Full context:   In another approach to the abovementioned four traditions, geography is organized into applied branches. The UNESCO Encyclopedia of Life Support Systems organizes geography into the three categories of human geography, physical geography, and technical geography. Some publications limit the number of branches to physical and human, describing them as the principal branches. Human geography largely focuses on the built environment and how humans create, view, manage, and influence space. Physical geography examines the natural environment and how organisms, climate, soil, water, and landforms produce and interact, studying spatial patterns in the natural environment, atmosphere, hydrosphere, biosphere, and geosphere. The difference between these approaches led to the development of integrated geography, which combines physical and human geography and concerns the interactions between the environment and humans. Technical geography involves studying and developing the tools and techniques used by geographers, such as remote sensing, cartography, and geographic information system. It is the newest of the branches, and often other terms are used in the literature to describe the emerging category. While human and physical geographers use the techniques employed by technical geographers, technical geography is more concerned with the fundamental spatial concepts and technologies than the nature of the data. It is therefore closely associated with the spatial tradition of geography while being applied to the other two major branches. These branches use similar geographic philosophies, concepts, and tools and often overlap significantly, so geographers rarely focus on just one of these topics, often using one as their primary focus and then incorporating data and methods from the other branches. Often, geographers are asked to describe what they do by individuals outside the discipline and are likely to identify closely with a specific branch, or sub-branch when describing themselves to lay people.