CGO4M: All about Satellites TEST Review

Answer all of the questions below:

  1. In simple language, define what remote sensing means.
  2. Using examples, explain 5 types of satellites and their uses.
  3. Distinguish between geo-stationary and sun-synchronous (near-polar) satellites.
  4. What is the difference between passive and active sensors?
  5. A passive sensor deals with reflected light involving the spectrum. What does this mean?
  6. HINT: In remote sensing, the device used to acquire data, i.e. to measure the radiation arriving to the satellite instrument, is usually referred to as a “sensor”. The word sensor is preferred because it refers to a broader way of getting information than a camera. A camera usually refers to information that can only be seen by the eye (and in some case to infrared, depending on the film and camera that are used), whereas remote sensing involves many different types of radiation in the electromagnetic spectrum, which are they?
  7. Describe the two main types of image resolution (Spatial and Spectral?)
  8. What is a false colour composite? Why is water black? What is a true colour composite?
  9. What is a panchromatic colour spectrum? Explain the following image:
  1. Describe each letter of the following diagram:
  2. REMEMBER: In Remote Sensing, three elements are essential.

These are:

•a PLATFORM to hold the instrument, which are?

•a target OBJECT to be observed, which is?

•an instrument or SENSOR to observe the target, which observes?

A key additional element (and the main purpose of remote-sensing systems) is:

•the INFORMATION that is obtained from the acquired data and how it is used and stored. A photograph will use an analogue format; while satellites use a digital format, explain the difference? Click on the link below:

11. With reference to the many possible remote sensing applications, what does the following mean? “Each application itself has specific demands, for spectral resolution, spatial resolution, and temporal resolution.”

12. Finally, review your “All about Satellites” Q & As, including the PowerPoint notes!