To collect data about the Earth's surface from a distance.

To study the Earth's atmosphere.

To monitor the Earth's climate.

To track the movement of animals.

Active and passive.

Optical and thermal.

Spatial and temporal.

Global and local.

Optical remote sensing uses visible light, while thermal remote sensing uses infrared light.

Optical remote sensing measures the amount of light reflected by an object, while thermal remote sensing measures the amount of heat emitted by an object.

Optical remote sensing is used to study the Earth's surface, while thermal remote sensing is used to study the Earth's atmosphere.

Optical remote sensing is more accurate than thermal remote sensing.

The size of the smallest object that can be detected in the image.

The number of pixels in the image.

The area covered by the image.

The wavelength of the radiation used to create the image.

The frequency with which an image is acquired.

The length of time it takes to acquire an image.

The area covered by the image.

The wavelength of the radiation used to create the image.

Geostationary, polar, and sun-synchronous.

Low Earth orbit, medium Earth orbit, and high Earth orbit.

Circular, elliptical, and parabolic.

Prograde, retrograde, and polar.

Geostationary satellites orbit the Earth at a constant altitude, while polar satellites orbit the Earth at a varying altitude.

Geostationary satellites orbit the Earth at a constant speed, while polar satellites orbit the Earth at a varying speed.

Geostationary satellites orbit the Earth in a circular orbit, while polar satellites orbit the Earth in an elliptical orbit.

Geostationary satellites orbit the Earth in a prograde orbit, while polar satellites orbit the Earth in a retrograde orbit.

Sun-synchronous satellites orbit the Earth in a way that keeps them in constant sunlight, while non-sun-synchronous satellites orbit the Earth in a way that takes them through both sunlight and darkness.

Sun-synchronous satellites orbit the Earth at a constant altitude, while non-sun-synchronous satellites orbit the Earth at a varying altitude.

Sun-synchronous satellites orbit the Earth at a constant speed, while non-sun-synchronous satellites orbit the Earth at a varying speed.

Sun-synchronous satellites orbit the Earth in a circular orbit, while non-sun-synchronous satellites orbit the Earth in an elliptical orbit.

Optical, thermal, and radar.

Active, passive, and microwave.

Spatial, temporal, and spectral.

Global, local, and regional.

Optical sensors measure the amount of light reflected by an object, while thermal sensors measure the amount of heat emitted by an object.

Optical sensors use visible light, while thermal sensors use infrared light.

Optical sensors are more accurate than thermal sensors.

Optical sensors are less expensive than thermal sensors.

Radar sensors use active remote sensing, while optical and thermal sensors use passive remote sensing.

Radar sensors can penetrate clouds and darkness, while optical and thermal sensors cannot.

Radar sensors are more accurate than optical and thermal sensors.

Radar sensors are less expensive than optical and thermal sensors.

Land use mapping, agriculture, and forestry.

Geology, hydrology, and oceanography.

Meteorology, climatology, and air quality.

All of the above.

The high cost of satellite imagery.

The difficulty of interpreting satellite imagery.

The limited availability of satellite imagery.

All of the above.

The development of new satellite sensors with higher spatial and temporal resolution.

The development of new methods for interpreting satellite imagery.

The increased availability of satellite imagery.

All of the above.

The use of remote sensing to spy on people.

The use of remote sensing to collect data without the consent of the people being observed.

The use of remote sensing to discriminate against certain groups of people.

All of the above.