Image Classification
Compare a Satellite Image with a Classification

Figure 1: Satellite image of the area of Düsseldorf, Germany. 
Source: www.flaechennutzung.nrw.de	
Figure 2: Classified image of the area of Düsseldorf, Germany. 
Source: www.flaechennutzung.nrw.de	

Legend class	Colour	Area percentage	
High degree of sealing (> 80%)			
Medium degree of sealing (40–80%)			
Low degree of sealing (< 40%)			
Waste deposit sites, gravel-pits, building sites		-	
Agricultural land			
Grassland and pasture			
Coniferous forest			
Mixed forest			
Deciduous forest			
Water bodies			

1.	Complete the legend by adding the right colour to the 10 land cover classes. Following colours are given: yellow – light green – medium red – blue – lime green – dark red – grey – light red – dark green – medium green.
2.	Estimate the area percentage of each land cover class (be sure not to exceed 100 % in total).
3.	Name reasons why a classification is useful? 
4.	True colour satellite image or classified image? Name advantages and disadvantages of true colour and classified satellite images and where they are most useful.