Title: Introduction%20to%20Remote%20Sensing
1- Introduction to Remote Sensing
- Example Applications and Principles
- Exploring Images with MultiSpec
- User Interface and Band Combinations
- Questions
2Definitions
- Lillesand and Kiefer (1994) The science and
art of obtaining information acquired by a
device that is not in contact with the object - CCRS Glossary A group of techniques for
collecting image or other forms of data from
measurements made at a distance from the object,
and the processing and analysis of the data.
3Examples of Remotely Sensed Data
- Weather
- Ocean Properties
- Physical Geography
- Major Disturbance Events / Hazards
- Cultural Features urban mapping
- Many other examples thematic info
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5back
6disturbance
back
7back
8back
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10Decision
From Lillesand and Kiefer (1994)
11Decision
From Lillesand and Kiefer (1994)
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13An Electromagnetic Wave
l wavelength
c velocity of light
n frequency
From Lillesand Kiefer (1994)
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18O3 absorption at 0.2 um
19H2O absorption at 1.4, 1.6, and 1.9 um
20CO2 absorption at 2.0 um
21CH4 absorption at 2.2 2.5 um
22Human eye
23E(l)i E(l)a E(l)t Er(l)
Incident Energy
Reflected Energy
24Atmospheric Interactions
Rayleigh Scattering
25Types of Satellite Orbits
- Geostationary 35,790 km above the Earth
- Sun-synchronous or Polar between 700 and 800
km above the Earth
26Satellite Orbits
http//science.nasa.gov/Realtime/jtrack/3d/JTrack3
D.html
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28Resolution in Remote Sensing
- Four types
- 1) Spatial the ground coverage / pixel
- 2) Spectral area and subdivision of the EM
spectrum - 3) Temporal frequency of coverage
- 4) Radiometric sensitivity to changes in
energy intensity
29Issues of spatial temporal scale of the sensor
platform -SPATIAL- grain and extent Pixel
-TEMPORAL- Frequency of
imaging
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31September 30
September 15
October 15
October 30
32Color Theory and Band Combinations
- Additive colors vs. Subtractive colors
- Natural and False color composites
- Displaying images, extracting information
33No single primary can be formed by mixture of
other two All other colors can be formed by
mixtures of additives
Representations of color via pigments and
dyes Yellow absorbs blue, cyan absorbs red,
magenta absorbs green
34Blue (0.45 um) Green (0.55 um) Red (0.65 um)
35Green 2.5 x
Red x
Blue x
Blue (0.45 um) Green (0.55 um) Red (0.65 um)
36Feb. 14, 2006 MODIS Terra, Eastern US
37Snow Vs. Clouds
Clouds scatterat all wavelengths
Snow absorbs at gt1.4 mm
38Snow Vs. Clouds
Clouds scatterat all wavelengths
Snow absorbs at gt1.4 mm
c
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41Natural Color 3,2,1
Color IR 4,3,2
False Color 5,4,3
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44MultiSpec RS Software
- Research and education
- Long period development and refinement
- Freely available
- Supported by tutorials
- http//cobweb.ecn.purdue.edu/biehl/MultiSpec/