Remote sensing involves acquiring information about the Earth's surface without direct contact using sensors to detect electromagnetic radiation. There are 7 steps in the remote sensing process: illumination, interaction with the atmosphere, interaction with the target, recording by sensors, transmission and processing, interpretation and analysis, and application. Remote sensing uses different parts of the electromagnetic spectrum and has many applications including mapping agriculture, forests, geology, hydrology, and land cover. It is used to monitor crops, estimate yields, assess forest health, explore for minerals and hydrocarbons, map wetlands and floodplains, and create land use maps.