## Data
### Habitat-Related Factors  
Habitat distributions of wild animals are influenced by the combined impacts of various factors. Environmental factors such as topographic characteristics, forest properties [22], and distance from  
Figure 2: Data obtained from field observations of (**a**) Martens; and (**b**) Leopard cats.  
essential factors to support life, such as water, influence the habitat distributions of mammals, including martens and leopard cats [22]. In this study, ground elevation, slope gradient, slope aspect, timber type, timber age, land cover, and distance from road, water, and forest were selected as factors influencing the habitat distributions of marten and leopard cat (Table 1 and Figure 3). The attribute information of the timber type of forest map is shown separately in Table 2, due to the limitation of the figure size. The determination and collection of factors were a fundamental component of mapping the potential habitats of these species. The factors were collected from nationally generated thematic maps and field investigations, such as those described in Section 2.1.  
A digital elevation model (DEM) was produced by generating a triangulated irregular network and digitizing the contours in 100-m intervals from topographical maps published by the National Geographic Information Institute. The slope gradient and slope aspect calculations were performed in ArcGIS 10.3. Thematic maps of forest and land cover were prepared at a 1:25,000 scale in a polygon format. The forest map was provided by the Korea Forest Service, and the timber type and age were prepared from this map. The land cover map was generated and published by the Ministry of Environment, South Korea. Land cover, distance from road, water, and forest were also calculated using ArcGIS.  
All factors were converted into a 100 m \(\times\) 100 m grid format to apply the ANN model. The row and column sizes of the study area were 6056 and 3533 cells, and the study area consisted of a total of 9,952,165 cells, except in the no data region, based on the DEM. The marten and leopard cat habitat data were converted from point formats into grid formats. Half of both the marten and the leopard cat habitat data were selected via random sampling as input data. The other half of the data were used for validation. Ultimately, all factors were collated into one input dataset with randomly extracted habitat sample data for both marten and leopard cat.  
\begin{table}
\begin{tabular}{c l c c} \hline
**Original Data** & **Factors** & **Data Type** & **Scale** \\ \hline Habitat & \begin{tabular}{c} Marten \\ Leopard cat \\ \end{tabular} & Point & - \\ \hline Topographical map a & \begin{tabular}{c} Ground elevation (m) \\ Slope gradient (\({}^{\circ}\)) \\ Slope aspect \\ \end{tabular} & GRID & 1:5000 \\ \hline Forest map b & \
\begin{tabular}{c} Timber type \\ Timber age \\ \end{tabular} & Polygon & 1:25,000 \\ \hline Land cover map c &
\begin{tabular}{c} Land cover \\ Distance from road (m) \\ Distance from water (m) \\ Distance from forest (m) \\ \end{tabular} & Polygon & 1:25,000 \\ \hline \end{tabular}  
* The digital topographic map by National Geographic Information Institute (NGII); b The forest map published by Korea Forest Service (KFS); c The land use map offered by the Korea Ministry of Environment.  
\end{table}
Table 1: Data layers related to marten and leopard cat habitat.  
Figure 3: Factors related to the habitat potentials of marten and leopard cat: (**a**) ground elevation, (**b**) slope gradient, (**c**) slope aspect, (**d**) timber type, (**e**) timber age, (**f**) land cover, (**g**) distance from road, (**h**) distance from water, and (**i**) distance from forest.