# CEOS WGCV IVOS Calibration and Validation Framework
*methodology . standards*

CEOS WGCV IVOS is the Infrared and Visible Optical Sensors Subgroup, the international sensor-level calibration and validation protocol authority for VNIR, SWIR, and TIR optical EO instruments. It defines Pseudo-Invariant Calibration Sites, inter-sensor cross-calibration protocols, and vicarious calibration best practices that anchor radiometric harmonisation across hyperspectral missions including PRISMA, EnMAP, EMIT, and HISUI.

## Specifications
- **authority**: ceos
- **url**: https://ceos.org/ourwork/workinggroups/wgcv/subgroups/ivos/
- **last verified date**: "2026-05-19T00:00:00.000Z"
- **verified by**: agency-doc
- **claim status**: agency-verified

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Source: https://eo-atlas.org/standards/ceos-ivos
Maintainer: SpectraWorks B.V. (CC-BY 4.0)