| Table 7. Contingency matrix and calculated errors
for the thematic accuracy assessment of the vegetation association map of
Allegheny Portage Railroad National Historic Site. |
| Accuracy Assessment Observation |
Mapped Association |
Total |
Error of Comission (Percent Correct) |
| Alder Riverine Shrubland |
Allegheny Hardwood Forest |
Conifer Plantation |
Dry Eastern Hemlock - Oak Forest |
Eastern Hemlock - Northern Hardwood Forest |
Eastern Hemlock - Tuliptree - Birch Forest |
Japanese or Giant Knotweed Herbaceous Vegetation |
Modified Successional Forest |
Northern Hardwood Forest |
Northern Red Oak - Northern Hardwood Forest |
Reed Canarygrass Riverine Grassland |
Sparsely Vegetated Cliff |
Successional Old Field |
Sugar Maple Floodplain Forest |
Tuliptree - Beech - Maple Forest |
Wet Meadow |
| Alder
Riverine Shrubland |
1 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
1 |
100.00% |
| Allegheny Hardwood Forest |
|
13 |
|
|
|
|
|
3 |
1 |
5 |
|
|
|
|
1 |
|
23 |
56.52% |
| Conifer Plantation |
|
|
4 |
|
|
|
|
1 |
|
|
|
|
|
|
|
|
5 |
80.00% |
| Dry Eastern Hemlock - Oak Forest |
|
|
|
2 |
|
|
|
|
|
|
|
|
|
|
|
|
2 |
100.00% |
| Eastern Hemlock - Northern Hardwood Forest |
|
1 |
|
1 |
5 |
|
|
|
|
|
|
|
|
|
|
|
7 |
71.43% |
| Eastern Hemlock - Tuliptree - Birch Forest |
|
|
|
|
|
2 |
|
|
|
|
|
|
|
|
|
|
2 |
100.00% |
| Japanese or Giant Knotweed Herbaceous Vegetation |
|
|
|
|
|
|
3 |
|
|
|
|
1 |
|
|
|
|
4 |
75.00% |
| Modified Successional Forest |
|
2 |
|
|
|
|
|
13 |
1 |
|
|
|
|
1 |
2 |
|
19 |
68.42% |
| Northern Hardwood Forest |
|
4 |
|
|
|
|
|
|
16 |
|
|
|
|
|
1 |
|
21 |
76.19% |
| Northern Red Oak - Northern Hardwood Forest |
|
2 |
|
|
|
|
|
2 |
2 |
3 |
|
|
|
1 |
|
|
10 |
30.00% |
| Reed Canarygrass Riverine Grassland |
|
|
|
|
|
|
|
|
|
|
1 |
|
|
|
|
|
1 |
100.00% |
| Sparsely Vegetated Cliff |
|
|
|
|
|
|
|
|
|
|
|
5 |
|
|
|
|
5 |
100.00% |
| Successional Old Field |
|
|
|
|
|
|
|
|
|
|
|
|
22 |
|
|
1 |
23 |
95.65% |
| Sugar Maple Floodplain Forest |
|
|
|
|
|
|
|
|
|
2 |
|
|
|
3 |
|
|
5 |
60.00% |
| Tuliptree - Beech - Maple Forest |
|
|
|
|
|
|
1 |
|
|
|
|
|
|
|
1 |
|
2 |
50.00% |
| Wet Meadow |
|
|
|
|
|
|
|
|
|
|
|
|
1 |
|
|
3 |
4 |
75.00% |
| Total |
1 |
22 |
4 |
3 |
5 |
2 |
4 |
19 |
20 |
10 |
1 |
6 |
23 |
5 |
5 |
4 |
134 |
|
Error of Omission
(Percent Correct) |
100.00% |
59.09% |
100.00% |
66.67% |
100.00% |
100.00% |
75.00% |
68.42% |
80.00% |
30.00% |
100.00% |
83.33% |
95.65% |
60.00% |
20.00% |
75.00% |
|
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
Total Points
Correct |
97 |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
Overall Accuracy |
72.40% |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
Kappa Index |
68.70% |
|
| |
|
|
|
|
|
|
|
|
|
|
|
|
90%
Confidence Interval for Kappa Index |
6.90% |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Biological Informatics Program 
U.S. Department of the Interior |
U.S. Geological Survey
