, '--»uvhii-WH-ua» 
^filVER-NR-020-iCT" 
,"^-RIVER-NR-04B 
^ RI VER-NR-021 
VER-NR-023 
RIVER-NR-025 
III V* til-Mil-u 6 b 
RIVER-NR-063 
VER-NR-043 
AX' 
RIVER-NR-024«^ RIVFR-NH-04B 
RIVER -NR -030 
IVER-NR-048- 
Driver-nr-os 7 
^RIVER-NR-050 
'-RIVER -NR -063 
Fig. H1 : Binary hydrographic map Fig. H2 : Symbolic representation of the river network 
corresponding to a 5 km 2 area obtained from Fig. H1 
in northern Portugal (Agueda) 
Fig. H3 : Backprojection in Fig. H1 
of some of the classified rivers 
(represented by solid lines) 
Fig. H4 : Part of Spot image, XS1 band, Aug. 87, 
registered to the map of Fig. H1. One river and 
the contents of the image in its corresponding 
environment are shown 
Fig. H5 : Landcover data 
in river-environment 
Fig. H6 : DTM data 
in river-environment 
Fig. H7 : Existing road data 
in river-environment 
Fig. H8 : Optimized line 
operator response in 
river-environment 
658 
Fig. H9 : New network extracted 
in river-environment (white)