"Number of oscillations per unit time or number of wavelengths that pass a point per unit time. In other words, the rate of oscillation of a wave. In remote sensing, frequency is used to quantify electromagnetic radiation by denoting the number of oscillations of the perpendicular electric and magnetic fields per second. This measurement is expressed in hertz (Hz), or number of cycles per second. One megahertz (MHz) is equal to one million cycles per second, while one gigahertz (GHz) is equal to one billion cycles per second" (National Aeronautics and Space Administration, 2019)


"Glossary". Goddard Soace Flight Center, National Aeronautics and Space Administration. 2019.
Accessed April 1, 2019.

Related Content


Space-Based Radioglaciology: Refining Climate Models and Monitoring Ice

About 40% of the World’s population lives within 100 km of the coast (United Nations 2017).  Sea levels are on the rise around the World and the trend is accelerating every year. The UN, countless international organizations and national agencies are working hard every year to support the efforts of climate scientists to accurately model our changing climate. The role of ice in shaping the Earth’s seas is indisputable. As continental ice melts and as ice sheets break off from continental shelves and fall into the sea, more and more coastal communities are threatened.

Global Precipitation Mission: Improved, accurate and timely global precipitation information

Continuous and reliable global precipitation information is crucial for myriad of weather, climate and hydrological applications. The importance of precipitation in the form of rain, hail, sleet, snow etc. is known to science and clear to a layman. However, it’s quite tricky to measure past precipitation trends or predicting accurate future forecasts. There are three main categories of precipitation data sets available: ground based, satellite-based and blended products of ground and space data (Climate Data Guide, 2014).