Abstract
Abstract. In the frame of the Copernicus program of the European Commission, Sentinel-2 is a constellation of 2 satellites with a revisit time of 5 days in order to have temporal images stacks and a global coverage over terrestrial surfaces. Satellite 2A was launched in June 2015, and satellite 2B will be launched in March 2017. In cooperation with the European Space Agency (ESA), the French space agency (CNES) is in charge of the image quality of the project, and so ensures the CAL/VAL commissioning phase during the months following the launch. This cooperation is also extended to routine phase as CNES supports European Space Research Institute (ESRIN) and the Sentinel-2 Mission performance Centre (MPC) for validation in geometric and radiometric image quality aspects, and in Sentinel-2 GRI geolocation performance assessment whose results will be presented in this paper. The GRI is a set of S2A images at 10m resolution covering the whole world with a good and consistent geolocation. This ground reference enables accurate multi-temporal registration of refined Sentinel-2 products. While not primarily intended for the generation of DSM, Sentinel-2 swaths overlap between orbits would also allow for the generation of a complete DSM of land and ices over 60° of northern latitudes (expected accuracy: few S2 pixels in altimetry). This DSM would benefit from the very frequent revisit times of Sentinel-2, to monitor ice or snow level in area of frequent changes, or to increase measurement accuracy in areas of little changes.
Highlights
As part of the Copernicus program of the European Union (EU), the European Space Agency (ESA) has developed and is currently operating the Sentinel-2 mission acquiring high spatial resolution optical imagery (Drusch, 2012)
The Sentinel-2 mission offers an unprecedented combination of systematic global coverage of land coastal areas from −56 ° to 84 ° latitude, a high revisit of five days under the same viewing conditions with the help of two identical Sentinel-2 satellites, high spatial resolution (10m-20m60m), and a wide field of view ( 290 km) for multispectral observations from 13 bands in the visible, near infrared and short wave infrared range of the electromagnetic spectrum
Europe GRI block was built during the S2A commissioning phase, L1B segments being selected par IQ geometric team at CNES, and delivered to IGN for refining, come back to CNES for validation of geolocation performance
Summary
As part of the Copernicus program of the European Union (EU), the European Space Agency (ESA) has developed and is currently operating the Sentinel-2 mission acquiring high spatial resolution optical imagery (Drusch, 2012). This paper intends to demonstrate the surprising capability of the Sentinel-2 mission for the generation of DSM (Michel, 2017), by taking the advantage of the large swath whose overlaps cover fractions of Earth surface, the area covered by overlaps increasing with the latitude until becoming complete starting at 60° of northern latitude (Figure 1). This way, the principle of stereo-restitution can be applied as deriving the height of a given point on Earth from remote sensing images. It requires at least two images where this point can be seen, with different viewing angles
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