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MIPAS Data Formats Products
2 MDSR per MDS 1 forward sweep 1 reverse sweep
2 MDSRs per MDS 1 forward sweep 1 reverse sweep
LOS calibration GADS
Spectral Lines MDS
P T Retrieval MW ADS
VMR Retrieval Parameters GADS
P t Retrieval GADS
Framework Parameters GADS
Processing Parameters GADS
Inverse LOS VCM matrices MDS
General GADS
Occupation matrices for vmr#1 retrieval MDS
MDS2 -- 1 mdsr forward sweep 1 mdsr reverse
Occupation matrices for p T retrieval MDS
General GADS
Priority of p T retrieval occupation matices
P T occupation matrices ADS
Summary Quality ADS
Instrument and Processing Parameters ADS
Microwindows occupation matrices for p T and trace gas retrievals
Scan information MDS
Level 2 product SPH
MDS1 -- 1 mdsr forward sweep 1 mdsr reverse sweep
H2O Target Species MDS
P T and Height Correction Profiles MDS
Continuum Contribution and Radiance Offset MDS
Structure ADS
Summary Quality ADS
Residual Spectra mean values and standard deviation data ADS
PCD Information of Individual Scans ADS
Instrument and Processing Parameters ADS
Microwindows Occupation Matrices ADS
Scan Information MDS
1 MDSR per MDS
Scan Geolocation ADS
Mipas Level 1B SPH
Calibrated Spectra MDS
Structure ADS
Summary Quality ADS
Offset Calibration ADS
Scan Information ADS
Geolocation ADS (LADS)
Gain Calibration ADS #2
Gain Calibration ADS #1
Level 0 SPH
DSD#1 for MDS containing VMR retrieval microwindows data
DSD for MDS containing p T retrieval microwindows data
VMR #1 retrieval microwindows ADS
P T retrieval microwindows ADS
1 MDSR per MDS
VMR profiles MDS (same format as for MIP_IG2_AX)
Temperature profiles MDS (same format as for MIP_IG2_AX)
Pressure profile MDS (same format as for MIP_IG2_AX)
P T continuum profiles MDS (same format as for MIP_IG2_AX)
GADS General (same format as for MIP_IG2_AX)
Level 0 MDSR
Values of unknown parameters MDS
Computed spectra MDS
Jacobian matrices MDS
General data
Data depending on occupation matrix location ADS
Microwindow grouping data ADS
LUTs for p T retrieval microwindows MDS
GADS General
P T retrieval microwindows ADS
ILS Calibration GADS
Auxilliary Products
MIP_MW1_AX: Level 1B Microwindow dictionary
MIP_IG2_AX: Initial Guess Profile data
MIP_FM2_AX: Forward Calculation Results
MIP_CS2_AX: Cross Sections Lookup Table
MIP_CS1_AX: MIPAS ILS and Spectral calibration
MIP_CO1_AX: MIPAS offset validation
MIP_CL1_AX: Line of sight calibration
MIP_CG1_AX: MIPAS Gain calibration
MIP_SP2_AX: Spectroscopic data
MIP_PS2_AX: Level 2 Processing Parameters
MIP_PS1_AX: Level 1B Processing Parameters
MIP_PI2_AX: A Priori Pointing Information
MIP_OM2_AX: Microwindow Occupation Matrix
MIP_MW2_AX: Level 2 Microwindows data
MIP_CA1_AX: Instrument characterization data
Level 0 Products
MIP_RW__0P: MIPAS Raw Data and SPE Self Test Mode
MIP_NL__0P: MIPAS Nominal Level 0
MIP_LS__0P: MIPAS Line of Sight (LOS) Level 0
Level 1 Products
MIP_NL__1P: MIPAS Geolocated and Calibrated Spectra
Level 2 Products
MIP_NLE_2P: MIPAS Extracted Temperature , Pressure and Atmospheric Constituents Profiles
MIP_NL__2P: MIPAS Temperature , Pressure and Atmospheric Constituents Profiles
Glossaries of technical terms
Level 2 processing
Miscellaneous hardware and optical terms
Spectrometry and radiometry
Data Processing
Alphabetical index of technical terms
Frequently Asked Questions
The MIPAS Instrument
Inflight performance verification
Instrument characteristics and performances
Preflight characteristics and expected performances
Subsystem description
Payload description and position on the platform
MIPAS Products and Algorithms
Data handling cookbook
Characterisation and calibration
Latency, throughput and data volume
Auxiliary products
Level 2
Instrument specific topics
Algorithms and products
Level 2 products and algorithms
The retrieval modules
Computation of cross-sections
Level 1b products and algorithms
Calculate ILS Retrieval function
Level 1a intermediary products and algorithms
Product evolution history
Definition and convention
MIPAS Products User Guide
Image gallery
Further reading
How to use MIPAS data?
Summary of applications and products
Peculiarities of MIPAS
Geophysical coverage
Principles of measurement
Scientific background
MIPAS Product Handbook
Site Map
Frequently asked questions
Terms of use
Contact us


