or Not applicable To obligation or deliverable requirement	Short-term Individual PI’s commitment (grant obligations)	Medium-term Institutional commitment (contractual deliverables with specs and schedule defined)	Long-term Institutional commitment Product improvement process in place	Level 4 + National or international commitment Changes for technology planned
Data Quality Assurance (The state of data quality being assured)	Data quality assurance (DQA) procedure unknown or none	Ad Hoc and random QA procedure not defined and documented	DQA procedure defined and documented and partially implemented	DQA procedure well documented, fully implemented and available online with master reference data Limited data quality assurance metadata	Level 4 + DQA procedure monitored and reported Conforming to community quality metadata & standards External review
Data Quality Control/ Monitoring The state of data quality being controlled and monitored	None or Sampling unknown or spotty Analysis unknown or random in time	Sampling and analysis are regular in time and space Limited product-specific metrics defined & implemented	Level 2 + Sampling and analysis are frequent and systematic but not automatic Community metrics defined and partially implemented Procedure documented and available online	Level 3 + Anomaly detection procedure well-documented and fully implemented using community metrics, automatic, tracked and reported Limited quality monitoring metadata	Level 4 + Cross-validation of temporal & spatial characteristics Physical consistency check Conforming to community quality metadata & standards
Data Quality Assessment (The state of data quality being assessed)	Algorithm/ method/model Theoretical basis assessed (methods and results online)	Level 1 + Research product assessed (methods and results online)	Level 2 + Operational product assessed (methods and results online)	Level 3 + Quality metadata assessed Limited quality assessment metadata	Level 4 + Assessment performed on a recurring basis Conforming to community quality metadata & standards External ranking
Transparency/ Traceability (The state of being transparent, trackable, and traceable)	Limited product information available Person-to-person	Product information available in literature	Algorithm Theoretical Basis Document (ATBD) & source code online Dataset configuration managed (CM) Unique Object Identifier (OID) assigned (dataset, documentation, source code) Data citation tracked (e.g., utilizing Digital Object Identifier	Level 3 + Operational Algorithm Description (OAD) online, OID assigned, and under CM	Level 4 + System information online Complete data provenance online