experiments performed by e.g. Coulombe et al. (1989) and 
Marceau et al. (1989) confirm our experience that textural 
features indeed improve the classification results over 
multispectral classification only. On the other hand, 
classification with textural features seem not to produce 
results reliable enough for topographic mapping. Methods for 
road detection have been proposed and tested by various 
authors, most of them based on high resolution airphotos 
(e.g. Graga 1987). Wang & Newkirk (1988) have shown 
promising results for detection of highways in Landsat TM 
imagery. They use similar prediction logic for road 
connecntions etc. However, the predictions are not used to 
initiate further image analysis (feedback) to detect more roads 
by more sensitive algorithms. 
Further development and operational use of the system is not 
yet determined. A fruitful way to go to create an operational 
system could be to integrate the image interpretation software 
with a commercial GIS/image processing sytem. 
7. References 
1. Esbensen, K, & Geladi, P. 1989. Strategy of Multivariate 
Image Analysis (MIA). Chemometrics and Intelligent 
Laboratory Systems, 7(1989)67-86, Elsevier Science 
Publishers B.V., Amsterdam. 
2. Graça, L.M. 1987. A Concept for Automatic Change 
Detection in Revision of Topographic Maps by Means of 
Digital Image Processing and Pattern Recognition 
Techniques. M.Sc. thesis, International Institute of 
Aerospace Survey and Earth Sciences. 
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4. Haralick, R.M.; Shanmugam, K. & Dinstein, I. 1973. 
Textural Features for Image Classification. IEEE Transaction 
on Systems, Man and Cybernetics, Vol. SMC-3, no. 6, 
November 1973. 
5. Marceau, D.; Howarth, P.J. & Dubois, J.M. 1989. 
Automated Texture Extraction from High Spatial Resolution 
Satellite Imagery for Land-Cover Classification: Consepts 
aod Application. Proceedings of IGARSS ‘89, Vancouver, 
anada. 
6. Wang, F. & Newkirk, R. 1988. A Knowledge-Based 
System for Highway Network Extraction. IEEE Transactions 
on Geoscience and Remote Sensing, Vol. 26. No. 5, 
September 1988. 
7. Wang, J.F. & Howarth, P.J. 1987. Automated Road 
Network Extraction from Landsat TM Imagery. ASPRS- 
ASCM Annual Convention Proceedings, Vol. 1, pp. 429- 
438. 
8. Solberg, R.; Fiskum, S. & Giffen, M.C. 1990. Detection 
of Urban Areas by Interference Filtering. IGARSS "90, 
Proceedings, Vol. III, pp. 1995-1999, May 1990, 
Washington D.C., USA. 
9. Solberg, R.; Fiskum, S. & Giffen, M.C. 1990. Semi- 
Automatic Revision of Topographic Maps. ISPRS 90, 
Proceedings of the Symposium on Cartographic and Data 
Base Applications of Photogrammetry and Remote Sensing, 
Vol. 28, No. IV, pp. 155-164, May 1990, Tsukuba, Japan. 
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