An automatic process for the atmospheric correction of image data from sensors in the spectral range 400 to 1000nm

摘要

An automatic process for the atmospheric correction of image data from sensors in the spectral range of 400 - 1000 nm, in which the following steps can be carried out:a) it is a masking of the dark reference surfaces in the image carried out with a combination of four threshold values and the following conditions rvi ≧ 3 and ρnir ≥ 0,10 and ρnir ≤ 0,25 and 0 ρred ≤ 0,04,(p - values from gl.3, set c of constraint - conditions) with rvi of the ratio - vegetation index is referred to, for which the following applies: rvi = ρ_nir/ρ_red, with red a red spectral channel (650 nm) and with nir a near-infrared spectral channel (850 nm) are referred to, and ρ_red and ρ_nir under the assumption of a given start - visual range (vis = 23 km) are calculated.b) it is the visual range vis with three or more vis - support points iterated, wherein as a result, at each iteration a certain percentage p of reference pixels as a proportion of the total number of the image pixels is calculated and due to the dependence of the..