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Public Information System using GIS-GPS integration

Rama Narayanan P.A.
Rama narayanan P.A.
arun_anna2000@yahoo.com

Prabu Sankar S
Prabu sankar S.
prabusankar_ks@yahoo.co.in

Raja Vijay Singh G.
Raja Vijay Singh G.
rajavijaysing@yahoo.co.in


Study Area Description
Chennai is the capital of TAMIL NADU and fourth largest city in INDIA. It has a substantial amount of population who depend on the government transport buses for the daily transport.

Geographical location:
Latitude: 13.04 N
Longitude: 80.17 E

Data Sources
This paper requires sufficient amount of spatial as well as non-spatial data to implement the integrated system. These are listed below:

Spatial Data
  • Line Data
    Road map of Chennai city at 1:2000 scale supplied by CMDS, Chennai.
  • Point Data
    Location of metropolitan transportation corporation buses provided by the GPS receivers. The control point co-ordinates obtained by GPS survey.
Non-Spatial Data
The following non-spatial data are to be collected by numerous ground surveys through out the Chennai city.
  • Road names and addresses
  • Corporation speed data for various roads
  • Road conditions
  • important land marks
Map Digitization

Required Map Accuracy
The digital map forms the heart of this real time automatic vehicle location system. The end user is going to monitor the position and the path of his vehicle on this map. The map has to be user friendly and should give important landmarks around the area so that the user knows the ground location of the vehicle. The accuracy of the map is around 3 meters.

The positional accuracy of this map is also a very important factor to consider. This is because of two important reasons. They are:
  • The whole objective of the paper is to display the position of the vehicle and hence if the map is not accurate enough, the high precision GPS coordinates would not be of any use. Also, since the coordinates of any vehicle are going to be changing quickly the map should display these changes effectively.
  • The communication link of the system is going to introduce certain errors because accurate systems require high costs and infrastructure. Hence, the map needs to be accurate enough to offset the uncertainty in position caused by weak signals.
Map Scanning and Vectorization
The map obtained should be first scanned and it can be stored in a digital format.

Next, the scanned map should be vectorized using onscreen digitization. Once the whole map is digitized it can be imported to Arc Info software as coverage. Using the edit features of Arc Info, the various node errors are removed and labels can be added to denote various roads and streets.

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