additional task was to rectify a reference TC-photo, to 
evaluate the transformation parameters, and to transform 
all the CIR-orthoimages to PTC-images. 
To improve the outlined method the reference TC-photo- 
graph must be taken simultaneously with the CIR-photo- 
graphs. Another improvement can be done by using a 
non-linear transformation between the two colour spaces. 
At least some investigations will be done for producing 
PTC-images from a CIR-image without reference images. 
‘For this purpose a data set with - object specific - colour 
values has to be compiled. 
6. REFERENCES 
Bartl, R., Eichinger, E.V., Schneider, W., 1996. Land- 
nutzungserhebungen aus Luftbildern als Grundlage für 
wasserbautechnische Planungen. In: Österreichische 
Zeitschrift für Vermessung und Geoinformation. In press. 
Heipke, Ch., 1993. Performance and state-of-the-art of 
digital stereo processing. In: Fritsch/Hobbie (Eds.): Pho- 
togrammetric Week '93. Wichmann Verlag, Karlsruhe, 
pp. 173 - 183. 
Mansberger, R., 1992. Ein System zur visuell-digitalen 
Zustandsbeurteilung von Baumkronen auf Farb-Infrarot- 
Luftbildern. Dissertation. Universität für Bodenkultur. 
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Reeves, R. G., Anson, A., Landen, D., 1975. Manual of 
Remote Sensing. American Society of Photogrammetry, 
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International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B7. Vienna 1996