Introduction Flashcards
What is remote sensing?
Remote sensing is any technique that acquires data and information regarding a specific object without coming into physical contact with that object
Remote Sensing is a top-down process, what are the 4 steps
- User Driven Questions
- Appropriate data acquisition
- Image Classification Classifiers and Decision Rules
- Accuracy Assessment
What are the 4 different spatial resolutions?
- spatial
- spectral
- temporal
- radiometric
What is spectral resolution/?
In multispectral cameras what band is usually used?
Refers to the sensors design as related to the spectral width that is recorded per band/channel
- 10nm
What is Radiometric Resolution?
The data which comprises the remotely-sensed image is stored as a matrix of numbers.
- ranging 8 - 32 bit.
8 bit or 32 bit which has more detail?
32 bit, more bits more detail and precision.
What type of energy does remote sensing use?
electromagnetic
Active Systems in Remote Sensing?
What does it require?
What is an advantage of this?
Systems which generate their own energy,
- needs to have ability to emit energy source and record the return of a signal
- advantage is that its not restricted to time when an outside energy source is available.
Examples of Active Systems? 4
- LIDAR
- RADAR
- SONAR
- SEISMIC
Explain Passive Systems in Remote Sensing?
whats the most commonly used energy source?
- what does its image resemble
- rely on outside sources of energy
- most common sensors available
- most common energy source is the sun
- resembles closely to what the human eye can see.
Examples of Passive Remote sensing?
Aerial Photography, Multispectral Scanners
What wavelengths do thermal sensors use?
10 micrometers
What energy does multispectral scanners use?
What type of remote sensing are they?
- uses blue (450) to the middle infrared (2500nm)
- light reflected of earths surface
- Passive type
What are the 4 interconnected disciplines in Remote Sensing?
- aerial photography
- image interpretation
- photogrammetry
- image processing
