Radiometry is the scientific field that deals with the measurement of electromagnetic radiation, including visible light, infrared, ultraviolet, and radio waves.
Radiometry is important because it allows us to accurately measure and quantify the amount of electromagnetic radiation in different types of environments, which is crucial for understanding various physical and biological processes.
Radiometry has a wide range of applications, including remote sensing, meteorology, astronomy, medical imaging, and environmental monitoring.
Radiometry measures all wavelengths of electromagnetic radiation, while photometry only measures visible light. Radiometry also takes into account the energy of the radiation, whereas photometry measures the perceived brightness of light.
Some good online sources for learning about radiometry include the National Oceanic and Atmospheric Administration (NOAA) website, the National Aeronautics and Space Administration (NASA) website, and the American Society for Photogrammetry and Remote Sensing (ASPRS) website.