When making the KLIMATEXT Atlas, geographic information systems (GIS) were employed, i.e. methods and tools allowing efficient analysis and visualisation of three-dimensional data. That would not be in itself possible without prior detailed study of the problem particularly from the point of view of (geo)statistics, climatology and other geographical disciplines. The process of creating the atlas thus comprised several stages: 1. Comparative study of available atlases (especially Bundesrepublik Deutschland Nationalatlas, Atlas Śląska Dolnego i Opolskiego and Atlas podnebí Česka), 2. Identification of the target group, focus and determining the contents of the atlas, 3. Identification, acquirement and pre-processing of the data, 4. (Geo)statistical processing, analysis and evaluation of results, 5. Cartographic processing, interpretation, graphic design and editing. The making of the atlas was consulted with experts in the given fields during all these stages. The sources of the data for making maps of precipitation conditions in the region were meteorological institutions in the given countries (the Czech Hydrometeorological Institute, Germany’s Reference for Meteorology and the Polish Institute of Meteorology and Water Management - National Research Institute). Topographical data were taken mainly from the project OpenStreetMap (www.openstreetmap.org) and the elevation model of the territory is based on the data of the Shuttle Radar Topography Mission with spatial resolution of 90×90 metres. If other data were used during the process of mapmaking, the source is stated on the given page.