IX-B4, 2012 
acquire updating 
nine whether they 
including format 
ation and edge 
lata source into a 
alysis; (5) detect 
the aid of image 
on edit the smaller 
from larger scale 
| updated features 
le data and record 
Feature relations 
Adjustment 
  
d'dateb : Verification : 
  
  
: software | 
  
  
low 
3 and the practical 
nding system can 
o-spatial database 
softwares have 
lere are no mature 
database updating 
integrated strategy 
art of functions of 
provided by the 
er parts based on 
f National 1:50000 
is developed and 
| and development 
  
International Archives of the Photogrammetry, Remote Sensin 
g and Spatial Information Sciences, Volume XXXIX-B4, 2012 
XXII ISPRS Congress, 25 August — 01 September 2012, Melbourne, Australia 
  
  
  
  
  
   
  
  
  
  
    
Figure 3. National 1:50000 geo-spatial database updating 
system based on map generalization 
The system has following fundamental functions, (1) data pre- 
handling for format transformation, map projection, data layers 
reorganization; (2) geometry and attribute editing; (3) change 
detection, feature selection and generalization; (4) detecting 
confliction among features and data quality check. 
The production line system was applied in 24 provincial 
production agencies and over 500 suites are installed and put 
into data updating production of the project of 1:50k 
topographical database updating. So far now, about over 3000 
map sheets of 1:50k topographical data are produced using this 
generalization software with high production efficiency. 
5. DISCUSSION AND FUTURE WORK 
Updating is an essential step in geo-spatial database life cycle. 
If data are not regularly updated the results and decisions 
deduced from spatial analysis are unreliable. However, 
realizing this step is a very difficult task. The updating of geo- 
spatial databases is becoming a big challenge for many national 
and local surveying and mapping organisations in the world. 
In this paper, the demands of updating based on generalization 
arc analyzed in detail, and the outline of geo-spatial databases 
updating is described based on map generalization technology, 
including the basic principle, work flow and implementation. 
The practical application shows generalization-based updating 
method is very promising for multi scale database updating, 
especially in China for the integrating national level database 
fesources and regional level database into the whole national 
Spatial data Infrastructure in the future. 
However, much additional work is still required. A more 
thorough Investigation in the generalization process is required, 
change detection, map generalization, confliction detection and 
updating quality check operation require more automatic and 
Intelligent, 
6. REFERENCES 
C.B. Jones, A.I. Abdelmoty, M.E. Lonergan, P. van der Poorten 
and S. Zhou 2000,“Multi-scale spatial database design for 
online generalization”. 9th International Symposium on Spatial 
Data Handling, Beijing, International Geographical Union, 
7b.34-44, 2000 
T. €hen, ZL.^13, 3. Jiang, R.L. Zhao, 2002,"Key Issues of 
Continuous Updating of Geo-spatial Databases", Geomatics 
World, 2(5),1-5 
C. Heipke, 2002, "Requirements for modern GISs", In: 
Proceedings of ISPRS Commission II Symposium, CHEN Jun, 
JIANG Jie Eds, pp.173-179, Xi'an, Aug.20-23, 2002 
A. Cooper, and A. Peled, 2001, “Incremental Updating and 
Versioning”. Proceedings of the 20th International Cartographic 
Conference, pp. 2806-2809, Beijing, August, 2001 
Z. L. Li, 1999, “Scale: A fundamental dimension in spatial 
representation”. Proceedings of the International Symposium on 
Digital Earth, Eds. G. Xu and Y. Chen . ISDE, Beijing, China. 
Science Press, Beijing, China, 1999, 1:533-538. 
T. Kilpeläinen. and T. Sarjakoski, 1995, Incremental 
generalization for multiple representations of geographic 
objects, in: Lagrange J. P. and Weibel R., GIS and 
Generalization, Taylor & Francis, London, 1995, 209-218. 
T. Badard and C. Lemarié, 1999, "Propagating updates between 
geographic databases with different scales". Chapter 10 of 
Innovations in GIS VII: GeoComputation, Atkinson, P. and 
Martin, D. (Eds.), Taylor and Francis, London, 1999. 
Z'L li H Yan, T. Ai, T. Chen.,2004, *Automated building 
generalisation based on urban morphology and Gestalt theory", 
International Journal of Geographical information Systems, 
2004, 18(5): 5113-534. 
D. Lee, 2001,“Generalization in the new generation of GIS”. 
Proceedings of the 20th International Cartographic Conference. 
Beijing, 2001, 2104-2109. 
359