Page 11 - Microsoft Word - DIGITAL ATLAS THOOT-1

comprises of the districts viz. Madurai, Theni, Dindigul, Sivagangai, Ramanathapuram,

Pudukkottai, Virudhunagar, Tirunelveli, Thoothukkudi, and Kanniyakumari.

Sources and Generation of Digital Data Base
a. Administrative boundary maps for the ten southern districts of Tamilnadu have

been procured from Census of India, Chennai.

b. The SOI toposheets of 1:50000 scale relevant to the ten southern districts viz.
Madurai, Theni, Dindigul, Sivaganga, Pudukkottai, Ramanathapuram,

Virudhunagar, Tirunelveli, Thoothukkudi, and Kanniyakumari have also been
purchased from SOI, Chennai.

c. Satellite Data for the ten southern districts has been procured from National

Remote Sensing Centre, Hyderabad to prepare the land use database.
d. Primary Census Abstract of population details and village level administration

data for the year 2001 has been collected from the Census of India.
e. Geographic Background details have been drawn from National Information

Centre, Government of India.
f. Geology and Soil data has been referred from the National Atlas Thematic

Mapping Organisation

g. Metrological data from the Public Works Department and IMD, Chennai.

Software Used
Arc GIS 9.3, ERDAS IMAGINE 9.2, VB.Net 2006 and other supporting basic

Software’s that are helpful for the preparation of maps and compiling into the VB.Net

environment. The collected Toposheets related to the study area were scanned using A0
scanner at 300 DPI in order to convert it in to digital format and facilitate digitization.

The satellite data product was imported in GIS platform for digital image classification.
The following major themes pertaining to the study area have been appropriately

considered at various levels, study area as a whole, each one of the district with their

respective CD blocks. The theme maps thus created for the study area as well at various
levels are as follows: