GVII-9 (Sup.) 
Hereafter, the interpretation refers to this rectangle. 
Every such rectangle is given points showing the 
value of the forest and the ground under consideration what 
is to be paid if a power transmission line is placed along 
the area. In the same way the stereomodels are studied to 
give points for the influence of topography and ground on 
the building or construction costs for the transmission 
line. At the same time, the risk for integument of ice on 
the power line is considered. 
In the same way, points are determined for every 
area as to transportation costs and roadbuilding costs. 
Of course, it will also be found during the photo 
interpretation if there are any circumstances which def 
initely are prohibitive for placing the transmission line 
in a given area, 
6, Every second photograph has now the grid mentioned 
above and figures showing the points for forest value, 
ground value, building costs, transportation costs, road 
costs, etc. These figures are transferred to the base 
maps, mentioned in point 2 above, 
7, These maps are joined to each other to form a 
long strip map of the area. A piano thread is fastened 
in a fixed point in one end of the long map, a point 
through which for other reasons the transmission line 
must go. The thread is thereafter guided between pins 
to the other end of a map where another fixed point is 
given. The distance between the two points are about 
100 km on the ground, or about 5 m on the map. The 
position of the thread is marked on the maps with a 
colored pencil and the length of the thread is observed 
at the other fixed point, 
8, All the cost-points along the thread, showing 
forest value, etc,, are summarized which will give a 
general view of the relative costs for this position of 
the line. 
9, Other locations of the line are tested in the 
same way and so the tendency of how the costs will vary 
for different alternatives will be found. 
10, When the best alternative or alternatives have 
been found, more careful interpretation along these 
band shaped alternatives will be carried through. This 
will give an important check of the results of the first 
interpretation which canno.t be’very detailed for time