PART OF REMOTE SENSING

1. Interaction of EMR
with atmosphere
and matters
Manish Galav
11710834

2. Interaction with atmosphere
Absorption and Scattering
Scattering: it’s unpredictable diffusion of
radiation due to the Gases like nitrogen,
oxygen, water vapor, Ozone etc.

3. Type of scattering: based on the
size of particle with which EMR
interact
 1.Non-selective scattering:
Occur when size of particles>> wavelength
of EMR
Example scattering by water droplets, ice
and snow crystals

4. 2.Selective scattering
 Rayleigh scatter:
1. Occur in upper layers of atmosphere
2. Mainly due to the gas particles
 Mie scatter:
1. Occur in lower layers of atmosphere
2. Mainly due to dust , water vapor
3. Influence the longer wavelength

5. Absorption of radiation
 Occurs in specific wavelength intervals called
absorption band
 Wavelengths < .3micrometer are completely
absorbed by ozone layer
 Only longer wavelength radiation can penetrate
 Atmospheric window : wavelength region which
can reach on target without much attenuation

6. Interaction with Target
 Phenomenon occur:
 Absorption
 Reflection
 Emission
 Scattering

8. Reflectance from vegetation &
water

9. THANK YOU