Free and open source software (FOSS) for web mapping has progressed rapidly in the past decade, providing a variety of tools for tiled map making. Tiled maps increase the speed at which map clients are able to fill the map view for users, enhancing the user experience. In this thesis the development of an automated map generation process for three varying types of multi-scale tiled raster maps, covering the area of Finland, is presented. The aim of the study was to provide insight on tiled map making with FOSS, answering questions such as; how the process can be built from existing FOSS products; what decisions are required to be made and what challenges are encountered during the development of the process; and, how can tiles from different areas of maps be rendered simultaneously without affecting the final outcome. Rendering tiles from different areas simultaneously with several hardware instances decreases the overall rendering time.The theoretical and technical background of tiled map making was first reviewed. The development of the map generation process was then planned and the source data was reviewed. In the first stage of the development, a system that renders tiles, but does not include any map type specific elements, was built. In the second stage of the development, the map type specific map production flow lines were added to the map generation process, including data processing operations and stylesheets. In the third and final stage of the development the process was qualitatively evaluated. The finished map generation process first transforms the source data to a form where it can be used directly for rendering maps with multiple data processing operations. The tiles are then rendered, and each tile is stored as a separate file in a folder structure. The development of the process revealed that building data processing operations take up the majority of the time that is used for the development. The slowest parts of the finished map generation process is transforming digital elevation models to hillshading and contour lines, and rendering the tiles. These two parts of the process were divided geographically into forty areas that can be processed separately without affecting the maps that are generated. The process should be developed further to generate hillshading, contour lines, and tiles faster, for example, by moving these processes to multiple hardware instances.
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