Conceptual illustration of the NASA-ISRO synthetic aperture radar satellite (NISAR) above Earth. The NISAR mission is a joint project of NASA and Indian Space Research Organisation (ISRO). NISAR will be the first radar imaging satellite that use two different radar frequencies. The satellite will be used to observe the Earth and measure changes in the planet's surface. NISAR is expected to launch aboard a GSLV Mk II rocket in 2023.