EVALUATING THE ACCURACY OF A GRAVIMETRIC SURVEY 



157 



become variable. For example, with increase in the network density j i.e. 

 with decrease in the ratio — ) the vahie of Dr. increases, at the same time 



L 



the value Z),-^ decreases, as a result of which the total error D^ can remain 



unchanged. The value Eq^^ with decrease in — does not change, and E^^^ 



'o 

 decreases. By increasing the value of a, which causes an increase in Ef^^^^ , it 



60 



40 



30 



20 



01 



0-2 0-3 0-4 0-5 0-6 07 



Fig. 13. 



is possible to keep tlie total error £■,„ at the previous level. Thus, for certain 

 relationships between the parameters it is possible to find a number of 



pairs of values for a and — , for which the values of the total errors E^^ 



'o 



and D^ are maintained practically unchanged. Larger values of -— will 

 correspond to the smaller values of a, and vice versa. The corresponding 



pair of values of a and — is selected in accordance with technical and economic 



. . ^« 



considerations. 



EXPERIMENTAL CHECKS OF FORMULAE 



The obtained relationships were checked in a number of theoretical 

 examples. We will give the results of checking one of the more complicated 

 examples. 



