What are the basic principles of remote sensing?
Remote sensing uses a part or several parts of the electromagnetic spectrum. It records the electromagnetic energy reflected or emitted by the earth’s surface. The amount of radiation from an object (called radiance) is influenced by both the properties of the object and the radiation hitting the object (irradiance).
What is the principle of remote sensing explain its types of orbit?
Satellite Orbits As the earth below is rotating, the satellite traces out a different path on the ground in each subsequent cycle. Remote sensing satellites are often launched into special orbits such that the satellite repeats its path after a fixed time interval.
What are the types of remote sensing?
Remote sensing instruments are of two primary types:
- Active sensors, provide their own source of energy to illuminate the objects they observe.
- Passive sensors, on the other hand, detect natural energy (radiation) that is emitted or reflected by the object or scene being observed.
What are the seven elements in remote sensing?
Remote Sensing Image data processing. Grey Level Enhancement Contrast stretching Linear mapping Non-linear mapping Efficient implementation of mapping algorithms Design of classes to support.
Which is not a principle of remote sensing?
3. Which of the following is not a principle of remote sensing? The principles are electromagnetic energy, electro-magnetic spectrum, interaction of energy with atmosphere etc.
What are the characteristics of remote sensing?
2 Characteristics of remote sensing imagery. Remote sensing images are characterised by their spectral, spatial, radiometric, and temporal resolutions. Spectral resolution refers to the bandwidth and the sampling rate over which the sensor gathers information about the scene.
What are the four basic components of remote sensing?
There are four basic components of a remote sensing system ( Fig. 1) including: (1) a target; (2) an energy source; (3) a transmission path; and (4) a satellite sensor (Landsat, SPOT, or the SIR-C radar) which records the intensity of electromagnetic radiation (sunlight) reflected from the earth at different …
What is importance of remote sensing?
The advantages of remote sensing include the ability to collect information over large spatial areas; to characterize natural features or physical objects on the ground; to observe surface areas and objects on a systematic basis and monitor their changes over time; and the ability to integrate this data with other …
What are the two major components of remote sensing?
The remote sensing is divided into two major categories – satellite remote sensing and aerial photography.
What are the principles of remote sensing?
PRINCIPLES OF REMOTE SENSING Detection and discrimination of objects or surface features means detecting and recording of radiant energy reflected or emitted by objects or surface material (Fig. 1). Different objects return different amount of energy in different bands of the electromagnetic spectrum, incident upon it.
What are the stages in remote sensing?
Remote Sensing System. There are a number of stages in a Remote Sensing process, and each of them is important for successful operation. Stages in Remote Sensing • Emission of electromagnetic radiation, or EMR (sun/self- emission) • Transmission of energy from the source to the surface of the earth, as well as absorption and scattering
How does active remote sensing work?
An active remote sensing system supplies its own source of energy to illuminate the objects and measures the reflected energy returned to the system (similar to photography in night with flash). Two major steps are involved in this process. The first one is data acquisition and the second data processing and interpretation.
What is a reflection in remote sensing?
In remote sensing, we are most interested in measuring the radiation reflected from targets. We refer to two types of reflection, which represent the two extreme ends of the way in which energy is reflected from a target: specular reflection and diffuse reflection.