Chapter 7
Unlike traditional two-dimensional GIS, which displays geographic information using length and width, 3D GIS adds height or elevation. This allows users to view geographic features from different angles and better understand their shapes, sizes, heights, and spatial relationships. Three-dimensional GIS uses X, Y, and Z coordinates to represent geographic features. The X and Y coordinates represent horizontal locations, while the Z coordinate represents elevation or height. This technology helps users understand geographic environments more realistically than traditional flat maps.
ArcGIS Scene Viewer is a web-based application used to create, explore, and share interactive 3D geographic scenes. Users can add geographic data layers, change symbols and colors, adjust elevation, view buildings in three dimensions, measure distances, and perform basic spatial analysis. Scene Viewer makes it possible to explore 3D geographic information through a web browser without requiring specialized desktop software. 3D GIS can also focus on mapping and visualizing the interior spaces of buildings. Another important topic is virtual reality, augmented reality, and extended reality. Virtual reality creates a computer-generated environment that allows users to experience a virtual world. Augmented reality adds digital information to the real-world environment, such as displaying underground utility pipes through a mobile device. Extended reality is a broader term that includes virtual reality, augmented reality, and mixed reality. These technologies can improve how people interact with geographic information and understand their surroundings.
Chapter 7 teaches how 3D Web GIS improves the way geographic information is displayed, understood, and analyzed. Understanding these concepts is important because 3D GIS provides more realistic visualizations and supports better decision-making in urban planning, construction, transportation, emergency management, and environmental studies.