column. The five shapes^ for each cull cross-section are coded as follows: (1) 



rectangular (R) , (2) circular (C) , (3) elliptical (E) , (4) pie-shaped (P) , and (5) 

 annular (A) . 



For Grade Classification (Cubic Feet) 



A grade may be assigned to each portion of the tree between measured diameters. 

 The grade can be any two-character alphanumeric code. 



COMPUTER REQUIREMENTS 



The program is written in FORTRAN IV (IBSYS) for operation on the IBM 709X series, 



and in FORTRAN IV [G or H level) for operation on IBM System 360 computers. It uses 



three logical input-output units corresponding to the functions of card reader, printer, 



and card punch. Storage required on the IBM 709X series computers is about 16,000 words, 

 and on the IBM System 360 model 67 about 65,000 bytes are used. These requirements do 

 not include the input-output subroutines. 



Source decks of this program may be obtained from the authors. 



PREPARATION OF DATA FOR INPUT 



Input to the program consists of a preliminary set of five control cards that 

 identify the run and select options for the final problem, followed by the cards con- 

 taining the tree data for the first problem. Subsequent problems would each consist 

 of four control cards followed by the corresponding tree data. 



Tree data are entered into the computer memory through the subroutine READIN. Two 

 versions of this subprogram are supplied with the program, one for entering data from 

 felled trees, and the other for entering dendrometry data. Specifications for tree 

 data to be read by one or the other of these versions are given below. However, the 

 user may wish to revise the READIN subprogram to suit his specific needs. Information 

 to help a programer revise READIN is provided later in this paper. 



SELECTION OF OPTIONS 



A run consists of all data processed at one execution of the program. A run may 

 consist of one or more problems, which are in turn divided into plots. One card selects 

 certain options for the entire run. Three cards for each problem select input-output 

 options and specify units, top limits, stump heights, log lengths, and data format. 

 Finally, a card heading each set of plot data determines the plot summary option. 



The format for each of these five option cards and the function each field serves 

 are indicated below: 



Option 



Value 



Column 



Name 



Format 



RUN OPTION CARD 

 Run number 



Print a combined summary 

 of all problems? 



xxxx 



Yes = 1 

 No = 



1-4 

 6 



lAPNO 

 lAPSUM 



14 

 II 



^ The coding provides for 10 shapes, but is now implemented for only these five shapes, 



6 



