Satellite Comparison - Clouds Protocol

What is a Satellite Comparison?

A Satellite Comparison is a process where your ground-based cloud observations are matched with data collected by Earth-observing satellites. Review how to make and submit cloud observations with the cloud protocol or the eTraining slides.

One of the most exciting parts in making a cloud observation is receiving your personalized NASA “Satellite Comparison” email, which includes details from your observation and matching satellite data collected around the same time and location.

Why is a Satellite Comparison Important?

Satellites can only capture a top-down view of our planet. We need your ground observations to complement what the satellite cannot see, for example, cloud bases, ground cover, and multiple cloud layers.

• You expand the reach of scientists who are limited in time, resources, and personnel.
• You are contributing to a database that has been growing for over 2 decades. A long-term data set is crucial for scientists to see patterns and change over time.
• You add another layer of perspective helping scientists to better understand the effects of clouds on our Earth.

How Can You Receive a Satellite Comparison Email?

• GLOBE Cloud observations can be made anytime, anywhere.
• You will receive an email comparing your observation to satellite data if a satellite measurement is taken at your location at the same time as your observation.
• Your observation may be compared to either geostationary satellites (almost anytime) or low Earth orbiting satellites (during overpass).

All observations matched to satellite data are used in research. In the "Cloud Research" video NASA scientist Dr. Brant Dodson explains how your observations are used in research and the importance of your GLOBE cloud observations.