# Hyper-Angular Rainbow Polarimeter 2
*sensor . products*

PACE wide-angle hyper-angular imaging polarimeter for aerosol, cloud, land, and water-surface polarimetric observations.

## Specifications
- **product status**: operational
- **deployment context**: orbital
- **manufacturer**: umbc
- **sensor**: {"instrument_family":"passive-optical","measurement_principle":"passive","spectral_range_nm":{"min":441,"max":873},"spectral_band_count":4,"bands":[{"name":"blue","centre_nm":441,"fwhm_nm":10},{"name":"green","centre_nm":549,"fwhm_nm":10},{"name":"red","centre_nm":669,"fwhm_nm":10},{"name":"nir","centre_nm":873,"fwhm_nm":40}],"gsd_m":{"native":3000},"swath_km":1556,"notes":"NASA Earthdata lists four spectral bands and up to 60 along-track viewing angles; NASA PACE mission page lists 2-day global coverage and 1556 km nadir swath."}
- **entity type**: sensor
- **last verified date**: 2026-06-16
- **verified by**: agency-doc
- **claim status**: agency-sourced
- **provider**: umbc
- **attributes**: {"kind":"sensor","product_status":"operational","deployment_context":"orbital","manufacturer":"umbc","description":"PACE wide-angle hyper-angular imaging polarimeter for aerosol, cloud, land, and water-surface polarimetric observations.","sensor":"{\"instrument_family\":\"passive-optical\",\"measurement_principle\":\"passive\",\"spectral_range_nm\":{\"min\":441,\"max\":873},\"spectral_band_count\":4,\"bands\":[{\"name\":\"blue\",\"centre_nm\":441,\"fwhm_nm\":10},{\"name\":\"green\",\"centre_nm\":549,\"fwhm_nm\":10},{\"name\":\"red\",\"centre_nm\":669,\"fwhm_nm\":10},{\"name\":\"nir\",\"centre_nm\":873,\"fwhm_nm\":40}],\"gsd_m\":{\"native\":3000},\"swath_km\":1556,\"notes\":\"NASA Earthdata lists four spectral bands and up to 60 along-track viewing angles; NASA PACE mission page lists 2-day global coverage and 1556 km nadir swath.\"}"}
- **relevance**: in-scope

## Editorial
HARP2 is a wide-angle hyper-angular imaging polarimeter carried on PACE for aerosol, cloud, land, and water-surface polarimetric observations.[^nasa-pace-harp2] It measures four VNIR bands centred at 441, 549, 669, and 873 nm, with 10 nm bandwidths for the blue, green, and red bands and a 40 nm bandwidth for the near-infrared band.[^nasa-pace-harp2] Each band measures three angles of linear polarization, and the instrument provides up to 60 along-track views, with 60 views at 669 nm and 10 views in the other three bands.[^nasa-pace-harp2] The field of view is 94 degrees cross-track and +/-57 degrees along-track.[^nasa-pace-harp2] Coverage is two days globally at 2.6 km resolution; the nadir-swath value is 1556 km, while a 2400 km swath figure is also published for HARP2.[^nasa-pace-harp2][^wmo-harp2] HARP2 performs multi-angle polarimetry demonstrated on PACE, supporting aerosol microphysical retrieval, cloud particle-property retrieval, and polarimetric surface observations.[^nasa-pace-harp2]

## Compositional position
- pace (missions) --[mission_payloads]--> Hyper-Angular Rainbow Polarimeter 2

## Sources
- [nasa-pace-harp2] | NASA PACE: HARP2 Polarimeter | https://pace.oceansciences.org/harp2.htm | tier=agency-doc | accessed=2026-06-16
- [wmo-harp2] | WMO OSCAR instrument record: HARP2 | https://space.oscar.wmo.int/instruments/view/harp2 | tier=agency-doc | accessed=2026-06-16

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Source: https://eo-atlas.org/products/sensor/harp2
Maintainer: SpectraWorks B.V. (CC-BY 4.0)