This document discusses remote sensing platforms and sensors. There are three types of platforms based on altitude: ground-born, air-born, and space-born. Ground-born platforms include handheld devices and towers used for small areas. Air-born platforms are aircraft and balloons that can image any area. Space-born platforms are satellites that sense from space. Sensors are devices that detect energy, convert it to a signal, and provide target information. Sensors are either active, using their own energy source like radar and lidar, or passive, receiving solar or emitted energy like cameras.

1. REMOTE SENSING
PLATFORM AND
SENSORS

2. Platform and their types
Platform is a stage where sensor or camera is mounted to
acquire information about a target under investigation. Platforms can
vary from stepladders to satellites.
There are different types of platforms and based on its altitude
above earth surface, these may be classified as:
1. Ground born
2. Air born
3. Space born

3. 1. Ground-born platform
Wide varieties of ground-
based platforms are used in
remote sensing. Some of the
common ones are hand held
devices, tripods, towers and
cranes. To study properties
of a single plant or a small
patch of grass, ground
based platform is used.

4. 2. Air-born platform
Airborne platforms are
used to collect very
detailed images and
facilitate the collection of
data over virtually any
portion of the Earth's
surface at any time. such
as balloons, aircrafts,
rockets, helicopter etc.

5. 3. Space-born platform
Remote sensing is also
conducted from the
space shuttle or
artificial satellites. The
platform which is used
in space are called
space born platform.

6. Sensors and their types
Sensor is a device that gathers energy (EMR or other),
converts it into a signal and presents it in a form
suitable for obtaining information about the target
under Investigation.
Depending on the source of energy, sensors are
categorized as –
1. Active sensor
2. Passive sensor

7. 1. Active Sensors
Active sensors are those, which have
their own source of EMR for
illuminating the objects.
Radar (Radio Detection and Ranging)
Lidar (Light Detection and Ranging)

8. 2. Passive sensor
Passive sensors do not have
their own source of energy.
These sensors receive solar
electromagnetic energy
reflected from the surface or
energy emitted by the surface
itself.

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