What is remote sensing?
Process of remote sensing
Concept of remote sensing
Classification of remote sensing
Remote sensing data
Advantages of RS
Disadvantages of RS
Application of RS
3. What is REMOTE SENSING ?
Source of Force
Sensor System e.g.. Camera
Resulting RS Data
4. Definition of Remote Sensing
• A science and art of collecting information about object ,
area or phenomena from distance without being a physical
contact with them.
• Human eye is perhaps the most familiar example of a
6. Data Acquisition
1. Energy Source
2. Propagation of energy through atmosphere
3. Interaction of energy with surface features of the
4. Air Borne or space borne sensors
5. Sensors data in pictorial or digital form
6. Transmission of data to Earth station and data
7. Multiple data users
7. Data Analysis
1. Viewing and interpreting devices for pictorical data
and a computer to analyse digital sensor data
2. Completion of information in the form of hard copy
maps and tables
3. Presentation of the information to users
8. Classification of Remote Sensing
• Active System- provides its own energy source of
• Passive System- It is need an external energy sources.
10. Remote Sensing Data
• Remote sensing data that has collected by a sensor
that is not in direct contact with the area being
• The type of RS data plays a significant role in the
ability to analyse an area from some distance away.
11. Advantages of Remote Sensing
• Relatively cheap and rapid method of acquiring up to
date information over large geographical area.
• It is the only way to gain data from in accessible
• It is the method of constructing base maps in absence
of detailed land survey.
12. Disadvantages of Remote Sensing
• They are not direct samples of the phenomenon so
must be calibrated against reality.
• They must be corrected geometrically of geo
referenced in order to be useful as maps, not only as
• Distinct phenomenon can be confused if they look the
same to the sensor, leading to classification error.
• 1860's - Aerial
possible photography, for
military purposes were
acquired from balloons in
the Civil War. Balloons
were used to map forest
in 1862, but not used to
photographs as far as
scholars can tell
• 1903 - The Bavarian
Pigeon Corps uses pigeons
to transmit messages and
take aerial photos.
15. Application of Remote Sensing
• Land use and soil
• Digital elevation models
• It is the only way to obtain unbiased data repetitive
• The remote sensing is restricted to methods that
• Remote sensing data include multiple air photos,
radiometer and photometer .