2. An estimate of the residue weight (in 

 tons) can be obtained if an appropriate 

 specific gravity is supplied. 



3. The length of each sampling unit is se- 

 lected by the user. 



4. Diameter and length classes to be used 

 in the output tables and the minimum 

 diameter and length limits are set by the 

 user. 



5. Per-acre figures can be adjusted for the 

 effects of slope if so desired. 



Inputs 



1. Title card 



2. Control card : 



a. Tables to be printed. 



b. Diameter-class width. 



c. Length-class width. 



d. Data-printing code. 



e. Conversion-ratio use code. 



3. Parameter card : 



a. Minimum diameter limit used when 

 sampling. 



b. Minimum' length limit used when 

 sampling. 



c. Slope — optional. 



d. Length of each sampling unit. 



e. Number of sampling units. 



f . Number of sampling units that were 

 subsampled. 



g. Specific gravity — optional. 



4. Data cards : 



a. Species code. 



b. Diameter at the point of intersection. 

 For pieces in the subsample, any or all 

 of the following items may be obtained. 



Both end diameters. 



Length. 



Defect. 



Classification code — assigned by the 

 user. 



Outputs 



1. A complete listing of the data cards — 

 optional. 



2. A summary of the sample data, showing 

 average volume (and weight if desired) 

 per acre, the input parameters, average 

 diameters, average length, etc. 



3. A set of nine tables, showing the data 

 summarized by diameter and length 

 classes. In addition to the final volume 

 and weight summaries, there are tables 

 showing the number of pieces and volume 

 in the subsample as well as tables showing 

 the intermediate steps used in obtaining 

 the final summaries. The user has the 

 option of printing all, none or any com- 

 bination of these tables. 



Discussion 



Sampling logging residues with the line- 

 intersect technique is a means of establishing 

 what has already happened. However, with 

 sufficient sample data, collected on past opera- 

 tions, timber managers may be able to predict 

 residue conditions on future timber sales. 

 And resource analysts could use line-inter- 

 sect sampling to monitor the residue situa- 

 tion over time so that future assessments of 

 changing utilization patterns can be made 

 readily. 



The REST system could be useful because 

 it was developed to help these people convert 

 basic data, with a minimum of effort and no 

 intermediate computations, to useful secon- 

 dary information. 



Program Availability 



Complete documentation of the REST sys- 

 tem is available upon request from the USDA 

 Forest Products Marketing Laboratory at 

 Princeton, West Virginia 24740. The user's 

 guide contains the program source listing, 

 input instructions and forms, and examples 

 of the printed output. 



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