# INSAT-3DR Sounder
*sensor . products*

Nineteen-channel INSAT-3DR geostationary infrared sounder for temperature and humidity profiles, stability indices, water vapour, and total column ozone.

## Specifications
- **product status**: operational
- **deployment context**: orbital
- **manufacturer**: isro
- **sensor**: {"instrument_family":"passive-optical","measurement_principle":"passive","spectral_range_nm":{"min":670,"max":14850},"spectral_band_count":19,"gsd_m":{"native":10000},"channels":[{"name":"SWIR/MWIR","spectral_range_nm":{"min":3740,"max":4580},"spectral_band_count":6,"gsd_m":{"native":10000}},{"name":"MIR/LWIR","spectral_range_nm":{"min":6510,"max":14710},"spectral_band_count":12,"gsd_m":{"native":10000}},{"name":"VIS","spectral_range_nm":{"min":670,"max":720},"spectral_band_count":1,"gsd_m":{"native":10000}}]}
- **entity type**: sensor
- **last verified date**: 2026-06-16
- **verified by**: agency-doc
- **claim status**: agency-sourced
- **provider**: isro
- **attributes**: {"kind":"sensor","product_status":"operational","deployment_context":"orbital","manufacturer":"isro","description":"Nineteen-channel INSAT-3DR geostationary infrared sounder for temperature and humidity profiles, stability indices, water vapour, and total column ozone.","sensor":"{\"instrument_family\":\"passive-optical\",\"measurement_principle\":\"passive\",\"spectral_range_nm\":{\"min\":670,\"max\":14850},\"spectral_band_count\":19,\"gsd_m\":{\"native\":10000},\"channels\":[{\"name\":\"SWIR/MWIR\",\"spectral_range_nm\":{\"min\":3740,\"max\":4580},\"spectral_band_count\":6,\"gsd_m\":{\"native\":10000}},{\"name\":\"MIR/LWIR\",\"spectral_range_nm\":{\"min\":6510,\"max\":14710},\"spectral_band_count\":12,\"gsd_m\":{\"native\":10000}},{\"name\":\"VIS\",\"spectral_range_nm\":{\"min\":670,\"max\":720},\"spectral_band_count\":1,\"gsd_m\":{\"native\":10000}}]}"}
- **relevance**: in-scope

## Editorial
INSAT-3DR Sounder is the mission's 19-channel geostationary atmospheric sounder, separate from the six-channel INSAT-3DR Imager [^mosdac-insat-3dr-payloads][^isro-insat-3dr]. It uses 18 infrared sounding channels plus one visible channel for cloud and Earth context, supporting temperature and humidity vertical profiles, atmospheric stability indices, water-vapour content, and total column ozone [^mosdac-insat-3dr-payloads][^wmo-insat-sounder]. The channel groups cover VIS 0.67-0.72 um, SWIR/MWIR 3.74-4.58 um, and MIR/LWIR 6.51-14.71 um; the same sounder class can place the rounded longwave limit near 14.85 um, without changing the 18-IR-plus-VIS configuration [^mosdac-insat-3dr-payloads][^wmo-insat-sounder]. Ground sampling is 10 km, with full-frame sounding every 3 hours; the 6000 km by 6000 km sounding area is listed at 160 minutes [^mosdac-insat-3dr-payloads]. This makes the instrument relevant for geostationary profile and stability products where vertical thermal and moisture information is more important than high-resolution scene imaging [^mosdac-insat-3dr-payloads].

## Compositional position
- insat-3dr (missions) --[mission_payloads]--> INSAT-3DR Sounder

## Sources
- [mosdac-insat-3dr-payloads] | MOSDAC INSAT-3DR payloads | https://www.mosdac.gov.in/insat-3dr-payloads | tier=agency-doc | accessed=2026-06-16
- [wmo-insat-sounder] | WMO OSCAR instrument record: INSAT Sounder | https://space.oscar.wmo.int/instruments/view/sounder_insat | tier=agency-doc | accessed=2026-06-16
- [isro-insat-3dr] | ISRO INSAT-3DR mission page | https://www.isro.gov.in/INSAT_3DR.html | tier=agency-doc | accessed=2026-06-16

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Source: https://eo-atlas.org/products/sensor/insat-3dr-sounder
Maintainer: SpectraWorks B.V. (CC-BY 4.0)