This book presents a selection of high-quality, peer-reviewed papers from the 9th International Conference on Geoinformatics and Data Analysis (ICGDA 2026), held in Lyon, France, from April 13-15, 2026. This book covers a wide range of topics including Geospatial Data Analysis and Modeling, Geospatial Multimodal Data Analysis, Modeling Methods, and Security Management, Remote Sensing-based Spatial Data Analysis and Intelligent Communication Technologies, Geographic information retrieval, Theories and algorithms in GIS. It serves as an essential reference for researchers, scholars, and professionals working in the fields of geoinformatics and data analysis.