has been launched with a
to map the world's oceans, lakes, rivers and other
. It has been dubbed SWOT - Surface Water and Ocean Topography. It went into
. Data from the satellite will help scientists to monitor how climate change is
affecting water levels. The broadcaster PBS said: "SWOT is needed more than
, as climate change worsens
, flooding and coastal erosion." NASA said SWOT was of "
" importance. It said: "We're going to see Earth's water like we've never seen it