CEOS Analysis Ready Data (CEOS-ARD) are satellite data that have been processed to a minimum set of requirements and organized into a form that allows immediate analysis with a minimum of additional user effort and interoperability both through time and with other datasets.
Visit ceos.org/ard for more information on CEOS-ARD, self-assessments and CEOS-ARD certified datasets. ceos.org/ard is the official reference for all CEOS-ARD documentation, while this repository remains a development version.
Caution
This is a very early work-in-progress version of CEOS-ARD!
For the latest released CEOS-ARD PFS versions please visit the CEOS ARD website.
Many satellite data users lack the expertise, infrastructure and internet bandwidth to efficiently and effectively access, preprocess, and utilize the growing volume of space-based data for local, regional, and national decision-making. Furthermore, even sophisticated users of EO data typically invest a large proportion of their effort into data preparation. This is a major barrier to full and successful utilization of space-based data, and threatens the success of major global and regional initiatives supported by the Committee on Earth Observation Satellites (CEOS). As data volumes grow, this barrier is becoming more significant for all users.
Countries and international organizations have expressed a desire for support from CEOS to facilitate access to and processing of satellite data into CEOS Analysis Ready Data (CEOS-ARD) products. Systematic and regular provision of CEOS-ARD will greatly reduce the burden on global satellite data users.
Read also into the CEOS-ARD Strategy 2021.
Below you can find all Product Family Specifications (PFS) that are currently defined by CEOS.
Warning
The PFS versions listed below are the latest unreleased draft versions.
For the latest released version please visit the CEOS ARD website.
- Synthetic Aperture Radar (SAR)
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Normalised Radar Backscatter (NRB)
Latest draft version: HTML, PDF, Word (docx)
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Polarimetric Radar (POL)
Latest draft version: HTML, PDF, Word (docx)
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Ocean Radar Backscatter (ORB)
Latest draft version: HTML, PDF, Word (docx)
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Geocoded Single-Look Complex (GSLC)
Latest draft version: HTML, PDF, Word (docx)
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- Optical
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Surface Reflectance (SR)
Latest draft version: HTML, PDF, Word (docx)
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Surface Temperature (ST)
Latest draft version: HTML, PDF, Word (docx)
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Nighttime Lights Surface Radiance (NLSR)
Latest draft version: HTML, PDF, Word (docx)
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The repository is structured as follows:
assets: contains all imagery and other assets for the PFSes.glossary: contains terms and their definitions.pfs: contains the details for each PFS, e.g. document information (id, title, descriptions, authors, etc), document structure, (references to) requirements.references: bibtex files for the citations/references.requirements: the individual requirements that PFSes can pick from. Read more...sections: the editorial content of the PFSes, e.g. annexes, requirement categories, introductory chapters.
Most people won't need to look at the following two folders as they are primarily for technical purposes:
.github: contains issue templates and workflows for GitHubtemplates: the layout and styles for Markdown, Word, HTML, etc.
Some high-level information (governance framework, strategy, guides, license, etc.) reside on the top-level of the repository.
We welcome contributions, especially via GitHub issues and pull requests! The Contributor Guidelines describe the procedures. All contributors are encouraged to read the guidelines.
The CEOS-ARD Governance Framework (2021) is summarized in the following sections.
The definition of CEOS-ARD is not exclusive or prescriptive. The definition of CEOS-ARD reflects the attributes of fundamental measurement products for the majority of global remote sensing users with land imaging applications, and are the minimum level required to support time series analysis and data interoperability.
Each PFS details specific 'Threshold' and 'Goal' requirements for:
- General Metadata (including Source and Product Metadata)
- Per-pixel Metadata
- Radiometric and Atmospheric Corrections
- Geometric Corrections
Product Assessments checks how well the specific product complies with each of the metadata and calibration criteria in the Product Family Specification. Includes a description of ‘how’ it complies.
The CEOS Working Group on Calibration & Validation (WGCV) has defined formal processes for how these assessments will be carried out, including the peer reviews that will be undertaken by the WGCV.
A self-assessment guide has been made available.
The CEOS-ARD Extension to the SpatioTemporal Asset Catalog (STAC) specification specifies how to create STAC Items and Collections that comply to the various CEOS-ARD product family specifications. The repository for this extension can be found here.
Content in this repository is accessible under the Creative Commons Attribution 4.0 International (CC-BY-4.0) license.
The CEOS-ARD team can be contacted at [email protected]