To have local information such as the level of precipitations, distribution of fauna, or the
To have local information such as the level of precipitations, distribution of fauna, or the demographic data integrated in the chart leads to a more effective analysis and a better decision making. In the age pre-electronics such a superposition of the data led to Dr. John Snow discovering the cause of the cholera. Today, it is employed by agencies as various as guards of nature and soldiers of fauna around the world.