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    24-Jul-2014
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MIPAS Data Formats Products
Records
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
MIP_NLE_2P SPH
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
Glossary
References
Glossaries of technical terms
Level 2 processing
Pointing
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
Calibration
Latency, throughput and data volume
Auxiliary products
Level 2
Instrument specific topics
Algorithms and products
Level 2 products and algorithms
Products
The retrieval modules
Computation of cross-sections
Level 1b products and algorithms
Products
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
Services
Site Map
Frequently asked questions
Glossary
Credits
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2.4.3.2 Products

2.4.3.2.1 High level organisation

Level 1b products consist of formatted geolocated, radiometrically and spectrally calibrated spectra of atmospheric radiance. It also includes ILS data, identifiers for the various correction and calibration processes and data quality control indicators. The structure of the Level 1b products is described on the following diagram:
 
 

image
Figure 2.18 Level 1b data product structure

The main elements of the level 1b product are:

  • The Product header
  • The Summary quality ADS
  • The Geolocation ADS
  • The Structure ADS
  • The Level 1B measurement data set
  • The Scan info ADS
  • The Offset calibration ADS
  • The Gain calibration ADS#1 and ADS#2
  • The ILS and Spectral Calibration GADS
  • The LOS Calibration GADS
  • The Processing parameters GADS
The current detailed structure of the level 1b data product can be found here 6.2.1. .
 

2.4.3.2.2 Product header

The product header is divided into three parts:

2.4.3.2.2.1 Main product header

The main product header is the same for all ENVISAT products. It specifies basic product information such as origin of data, processing site, processing software version, UTC time of data sensing and processing, orbit and velocity parameters of ENVISAT, quality indicators for input data, etc.
The current detailed structure of the MPH can be found here 6.5.1. .

2.4.3.2.2.2 Specific product header

The SPH contains the information applicable to the whole Level 1b product file such: The current detailed structure of the SPH can be found here 6.5.38. .

2.4.3.2.2.3 Data set descriptor

The DSD provide information on structure and size of included or referenced measurement and annotation data.

2.4.3.2.3 Summary quality ADS

This ADS contains notes on the quality of the data in the data product file. It is summary file that list the number of bad sweeps. It includes:
  • The number of corrupted sweeps
  • The number of corrupted sweeps with instrument errors.
  • The number of corrupted sweeps with observational errors
  • The number of sweeps with a too large phase error
  • The number of sweeps for which the fringe count error in band B differs from band AB.
  • The number of sweeps for which the flux is out of range for one or more detectors.
The current detailed structure of this ADS can be found here 6.5.35. .

2.4.3.2.4 Geolocation ADS

This ADS contains information on the geolocation of the product. It includes:
  • ZPD time of the first, last and sweep closest in time to the center of the scan.
  • WGS84 latitude and longitude of the first, last and sweep closest in time to the center of the scan.
The current detailed structure of this ADS can be found here 6.5.32. .

2.4.3.2.5 Structure ADS

This ADS gives information about the size and organization of the MDSR of the data product. It is separated into various ADSR, each referring to a given MDSR. Each includes:
  • Number of sweep in current elevation scan
  • Number of point in NESR vector
  • Number of spectral peaks fitted during spectral calibration
  • Size of blocks used in spectral calibration
The current detailed structure of this ADS can be found here 6.5.36. .

2.4.3.2.6 Level 1b measurement data set

This part of the data product, is the part that contains the actual level 1b product. The level 1b MDS is a series of structured measurement data set records (MDSR). Each MDSR corresponds to an individual scene measurement (single sweep). The MDSR contain  a time stamp, the specific header for the sweep and the radiometrically and spectrally and locally calibrated spectra in the five spectral bands of MIPAS.

Each MDSR contains:

  • ZPD time of the sweep
  • Sweep ID number and relative number is elevation scan
  • The position of the spacecraft at ZPD time of that sweep
  • The azimuth and elevation angles of that sweep
  • The rate of variation of the altitude of the target
  • The geodetic latitude and longitude of the tangent point of that sweep
  • Validity and quality flags
  • Instrument mode
  • Number, position and relative intensity of detected spikes
  • Number of detected and corrected fringe count errors
  • Doppler stretching applied
  • Sweep direction (forward or reverse)
  • Interferogram minimum and maximum values at ADC for each detector (used by non-linearity correction 2.4.3.1.10. algorithm)
  • The spectral data points of bands A, AB, B, C and D in W cm-2 sr-1 cm (real part of the radiometrically and spectrally and locally calibrated spectral radiance).


The current detailed structure of the Level 1b MDS can be found here 6.5.37. .

2.4.3.2.7 Scan information ADS

This ADS gives information related to the instrument configuration during the elevation scans and level 1b processing issues. It includes:
  • Identification number of set of numerical filters used
  • Decimation factors per detector
  • Number of samples taken at the ADC (fringes counted)
  • Commanded (as opposed to actual) elevation and azimuth angles
  • Elevation scan number since last valid offset measurement
  • Solar time at target
  • Satellite and to target azimuth angle
  • Target to sun azimuth  and elevation angles
  • Date and time of scene used for spectral calibration
  • Linear spectral correction factor (not including Doppler effect) and its standard deviation
  • Number of peaks fitted during spectral calibration
  • For each peak:
    • identification number of microwindow
    • Exact wavenumber of reference line
    • Detected frequency shift
    • correlation coefficient
    • number of coadded scenes for spectral calibration
  • PAW gain scaling factor
  • NESR data
The current detailed structure of this ADS can be found here 6.5.33. .

2.4.3.2.8 Offset calibration ADS

This ADS contains the offset calibration measurement applied to the current data product as well as related information about this measurement. It contains:
  • Validity flag for each spectral band
  • Number of fringe count errors in gain calibration data
  • Sweep direction (forward or reverse)
  • For each band:
    • ZPD time of the first sweep
    • Decimation factors
    • Number of corrected spikes in interferogram
    • Position of corrected spikes in interferogram
    • Amplitude of corrected spikes in interferogram
    • Number of data point before decimation
    • Complex interferogram data
The current detailed structure of this ADS can be found here 6.5.34. .

2.4.3.2.9 Gain calibration ADS#1

This ADS contains the calibration gain applied to the current data product as well as related information about this measurement. It contains: The current detailed structure of this ADS can be found here 6.5.30. .

2.4.3.2.10 Gain calibration ADS#2

This ADS contains information about the radiometric accuracy. It contains:
  • Time of creation
  • Quality indicators
  • Sweep direction (forward or reverse)
  • For each spectral band:
    • number of points in band
    • first and last wavenumbers of data
    • mean of gain variation (cumulated with last valide gains) in W cm-2 sr-1 cm
    • standard deviation of gain variation (cumulated with last  valide gains) in W cm-2 sr-1 cm
The current detailed structure of this ADS can be found here 6.5.31. .

2.4.3.2.11 ILS and spectral calibration GADS

This GADS contains information on the spectral calibration and ILS retrieval. It contains:
  • Time of creation
  • ZPD time of the first sweep of scene used for ILS retrieval
  • Quality indicators for ILS retrieval
  • Level 1 b product file name that contains the data used for the ILS retrieval
  • Number of ILS retrieved
  • ILS parameters including:
    • microwindow identification number
    • wavenumber of the line used
    • number of coadded scenes
    • ILS parameters
  • ZPD time of the first sweep used for spectral calibration
  • Quality indicator for spectral calibration
  • Level 1 b product file name that contains the data used for the spectral calibration
  • Linear spectral correction factor (nor including Doppler effect) and its standard deviation
  • Number of fitted peaks
  • For each peak:
    • identification number of microwindow
    • Exact wavenumber of reference line
    • Detected frequency shift
    • correlation coefficient
    • number of coadded scenes for spectral calibration
The current detailed structure of this GADS can be found here 6.5.10. .

2.4.3.2.12 LOS calibration GADS

This GADS contains information on the LOS calibration. It contains:
  • Time of creation
  • Quality indicator
  • Angular frequency of first order harmonic pointing error (for x and y axis)
  • Estimated bias error (for x and y)
  • Estimated amplitude of first order harmonic error (for x and y)
  • Estimated phase of first order harmonic error (for x and y)
  • Variance of both estimated amplitude and phase of first order harmonic error (for x and y)'
  • Number of averaged orbits
The current detailed structure of this GADS can be found here 6.5.7. .

2.4.3.2.13 Processing parameters GADS

This GADS contains information on various elements of the level 1b processing. It includes:
  • Nominal metrology laser wavenumber
  • Number of points in each five bands
  • First and last wavenumber of each band
  • Number of points around the ZPD of band A and AB
  • Values of various rejection thresholds
  • Number of spectral blocks used for spike detection
  • Spectral calibration method used (CCM or PFM)
  • Simplex tolerance, maximum allowed number of iterations and initial guess values (for ILS retrieval).
  • ILS model parameters
  • Maximum and minimum azimuth angles in side observation geometry and in rearward observation geometry
  • Default yaw, pitch and roll angles, default mispointing angles and default mispointing rates (for LOS calibration)
  • The last modification time of various section in this file
The current detailed structure of this GADS can be found here 6.5.63. .

 
 

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