# Infrared Multispectral Scanner - 2
*sensor . products*

Four-channel NIR/SWIR/MWIR/TIR infrared multispectral scanner carried by HJ-2A for disaster-monitoring land observation, with 720 km swath and 48 m resolution.

## Specifications
- **product status**: operational
- **deployment context**: orbital
- **manufacturer**: cast
- **sensor**: {"instrument_family":"passive-optical","measurement_principle":"passive","spectral_range_nm":{"min":750,"max":12500},"spectral_band_count":4,"gsd_m":{"native":48},"swath_km":720,"channels":[{"name":"NIR/SWIR/MWIR/TIR","spectral_range_nm":{"min":750,"max":12500},"spectral_band_count":4,"gsd_m":{"native":48}}]}
- **entity type**: sensor
- **last verified date**: 2026-06-16
- **verified by**: agency-doc
- **claim status**: agency-sourced
- **provider**: cast
- **attributes**: {"kind":"sensor","product_status":"operational","deployment_context":"orbital","manufacturer":"cast","description":"Four-channel NIR/SWIR/MWIR/TIR infrared multispectral scanner carried by HJ-2A for disaster-monitoring land observation, with 720 km swath and 48 m resolution.","sensor":"{\"instrument_family\":\"passive-optical\",\"measurement_principle\":\"passive\",\"spectral_range_nm\":{\"min\":750,\"max\":12500},\"spectral_band_count\":4,\"gsd_m\":{\"native\":48},\"swath_km\":720,\"channels\":[{\"name\":\"NIR/SWIR/MWIR/TIR\",\"spectral_range_nm\":{\"min\":750,\"max\":12500},\"spectral_band_count\":4,\"gsd_m\":{\"native\":48}}]}"}
- **relevance**: in-scope

## Editorial
Infrared Multispectral Scanner - 2 (HJ) is a four-channel passive optical radiometer for HJ-2 wide-swath infrared imaging. It covers NIR, SWIR, MWIR and TIR spectral regions from 750 nm to 12.5 um, uses pushbroom scanning, and provides a 720 km swath with a four-day global coverage cycle.[^wmo-irmss2-hj][^ceos-irmss2-hj] Spatial resolution is given as 48 m at the sub-satellite point and as a paired 48/96 m infrared imaging capability in HJ-family material.[^wmo-irmss2-hj][^cast-optical-remote-sensing] On HJ-2A observations, the instrument has demonstrated land-surface-temperature and emissivity retrieval, sea-surface-temperature retrieval and thermal-anomaly detection use cases.[^wmo-irmss2-hj]

## Compositional position
- hj-2a (missions) --[mission_payloads]--> Infrared Multispectral Scanner - 2

## Sources
- [wmo-irmss2-hj] | WMO OSCAR instrument record: IRMSS-2 (HJ) | https://space.oscar.wmo.int/instruments/view/irmss_2_hj | tier=agency-doc | accessed=2026-06-16
- [ceos-irmss2-hj] | CEOS MIM instrument summary: IRMSS-2 (HJ-2) | https://database.eohandbook.com/database/instrumentsummary.aspx?instrumentID=1910 | tier=agency-doc | accessed=2026-06-16
- [wmo-hj2a] | WMO OSCAR satellite record: HJ-2A | https://space.oscar.wmo.int/satellites/view/hj_2a | tier=agency-doc | accessed=2026-06-16
- [cast-optical-remote-sensing] | CAST optical remote sensing satellites: HJ family | https://www.cast.cn/english/channel/2021 | tier=operator-engineering | accessed=2026-06-16

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Source: https://eo-atlas.org/products/sensor/irmss-2-hj
Maintainer: SpectraWorks B.V. (CC-BY 4.0)