1 Anikeeva I.A.

Roscartography, JSC

The main characteristics of aerial- and space imagery, obtained for mapping purposes, are the distinct details transferring and sharpness, which determine their visual properties. The sharpness of aerial- and space images affects the accuracy of measurements made on them, as well as the quality products obtained. The ability of the image to transfer fine details is separately determined by its actual spatial resolution. It is shown that the actual resolution does not completely represent the structural-and-geometric characteristics of the images’ fine quality. Calculations showing that neither actual spatial resolution nor the gradation characteristic “local contrast” make it possible to evaluate its sharpness are presented. The author proposes a method of numerically image sharpness assessing, based on the gradient characteristic of the edge profile curve. The advantage of this method in comparison with alternative ones is shown. The general form of the image sharpness criteria calculating formula for any radiometric resolution is given. The proposed method enables obtaining a normed value, varying from 0 to 1, which provides obvious interpretability of the result. The permissible value of the sharpness index of aerial and space imagery obtained for mapping is determined. Examples of images obtained by an aerial survey complex based on a light drone, as well as those obtained by a remote sensing spacecraft, satisfying the established acceptable sharpness criteria, are given. The correspondence of obtained numerical estimates to the visual perception of the image sharpness is shown.
I would like to thank JSC Ural-Siberian Geoinformation Company, in particular it’s chief engineer Elena Kobzeva, for the aerial images provided for the experiment and assistance in the idea of evaluating the photographic sharpness of images
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Anikeeva I.A., 
(2020) Sharpness indicator of aerial- and space images obtained for mapping purposes. Geodesy and cartography = Geodezia i Kartografia, 81(6), pp. 35-44. (In Russian). DOI: 10.22389/0016-7126-2020-960-6-35-44
Publication History
Received: 10.12.2019
Accepted: 01.06.2020
Published: 20.07.2020


2020 June DOI:

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