Geoscience Reference
In-Depth Information
Figure 18.6
The heterogeneity of canopy, stem, understory, water, litter, and soil characteristics in the north-
ernmost
Phragmites
stand was used to calibrate the PROBE-1 data for the purpose of detecting
relatively homogeneous areas of
Phragmites
throughout the Pointe Mouillee wetland complex. The
most homogeneous area of
Phragmites
in the northernmost stand was in the vicinity of quadrat-
10. These pixels were used in the Spectral Angle Mapper (supervised) classification of PROBE-1
reflectance data.
likely locations of homogeneous
Phragmites
stands (Plate 18.2). Several of the mapped areas were
within the drier areas of the Pointe Mouillee wetland complex, which was typical of
Phragmites
observed in other diked Lake Erie coastal wetlands.
18.4.4
Accuracy Assessment
Tier-1 accuracy assessments that compared
Phragmites
maps to photointerpreted reference data
supplemented with field notes resulted in an estimated accuracy of 80% (
n
= 11) for the presence
