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GEOM 3002 Introduction to Air Photo Interpretation and Remote Sensing

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Title: GEOM 3002 Introduction to Air Photo Interpretation and Remote Sensing


1
GEOM 3002Introduction to Air Photo
Interpretation and Remote Sensing
2
Remote Sensing
  • The art, science, and technology of obtaining
    reliable information about physical objects and
    the environment, through the process of
    recording, measuring and interpreting imagery and
    digital representations of energy patterns
    derived from non-contact sensor systems (ASPRS,
    1988)

3
Remote Sensing
  • http//en.wikipedia.org/wiki/Remote_sensing
  • http//rst.gsfc.nasa.gov/Intro/Part2_1.html
  • http//ccrs.nrcan.gc.ca/resource/tutor/fundam/chap
    ter1/01_e.php

4
The Remote Sensing Process
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Google Earth
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http//veimages.gsfc.nasa.gov//1438/earth_lights.g
if
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GLEL Airborne CIR image lt10cm pixels
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Can see and map different things at different
scales
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Can see and map different things at different
scales
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Can see and map different things at different
scales
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Universe to Earth Scale
  • http//micro.magnet.fsu.edu/primer/java/scienceopt
    icsu/powersof10/index.html

14
Remote Sensing Summary
  • What this course is about
  • Remote sensing uses images created by radiated
    energy (radiation) that has been reflected from a
    surface or emitted by the surface and that has
    travelled from the surface to a sensor.
  • Understanding the nature of the radiation, and
    how it interacts with the surface helps in
    understanding what an image is showing
  • Brightness in the image the amount of radiation
    reflected or emitted.
  • Can analyze brightness visually (interpretation
    on-screen or of hardcopy), or quantitatively
    (with computer algorithms).
  • Brightness differences in images can be used to
    map land cover type vegetation and water
    condition soil moisture crop yield, etc.

15
Some Advantages of Remote Sensing
  • Synoptic can give an overview of a region as a
    whole.
  • Extensive and complete data coverage in a very
    short time data are acquired for all points in
    an area
  • Differs from field measurement where only a few
    points can be sampled.
  • Can acquire data for regions that cant be easily
    accessed
  • Can observe the environment using energy outside
    the visible part of the EM spectrum (invisible
    becomes visible).
  • Quantitative qualitative information.
  • Imagery is linked to positions on the Earth.
  • Many sensor types, imaging methods, image
    processing, analysis and mapping algorithms.
  • Easy to conduct change analysis using imagery
    from different times or dates.
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