remote sensing in digital model elevation
DESCRIPTION
Use of Remote Sensing in Digital Model Elevation and its application and useTRANSCRIPT
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TAE – IISUB : Survey II
Topic : Applications of Remote sensing In Digital Model Elevation
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Submiteed By:Shishir M.Meshram (A-71)Piyush R.Nimje (A-72)Akash Dehankar (A-73)Akhil Karumuri (A-74)Faizan R.Khan (A-75)
Submitted To:
Dr. B.V.Khode
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Remote Sensing.Remote sensing is the acquisition of information about an
object or phenomenon without making physical contact with the object.
It is done through the Electromagnetic rays signals.Use of aerial sensor technologies to detect and classify
objects on Earth by means of propagated signals.Remote sensing makes it possible to collect data on
dangerous or inaccessible areas.Remote Sensing is broadly classified in 2 types
◦ Active Sensing.
◦ Passive Sensing.
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Digital Elevation Model(DEMs)A digital elevation model (DEM) is a digital representation
of ground surface topography or terrain.Digital Elevation Model are commonly built using remote
sensing techniques.Very much used to make terrain maps.The DEMs are generally prepared
◦ random ◦ systematic.
The terrain can only be described by Point Line Area
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Production
The older method includes the interpolation of contours for getting DEMs.
The electromagnetic rays are recorded and they processed
Digital elevation models may be prepared in a number of ways But two methods are common◦Two passes of a radar satellite.◦A single pass if the satellite is equipped with two
antenna.
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The quality of a DEMThe quality of Digital Elevation Model
depends upon the following points and the pixels◦Terrain roughness;◦Sampling density (elevation data collection
method);◦Grid resolution or pixel size;◦Interpolation algorithm;◦Vertical resolution;◦Terrain analysis algorithm;
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Processing Of Data
Following are the steps in processing◦Spatial resolution◦Spectral resolution◦Radiometric resolution◦Temporal resolution◦Radiometric correction◦Atmospheric correction
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SatelliteRADARSAT
◦ RADARSAT International (RSI) was formed in 1989 by a consortium to market, process, and distribute data worldwide from Canada's RADARSAT-1 Earth-observation satellite and the data is used for remote sensing.
Magellan (spacecraft)◦ Lauched by the U.S the Satellite provides world wide data.
TerraSAR-X◦ TerraSAR-X, a radar Earth observation satellite is a joint venture
being carried out under a public-private-partnership between the German Aerospace Center (DLR) and EADS Astrium.
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A typical view of Magellan (spacecraft)
Images taken by RADARSAT
TerraSAR-X
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Error detection and correction
Errors can be classified in two different categories
1. Positional errors
2. Attribute errorsBoth types of errors are introduced when DEMs are
created manually or automatically.It is necessary to consider certain criteria for their
detection and measurement
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Software Used:TacitView from 2d3Socet GXP from BAE Systems,TNTmips from MicroImages,PCI Geomatica made by PCI Geomatics, the
leading remote sensing software package in Canada,
IDRISI from Clark Labs,Image Analyst from Intergraph,and RemoteView made by Overwatch Textron
Systems.
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ReferencesSchowengerdt, Robert A. (2007). Remote
sensing: models and methods for image processing.
www.wikipedia.comwww.google.com/aedumenia.inPodobnikar, Tomaz (2008). "Methods for visual
quality assessment of a digital terrain model
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