 Online edition of India's National Newspaper Wednesday, Sep 17, 2008 ePaper | Mobile/PDA Version |
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Tamil Nadu
CHENNAI: A pilot project will be implemented at Cuddalore and Nagapattinam as a first step towards establishing a Geographic Information Systems (GIS) across the State. GIS is an important tool for managing, analysing and making decisions, by seamlessly combining both spatial and non-spatial data. In Tamil Nadu, a vast volume of spatial data sets has been generated through GIS projects undertaken by several departments and agencies. The challenge is to integrate and coordinate these varied, disparate efforts, to build a GIS structure for the State as a whole. The Cuddalore-Nagapattinam project is a first step towards this larger objective of building TNGIS. A meeting was held under the chairmanship of M. Naganathan, vice-chairman, State Planning Commission, on Tuesday to discuss the issues involved and to set the broad framework. The basic issues addressed in this project are the need for data/information in decision making and to utilise the huge volume of existing data sets in various departments that are underutilised / unutilised. It is also observed that the source-wise variation leads to spatial / locational inaccuracy of information and mismatch in spatial boundaries. Similarly, the varied data formats and its interoperability pose constraints in data utilisation. The other constraints in data usage are data update over time, capacity building and the tools available viz. proprietary versus open source tools in managing the spatial and non-spatial information. Above all, the developed datasets need to be integrated with the National Spatial Data Infrastructure (NSDI) and the required framework for wider dissemination over Intranet or / and Internet based solutions. The Spatial and other Non-spatial information (digital and conventional) were collated from varied sources in the government domain and the discrepancies in the boundaries, scale and the co-ordinate systems removed for establishing the required authentic layers for these districts. District boundary, as provided by Survey of India at 1:50 K scale in WGS 84 projection has been standardised as the common boundary, keeping in mind the integration of all spatial layers under State Spatial Data Infrastructure proposed in TNGIS, and later with National Spatial Data Infrastructure (NSDI). More than 70 layers / themes for each district under Administrative, Health, Educational, Transport, Water Resources, Physical Resources, Land use patterns, Watersheds and Water Quality have been integrated by National Informatics Centre, Chennai, using Open Source GIS Software that has brought down the cost of the project drastically. Web GIS (http://tngis.tn.gov.in) has been adopted as the technology to provide interface for the various datasets keeping in mind the large number of users who would show interest to view the same. The layers are themes that are made available with necessary hardware to the nodal departments in districts who are authorised to add / edit them for further value addition. The generic software model created will enable faster replication of the GIS application to other districts and easy integration with attribute datasets later by the District GIS Administrator for establishing the larger objective of Tamil Nadu GIS (TNGIS).
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