Anna univ Remote sensing and GIS

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Introduction of remote sensing and GIS

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Anna univ Remote sensing and GIS

  1. 1. INTRODUCTION TOREMOTE SENSING  
  2. 2. Remote sensing is the science and artof obtaining information about anobject, area, or phenomenon throughthe analysis of data acquired by adevice that is not in contact with theobject, area or phenomenon underinvestigation.
  3. 3. Electro Magnetic Radiation Q = h f = h c/λ ( The energy of a quantum ) M = σ T4 ( Stefan-Boltzman law ) λm = A/T ( Wien’s displacement law )
  4. 4. Atmospheric Influences Absorption Scattering Rayleigh scatter Mie scatter Nonselective scatter
  5. 5. Image Acquisition Photographic Sensors Digital Data Earth Resource Satellites
  6. 6. Image Resolution Spatial resolution Spectral resolution Radiometric resolution Temporal resolution
  7. 7. Image Interpretation Shape Size Pattern Tone (Hue) Texture Shadows Site Association
  8. 8. ApplicationsLand Use/Land Cover MappingGeologic and Soil MappingAgricultural ApplicationsForestry ApplicationsRangeland ApplicationsUrban and Regional Planning ApplicationsWetland MappingWildlife Ecology ApplicationsArchaeological applicationsEnvironmental AssessmentOil ExplorationMineral ExplorationLandforms Identification and EvaluationWater Resource Applications etc.
  9. 9. ConclusionsA picture is worth a thousand words, because pictures concisely conveyinformation 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) Permanentrecording, iv) Broadened spectral sensitivity, v) Increased spatial resolutionand geometric fidelity, vi) providing data for inaccessible regions etc.Remote sensing will continue to play an increasingly broad and importantrole in natural resources management. The technical capabilities of sensors,space platforms, data communication systems, GPSs, digital imageprocessing systems, and GISs are improving on almost a daily basis. At thesame time, we are witnessing an evolution of various remote sensingprocedures from being purely research activities to being commerciallyavailable services. Most importantly, we are becoming increasingly awareof how interrelated and fragile the elements of our global resource basereally are and of the role remote sensing can play in inventorying,monitoring, and managing earth resources and in modeling and helping usunderstand the global ecosystem.

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