3.- Tests on the Cartographic Configuration of Topographic Photo Maps 1:25.000 
In consideration of the principles pointed out in the previous paragraph, several tests on 
the cartographic configuration of a topographic map 1:25.000 have been performed in the Institut 
für Angewandte Geodäsie. 
3.1. - Orthophoto Plan and Contour Line Representation Serving as Source Material - The ortho- 
photo plan 1:25.000 has been prepared by means of the black-and-white aerial photographs 1:65.000 
taken by Messrs. Hansa Luftbild, Münster, on behalf of the State Survey office Hesse on 22 sep- 
tember 1971 with a Wild RC8 15/23 (flight altitude above ground approx. 10.000 m). The orthophoto 
plan covering the area of the map sheet 5215 "Dillenburg' of the Topographic Map 1:25.000 of 
the Federal Republic of Germany, is composed of two stereo models. For measuring and storing 
the terrain profiles required for the ortho projection, a Zeiss Planimat with Storage Unit SG 1 
(storage method) has been used, the model scale having been 1:25.000. The second stereo model 
has directly been coupled to the first stereo model so that all terrain profiles required for the map 
sheet "Dillenburg" have coherently been recorded on the profile storage plate. The distance between 
the measuring profiles amounted to AXp1a = 8 mm. The orthoprojection with simultaneous recor- 
ding of the contour line representation has been performed in the Orthoprojector GZ1 connected to 
the Scanning Unit LG 1, the transmission ratio having been 1:1. As the orthoprojector is equipped 
with an optical interpolation device, the lateral tilts By running vertically to the profile axes are 
rectified up to 35°. As no strip be strip interpolation has been performed, the strip width in the 
orthophoto also amounted to AX 1 - 8mm. The photographic projection of the orthophoto has 
been performed on Gevatone Film N 31 p that of the contour line representation on Gevatone Film 
N 41 p (Agfa Gevaert). 
3.2. - Printing Originals - The orthophoto plan and the contour line representation 1:25.000 
have first been covered by a mask according to the sheet lines. 
Thus we obtained as printing originals : 
1. Aerial Photograph Foil 
2. Contour Line Representation. 
In order to make the landscape represented inthe aerial photograph topographically evident - 
as has been pointed out in paragraph 2 - the aerial photograph foil has also been used for preparing 
by means of phototechnical procedures separations of tonal values (and from these some masks) : 
Forest Mask Foil 
Field Mask Foil 
Forest Structure Foil 
6. Field Structure Foil 
CO 4 Co 
Manually have been prepared (by tracing from the orthophoto plan) : 
7. Road Mask Foil 
8. Hydrography Mask Foil 
9. Railroad mask Foil. 
Manually have also been prepared : 
10. Contour Line Representation (engraving) 
11. Valley Mask foil (hill shading) 
12. Settlement Mask Foil 
13. Hydrography Names Foil 
14. Margin/Grid Foil (engraving). 
As basis for the contour line representation (engraving) served the contour line repre- 
sentation (listed under No. 2) obtained by means of the Electronic Contourliger HLZ. The valley 
mask foil shows a valley shading of the most important valleys, prepared according to the course 
of the contour lines. The settlement mask foil indicates the result of the delimitation between 
settlement (built-up area) and field or forest. The margin/grid foil also contains the names of 
the settlements (place names). 
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