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4. The First Respondent has filed a counter affidavit dated 23.06.2016, wherein it is inter alia stated as under:

i) Modern Survey using Global Positioning Systems (GPS) and Electronic Total Stations (ETS) is in progress in Perambalur Town and in 10 newly created Municipal Towns. In addition to the above, a pilot study was conducted and successfully completed in Uttangarai Taluk in Krishnagiri District, on the basis of which, Re-survey is proposed to be taken up in Kanniakumari, Krishnagiri and Ooty by using the modern techniques;

13. Per contra, the Learned Additional Advocate General for R1 to R7 strongly opposed to the relief sought for by the Petitioner in this Writ Petition, stating that 'Re-survey' is being conducted almost in various parts of the State, especially in the extended areas of Municipalities and Corporations. In consequence of introduction of modern survey equipments in re-survey, the fraudulent transaction with the Government lands has been curbed and curtailed. Tamil Nadu has the accurate land records for every bit of land, which was identified with the use of mathematically proven survey methodologies, in addition to surveying the Government lands with the help of the Global Positioning System (GPS) and Electronic http://www.judis.nic.in Total Station (ETS) so as to measure lands accurately. GPS can measure base lines for high accuracy and it controls points without any line of sight requirement, whereas ETS works on the principle of signal reflection and line of sight must be there between Total Station and Prism reflector. GPS is a more effective tool for establishing control point. However it cannot be used in areas with large tree cover, high rise buildings etc., because of satellite signal interference. Therefore, it was submitted that for surveying of lands in vast open areas, usage of GPS is resorted to and for surveying congested built–up areas with clear line of sight, ETS is effective. In Cadastral Survey, the scale of the map and precision of the instruments greatly influence its accuracy and hence, it was recommended to conduct the re-survey in the State using both DGPS and ETS.