Which types of observation from a satellite would be most appropriate for determining the Earth's topography? Select all of the following that are correct. Points are awarded for each correct answer selected. Points are deducted for each incorrect answer selected. Question 7Answera.Lidar b.Synthetic Aperture Radar (SAR) c.Reflected sunlight at visible to near-infrared wavelengths d.Reflected UV sunlight at wavelengths < 150 nm e.Thermal emission at 15-20 micrometers f.Movement of clouds g.The strength of Earth's gravitational field h.Impact of the atmosphere on the signal from GPS satellites

The types of observation from a satellite that would be most appropriate for determining the Earth's topography are:

a. Lidar: Lidar (Light Detection and Ranging) is a remote sensing method that uses light in the form of a pulsed laser to measure variable distances to the Earth. These light pulses—combined with other data recorded by the airborne system— generate precise, three-dimensional information about the shape of the Earth and its surface characteristics.

b. Synthetic Aperture Radar (SAR): SAR is a type of radar that is used to create two- or three-dimensional images of objects, such as landscapes. SAR uses the motion of the radar antenna over a target region to provide finer spatial resolution than conventional beam-scanning radars.

c. Reflected sunlight at visible to near-infrared wavelengths: Visible and near-infrared wavelengths can provide information about the Earth's surface, including its topography. This is because different types of terrain (such as forests, deserts, water bodies, etc.) reflect sunlight in different ways.

g. The strength of Earth's gravitational field: The strength of Earth's gravitational field can also provide information about the Earth's topography. This is because the strength of the gravitational field is influenced by the distribution of mass within the Earth, which is in turn influenced by the Earth's topography.

h. Impact of the atmosphere on the signal from GPS satellites: The signals from GPS satellites are affected by the Earth's atmosphere in ways that can provide information about the Earth's topography. For example, the time it takes for a signal to travel from a GPS satellite to a receiver on the Earth's surface can be used to calculate the altitude of the receiver, which is a component of topography.