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The observation is done from colatitude θ0 and longitude ϕ0, in the Earth-bound xyz referential. A camera-bound referential is defined, with the Z axis along the camera boresight (roughly towards the zenith), the Y axis along the shorter dimension of the camera image, approximately pointing North, and the X axis along the longer dimension of the camera image, pointing East.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.