A direct comparison of overall accuracy between IKONOS
and CASI (only including habitats surveyed by both
sensors) revealed that CASI provided significantly ( P < .01)
more accurate maps (81% vs. 64%, Fig. 3). Indeed, if a
thematic accuracy of >70% is required at a fine level of
habitat discrimination, CASI is the only suitable instrument
among those compared, although obtaining coverage of
large areas (1000 km2) is expensive (Fig. 6). If accuracies
of ca. 50 – 60% are acceptable, IKONOS is only costeffective
for small areas ( < 100 km2
). Texture made no