We relate some subsets $G$ of the product $X\times Y$ of nonseparable Luzin (e.g., completely metrizable) spaces to subsets $H$ of $\mathbb{N}^{\mathbb{N}}\times Y$ in a way which allows to deduce descriptive properties of $G$ from corresponding theorems on $H$. As consequences we prove a nonseparable version of Kondô’s uniformization theorem and results on sets of points $y$ in $Y$ with particular properties of fibres $f^{-1}(y)$ of a mapping $f\: X\rightarrow Y$. Using these, we get descriptions of bimeasurable mappings between nonseparable Luzin spaces in terms of fibres.
This study presents the recommended documentation methodology in archaeological practice, heritage conservation and other fields relating to historical and cultural heritage. It tests various methods of digital documentation, in terms of their accuracy, time required, technology operator requirements, etc. It formulates rules for the creation of 3D models using multi-image photogrammetry, as the most effective method of digital documentation in archaeological practice. It presents a series of criteria to compare this method with other digital documentation procedures used in archaeological situations, at heritage sites and on artefacts. The recommended methodology was developed based on experience from research at the Great Moravian hillfort of Mikulčice-Valy and has been verified at a number of other sites.