zon, 
ral, the specific geomorphological and geological shapes or any 
other detail that would be required by the theoretical or practi- 
cal research. 
3.3.2. The coordinates of each point after suitable  transforma- 
tions, finally refer to the system of the left picture. 
Based on these coordinates, it is possible to have useful elements 
concerning distances between points, dimensions of local anomalies 
inclinations size of the rocks,directions of faults,sections etc. 
3.3.3. It is also possible, if it would be considered useful for 
special studies,to converse measurements in suitable systems con- 
nected with the rock. 
3.4. In order to achieve the accuracy, that is provided in every 
case, special attention is required during the measurements. 
3.4.1. This is of great importance for the case of terrestrial 
takings, relatively to the measured points. Details safely identi- 
fied on both photographs; are chosen. It is a decisive factor in 
order to determine the degree of taking advantage by the great ac- 
curacy possibilities of stereo comparator. 
3.5. In the case of studying the whole area in order to form spe- 
cific records and to attend as time passes, we must consider a 
lot of factors and limitations. Thus : 
3.5.1. In the case of terrestrial taking, the following must be 
considered : 
The covering by each pair area in connection with the possibili- 
ties to incline the instruments of terrestrial takings. 
Difficulties of various origins in aiming. 
Suitable choice of stations and taking advantage of all the possi- 
bilities of taking from each station. 
Connection of stations with airphotos elements etc. 
3.5.2. In the case of airphotos in various scales we must mainly 
refer to inabilities to aim points because of great inclination. 
3.6. In spite of the above, it is considered that the combination 
of study, terrestrial takings and airphotos is successul. 
3.7. Furthermore we could mention that the case of inclined air- 
999