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The results from the orthophoto satisfy the 
NATO A rating planimetric accuracy 
(CMAS=25m) for the 1:50 000 maps, 
equivalent to standard deviation of differences 
of £8.3m. 
Although no extensive tests were performed at 
these stage, the overlay between vector data and 
the digital orthophotography demonstrated a 
good fit between the two types of data. The 
visual identification of changes was much easier 
than the one from the satellite image and was 
supported very well with the image processing 
capabilities of the CARIS system. 
5.0 CONCLUDING REMARKS 
As a result of the map revision pilot project, 
CCM's in-house expertise in vector data 
generalization, raster image processing, and 
raster and vector data integration has increased. 
Having completed the derivation of the pilot 
area through the generalization of a 1:50 000 
data set, the requirements for data generalization 
to produce 1:250 000 data are very clear. In 
order to pursue this methodology, sixteen 
1:50 000 digital data sets covering the 
1:250 000 map are required. Although the pilot 
site was revised using Landsat TM imagery and 
the accuracy requirements are met, the team has 
some reservations concerning the sole use of 
Landsat TM imagery for 1:250 000 map 
revision. These reservations are based on the 
uncertainty in identifying and collecting certain 
features. Ancillary information will be required 
to improve the feature identification process 
(aerial photography, existing maps, field 
checks, etc.), as well as the use in the future of 
image segmentation techniques. The 
combination of the Helava system for the 
production of digital orthophotographs with the 
CARIS system offering real vector/raster data 
integration for the revision of existing digital 
spatial databases proved to be quite successful. 
It can be effectively implemented to a full 
production and quality assurance system. The 
production of image maps is also possible. A 
more thorough evaluation of this system 
integration and application for map revision 
from digital orthophotographs is in progress 
Vm the revision of an entire 1:50 000 map 
sheet. 
ACKNOWLEDGMENTS 
The contributions of the team members Gilles 
Auger, Art Dow, Rolland Dussault, Benoit 
Frappier, Héléne Lachance and Jeffrey Young 
are gratefully acknowledged. 
REFERENCES 
Bouloucos T., R. Kunarak, K. Tempfli (1992) 
"Low-cost feature extraction from aerial 
photographs for database revision", Inter. 
Archives of Photogrammetry and Remote 
Sensing, Vol. XXIX, Part B4, Com. IV, pp. 
493-498. 
Colvocoresses A.P. (1986) "Image mapping 
with the Thematic mapper", Photogrammetric 
Engineering and Remote Sensing, Vol. 52, No. 
9, pp. 1499-1505. 
Derenyi E.E. (1991) "Design and development 
of a heterogeneous GIS", CISM Journal 
ACSGC, Vol. 45, No. 4, pp. 561-567. 
Derenyi, E.E, T.Y. Shih (1991) "Digital map 
revision in a vector/raster environment”, internal 
paper, University of New Brunswick. 
Halim M., E. Derenyi, R. Pollock, T.Y. Shih, 
C.K. Xian (1992) "Design and implementation 
of a GIS based digital image processing 
system", Inter. Archives of Photogrammetry 
and Remote Sensing, Vol. XXIX, Part B4, 
Com. IV, pp. 776-780. 
Mackaness W.A. (1991) "Integration and 
evaluation of map generalization", in Map 
Generalization edited by B.P. Buttenfield and 
R.B. McMaster, pp. 217-226. 
Turner. A.M., .D.R.... Stafford... (19087) 
"Operational revision of national topographic 
maps in Canada using Landsat images", ITC 
Journal 1987-2, pp. 123-128. 
USL (1992) "Guide to using image data in 
CARIS", Universal Systems Ltd. 
Welch R., T.R. Jordan, M. Ehlers (1985) 
"Comparative evaluation of geodetic accuracy 
and cartographic potential of Landsat-4 and 
Landsat-5 Thematic mapper image data", 
Photogrammetric Engineering and Remote 
Sensing, Vol. 51, No. 11, pp. 1799-1812. 
Welch R. (1989) "Desktop mapping with 
personal computers”, Photogrammetric 
Engineering and Remote Sensing, Vol. 55, No. 
11, pp. 1651-1662. 
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