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Table 1

Comparison of macrophyte percentage area coverage derived from the 3 spatial monitoring techniques assessed over the same spatial extent within Prospect Reservoir and Landsdowne Lake. Handheld PDA Trimble mapping data was collected by two trained independent field teams; sidescan and satellite imagery was digitised by two trained independent technicians.

  Prospect Reservoir   Landsdowne Lake  
  Team/ technician I (%) Team/ technician II (%) Team/technician I (%) Team/technician II (%)
Digitised sidescan imagery 24.21 37.14 15.31 12.16
PDA Trimble mapping 18.62 21.98 8.02 13.80
Digitised satellite imagery 53.31 45.99 18.12 17.48

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