Full text: Proceedings of the Symposium on Global and Environmental Monitoring (Part 1)

previous paragraphs) a selection of the image window 
correspondiog to superimposed part of a map sheet should be 
carried out. It is possible to do it empirically by comparing 
the map with the image hardcopy or with the image on the 
display screen. However T this method is not accurate too much 
and suitable for larger amount of data. 
It is better to select the image windows by means of image 
coordinates of the map sheet corners. They can be calculated 
by at t ine transformetiert front their - cartographic coordinates. 
Results of digital image processing have to be written on the 
film, »he film scanner/writer Photomation P 1700 Optronics is 
used for this purpose in our laboratory. 
the selection of the suitable print components is of special 
importance. It Is not good to overfill the photornap by the 
cartographic line content, but it is necessary to consider 
user s interest . Components for planimetry, geographic names 
or water are often used. 
The Carl Zeiss Jena precision rectifier Rectimat C was used 
for the color photomap production. Color photornap is a color 
composite superimposed with selected map print components. 
Three color components must be succesively introduced into the 
photo carrier of the rectifier and exposed with red, blue and 
green filters on the color film. 
A map content on the negative of cartographic fair draft is 
exposed with white light. Two cases of superimposing are 
possible 
a) exposure of reduced negatives placed in the photo carrier, 
b) exposure of negatives at original scale that are put 
straight on the photomaterial on the projection table of 
the rectifier. 
The second way is less elaborate and gives better legible 
cartographic line drawing on the photornap. 
C onclusion 
The method described has been successfully aopiied at Remote 
Sensing Centre of Geodetic and Cartographic Enterprise in 
Prague. Several photomaps sheet from North Bohemia and 
neighbourhood of Prague have been produced in this way. 
References 
[ 1 j Charvdt, K., Cervenka, V., Hylmar, F.: Production of 
1 50 000 Pseudocolor Photomaps from Thematic Mapper 
data. Symposium ICA, Budapest, 1989.
	        
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