In the movies and TV works of military genre, we often see commanders standing in front of a terrain model to discuss the battle plan. According to the topographic map, aerial photo or field terrain, and according to a certain proportion, the sand table model is a model made of sediment, war chess and other data.
Sand table model is divided into simple sand table model and permanent sand table model. The simple sand table model is made up of sand and wartime on the site. The permanent sand table model is made of foam plastic board (or three plywood), gypsum powder and pulp, etc., and can be stored for a long time. Sand table model has the characteristics of strong three-dimensional sense, intuitive image, simple manufacturing, economic and practical.
Sand table model has a wide range of uses. It can visually display the terrain of the combat area, and show the composition of the enemy and our positions, the deployment of military forces, weapons and equipment, etc. Military commanders often discuss terrain, enemy situation and operational plan, organize cooperative actions, implement tactical exercises, discuss operational cases and summarize operational experience. Sand table model is also often used to make models of economic development planning and large-scale engineering construction. Its image is intuitive and favored by decision makers and engineers.
In the aspect of psychotherapy and testing, sand table model is widely used to find and deal with mental problems. Under the guidance of the psychotherapist, the person who is being treated or tested sets up sand table model according to their own wishes, and the psychotherapist judges some mental problems according to the plot or appearance of the patient.