The presentation include basic information on Remote Sensing

1. WELCOME
WELCOME

2. ES 231 Remote
Sensing

3. Definition
Remote Sensing is the science and art of obtaining
information about an object area or phenomenon
through the analysis of data acquired by a devise that is
not in contact with the object area or phenomenon under
observation
Best Example: Eyes while reading
Eyes act as sensors, which reflects light from the page
Data acquired is the impulses corresponding to the
amount of light reflected
Data analyzed and interpreted by the mental computer

4. Data
The remotely collected data can be of many forms
including:
variations in force distributions
Acoustic wave distribution
Electromagnetic wave distribution
Eg.
A gravity meter acquires data on variations of the
force of gravity
Sonar obtains data on variations in sound

5. Illustration of Generalized process and elements in EM Remote Sensing of Earth resources

6. Basic Processes involved in Remote Sensing
- Data Acquisition
- Data Analysis
Data Acquisition includes
(a) Propagation of energy through atmosphere
(b) Energy interaction with earth surface features
(c) Retransmission of energy through atmosphere
(d) air-borne or space-borne sensors
(e) generation of sensor data in digital or pictorial
form
In short, we use sensors to record variations in the way
earth surface features reflect and emit electromagnetic
energy

7. Data Analysis
Include:
(f) examining data using various viewing and
interpretation devices to analyze pictorial data and/or a
computer to analyze digital sensor data
Ground Truthing
Collection of reference data about the resources being
studied are used when and where available to assist data
analysis
Examples for this:
soil maps, crop statistics, field check data etc.

8. The ground reference data are used by the analyst to extract
information about the type, extend, location and condition
of various resources of which sensor data has been collected
(g) The information is then compiled
The compilation can be in the form of
hard copy maps
tables
computer files that can be merged with other layers
of information in the form of a Geographic Information
System (GIS)
(h) The information is then presented to users which is
supplied to the decision making process

9. Ground Truthing

10. THANK YOU