anna univ remote sensing and gis

11
INTRODUCTION TO REMOTE SENSING

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Introduction of remote sensing and GIS

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Page 1: Anna univ Remote sensing and GIS

INTRODUCTION TO

REMOTE SENSING 

Page 2: Anna univ Remote sensing and GIS

Remote sensing is the science and art of obtaining information about an object, area, or phenomenon through the analysis of data acquired by a device that is not in contact with the object, area or phenomenon under investigation.

Page 3: Anna univ Remote sensing and GIS

Q = h f = h c/ (The energy of a quantum)

M = T4 (Stefan-Boltzman law)

m = A/T (Wien’s displacement law )

Electro Magnetic Radiation

Page 4: Anna univ Remote sensing and GIS

Atmospheric Influences

Absorption

Scattering Rayleigh scatter

Mie scatter

Nonselective scatter

Page 5: Anna univ Remote sensing and GIS
Page 6: Anna univ Remote sensing and GIS
Page 7: Anna univ Remote sensing and GIS

Image Acquisition

Photographic Sensors

Digital Data

Earth Resource Satellites

Page 8: Anna univ Remote sensing and GIS

Image Resolution

Spatial resolution

Spectral resolution

Radiometric resolution

Temporal resolution

Page 9: Anna univ Remote sensing and GIS

Image Interpretation Shape

Size

Pattern

Tone (Hue)

Texture

Shadows

Site

Association

Page 10: Anna univ Remote sensing and GIS

Applications Land Use/Land Cover Mapping Geologic and Soil Mapping Agricultural Applications Forestry ApplicationsRangeland ApplicationsUrban and Regional Planning ApplicationsWetland MappingWildlife Ecology ApplicationsArchaeological applicationsEnvironmental AssessmentOil ExplorationMineral ExplorationLandforms Identification and EvaluationWater Resource Applications etc.

Page 11: Anna univ Remote sensing and GIS

Conclusions A picture is worth a thousand words, because pictures concisely convey information about positions, size, and interrelationships between objects. The basic advantages of images over the ground observation are i) Improved vantage point, ii) Capability to stop action, iii) Permanent recording, iv) Broadened spectral sensitivity, v) Increased spatial resolution and geometric fidelity, vi) providing data for inaccessible regions etc.  Remote sensing will continue to play an increasingly broad and important role in natural resources management. The technical capabilities of sensors, space platforms, data communication systems, GPSs, digital image processing systems, and GISs are improving on almost a daily basis. At the same time, we are witnessing an evolution of various remote sensing procedures from being purely research activities to being commercially available services. Most importantly, we are becoming increasingly aware of how interrelated and fragile the elements of our global resource base really are and of the role remote sensing can play in inventorying, monitoring, and managing earth resources and in modeling and helping us understand the global ecosystem.