Cílem práce bylo vytvořit přehled teorie fuzzy množin a fuzzy logiky, jejich potenciálního využití v geografii a geoinformatice. V druhé části práce byly hodnoceny aktuální GIS softwary na míru implementace těchto prvků a byl sestaven přehled možných způsobů implementace. Jako doplněk byly provedeny dvě jednoduché analýzy s a bez využití fuzzy teorie množin pro srovnání všech možností a potenciálu fuzzy teorie množin v geoinformatice.The main aim of this diploma thesis was to create overwiev of implementation of fuzzy set theory and fuzzy logic in currently available GIS products. Second aim was to summarize theory of fuzzy sets and fuzzy logic as well as its use and potential in geography and geoinformatics. To reach the second goal study of literature was needed. Results of this studies are summarized in theoretical parts of this work. Practical results are identification of six possible aproaches of implementation of theory of fuzzy sets and fuzzy logic in GIS and detailed description of each of those aproaches with practical example. For each of those practical example quite detailed report about implementation and its positive and negative elements was created. Besides that some ideas for possible improvements were created for some implementations. All of thesis goals were reached and completed. This thesis in general provides overview of use of theory of fuzzy sets and fuzzy logic in geoinformatics.