# Infrared Atmospheric Sounding Interferometer - New Generation
*sensor . products*

Passive infrared sounder on Metop-SG A satellites providing radiance spectra for atmospheric temperature, humidity, clouds, greenhouse gases, aerosols, and trace gases.

## Specifications
- **product status**: operational
- **manufacturer**: cnes
- **sensor**: {"measurement_principle":"passive","spec_disclosure":"undisclosed","instrument_family":"passive-optical"}
- **deployment context**: orbital
- **entity type**: sensor
- **last verified date**: 2026-06-16
- **verified by**: agency-doc
- **claim status**: agency-sourced
- **provider**: cnes
- **attributes**: {"product_status":"operational","manufacturer":"cnes","sensor":"{\"measurement_principle\":\"passive\",\"spec_disclosure\":\"undisclosed\",\"instrument_family\":\"passive-optical\"}","kind":"sensor","deployment_context":"orbital","description":"Passive infrared sounder on Metop-SG A satellites providing radiance spectra for atmospheric temperature, humidity, clouds, greenhouse gases, aerosols, and trace gases."}
- **relevance**: in-scope

## Editorial
Infrared Atmospheric Sounding Interferometer - New Generation (IASI-NG) is a passive optical cross-nadir infrared hyperspectral sounder for the Metop-SG A series, succeeding the first-generation IASI instruments on Metop. [^wmo-iasi-ng] It records 16,921 spectral samples across 645-2760 cm^-1, about 3620-15500 nm, with four 12 km instantaneous fields of view inside each 100 x 100 km field and an average 24 km sampling distance. [^wmo-iasi-ng] The swath is about 2000 km, giving broad cross-track coverage for atmospheric temperature and humidity sounding, cloud parameters, greenhouse gases, aerosols and trace gases. [^wmo-iasi-ng] IASI-NG has demonstrated atmospheric sounding on Metop-SG A1 through first returned data; first IASI-NG data returned in October 2025, with calibration and validation under way ahead of operational distribution to users in 2026. [^eumetsat-iasi-first-data] CNES has overall technical responsibility for IASI-NG within the Metop-SG atmospheric-sounding payload set. [^cnes-iasi-ng]

## Compositional position
- metop-sg-a1 (missions) --[mission_payloads]--> Infrared Atmospheric Sounding Interferometer - New Generation

## Sources
- [wmo-iasi-ng] | WMO OSCAR instrument record: IASI-NG | https://space.oscar.wmo.int/instruments/view/iasi_ng | tier=agency-doc | accessed=2026-06-16
- [eumetsat-iasi-first-data] | IASI-NG instrument on Metop-SGA1 satellite sends back first data, EUMETSAT | https://www.eumetsat.int/iasi-ng-instrument-metop-sga1-satellite-sends-back-first-data | tier=agency-doc | accessed=2026-06-16
- [cnes-iasi-ng] | IASI-NG project page, CNES | https://cnes.fr/en/projects/iasi-ng | tier=agency-doc | accessed=2026-06-16

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Source: https://eo-atlas.org/products/sensor/iasi-ng
Maintainer: SpectraWorks B.V. (CC-BY 4.0)