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Standards Development
This Technical Specification defines the calibration and validation of Earth observing (EO) data acquired by SAR sensors and products derived from SAR data. The specified SAR sensors include general working modes and advanced working modes.
In this specification, the term calibration refers to the process to correct the data, not only geometrically and radiometrically, but also characteristically for qualitative and quantitive applications, and the term validation refers to the process to evaluate the quality and accuracy of the calibrated data and derived products.
This Technical Specification will also address the associated metadata related to calibration and validation that has not been defined in other ISO geographic information standards. This technical specification does not address the calibration of SAR sensors and validation of SAR sensor calibration, which are covered by ISO 19159-3.
Remote sensing is one of the major data sources for geographic information. As a kind of active imaging radar sensor, SAR has the ability to observe the earth in both day and night, and for almost all weather conditions. As a result, SAR data and its derived products has been widely used in various fields such as disaster monitoring, geological mapping, environmental protection and so on. Such applications typically integrate SAR data from different countries and different sensors. The quality of those data and products are essential for the success of such applications. Calibration and validation are the fundamental processes to assess and improve the data quality and ensure the EO data and derived products from different sources comparable and interoperable.
The calibration and validation include the SAR sensors themselves, SAR data collected by sensors, and products derived from SAR data. Realizing the importance of calibration and validation in the remote sensing applications, ISO TC 211 has developed the ISO 19159 series of technical specification to cover the calibration of sensor hardware and validation of the calibration results. ISO/TS 19159-3 is about calibration and validation of SAR/InSAR sensors. But the standards for calibration and validation of remote sensing data and their derived products have not been developed yet.
Therefore, ISO 19124 series are proposed to standardize calibration and validation of remote sensing data and products. The Part 1 ISO 19124-1 is at the WD stage. It addressed the overall framework and common calibration and validation processes related to EO data and derived products from different types of remote sensors.
This proposal is Part 2 of ISO 19124 series. Its purpose is to establish such a standard to standardize the calibration and validation of SAR data and their derived products.
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