Fort Necessity National Battlefield: Accuracy Assessment Matrix

Table 6.� Contingency matrix and calculated errors for the thematic accuracy assessment of the vegetation association map of Fort Necessity National Battlefield.

Accuracy Assessment Observation	Mapped Vegetation Association								Total	Error of Commission (Percent Correct)
Accuracy Assessment Observation	Conifer Plantation	Red Maple - Black Cherry Successional Forest	Northern Red Oak - Mixed Hardwood Forest	Successional Old Field	Sugar Maple Basswood Forest	Tuliptree Forest	Wet Meadow	White Oak - Mixed Hardwood Forest	Total	Error of Commission (Percent Correct)
Conifer Plantation	10	1							11	90.90%
Red Maple - Black Cherry Successional Forest		9	1			1		1	12	75.00%
Northern Red Oak - Mixed Hardwood Forest			4		1	2		2	9	44.40%
Successional Old Field				9					9	100.00%
Sugar Maple� Basswood Forest									0	N/A
Tuliptree Forest			3			3			6	50.00%
Wet Meadow				1			5		6	83.30%
White Oak - Mixed Hardwood Forest			2			4		4	10	40.00%
Total	10	10	10	10	1	10	5	7	63
Error of Omission (Percent Correct)	100.00%	90.00%	40.00%	90.00%	N/A	30.00%	100.00%	57.10%
							Total Points Correct			44
								Overall Accuracy		69.80%
								Kappa Index		64.80%
					90% confidence interval for Kappa Index					10.70%


Table 7.� Contingency matrix and calculated errors for the thematic accuracy assessment of the vegetation association map of Fort Necessity National Battlefield with three hardwood forest types lumped.

Accuracy Assessment Observation	Mapped Vegetation Association						Total	Error of Commission (Percent Correct)
Accuracy Assessment Observation	Conifer Plantation	Red Maple - Black Cherry Successional Forest	Successional Old Field	Sugar Maple�� - Basswood Forest	Wet Meadow	White Oak + Northern Red Oak + Tuliptree Forest	Total	Error of Commission (Percent Correct)
Conifer Plantation	10	1					11	90.90%
Red Maple - Black Cherry Successional Forest		9				3	12	75%
Successional Old Field			9				9	100%
Sugar Maple - Basswood Forest							0	N/A
Wet Meadow			1		5		6	83.30%
White Oak + Northern Red Oak + Tuliptree Forest				1		24	25	96%
Total	10	10	10	1	5	7	63
Error of Omission (Percent Correct)	100.00%	90.00%	90.00%	N/A	100.00%	88.90%
	Total Points Correct							57
	Overall Accuracy							90.50%
	Kappa Index							87.20%
	90% confidence interval for Kappa Index							7.70%