The American space agency NASA's new satellite will help scientists track water on land.
The Surface Water and Ocean Topography Satellite (SWOT) will be launched from Vandenberg Force Base in California on Thursday.
This is a joint mission of NASA and the French National Center for Space Studies. SWOT will make it easier for scientists to measure water movement and depth throughout the world.
Rosemary Morrow, an oceanographer associated with this mission, said, "This will change the situation a lot. It will be like putting on glasses to see the situation clearly."
Data and images from SWOT can also be used to control and increase water levels.
Tamlin Pavelsky, a hydrologist involved in this mission, said that only 10,000-20,000 of the approximately 6 million lakes and reservoirs on earth have publicly available data.
SWOT will make it easier for scientists to measure the movement and depth of water around the world.