Hon'ble Chief Minister
Selvi J Jayalalithaa




TNGIS Users
No. of Departmental Users :338
No. of Public Users               :343
Tamil Nadu Geographical Information System (TNGIS)
TNGIS
The Geographical Information System (GIS) is a tool for managing, analysing, decision making by seamlessly combining both spatial and non-spatial data. In Tamil Nadu, a vast spatial data have been generated through GIS Projects undertaken by several Departments. The basic issue in these projects are to utilize huge volume of existing data sets for decision making process. Different agencies are developing GIS on different platform leading to inability to scale up and is also not cost effective. One more issue is the source data variation that leads to Spatial / locational inaccuracy of information and mismatch in data. The other constraint in data usage is updation of data overtime, use of appropriate tools (proprietary versus open source software tools) in managing the data sets. Hence, the Project, Tamil Nadu Geographical Information System (TNGIS) is conceived with an ultimate objective to create a generic model of GIS and to easily integrate with other available data sets. This will provide an uniform GIS platform over the State. Geographical Information is necessary to take decisions in various Government Departments as well as providing services to the citizens. It is proposed to establish a Digital Maps Repository which would serve these purposes
Scope Of TNGIS
Scale 1:50,000 to start with, Datum – World Geodetic System 84 (WGS 84), Projection Traverse Mercator (TM) Standards have been proposed by the Core Committee Identification and classification of layers and segregation of layers for public domain and closed domain including authentication mechanism. Sharing of the base layers proc used from Survey of India to collate and consolidate layers from various Departments at appropriate scales and to study the requirements and appropriate integration, etc., through enabling Government Orders. Integration of datasets including those related to Population Census, Agriculture, Public Health, Rural Development, Economics and statistic etc. To build necessary infrastructure for proper access and usage of Geographical Information System across various Departments.
Phase 1
Spatial Data procured from survey of India should be made sharable through enabling Government Orders. This data needs to be corrected for the current administrative setup; consolidating the efforts already put in by the nodal departments by pooling all the other available layers, establishing the necessary structures and framework at the first stage. A tentative timeline is fixed as 1 year for completing this exercise.
Phase 2
Augmenting the efforts made in the 1st phase, the Geographical Information System would enhance its repository with other department specific applications. Additional layers for various departments and spatial layers at larger scales for urban application could be made. The spatial data sets of different application proposed to be developed will initially use the Survey of India base maps at 1:50,000 scale as the reference for the entire State. The handholding support meant for districts shall work in coordination with the state Tamil Nadu Geographical Information System technical team. It is expected that during the first phase, there would be requirements for orientation / awareness / workshops on data preparation (spatial and non spatial) for the departments, awareness among user departments (who are not using Geographical Information System currently), capacity building on open source tools, etc., and to impart 'Train the Trainers' Programs during end phase I and beginning of Phase II in districts, so that the trained personnel could impart further training to more number of officials from their respective departments Training Programme could be conducted at Chennai as well as in some of the District Headquarters depending on the requirement.
Stake Holders
No Name of the Department / Institution
1 Commissionerate of Survey and Settlement (COSS)
2 Rural Development Department
3 Institute of Remote Sensing (IRS), Anna University
4 Agricultural Engineering Department (AED)
5 Institute of Water Studies
6 Highways Department
7 Forest Department
8 Tamil Nadu Water Supply and Drainage Board
9 Directorate of Town and Country Planning
10 Directorate of Municipal Administration
11 Tamil Nadu Electricity Board
12 Directorate of Primary Health
13 Sarva Siksha Abhiyan (SSA)
Spatial Data Infrastructure
TNGIS The Geographical Information System (GIS) is a tool for managing, analyzing, decision making by seamlessly combining both spatial and non-spatial data. In Tamil Nadu, a vast spatial data have been generated through GIS Projects undertaken by several Projects. The basic issue in these projects are to utilize huge volume of existing data sets for decision making process. Different agencies are developing GIS on different platform leading to inability to scale up and is also not cost effective. One more issue is the source data variation that leads to Spatial / locational inaccuracy of information and mismatch data. The other constraint in data usage is updation of data overtime, use of appropriate tools (proprietary versus open tools) in managing the data source. Hence, the the Project, Tamil Nadu Geographic Information System is conceived with an ultimate objective to create generic model of GIS and to easily integrate with available data sets. This will set uniform GIS platform our State. Geographical Information is required to take departmental decisions in various Government Departments in providing services to the citizens. It is proposed to establish a Digital Maps Repository which would serve the above mentioned purpose..
SDI components
A SDI should enable the discovery and delivery of spatial data from a data repository, via a spatial service provider, to a user. As mentioned earlier it is often wished that the data provider is able to update spatial data stored in a repository. Hence, the basic software components of an SDI are:
SDI Component SDI Components of Tamil Nadu
GIS software (Thick client or desktop) - to create , update and process spatial data QGIS, GvSig UDig OSS Desktop ArcGIS Desktop Properatory Softwere 6 Licences Geoserver & MapServer – OSS GIS Servers
Software client - to Display, Query, and Analyse spatial data (this could be a browser or a desktop GIS) Browser based application developed using OSS
Spatial Data repository - to store data, e.g., a spatial database It is a State level Spatil Data Repository Governed by State Government RDBMS : PostgreSQL 9.3 with PostGIS 2.0
Methodology for Spatial Layer Updation Each layer’s owner should have privilege to update their own data. Additional Values added by others also updated through actual Owner on original layer.
    Besides these software components, a range of (international) technical standards are necessary that allow interaction between the different software components. Among those are geospatial standards defined by the Open Geospatial Consortium (e.g., OGC WMS, WFS, GML etc.) and ISO (e.g., ISO 19115) for the delivery of maps, vector and raster data, but also data format and internet transfer standards by W3C consortium.

Standards (Web GIS)

OGC Web Maps Service SDI Components of Tamil Nadu
OGC Web Map Services Yes
OGC Filter Encoding Yes
Style Layer Descriptor Yes
Geography Markup Language Yes
OGC Web Map Context Yes
Server OS Linux Linux ( CentOS)
Web Server/Application server TNGIS Apache TNGIS Apache Tomcat
RDBMS TNGIS PostgreSQL 9.x with PostGIS 2.x
GIS Server TNGIS GeoServer 2.x TNGIS MapServer 7.x
GIS Desktop TNGIS QGIS, UDig & GvSig
Front End TNGIS PHP, Java Script, jQuery, HTML 5 & CSS 3
Framework TNGIS GeoExt
Front End Map UI TNGIS Leaflet

List of Spatial Data Contributed/Shared by Various Departments/Institutions

 
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Welcome to TNGIS – TN State Spatial Data Infrastructure
User Name
Password

Any State/ Central Government Department employee may request their Department’s Nodal GIS officer / TNeGA to register once in TNGIS Portal by providing minimum details. Administrator will approve your request and send e-mail with necessary User id & Password.
  • View all spatial layers which are available to view for the General Public and the Department specific layers
  • Switch On & off layers
  • Overlay desired spatial layers published by various Government Departments, Institutions and Universities.
  • Administrator will assign the privileges for individual user depending on their Department and Designation on all restricted layers and Menu Options
Welcome to TNGIS – TN State Spatial Data Infrastructure
User Name -Email
Password
RegistrationForgot Password?
Any Citizen can register once in TNGIS Portal with their valid e-mail address and Mobile no. Registered Public user can access GIS with following facilities
  • View spatial layers available for the General Public

  • Switch On & Off layers

  • Overlay Desired spatial layers published by various Government Departments, Institutions and Universities.