Mi Ran Kim, Jin Oh Choi

The KIPS Transactions:PartD, Vol. 8, No. 4, pp. 367-376, Aug. 2001
10.3745/KIPSTD.2001.8.4.367,   PDF Download:

Abstract

For the electronic map service by wireless, the existing map database cannot be used directly. This is because, the data volume of a map is too big to transfer by wireless and although the map is transferred successfully, the devices to display the map usually don't have enough resources as the ones for desktop computers. It is also not acceptable to construct map database for the exclusive use of wireless service because of the vast cost. We propose new technique to generate a map for wireless service dynamically, from the existing map database. This technique includes the generalization method to reduce the map data volume and filtering method to guarantee that the data volume don't exceed the limit of bandwidth. The generalization is performed in 3 steps : a step of merging the layers, a step of reducing the size of spatial objects, and a step of processing user interface. The filtering is performed by 2 module, counter and selector module. The counter module checks whether the data volume of generated map by generalization, exceeds the bandwidth limit. The selector module eliminates the excess objects and selects the rests, on the basis of distance.

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