Download - Lesson: Remote sensing imagery
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Lesson: Remote sensing imageryZirek MalikovaOShTU, Software Engineering [email protected]
Module: Data Acquisition and data interpretation
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Objectives:1. Definition of remote sensing.2. Basics of remote sensing.3. Remote sensing software.4. Tasks for students.5. References.
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What is Remote Sensing?"Remote sensing is the science (and to some extent, art) of acquiring information about the Earth's surface without actually being in contact with it. This is done by sensing and recording reflected or emitted energy and processing, analyzing, and applying that information."
[A Canada Centre for Remote Sensing Remote Sensing Tutorial]
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Basics of remote sensing•Physical basics•Satellite systems•Visual image interpretation•Image processing and enhancement•Classification techniques
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Physical basics
•electromagnetic spectrum, •radiation and absorption principles, atmospheric influences
•Energy interpretation with earth surface features
•spectral reflectance properties
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The electromagnetic spectrum
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Energy Interaction with Earth Surface Features
Specular and diffuse reflectance.
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Satellite orbits•Geostationary orbit(METEOSAT)
Synchronous (polar) Orbit (LANDSAT)
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Satellite sensorsActive sensors Passive sensors
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Resolutions•Spatial•Spectral•Radiometric•Temporal
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Spatial resolution•Low resolution: larger 30 m•Medium resolution: 2-30 m•High resolution: under 2 m
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Spectral resolutions
LANDSAT and SPOT spectral resolution
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Visual image interpretation1. the recognition of objects2. a true interpretation
Schematic presentation of the Interpretation Process.
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Image enhancement• Histogram Stretches
• Filter
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Image classification
Unsupervised Classification
Supervised Classification
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The classification process
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Remote sensing software•ERDAS
•MapInfo•ESRI•AutoDesk•IDRISI•RemoteView
Open source
• GRASS GIS• QGIS• OSSIM
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Tasks for students1. How can we do image interpretation in
QGIS?
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References1.http://www.seo-sproject.eu/modules/remotesensing/remotesensing-c01-p01.html