remote sensing - by iut cee'10
DESCRIPTION
A presentation on Remote Sensing presented by Dept of Civil & Environmental Engineering'10, Islamic University of Tehcnology.TRANSCRIPT
Presented By
Student no.: 105426-1054491st SemesterDept of Civil & Environmental EngineeringIslamic University of Technology
REMOTE SENSING
Overview
• Brief Introduction• History• Systems & principles• Observation platforms• Sensors• Applications• Perspective in Bangladesh
Synthetic aperture radar image of Death Valley colored using polarimetry
Introduction
• A science and art of collecting infos about objects, area from distance without any physical contact with them
• Classifications– Passive remote sensing
• Sun as a source of EM energy– Active remote sensing
• Own source of EM energy
History
• It became possible with the invention of camera in nineteenth century
• Astronomy was the first field to exploit this technique, first world war
• Till 1960, all the photographs were black & white
• July 1972, ERTS-1 (Landstat-1)• SPOT, IRS-1A, JERS, MOS, RADARSAT
ERTS-1 before launch in 1972
Systems of RS
• An idealized remote sensing system consists the following stages-1. Energy source2. Propagation of energy3. Energy interaction with surface4. Airborne/space borne sensors receiver5. Transmission of data to earth station6. Multiple-data user
Systems of RS
Receiving stationprocessing Archiving
Distribution
6
Basic Principles
• RS refers to the sensing of Electromagnetic Radiation which is reflected, scattered or emitted from the object on the surface
• Therefore Electromagnetic Energy interaction with the object is a big factor
• EM is a form of energy that moves with the velocity of light in a harmonic pattern
• It consists of sinusoidal waves
Basic Principles
• EM Spectrum– EM radiation can be produced at a range
of wave lengths and can be categorized according to its position into discrete regions which is referred to EM spectrum
– RS deals with energy in visible, infrared, thermal and microwave regions
– Significant amount of RS performed using infrared ray is not related to heat
EM Radiation and the Atmosphere
• The resisting materials in the atmosphere like water vapor, oxygen, ozone, aerosols influence EM radiation through-– Scattering– Absorption
• EM radiation that strikes or encounters object is referred to incident radiation
• The incident radiation changes and the science of RS detects and records these changes
Observation Platforms• Remote Sensing is done and observed from mainly
two types of platforms-– Air Borne platforms– Space Based platforms
• Air borne platforms:Observations from Aircraft based platforms are very expensive and time costly– Till now, RS of the surface of earth has been done
by several platforms like • balloons, pigeons• Aircraft mounted system for military purposes• India currently uses models named Dakota,
AVRO Bench-craft Superking Air 200
The TR-1 reconnaissance/surveillance aircraft
Observation Platforms
• Space based platforms:It is more cost effective and has several
advantages- Satellite
- Polar orbiting satellites- Geo-stationary satellites- Landstat satellites- SPOT satellite program
Observation Platforms
100 meter resolution
Observation Platforms
30 meter resolution
Observation Platforms
5 meter resolution
Sensors• Remote Sensing sensors are electronic
instruments that receive EM radiation and generate an electrical signal corresponding to the energy variation of different earth surface features
• The signal can be recorded and displayed as numerical data or image
• The strength of the signal depends on– Energy flux– Altitude– Spectral band width– Instantaneous field of view (IFOV)– Dwell time
Applications
• RS provides a practical means for accurate and continuous monitoring earth’s nature and other resources
• Agriculture• Forestry• Land use and soils• Geology• Urban Land Use• Water Resources
Applications
• Coastal Environment• Ocean Resources• Street-network based applications• Facilities management• Disasters• Digital elevation models
– Contours (>10m)– Slope/Aspect analysis– Large scale mapping upto 1:25000 scale
Perspective in Bangladesh
• The Space Research and Remote Sensing Organization (SPARRSO) is the national space agency of Bangladesh established in 1980
• SPARRSO has used Remote Sensing a number of times for– Disaster monitoring– Environment study– Forestry
• Still they are in lack of modern equipments and facilities
Thank You
© IUT CEE’10
Presented By-
Presentation Group: Speaker Group:Prottush 105434 Jeeshan
105445Miraj 105427 Shykat
105447Rimon 105435 Hridoy
105448Shaon 105436 Minhaj (Uncle)
105432Sadil 105449 Istiak
105429Shajib 105442 Saad
105433Foisal 105441 Irtiza
105439Samit 105428 Labib
105438Rifat 105430 Anik
105431Ahmad 105446 Materials Group:
Rian 105437Tanvir 105444Sakif 105443Habib 105426