61 research outputs found
Operational data quality control and instrument monitoring for the spectral, radiometric and geometric data properties within the EnMAP Ground Segment
EnMap In-flight Calibration Status
The Environmental Mapping and Analysis Program (EnMAP) hyperspectral satellite mission was successfully launched on 1st April 2022. The mission aims to monitor and characterise Earth’s environment in the spectral range from 420 - 2450 nm. The VNIR sensor provides 91 science channels ranging from 420 - 1000 nm with an average Spectral Sampling Distance (SSD) of 6.5 nm. While the SWIR sensor covers the range from 900 - 2450 nm with 131 channels and 10nm SSD. - The off-nadir pointing capability (up to 30 degrees) enables 5000 km to be monitored per day, with a swath width of 30 km and a spatial resolution of 30 m. The EnMAP satellite is equipped with several subsystems which allow periodic in-flight monitoring and calibration. The Full Aperture solar Diffuser Assembly (FADA) is used for absolute radiometric calibration. The On-Board Calibration Assembly (OBCA) is composed of 2 integrating spheres: one is coated with a doped diffuser material and is used for the spectral calibration; the second sphere, coated with a white spectralon, is used for Radiometric stability monitoring. Linearity LEDs are placed in front of the detector to monitor their linearity by measuring the response at constant illumination with increasing integration times. The Shutter Calibration Mechanism (SCM) allows for measurements with no light input to be performed in order to compute Dark Signal values and, in combination with Deep Space measurements, to compute any existing shutter emission in the SWIR range. This contribution will present a summary of the calibration activities performed during the EnMAP Commissioning Phase
Analysis Ready Data (ARD) for DESIS and EnMAP - Ensuring the Data Quality within the Ground Segments
First year EnMAP radiometric performance based on scenes over RadCalNet and PICS sites
The radiometric performance of EnMAP is presented based on scenes over RadCalNet and PICS sites acquired during the first year since launch. The results show the typical accuracy and stability attainable by EnMAP radiometric products
Analysis-Ready Data from Hyperspectral Sensors - The Design of the EnMAP CARD4L-SR Data Product
Operational quality control for spaceborne hyperspectral sensors examples for the spectral performance assessment of DESIS and EnMAP
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