# SPEXone Polarimeter
*sensor . products*

Compact multi-angle channeled spectropolarimeter on PACE for aerosol and cloud polarimetric retrievals.

## Specifications
- **product status**: operational
- **deployment context**: orbital
- **manufacturer**: sron
- **sensor**: {"instrument_family":"passive-optical","measurement_principle":"passive","spectral_range_nm":{"min":385,"max":770},"sampling_nm":2,"gsd_m":{"native":4600},"swath_km":100,"notes":"SRON reports 4.6 x 5.4 km spatial resolution; native GSD stores the smaller dimension pending full sensor research."}
- **entity type**: sensor
- **last verified date**: 2026-06-16
- **verified by**: agency-doc
- **claim status**: agency-sourced
- **provider**: sron
- **attributes**: {"kind":"sensor","product_status":"operational","deployment_context":"orbital","manufacturer":"sron","description":"Compact multi-angle channeled spectropolarimeter on PACE for aerosol and cloud polarimetric retrievals.","sensor":"{\"instrument_family\":\"passive-optical\",\"measurement_principle\":\"passive\",\"spectral_range_nm\":{\"min\":385,\"max\":770},\"sampling_nm\":2,\"gsd_m\":{\"native\":4600},\"swath_km\":100,\"notes\":\"SRON reports 4.6 x 5.4 km spatial resolution; native GSD stores the smaller dimension pending full sensor research.\"}"}
- **relevance**: in-scope

## Editorial
SPEXone is a compact passive optical multi-angle channeled spectropolarimeter on PACE for aerosol and cloud polarimetric retrievals. [^nasa-pace-spexone] [^nasa-earthdata-spexone] It measures radiance and linear polarization continuously from 385 to 770 nm. [^nasa-pace-spexone] [^sron-spexone] Radiance spectral resolution is 2-5 nm, and degree-of-linear-polarization resolution is 10-40 nm. [^nasa-pace-spexone] The instrument provides about 5.4 x 4.6 km spatial resolution, about 2.7 x 2.3 km spatial sampling, and an approximately 100 km swath. [^nasa-pace-spexone] [^sron-spexone] SPEXone acquires five ground viewing angles for multi-angle polarimetry, including nadir and +/-58 degree views. [^nasa-pace-spexone] [^sron-spexone] Specified accuracy is 0.003 polarimetric and 2 percent radiometric. [^nasa-pace-spexone] Multi-angle polarimetry is demonstrated on PACE through SPEXone's mission role, with a narrow swath that complements broader ocean-colour and atmospheric sensors on the same platform. [^nasa-pace-spexone]

## Compositional position
- pace (missions) --[mission_payloads]--> SPEXone Polarimeter

## Sources
- [nasa-pace-spexone] | SPEXone Polarimeter, NASA PACE | https://pace.oceansciences.org/spexone.htm | tier=agency-doc | accessed=2026-06-16
- [sron-spexone] | SPEXone Monitoring, SRON | https://www.sron.nl/en/pillars/science/earth/spexone-monitoring/ | tier=agency-doc | accessed=2026-06-16
- [nasa-earthdata-spexone] | Spectro-polarimeter for Planetary Exploration one, NASA Earthdata | https://www.earthdata.nasa.gov/data/instruments/spexone | tier=agency-doc | accessed=2026-06-16

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