DIMITRI

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.

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.

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

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 Desert-PICS VIEW

Radiometry monitoring using Desert sites VIEW

Sensor to simulation intercomparison over Snow-PICS VIEW

Interband Vicarious Calibration over Deep Convective Cloud VIEW

Radiometry monitoring over Deep Convective Cloud VIEW

Private Section Access

30/01/2024

DIMITRI V4.7.0 is available now. The additions to this version are as follows:

• Vicarious Calibration methods over DCC and SNOW
• Synthesis-Plots unit of the calibration methods
• Integration of installation testing unit
• Integration of Sentinel-2a/b/c/d / MSI
• Integration of Sentinel-3a/b/c/d / OLCI
• Integration of Sentinel-3a/b/c/d / SLSTR
• Integration of Landsat-8/9 / OLI
• Correction of bugs

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

Algeria-3	North Africa	Desert
Algeria-5	North Africa	Desert
Amazon	South America	Vegetation
Boussole	Ligurian Sea	Ocean
Dome-C	Antarctica	Ice/Snow
Libya-1	North Africa	Desert
Libya-4	North Africa	Desert
Mauritania-1	North Africa	Desert
Mauritania-2	North Africa	Desert
North East Pacific	Pacific Ocean	Ocean
North West Atlantic	Atlantic Ocean	Ocean
North West Pacific	Pacific Ocean	Ocean
South Indian Ocean	Indian Ocean	Ocean
South Pacific Gyre	Pacific Ocean	Ocean
South West Atlantic	Atlantic Ocean	Ocean
East Mediterranean	Mediterranean Sea	Ocean
Maldives	Maldives Zone	Cloud
Indonesia	Indonesian Zone	Cloud
RadCalNet	World wide	Desert/Vegetation
Tuz Golu	Turkey	Salt lake
Uyuni	Bolivia	Salt lake

ATSR2	ERS-2	ESA
AATSR	Envisat	ESA
MERIS	Envisat	ESA
VEGETATION	PROBA-V	ESA
MSI	Sentinel-2	ESA
OLCI	Sentinel-3	ESA
SLSTR	Sentinel-3	ESA
MODIS	Aqua	NASA
OLI	Landsat-8	NASA
POLDER-3	PARASOL	CNES
VEGETATION-2	SPOT	CNES

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.

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

Quicklook for TDS/DB links (last update: 14/12/2023 - 73 KB)

DOWNLOAD

AUX data files (last update: 13/06/2023 - ~2 GB)

DOWNLOAD

LibRadTran 1.7 ( 60 MB)

DOWNLOAD

OPAC Library for LibRadTran ( 835 MB)

DOWNLOAD

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