Office work to be done following field work 



Important steps in the operation 



Key points 



1. Record net voluine of each 



sample tree in space provided 

 on sampling form. 



Volumes read from appropriate volume 

 tables. Adjust volumes for any cull 

 that was recorded at time of measure- 

 ment o 



2. Add up volume of sample trees, 





3« Multiply total volume (ob- 

 tained in 2 above) by 

 sampling ratio. Enter this 

 final volume in space 

 provided. 



If the sampling form was not' completely 

 filled, the multiplying factor is 

 determined by dividing the number of 

 trees marked by the number of sample 

 trees measured on that particular 

 form. Or, if desired, multiply the 

 mean volume of the sample trees on 

 the form by the total tree count on 

 the form to get estimated total volume. 



4, Record net volume of each 

 large tree measured. 



Volumes read from same volume table 

 as used in 1 above. 



5. Add up volumes of large trees 





Check scale — office vjork 



Important steps in the operation 



Key points 



lo Determine correlation coeffi- 

 cient of estimated volume 

 and check scale volume. 



For each species and stratum, based 

 on previaus experience for similar 

 conditions. Can be computed after 

 check scaling a few trees for a basis. 

 See Appendix V of this publication. 

 This will be a refined estimate of 

 the correlation coefficient used in 

 step 4 under '^Preliminary office work." 



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