Comparison of Msg Dense Atmospheric Motion Vector Fields Produced by Different Methods

This presentation is one of the first intercomparisons between vector fields representing atmospheric motions produced by different methods. Several methods extracting dense motion vector fields based mainly on optical flow techniques have been applied to a dataset of Meteosat Second Generation (MSG) images. The resulting vector fields have then been compared to sparse reference atmospheric vector (AMV) fields calculated with a block-matching (correlation-type) method. Analysed winds are used as complementary data for height assignment or for verification. All the presented methods produce visually consistent vector fields, smoother than the non-dense reference fields. But the high density of vectors is obtained at the cost of losing some outliers (consistent vectors at smaller scales), and having vectors of smaller intensity in average. Differences between results will also be interpreted in relation to the corresponding methods.