The difference between active and passive remote sensing systems is that
A. active systems emit their own energy while passive systems simply detect existing energy signals.
B. active systems can operate throughout cloud or fog cover while passive systems require clear sky conditions.
C. active systems involve the latest generation of satellites while passive systems use signals from older satellites.
D. active systems include aerial photography while passive systems rely on satellite imagery.
Answer: A
You might also like to view...
More-developed countries primarily use ____________________ agriculture for food production.
Fill in the blank(s) with the appropriate word(s).
What type of slope failure is shown in this figure?
A) Rotational slide
B) Creep
C) Earth flow
D) Debris flow
E) Rock avalanche
What percent of all commercial energy used in the United States is wasted?
A. 0%. B. 18% C. 43% D. 84% E. 100%
What was the major reason why the death rate dropped in the Stage 2 of the Demographic Transition?
A) vaccinations B) domestication of plants and animals C) public health measures, such as sewer systems and clean drinking water D) advances in surgical procedures E) Warfare declined.