Use of Remote Sensing in Digital Model Elevation and its application and use

1. TAE – II
SUB : Survey II
Topic : Applications of Remote sensing
In
Digital Model Elevation

2. 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

3. 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.

4. 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

5. 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.

6. The quality of a DEM
 The 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;

8. Processing Of Data
 Following are the steps in processing
◦ Spatial resolution
◦ Spectral resolution
◦ Radiometric resolution
◦ Temporal resolution
◦ Radiometric correction
◦ Atmospheric correction

9. Satellite
 RADARSAT
◦ 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.

10. A typical view of Magellan (spacecraft)
Images taken by RADARSAT
TerraSAR-X

11. Error detection and correction
 Errors can be classified in two different categories
1. Positional errors
2. Attribute errors
 Both types of errors are introduced when DEMs are
created manually or automatically.
 It is necessary to consider certain criteria for their
detection and measurement

12. Software Used:
 TacitView from 2d3
 Socet 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.

13. References
 Schowengerdt, Robert A. (2007). Remote
sensing: models and methods for image
processing.
 www.wikipedia.com
 www.google.com/aedumenia.in
 Podobnikar, Tomaz (2008). "Methods for visual
quality assessment of a digital terrain model