While the main focus of numerous engineering-geological investigations is to determine load-bearing capacity and settlement in engineering structures, this article aims to point at the specificity of sewer system engineering-geological investigations, which focuses on workability of soils and rocks. The study deals with workability class assessment of seven different sewer system localities. The significance of this research lies in the mutual comparison of workability class assessment of these seven localities in terms of two different workability standards. Each of the standards represents an independent model of assessment and classification of workability. The first standard (CSN 73 1001) classifies soils and rocks into seven workability classes, while the second (EN ISO 14688) comprises only three workability classes. Each of the approaches has its advantages and disadvantages. In comparison to the first one, the second standard permits faster and easier classification of rocks, but may be less fair to investors or developers when considering the real engineering-geological conditions and costs of implementation. Rocks were newly classified into three (easy, medium and difficult) categories of earthwork realization difficulty. In the study, 33 layers were classified in the category of easy realization of earthworks, 8 layers in the category of a medium degree of earthwork realization difficulty, and two layers in the category of a difficult realization of earthworks.

Dividing large areas into smaller sub-areas is a common practice across many disciplines, with specific requirements determined by their intended use. This study focuses on preparing search sectors for locating missing persons in non-urban environments. In such settings, search teams must be assigned sufficiently large yet homogeneous sectors that allow visual orientation even without GNSS. While general search strategies differ in their approach to area coverage, rural and wilderness environments pose unique challenges that demand a systematic method to ensure both navigability and efficiency. To address this, we propose a land-use-based approach that incorporates the artificial extension of linear geo-features to subdivide large polygons. The methodology was first applied to regions of the Czech Republic in 2020 and refined with advanced settings in 2023. Introducing the step for subdividing extensive homogeneous polygons significantly improved outcomes, allowing the method to generate search sectors of the desired size for 86% of the territory in 2020 and 91% in 2023. The main limitation lies in the reliance on cartographic data, which may omit fine details critical for field navigation.

The D1 Paskov spoil heap is a smaller brownfield covering an area of 71,188 m², located in the former Paskov mining region. It serves as a model area for reclamation planning, based on a comprehensive assessment of its natural conditions and the risks posed by contamination from hazardous elements and erosion processes. Data for this assessment was collected through field research conducted between 2023 and 2025. In September 2023, additional fieldwork and mapping were carried out using unmanned aerial vehicles equipped with two types of sensors: an RGB camera and LiDAR. The dump is primarily covered with ruderal vegetation, with the summit plateau dominated by the expansive grass species Calamagrostis epigejos. With appropriate management, the plant communities on the western and northern slopes have the potential to develop into conservation-significant habitats. However, the southwestern slope presents challenges due to active rill erosion and contamination. Stabilization measures are required to prevent further degradation in this area.