Overview | Earthquake | Drought | Fire | Flood & Cyclones | Landslide& Soil Erosion | Volcano
Remote Sensing based drought Information System for Palar and Thamiravaruni basins using GIS
Modules of drought Information System
DIS consists of menu driven modules developed for accessing, organizing, manipulating, querying, analysing and displaying the drought related information. Each module has menus, which can be invoked by clicking with mouse. The Graphical User Interface (GUI) of DIS is more interactive and user-friendly created in Microsoft Visual Basic. Visual Basic was used as front end, MS-Excel as back end for handling the attribute and temporal data and MapInfo for Maps. Object linking and embedding technique was used to link the MapInfo maps and Excel table & graphs with Visual basic. Attribute data can be accessed from map by clicking the respective objects. As MS-Excel was used as back end for various information, it can be accessed and updated without any difficulty. The DIS comprises of the following modules, as presented in Figure 1.
 Figure 1 Flow Diagram of Drought Information System  Figure 2 Study areas Map in Tamil Nadu Each module has two main menu namely Palar and Thamiravaruni. Each main menu consists of various optional menus, which in turn have submenus to access the relevant information of a particular module. Figure 2 represents the study areas in Tamil Nadu State. Water Related Database Module The water related database module has the menus to display the maps and information relevant to the drought analysis in the form of maps, tables and graphs. Maps were registered and digitized and relevant attribute data were attached to the respective objects of the map using MapInfo GIS software. The menus such as river basin, administrative block boundary, raingauge location, well location, anicut location, land use are incorporated in this module. Each map can be accessed by invoking the respective menus. The attribute data for each map can be retrieved by clicking the respective objects of the map using the mouse. Mean monthly, monsoon seasonal, and crop seasonal spatial rainfall pattern were determined which are presented in the form of tables and graphs. Thirty years of water level data were analysed and crop seasonal ground water fluctuation was calculated to view the exploitation pattern. Results of above analysis in tabular format and graphical representation can be accessed and updated from CSGW-Table and CSGW-Graph menus respectively. As there are more number of menus present in this module, analysis part was incorporated inside the menu within which submenus such as Mean, Monsoon, Crop season, CSGW-Table, CSGW-Graph, were presented. The above tables and graphs can be retrieved and updated easily from submenus of this module. Northeast and Southwest rainfall variation maps can also be accessed from NE-map, SW-map submenus of this module. |