Lesson: Remote sensing imagery Zirek Malikova OShTU, Software Engineering Department...
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Transcript of Lesson: Remote sensing imagery Zirek Malikova OShTU, Software Engineering Department...
Lesson: Remote sensing imageryZirek MalikovaOShTU, Software Engineering [email protected]
Module: Data Acquisition and data interpretation
Objectives:
1. Definition of remote sensing.2. Basics of remote sensing.3. Remote sensing software.4. Tasks for students.5. References.
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]
Basics of remote sensing
•Physical basics•Satellite systems•Visual image interpretation•Image processing and enhancement•Classification techniques
Physical basics
•electromagnetic spectrum, •radiation and absorption principles, atmospheric influences
•Energy interpretation with earth surface features
•spectral reflectance properties
The electromagnetic spectrum
Energy Interaction with Earth Surface Features
Specular and diffuse reflectance.
Satellite orbits•Geostationary orbit(METEOSAT)
Synchronous (polar) Orbit (LANDSAT)
Satellite sensors
Active sensors Passive sensors
Resolutions
•Spatial•Spectral•Radiometric•Temporal
Spatial resolution
•Low resolution: larger 30 m•Medium resolution: 2-30 m•High resolution: under 2 m
Spectral resolutions
LANDSAT and SPOT spectral resolution
Visual image interpretation1. the recognition of objects2. a true interpretation
Schematic presentation of the Interpretation Process.
Image enhancement• Histogram Stretches
• Filter
Image classification
Unsupervised Classification
Supervised Classification
The classification process
Remote sensing software
•ERDAS
•MapInfo•ESRI•AutoDesk•IDRISI•RemoteView
Open source
• GRASS GIS• QGIS• OSSIM
Tasks for students1. How can we do image interpretation in
QGIS?
References
1.http://www.seo-sproject.eu/modules/remotesensing/remotesensing-c01-p01.html