AGRO 500 Special Topics in Agronomy Remote Sensing Use in Agriculture and Forestry Lecture 2 Satellite data introduction

1
AGRO 500 Special Topics in AgronomyRemote
Sensing Use in Agriculture and Forestry Lecture
2Satellite data introduction

• Junming Wang
• Department of Plant and Environmental Sciences
• Skeen Hall, NMSU, Las Cruces

2
Internet links

• This lecture http//hydrology1/Teaching_Material/
  Agro500/Agro500Lecture2_files/frame.htm

3
Electromagnetic radiation

• With the exception of objects at absolute zero
  degree, all objects emit electromagnetic
  radiation.
• Objects also reflect radiation that has been
  emitted by other objects.
• (Campbell, 1996)

4
Electromagnetic radiation
(Campbell, 1996)
5
(Campbell, 1996)
6
(Campbell, 1996)
7

• The speed of electromagnetic energy (c) is
  constant at 299,893 kilometers per second.
  Frequency (v) and wavelength (?) are related
• c v ?
• Therefore, chracteristics of electromagnetic
  energy can be specified using either frequency or
  wavelength.

(Campbell, 1996)
8
Solar radiation
Thermal infrared from earth
http//eosweb.larc.nasa.gov/EDDOCS/Wavelengths_for
_Colors.html http//www.colorado.edu/physics/2000/
waves_particles/wavpart2.html
9
Optical spectrum

• 0.3 to 15 um, defines those wavelengths that can
  be reflected and retracted with lenses and
  mirrors.
• Reflective spectrum 0.38-3 um solar spectrum.
• 3-15 um, thermal infrared, earth surface emitted
  radiation, consisting of