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To build the spatial database is always the bottleneck work of the GIS (Geographic Information System). According to the estimation, the work will need about seventy or eighty percentage funds of GIS establishment. Generally speaking, the data we use is the digited data from map, which is made in the previous years, lackness of newly added roads. Such being the case, the fatest way to enlarge the database is to collect road data by GPS.The data we use are digital and GPS data. The traditional way to merge such two kinds of data is to do it by human experience, comparing and deleting the repeated part in digital data, merging the different parts between digital and GPS data. On the other hand, we still consider the smoothness of the curve while merging the data.
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