## 5 Discussion  
Remote sensing methods offer the ability to derive objective information about vegetation in reclaimed areas [45; 46; 47; 48; 49; 50]. The automated detection and monitoring of aforested and forest succession areas in post-industrial grounds are vital based on the analyzed results of the reclamation process. Mapping land/land cover changes are also significant in terms of land degradation assessment and biomass monitoring for post-mining areas. The spatial parameters (2D and 3D metrics) and biometric features help forest phytocoenoses observation [51; 52; 53; 54]. A suitability assessment of vegetation is also important to create a forest on post-industrial grounds and solve the problem of the reconstruction and development when forming forests, according to their presence in the environment and the landscape [55; 56; 57; 58]. The development of vegetation and plant conditions in reclaimed areas provides the basic elements for assessing the dynamics of the restored, post-industrial ecosystem. Plant succession largely depends on the landscape soil formation process and its parameters (soil is the critical component that interacts with other elements of the forest ecosystem) [59]. In the assessment of the forest reclamation success, the following factors are used: the size of the area covered with vegetation and the time of its overgrowth. Ecology uses indicators related to the development of plant communities (e.g., biomass, community diversity, the abundance of species, forest species presence, and species abundance and share) [60; 61]. The differences between natural soil and technosols involve the lack of soil organic matter, frequent acidification or alkalization, salinity, heavy metal concentrations, compaction, disturbed quantitative ratios of macroelements, etc. Often, post-industrial areas are characterized by spatial variability and a significant dynamism of changes in the soil properties of newly formed habitats [61]. For these reasons, technogenic soils are often not able to meet the nutritional needs of the trees harmoniously [62]. The occurrence and degree of coverage in the reclaimed area by vegetation and the conditions of the trees are an important part of afforestation or natural succession. Moreover, the state of plant mineral nutrition is an important element in the evaluation of restoring ecosystems under post-industrial conditions. Vegetation entering succession or introduced as part of afforestation is an indicator of the success of reclamation. Studies of how the sulfur mine caused environmental changes in the analyzed area and how the reclamation treatments affect the afforestation vegetation growth were presented in previous studies [35; 36]. In the present study, precise information about actual LULC classes, especially the spatial range of the vegetation, was prepared using an image classification of the PlanetScope imageries. The former Jeziorko sulfur mine area showcases  
Figure 11: High vegetation: (**a**) histogram; (**b**) profile. a dynamic increase in its forested areas. Previous studies [43; 44; 63; 64; 65] based on analyses using Landsat 7 (2000), Landsat 8 (2013), and Sentinel-2 (2016) image classification, as well as orthophotomaps vectorization (2009), showed the general range and total value of forested grounds. Using the PlanetScope image analyses in this study, we obtained more precise information about the location, range, and percentage of the total value of forested areas. Forested grounds assumed a total value of around 95% in the research area, but around 35% of this value involves transitional woodland shrub, which indicates the ongoing process of forest succession and vegetation in the Jeziorko study area. Based on the ALS data analyses, we provided a precise tree canopy profile, and the vertical vegetation structure provided precise information according to the biomass of forested phytocoenoses.