Abstract
H. sosnowskyi (Heracleum sosnowskyi) is a plant that is widespread both in Lithuania and other countries and causes abundant problems. The damage caused by the population of the plant is many-sided: it menaces the biodiversity of the land, poses risk to human health, and causes considerable economic losses. In order to find effective and complex measures against this invasive plant, it is very important to identify places and areas where H. sosnowskyi grows, carry out a detailed analysis, and monitor its spread to avoid leaving this process to chance. In this paper, the remote sensing methodology was proposed to identify territories covered with H. sosnowskyi plants (land classification). Two categories of land cover classification were used: supervised (human-guided) and unsupervised (calculated by software). In the application of the supervised method, the average wavelength of the spectrum of H. sosnowskyi was calculated for the classification of the RGB image and according to this, the unsupervised classification by the program was accomplished. The combination of both classification methods, performed in steps, allowed obtaining better results than using one. The application of authors’ proposed methodology was demonstrated in a Lithuanian case study discussed in this paper.
Highlights
Invasive plants have turned into a global intractable problem both in Lithuania and other states
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The supervised classification goes through the following work steps: selection of training areas, generatiSounstaoinfabsiliitgy n20a20t,u1r2e, xfiFOleR,PaEnERdRcElVaIsEWsification of the features
Summary
Invasive plants have turned into a global intractable problem both in Lithuania and other states. One such plant is Heracleum sosnowskyi (H. sosnowskyi). In addition to being a menace to the biodiversity of the land, wide spread of said plant causes considerable economic losses and poses a risk to human health because the plant provokes the appearance of long-lasting burns on the skin. The H. sosnowskyi is an invasive alien species from the Caucasus. It is a biennial or a perennial plant. H. sosnowskyi does not appear in the lists of weedy flora of many Western European countries. It was described as a separate species by I. Mandenova in 1944 [2]
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