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on the X,Y-coordinate pairs. Operational map revision
procedures and monitoring programs will be based mainly
on these existing systems. If image data is intented to
provide input to data bases and models, vector GIS must
incorporate raster based image analysis functions,
especially functions that operate on regions of
connected pixels, as defined by polygons in GIS layers.
Future geographic information systems should provide
the user with a complete set of tools to generalize image
values for meaningful analysis units. For raster systems
this means expanding on the concept of region-based
GIS analysis. For vector systems it means integrating
image analysis functions. Statistical measures, as well
as spatial pattern indices can provide the base.
6. ACKNOWLEDGEMENTS
The author wishes to thank the SEIDAM project leader,
Dr. David G. Goodenough at the Pacific Forestry Centre,
for his valuable support.
The financial support from the Swedish Institute and the
Sweden-America Foundation is gratefully acknowledged.
The data for the case study was provied by the British
Columbia Ministry of Forests, the British Columbia
Minsitry of Environments Lands and Parks, and by the
Canada Centre for Remote Sensing.
Thank you also to my former collegues at Dept. of
Geodesy and Photogrammetry, KTH, for support in
practical as well as in scientific matters.
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