A study on Tamilnadu coastal deformation processes using SAR Interferometric data
Author(s)– German Amali Jecintha .T1, V.E. NethajiMariappan2
SAR systems take advantage of the long-range propagation characteristics of radar signal and the complex information processing capability of modern digital electronics to provide high resolution imagery. The paper focuses on the differential interferometric SAR (Synthetic Aperture Radar) technique for the monitoring of terrain surface deformations. A series of ERS (Earth Resources Satellite) 1&2 and ASAR (Advance Synthetic Aperture Radar) images acquired at different dates before and after tsunami were used in this study. Two SAR images are combined to produce a SAR Interferogram to reveal information about the third dimension (elevation) of the object and to measure small displacements of objects between the two image acquisitions. Interferometric processing, the SLC images were accurately co registered and the complex interferograms are formed by multiplying each complex pixel of the first image by the complex conjugate of the same pixel in the second image. Coherence images and interferograms were then derived from pairs of co- registered SLC images. The interferogram thus generated is a complex image itself. A careful observation of the images reveals that closer are the fringes, more are the topographical changes or height variations which represents the main observation for the estimation of the coastal deformations processes.
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Suitable site determination for urban solid waste disposal using GIS and Remote sensing techniques in Kottayam Municipality, India.
Author(s)– Nishanth.T, Prakash M.N, Vijith.H
Solid waste management is a global environmental problem in today’s world. There is an increase in commercial, residential and infrastructure development due to the population growth and this has negative impact on the environment. Urban solid waste management is considered as one of the most serious environmental problems confronting municipal authorities in developing countries. One of these impacts is due to location of dumping site in unsuitable areas. This paper deals with determination of suitable site for the disposal of urban solid waste generated from Kottayam Municipality and surrounding areas using GIS techniques.
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An Investigation of Groundwater Quality and Its Suitability to Irrigated Agriculture in Coimbatore District, Tamil Nadu, India – A GIS Approach
Author(s)- Balachandar. D, Sundararaj P, Rutharvel Murthy K, Kumaraswamy K.
The problems of water quality have become more important than the quantity, as the environmental problems are getting more serious in different parts of the world. A number of factors like geology, soil, effluents, sewage disposal and other environmental conditions in which the water happens to stay or move and interact with ground and biological characteristics. This influences greatly on the groundwater quality of an area. This study is made to evaluate the status of groundwater quality and its suitability to irrigated agriculture. For this study, 44 & 42 observation wells in 2005 and 44 & 39 observation wells in 2008 have been taken into consideration to study the variation in pre & post monsoon season. These observation wells are regularly maintained by Public Works Department of Government of Tamil Nadu. Water quality data are utilized in the present study for the analysis of groundwater chemistry of years 2005 and 2008 for both pre-monsoon (July) and post-monsoon (December) seasons. Water quality data used in the analysis include Electrical Conductivity (EC), Total Dissolved Solids (TDS), Total Hardness (TH) and Sodium Adsorption Ratio (SAR).
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