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Documentation

A short QA4EO "user" guide has been produced to provide background into QA4EO and how one would start implementing it. Download your copy of the QA4EO GUIDE here.

The Quality Assurance Framework for Earth Observation consists of seven distinct key guidelines linked through an overarching document - the QA4EO PRINCIPLES. QA4EO activities and tasks are outlined in the QA4EO Implementation Plan.

Guideline QA4EO-QAEO-GEN-DQK-002 (“A guide to content of a documentary procedure to meet the Quality Assurance requirements of GEO”) is essentially the core requirement for QA4EO. If processes are carried out in full compliance of this fundamental guide, a user can have confidence in any resultant output. QA4EO-QAEO-GEN-DQK-002 provides the template to guide the user through the process, aided by the other six key guidelines for specific technical details, but in principle this guide provides all the information needed to be compliant.

In considering issues of interoperability and international harmonisation within any specific GEO community it is often helpful to start with a review of generic activities and from these define key requirements that drive the QA process. For example, in the space sector all derived information products originate from a measurement made by a satellite sensor. Thus, a set of key activities for every sensor could be defined for implementation during its development and operation. Guideline QA4EO-QAEO-GEN-DQK-001 provides this satellite-based example to illustrate the process. This example shows how the top level requirements drive the need for community references, indicate critical generic deliverables for bias evaluation through comparisons and act as a starting point for more detailed technical procedures to underpin the top level requirements.

The QA4EO PRINCIPLES provides the background to QA4EO and introduces the key guidelines:

QA4EO-QAEO-GEN-DQK-001 A guide to establish a Quality Indicator on a satellite sensor derived data product
QA4EO-QAEO-GEN-DQK-002 A guide to content of a documentary procedure to meet the Quality Assurance requirements of CEOS
QA4EO-QAEO-GEN-DQK-003 A guide to “reference standards” in support of Quality
Assurance requirements of QA4EO
QA4EO-QAEO-GEN-DQK-004 A guide to comparisons – organisation, operation and analysis to establish measurement equivalence to underpin the Quality Assurance requirements of QA4EO
QA4EO-QAEO-GEN-DQK-005 A guide to establishing validated models, algorithms and
software to underpin the Quality Assurance requirements of QA4EO
QA4EO-QAEO-GEN-DQK-006 A guide to expression of uncertainty of measurements

QA4EO-QAEO-GEN-DQK-007

A guide to establishing quantitative evidence of traceability to underpin the Quality Assurance requirements of QA4EO

Other more community-specific QA4EO procedures (currently all in draft form) are as follows:

QA4EO-WGCV-IVO-CLP-001 Use of the Moon for in-flight calibration stability monitoring
QA4EO-WGCV-IVO-CLP-002 Protocol for the CEOS WGCV Comparison of techniques/instruments used for surface IR radiance/brightness temperature measurements
QA4EO-WGCV-IVO-CLP-003 A procedure for establishing a “land-based” reference standard test-site
QA4EO-WGCV-IVO-CLP-004 A best practise guide to land “test-site” characterisation
QA4EO-WGCV-IVO-CLP-005 Guidelines for the identification and set-up of new systems complying with requirements for satellite ocean color applications
QA4EO-WGCV-IVO-CLP-006 Methodologies that should be applied to determine immersion factors for both radiance and irradiance underwater sensors
QA4EO-WGCV-IVO-CLP-007 Absolute Calibration using Rayleigh Scattering
QA4EO-WGCV-IVO-CLP-008 Protocol for the CEOS WGCV pilot Comparison of techniques/instruments used for vicarious calibration of land surface imaging through a ground reference standard test site