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The Design of Online GIS.
Online GIS utilizes the Internet to distribute the interactive maps and other spatial/ non spatial data derived. This will maximize the use of mapping and analyzing capabilities to a wide variety of departmental and non departmental audience without any time restrictions. The schematic of economical design for such a system is shown in Fig.4,5 and 6 below.


Figure 4 Web based Integration Scheme



Figure 5. Software Architecture



Figure 6. Software Modules



2.0 Phases of Implementation
The GIS system has to be implemented in phases so as to meet the current and future needs of the utility. Phasing the development of GIS functionality in an electric utility is vital as a stepping ladder for modular growth. The proposed case study is planned in six phases.

Phase 1 Creation of BASE Map data

• The Base Map should be three dimensional with building captured with an accuracy of 50 cms with spot heights ,generated in the scale of 1:500 (inclusive of road width)
• Ground contours with 1 m contour interval to be represented with a positional accuracy of 12.5 cms.
• GPS Control points for geo-referencing
• Land Base data enriched with data by field survey & verification showing all the salient features in different layers .

Phase 2 Creation of Distribution Network Layout
The Distribution Network Layout has to be created on the Base Map in different layers covering HT,LT and Consumer details exactly as per site conditions with all offset measurements. Customer indexing work shall add the exact geographical location of each customer to the customer database created. It shall also be ensured by field verification at the field level so that all the consumers are properly covered. Examples of locating an network element and Consumer in the GIS environment is given below in Fig 7 & 8.


Figure 7. Locating a Cable



Figure 8. Locating Consumers

Phase 3 - Maintenance

• Maintenance modules of all network components
• Operations manual of all network components
• Inventory Management

Phase 4 –Interfacing and planning.

• Call Centre interface
• Field staff scheduling
• Optimum/shortest route calculation

Phase 5 -Network Analysis

• Load Model
• Network Simulation and Analysis
• Network Tracing
• Load flow programs and operating instructions
• Fault Recording and History of Network components as given on fig 9.

Figure 9. Fault Recording

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