Envisat SCIAMACHY Geo-located atmospheric spectra [SCI_NL__1P]

How to Access Data

Reprocessed Data V8: Full mission is available via FTP upon completing an Access Request

Access to the Level 1b v7.04 products has been disrupted since November 2016. Users are recommended to use the latest reprocessed dataset (v8). See SCIAMACHY products availability table

For further information about the EO Sign In Service you can visit TellUs

Should you need support please contact EOHelp



This data product covers geo-located, radiometrically and spectrally calibrated limb and nadir radiance spectra for Nadir, Limb, and Occultation measurements with additional monitoring and calibration measurements. The Level 1b product is the lowest level of SCIAMACHY data delivered to the users.

The instrument Instantaneous Field of View (IFoV) is approximately 0.045 deg (scan direction) x 1.8 deg (flight direction). This corresponds to a ground pixel size of 25 Km x 0.6 km at the sub-satellite point (nadir) and of 103 km x 2.6 km at the Earth's horizon (limb).

Nadir measurements have a maximum swath width of 960 km (in scan direction) and a typical footprint of 30 km (along track) x 60 km (across track).

Limb measurements have a tangent height range spanning from 0 to 100 km with 3 km vertical resolution. Azimuth scans are performed for constant elevation angle, typically 34 elevation steps per limb scan.

Maximum azimuth range is +/- 44 deg relative to S/C velocity (Note that the azimuth range is adjusted to observe the same atmospheric volume as for nadir measurements within five minutes).

The radiometric resolution is 16 bits, with a spectral resolution of 0.24 nm to 1.5 nm, depending on the spectral range. The Sun normalized radiometric accuracy is 2 to 3% in unpolarized light, and 3 to 4% in polarized light. The relative radiometric accuracy is less than 1% and the spectral accuracy spans form 0.005 nm to 0.035 nm.

Individual measurements from dedicated monitoring states include:

  • Sun over diffuser
  • Subsolar calibration
  • Spectral lamp measurements
  • White light source measurements
  • Elevation mirror monitoring (Sun/Moon)
  • ADC calibration

Level 1b products are corrected for degradation applying a scan mirror model and m-factors.The latest Level 1b dataset is version 8.0X.



Spatial coverage: 
90 N, -90 S, -180 W, 180 E
Temporal coverage:
2002-08-02 - 2012-04-08
Date of launch:
Mission status:
Orbit height:
800 km
Orbit type:
Swath width:
5 - 1150 km


level 1b


Utilisation of this data is subject to ESA's Earth Observation Terms and Conditions



SCIAMACHY auxiliary data
Auxiliary Data
Envisat SCIAMACHY Sensor Performance, Products and Algorithms
Product Information
SCIAMACHY Product Handbook
User Manual
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Product Specifications
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