951 
A.6 MODULE DISPL. 
AND UNITS 
by using two 
, centroids; 
y digitizing a 
contructed 
to the 
b)classes for 
btained by 
ble (relation 
rements table 
linking it with 
ale III, section 
md their in- 
map on the 
i suitability 
>e digitized 
, because this 
lit maps are 
1 program than 
.1 and RAMTEK 
i image file 
:ntroids of the 
:entroid can be 
t is indicated 
n. The result 
i centroids and 
on 1, Table 
with attribute 
ection I.a, 
a menu for 
p requirements 
o edit an 
it table (see 
p requirements 
I). Also 
Schema A.1 Survey of modules and their interaction 
MODULE ATTTAB 
V ; 
IAttr.menu! MODULE MAPDIG 
! MODULE MUTCRT 
V 
! V 
V 
¡Map description! 
! ¡Crop req.\ 
¡Map unit! 
; 
\ ¡table \ 
¡table 
MODULE MAPCEN 
¡' ¡' 
; 
V 
¡Centroid - map unit! 
! table ! 
MODULE PRINT ! 
! MODULE MATCH 
V ! 
! Hard copy ! ! 
! table ! ! 
V 
¡class - colour code table ! 
¡Hamm.dist - col.code table I 
¡Matching data [ 
MODULE DISPL 
V 
!Image file! 
MODULE PRINT 
V 
1 Hard copy 1 
! map ! 
For the map unit table map unit names must be given 
and for the crop requirements table the class name 
(crop names) and their subclass names. By cursor 
movement the attributes and the values for each item 
in the table(s) can be choosen from the attribute 
table constructed in module ATTTAB (see section A.3). 
The map unit names are used in the module MAPCEN (see 
A.2) to classify the centroids. 
A.5 MODULE MATCH. 
This module is used to match two tables: a map unit 
table and a crop requirements table (both constructed 
by module MUTCRT see section A.4). 
For each class (crop) a colour code must be specified 
for its subclasses by choosing from a menu of 
colours. 
It also registrates the measure of mismatch for each 
map unit. This measure is the Hamming distance to a 
full match (if result is TRUE, TRUE, FALSE, FALSE the 
Hamming distance to a full match - i.e. TRUE, TRUE, 
TRUE, TRUE - is 2). For each possible distance also a 
colour must be specified. 
The result is a table with map units and colour codes 
and a table with Hamming distances and colour codes. 
Further for each map unit and subclass a decimal 
coded number is given for the (mis)match (for example 
- 1=TRUE, 0=FALSE 1,1,1,0 =12; 0,1,1,1 =7; 1,0,0,1 
=9). This information is the input for module DISPL 
(see section A.6). 
This module is used to display land suitability maps 
on the screen. By using a menu the class (crop) to be 
displayed can be choosen. Further there is a choice 
between a full match picture or partly match picture. 
A full match picture shows the possible units to grow 
different subclasses of a crop, a partly match 
picture shows the land units and their distance to a 
full match for the best suitability class of a crop.