103 
Error magnitude is in the order of what we expect when processing 
small MSS sections by affine transformation. The vector diagram 
does not show significant systematic behavior. 
The good geometric quality is due to very expensive ground con- 
trol selection, using 1 : 50 000 topographic maps as a reference 
system (UTM). 
Thematic Map 
Apart from developing methodology, the final objective of project 
was to plott a thematic map of the bay of Paranagud, a region 
100 km east of Curitiba. This area is economically very important, 
incorporating the famous coffee harbour of Paranagud; it is 
ecologically very sensitive, as rigorous tree clearing in the 
nearby Serra do Mar mountains favours erosion and thus sedimen- 
tation in the navigable sea channel north and south of Ilha do 
Mel island. : 
  
  
  
  
  
  
  
Fig. 3 : LANDSAT MSS scene section (aprox 40 x 40 km) 
Acquisition date: July 15th, 1976 
Channel 4,5,6 composite (Original in colour)