Case 3 



A stand tallied at a set of 16 points. At each point, trees less than 3 inches 

 d.b.h. are recorded on a 1/256 acre plot. Trees greater than or equal to 3 inches 

 d.b.h. are tallied on a variable plot established by an angle gauge having a basal-area 

 factor of 40 square feet/tree. Then: 



FPA = 256. 

 BRK = 3.0 

 BAF =40.0 



established by recompiling BLOCK DATA 



on card #7 



IPT = 16 

 IBAP = 



Case 4 



All trees are tallied on 10 fixed-area plots of 1/5 acre. Then: 

 FPA = 5. (Reciprocal of 1/5 acres) 

 BRK = 9999. 

 IPT = 10 on card #7 



established by recompiling BLOCK DATA 



Case 



5 





same 



Plot 

 si zed 



si zes 

 plot 





FPA = 



1. 





BRK = 



9999 





IPT = 



1. 



established by recompiling BLOCK DATA 



on card #7 



SAMPR = - Z a 



where a^^ equals the area in acres of each of the n sample plots in the stand. 



Furthermore, if the sampling probability changes arbitrarily from tree to tree in 

 the stand, PROB(I] on card type #8 can be set to the reciprocal of the sampling 

 probability for that tree. In this way, it is possible to accommodate virtually any 

 sampling design including 3-P samples. 



32 



Cf U.S. GOVERNMENT PRINTING OFFICE: 1 97 3 _ 784-293 / 6 REGION NO. B 



