week 1

Question 1

Describe remote sensing

Answer 1

• The art and science of obtaining information about an object without physically contact between the object and sensor
• The processes of collecting information about Earth surfaces and phenomena using sensors not in physical contact with the surfaces and phenomena of interest.

Question 2

Remote sensing:

there is a

Answer 2

medium of transmission involved example: earth’s atmosphere

Question 3

steps of remote sensing

Answer 3

1. The mission plan and choice of sensors
2. The reception, recording, and processing of the signal data
3. The analysis of the resultant data.​

Question 4

Remote sensing process components

Answer 4

Energy Source or Illumination (A)

Radiation and the Atmosphere (B)

Interaction with the Target (C)

Recording of Energy by the Sensor (D)

Transmission, Reception, and Processing (E)

Interpretation and Analysis (F)

Application (G)

Question 5

Type of resolution:

Answer 5

1. Spatial
2. Spectral
3. Temporal
4. Radiometric

Question 6

Describe Spatial resolution

Answer 6

a term that refers to the number of pixels utilized in construction of a digital image. Images having higher spatial resolution are composed with a greater number of pixels than those of lower spatial resolution.

Question 7

Describe Spectral resolution

Answer 7

• Is the ability to resolve spectral features and bands into their separate components
• More number of bands in a specified bandwidth means higher spectral resolution and vice versa
  
  • panchromatic - 1 band (B&W)
  • Color - 3 bands (RGB)
  • Multispectral - 4+ bands (e.g. RGBNIR)
  • Hyperspectral - hundreds of bands

Question 8

Describe temporal resolution

Answer 8

• Refers to the precision of a measurement with respect to time
• Frequency at which images are recorded/ captured in a specific place on the earth.
• The more frequently it is captured, the better or finer the temporal resolution is said to be

Question 9

Describe radiometric resolution

Answer 9

• Sensitivity of the sensor to the magnitude of the received electromagnetic energy determines the radiometric resolution
• Finer the radiometric resolution of a sensor, if it is more sensitive in detecting small differences in reflected or emitted energy​

Question 10

Types of Remote Sensing

Answer 10

• Aerial photography
• Multispectral
• Active and Passive Microwave and LIDAR

Question 11

Electromagnetic spectrum

Answer 11