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data files. 
The Combomap Anal program takes a secondary classification data file as 
input. It prints the data file in map format and prints a table of 
class pixel counts and hectareage. This program also maps separately a 
selected class by request. 
Each secondary data file of Old Machar Parish created by the Boundary 
Determ program was processed through the Combomap Anal program to 
generate maps and class area statistics (Table 1). Maps of residential 
lands were also printed by request. 
The Map Change Detec program compares secondary classification data 
files of the same location for two different years and determines the 
areas of change for a selected class. In the process four maps are 
printed with accompanying pixel and hectareage counts: (1) selected 
class present in the earlier year, (ii) selected class present in the 
later year, (iii) selected class added between the two years, and (iv) 
selected class lost between the two years. The map of pixels lost is 
also stored as a data set. 
The Old Machar secondary classification data files were processed by the 
Map Change Detec program to identify and quantify the areas of change in 
cropland (class A) between 1966 and 1981. Figure 1 shows the map of 
lost cropland generated by this program. 
The New Land Cover program compares a data file of lost pixels created 
by the Map Change Detec program with the classification map of the later 
date to determine the land cover which has replaced the lost class. A 
map of the new land cover and a table of pixel counts and hectareage of 
the new classes are printed. 
Old Machar cropland lost maps were processed through the New Land Cover 
program to produce the resultant new land cover maps and tables (Table 
3). 
The Land Capability program compares a map of lost agricultural pixels 
with a land capability map to determine the land capability lost. The 
program prints a map of land capability lost and a table of pixel and 
hectareage counts of the types of land capability lost. 
For the Old Machar study, a 4 NGS area—which contained over half of the 
cropland lost within the parish—was selected to analyze land capability 
lost. Land capability data files were based on land capability data 
gathered and classified by the Department of Agriculture and Fisheries 
for Scotland according to a seven-grade scheme. 
RESULTS AND DISCUSSION 
The data from remote sensing reveals that 321.2 hectares or 16 percent 
of the land classed as cropland (A) in 1966 had changed to another land 
cover or use by 1981. Most of the change was from cropland to either 
residential (R) or commercial/industrial (C) (Figure 1 and Table 3). 
Some of the cropland adjacent to urban developments has changed to 
permanent pasture (Z). This is probably an intermediate step before 
further urban encroachment brings about a residential or industrial use. 
Resultant agricultural data is compared with the farm census data of the 
Department of Agriculture and Fisheries for Scotland in Table 4.