ISPRS, Vol.34, Part 2W2, “Dynamic and Multi-Dimensional GIS", Bangkok, May 23-25, 2001 
217 
Fig. 6 
If we display the circles we draw in the steps of LAA, we have 
Fig. 7. 
Fig. 7 
Fig.8 and Fig.9 show the process of BLAA, the circles in Fig.8 
are drawn when we are searching for the object in the road layer 
which is nearest to the vehicle point. Whereas the circles in Fig.9 
are drawn when we get the temporary table and do the 
correcting in the temporary table. 
4. CONCLUSIONS 
LAA can correct the warps accurately and can simulate the real 
vehicle point to the largest extent. The algorithm can also deal 
with some special circumstances such as crossroads. 
But, from the scheme of LAA, we know that to correct one point 
we must query at least 3 tables many times, if the tables are very 
large, it will take much time to query a table, it is obviously not 
suitable for a real time condition. 
Fig. 8 
Fig. 9 
And also, there are many special points that are not discussed in 
this paper, LAA can’t deal with those conditions. But we will 
confront them in real work. To solve these problems, further 
research is expected. 
5. REFERENCES 
MapBasic Professional Reference, 3 rd Edition October, 1996 
MapBasic User’s Guide, 3 rd Edition October, 1996 
Maplnfo Professional^.5) Reference 
Maplnfo Professional^.5) User’s Guide