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
Sites
DIMITRI employs user-defined sites for intercomparison purposes. Nonetheless, the following sites are pre-defined in the tool:
SiteLocationSurface TypeAlgeria-3North AfricaDesertAlgeria-5North AfricaDesertDome-CAntarticaIce/snowGONAAfricaDesert SmallLibya-1North AfricaDesertLibya-4North AfricaDesertLibya-4 smallNorth AfricaDesertMauritania-1North AfricaDesertMauritania-2North AfricaDesertNorth East PacificPacific OceanOceanNorth West AtlanticAtlantic OceanOceanNorth West PacificPacific OceanOceanSouth Indian OceanIndian OceanOceanSouth Pacific GyrePacific OceanOcean
Multi-Spectral Instruments
SensorMissionAgenceATSR2ERS-2ESAAATSREnvisatESAMERISEnvisatESAVEGETATIONPROBA-VESAMSISentinel-2ESAOLCISentinel-3ESASLSTRSentinel-3ESAMODISAquaNASAOLILANDSAT-8NASAPOLDER-3PARASOLCNESVEGETATION-2SPOTCNESVIIRSNPPNASA
Algorithm Theoretical Baseline Documents
Automated Cloud Screening in DIMITRI 3.0aAutomated Cloud Screening in DIMITRI 3.0bRayleigh Scattering Methodology for Vicarious CalibrationRadiometric monitoring using oceanic sitesInterband Vicarious Calibration over Sun glintBand-to-band intercalibration using the sun glint over oceanSensor to simulation intercomparison over PICSRadiometry monitoring using Desert sites