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Progress in Earth and Planetary Science
Fig. 3 | Progress in Earth and Planetary Science

Fig. 3

From: Ground subsidence and polygon development due to thermokarst in the Lena-Aldan interfluve, eastern Siberia, revealed by satellite remote sensing data

Fig. 3

Visual comparison of a an orthorectified UAS image, and b a WorldView pansharpened image. Each red symbol indicates an identified polygon, and the white rectangle indicates the area in which the density of polygons was calculated. c, d, and e Procedure of spatial frequency analysis. An example of c a clipped panchromatic image, d an amplitude spectrum in 2D spatial domain, and e a 1D amplitude spectrum

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