Chapter 1
MIPAS Products User Guide

1.1 How to Choose MIPAS Data?

1.1.1 Geophysical measurements

MIPAS will be one of the atmospheric sensors on board ESA's polar orbiting ENVISAT to be launched towards the end of 2001. Operating in the mid-infrared (685 - 2410 cm-1, or 14.6 - 4.15 μm) it will provide a number of geophysical parameters relevant for the study of atmospheric chemistry, climatology and tropospheric/stratospheric exchange processes.

During nominal in-orbit operation MIPAS will routinely sense the atmospheric limb emission while the instrument's line-of-sight (LOS) is periodically varied in discrete steps, within a tangent height range of about 8 km to 68 km. For each height step a single interferometer stroke ('sweep') is performed whilst interferograms are recorded in the five spectral bands, A: 685 - 970 cm-1, AB: 1020 - 1170 cm-1, B: 1215 - 1500 cm-1, C: 1570 - 1750 cm-1, D: 1820 - 2410 cm-1. With a sweep measurement time of 4.45 s (high resolution, max. path difference = 20 cm), 16 tangent heights per scan and an orbit period of 100.6 minutes, typically 75 complete elevation scans will be acquired during each orbit. Scene measurements are interleaved by periodic radiometric offset ('deep space') measurements, in intervals of about 300 s. In addition, radiometric gain measurements, comprising sequences of blackbody target and deep space (D.S.) measurements, will be performed at approximately one week intervals.
The concept of the ENVISAT Payload Data Segment, PDS, foresees the routine generation and dissemination of calibrated, geolocated limb spectra (Level 1B products) and of so-called Level 2 data products. The latter covers vertical profiles of atmospheric pressure (p), temperature (T) as well as volume-mixing-ratio (VMR) profiles of the primary target species, O3, H2O, CH4, N2O, HNO3 and NO2. The table below provides a summary of MIPAS data products as well as auxiliary input data

Table 1.1 MIPAS Products Overview
Level 1B component
Product ID Description  Size
MIP_NL__0P MIPAS raw (source packet) data, time ordered.
Header and general quality information.
310 MBytes/ orbit
MIP_NL__1P Included Data Sets:

Calibrated limb radiance data in the five MIPAS spectral bands:
A: 685-970 cm-1. AB: 1020-1,170 cm-1. B: 1215- 1500 cm-1. C: 1570-1750 cm-1. D: 1820-2410 cm-1

Annotation data:
Geolocation data, product quality information, processing parameters, noise assessment data, offset calibration data.

320 MBytes/ orbit
MIP_xx1__AX  Auxiliary products:
* Calibration data (gain, offset validation, LOS, ILS)
* others (e.g., characterisation data).
* orbit state vector/attitude data.
 variable size
Level 2 component
MIP_NL__2P Vertical profiles of pressure, temperature, volume mixing ratio of O3, H2O, CH4, N2O, NO2 and HNO3.
Annotation data:
Geolocation data, product quality information, residual spectra, fitted continuum data, processing parameters, others
8.5 MBytes/ orbit
MIP_NLE_2P  Included Data Sets:
Vertical profiles of pressure, temperature, concentration of O3 and H2O.
Annotation data:
Geolocation data, product quality information, processing parameters, others.
8.5 MBytes/ orbit
MIP_xx2__AX   Auxiliary products
* Pre-tabulated cross-section, microwindows data, atmospheric profiles, pointing information, processing parameters
* ECMWF: Meteorology forecast data
variable size

Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry