Overview

The Database for Imaging Multi-spectral Instruments and Tools for Radiometric Intercomparison (DIMITRI) manages L1 data from various medium resolution imagers over terrestrial targets chosen for their radiometric properties and/or the availability of in-situ radiometric measurements. DIMITRI comes with a suite of tools that allow comparison of the L1 data originating from various sensors in the database at Top Of the Atmosphere (TOA) level.

DIMITRI was initially prototyped at ESA/ESTEC. It is currently maintained by ESA, ARGANS and MAGELLIUM.

You can request the DIMITRI software below.


Software Tools

DIMITRI has a user-friendly interface for reading the database and making intercomparisons over these sites based on user-selection of a reference sensor, against which other sensors are compared. The software package contains a suite of IDL routines (it can be run with a free IDL run time license). DIMITRI can be used for the intercomparison of TOA radiance and reflectance values within the 400nm – 4μm wavelength range; this is generally known as Level 1b Earth Observation (EO) satellite data. DIMITRI offers the following capabilities and functionalities:

  • Product reader and data extraction routines
  • Comparison of satellite data based on user defined cloud screening parameters as well as temporal, spatial and geometric matching
  • Extracted Top of Atmosphere (TOA) reflectance time series and variability
  • Updated radiometric recalibration & bidirectional reflectance distribution function (BRDF) modelling
  • Rayleigh and Sun glint TOA intercomparison with modelled data
  • L1b auxiliary data extraction (e.g. ozone, water vapour)
  • Quicklook generation with Region of Interest (ROI) overlays
  • Automated & manual cloud screening of new products
  • CSV outputs and improved JPGs
  • Interactive Human-Machine Interface (HMI) and Data visualisation tool
  • Absolute angular matching criteria
  • Instrument spectral response comparison tool

More information can be found in the Software User Manual.

Montage of DIMITRI GUI

Screenshots of the DIMITRI interface


References

Sterckx, S., Adriaensen, S.; Dierckx, W.; Bouvet, M., 2016.PROBA-V in-flight radiometric performance : Status after 3 years in orbit, Living Planet Symposium 2016, Prague.

Bouvet, M., 2006. Intercomparisons of imaging spectrometers over the Salar de Uyuni (Bolivia). Proceedings of the Second Working Meeting on MERIS and AATSR Calibration and Geophysical Validation (MAVT-2006), 20-24 March 2006, ESRIN, Frascati, Italy (ESA SP-615, July 2006).VIEW

Bouvet, M., Goryl, P., Chander, G., Santer, R., & Saunier, S., 2007. Preliminary radiometric calibration assessment of ALOS AVNIR-2. Proceeding of the IGARSS 2007. VIEW

Bouvet, M., Ramoino, F., 2010. Radiometric intercomparison of AATSR, MERIS, and Aqua MODIS over Dome Concordia (Antarctica). Can. J. Remote Sensing, Vol. 36, No. 5, pp. 464-473. VIEW

Bouvet, M., 2014. Radiometric comparison of multispectral imagers over a pseudo-invariant calibration site using a reference radiometric model. Remote Sensing of Environment, No. 140, pp. 141-154. VIEW


Algorithm Theoretical Baseline Documents

Automated Cloud Screening in DIMITRI 3.0a VIEW

Automated Cloud Screening in DIMITRI 3.0b VIEW

Rayleigh Scattering Methodology for Vicarious Calibration VIEW

Radiometric monitoring using oceanic sites VIEW

Interband Vicarious Calibration over Sun glint VIEW

Band-to-band intercalibration using the sun glint over ocean VIEW

Sensor to simulation intercomparison over PICS VIEW

Radiometry monitoring using Desert sites VIEW


Miscelaneous

Private Section Access


ENTER

Last News

19/04/2016

DIMITRI V4.2 is now available. The additions to this version are as follows:

  • Integration of Sentinel-2a / MSI
  • Integration of Sentinel-3a / OLCI
  • Integration of Sentinel-3a / SLSTR
  • Integration of Landsat-8 / OLI
  • Correction of bugs

Sites, Location & Surface Type

DIMITRI employs user-defined sites for intercomparison purposes. Nonetheless, the following sites are pre-defined in the tool:

Algeria-3North AfricaDesert
Algeria-5North AfricaDesert
AmazonSouth AmericaVegetation
BoussoleLigurian SeaOcean
Dome-CAntarcticaIce/Snow
Libya-1North AfricaDesert
Libya-4North AfricaDesert
Mauritania-1North AfricaDesert
Mauritania-2North AfricaDesert
North East PacificPacific OceanOcean
North West AtlanticAtlantic OceanOcean
North West PacificPacific OceanOcean
South Indian OceanIndian OceanOcean
South Pacific GyrePacific OceanOcean
South West AtlanticAtlantic OceanOcean
Tuz GoluTurkeySalt lake
UyuniBoliviaSalt lake
DIMITRI Radiometric Target Sites

Radiometric Target Sites included in DIMITRI


Multi-spectral Instruments

ATSR2ERS-2ESA
AATSREnvisatESA
MERISEnvisatESA
VEGETATIONPROBA-VESA
MSISentinel-2ESA
OLCISentinel-3ESA
SLSTRSentinel-3ESA
MODISAquaNASA
OLILandsat-8NASA
POLDER-3PARASOLCNES
VEGETATION-2SPOTCNES
Montage of ERS-2, Envisat, Parasol Aqua and SPOT

Platforms carrying instruments included in DIMITRI


Accessing to DIMITRI

DIMITRI software is accessible under request, For that purpose, please, show your interest in the e-mail address available below, by clicking in the button.


Show e-mail address


Additional downloads

DIMITRI software requires further data to properly work. Apart from the tool (available under request), the following files are needed:

ERA/Interim Climatology data (last update: 19/05/2016 - 21 GB)
DOWNLOAD

AUX data files (last update: 19/05/2016 - 465 MB)
DOWNLOAD

LibRadTran 2.01 (last update: 19/05/2016 - 115 MB)
DOWNLOAD

OPAC Library for LibRadTran (last update: 19/05/2016 - 709 MB)
DOWNLOAD

Note that LibRadTran installation has external dependencies to be considered. Users shall go to this website for further details.


The Team

DIMITRI software is currently being developed and maintained by:

Marc BouvetTechnical OfficerESA/ESTEC
Manuel AriasProject ManagerARGANS
Bahjat AlhammoudSenior ScientistARGANS
Tom WattsSoftware EngineerARGANS
Beatrice BerthelotSenior ScientistMAGELLIUM
Gaël GouzienSoftware EngineerMAGELLIUM
John HedleySenior ScientistENVIROCS