Development of Spatial Information System for Transportation Planning of Calicut Urban Area

  between various zones in study area is required for transportation planning and management activities. This information about the travel pattern between every origin-destination pair in an area is organized in the form of a matrix calLED trip matrix or Origin-Destination Matrix. Estimation of O-D matrices is one of the major issues transportation planning process. The O-D matrix can be estimated using techniques such as home interview survey, roadside interview survey, work place interview, etc. But, conduct of surveys involves large amounts of resources and thus these methods are expensive and time consuming. To overcome these difficulties, O-D estimation through simple link volume modeling philosophy has been adopted.

The model proposed by Vanzyulen and Willumsen (1980)based information minimization approach was used for estimation of O-D matrix from link volume information. The estimated O-D matrix was assigned was assigned on to the existing road network using all or nothing assignment technique.

5.0 Preparation of Desire Line Diagram
In desire line diagram the travel between various pairs of zones is represented by bands, whose width is proportional to the travel, drawn between the centroids of the zones. The desire line diagram is very useful in understanding the travel pattern in a study area and carrying out the capacity sufficiency or deficiency studies of the road network. Desire line diagram has got important application in this study. The MAP does not have any tools for preparation of desire line diagram. A macro 'desire' was written in AutoLISP to prepare the desire line diagram taking the travel information from the data file and graphic details of the zones from the graphic data file of the traffic zones. A desire line diagram prepared using the macro 'desire' is shown in Fig. 3.

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