Overlaying GIS technique has been used to find the growth that occurred between
different time periods. Cross-tabulation has helped determination of which land-use
of the earlier date has been replaced by which new land-use. This helps to determine
and explain spatial land-use change patterns. The results of change detection using
overlaying are shown in figure 4. Important to mention in that a 25 m error could be
accepted in digitizing 1:50,000 scale topographic maps