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PHOTOGRAPHIC INTERPRETABILITY 
as generally indicative of detail types. 
For the purposes of this discussion it is considered that recogniz- 
able object sizes on the ground can be expressed in terms of their 
lineal dimensions or dimension classes, and that this is one of the 
basic factors involved in recognition or interpretation of recorded detail. 
  
  
  
  
  
  
NOMINAL KIND OF 
CLASS |OBJECT SIZE |SIZE RANGE DETAIL 
FEET 
LAND COASTLINES 
GU 500 300-1000 | LAKES 
MOUNTAINS 
MEA CITIES 
RA s 200 100-300 | HARBORS 
VEGETATION PATTERNS 
; INDUSTRY 
ROSS : HIGHWAYS 
* DETAIL 50 30-100  |,IRPORTS 
SHIPPING 
TRAFFIC DETAIL 
a. ACTIVITY 20 10-30 |INDUSTRIAL DETAIL 
© PATTERNS HOUSING 
URBAN DETAIL 
  
  
ACTIVITY EQUIPMENT 
5. ePECIFICS 5 3-10 [MATERIAL STORAGE 
IDENTIFYING DETAIL 
FINE PEOPLE 
d 2 -3 COMMUNICATION DETAIL 
VEGETATION 
  
  
  
  
  
  
GROUND DETAIL CLASSIFICATIONS 
FIGURE | 
DETAIL CONTRAST 
Another such basic factor is the contrast of the detail. For the 
purposes of this discussion the photographic definition of contrast is 
used, namely, the log brightness ratio of the detail to its background. 
Work by Carman and Carruthers and others has established evi- 
dence that the contrasts of significant ground detail in all class groups 
is extremely low. Figure 2 indicates such a typical distribution of 
detail contrasts at ground level as a function of the frequency of their 
occurrence. This data indicates that about 90% of all detail exists at 
contrasts of 0.1 or less. This appraisal may turn out to be pessimistic 
because of the size of scanning slit used in the determinations, but 
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acteristic of the particular emulsion. Does this