Vegetation Classification and Mapping Project Report - USGS
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Vegetation Classification and Mapping Project Report - USGS

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<strong>USGS</strong>-NPS <strong>Vegetation</strong> <strong>Mapping</strong> Program<br />

Colonial National Historical Park<br />

Table 12. Contingency matrix <strong>and</strong> calculated errors for the thematic accuracy assessment of the original vegetation map for Colonial National Historical Park. Cells highlighted in gray show the number of sampling points<br />

that were correct.<br />

Accuracy Assessment Observation<br />

Acidic Oak - Hickory Forest<br />

Coastal Plain / Piedmont Floodplain Swamp<br />

Forest (Green Ash - Red Maple Type)<br />

Coastal Plain / Piedmont Small-Stream<br />

Floodplain Forest<br />

Coastal Plain Calcareous Seepage Swamp<br />

Coastal Plain Loblolly Pine - Oak Forest<br />

Mapped <strong>Vegetation</strong> Class (Reference Data)<br />

Acidic Oak - Hickory Forest 5 2 7 71%<br />

Coastal Plain / Piedmont Floodplain Swamp Forest (Green Ash - Red Maple Type) 1 2 1 4 25%<br />

Coastal Plain / Piedmont Small-Stream Floodplain Forest 4 4 100%<br />

Coastal Plain Calcareous Seepage Swamp 5 5 100%<br />

Coastal Plain Loblolly Pine - Oak Forest 12 1 1 14 86%<br />

Coastal Plain Mesic Calcareous Ravine Forest 1 1 100%<br />

Disturbed Tidal Hardwood Swamp 3 3 100%<br />

Golden Bamboo Shrubl<strong>and</strong> 2 2 100%<br />

Loblolly Pine Plantation 4 4 100%<br />

Mesic Mixed Hardwood Forest 3 24 1 3 31 77%<br />

Non-Riverine Saturated Forest 2 2 4 50%<br />

Piedmont / Coastal Plain Oak - Beech / Heath Forest 1 4 5 80%<br />

Salt Scrub 4 4 100%<br />

Semipermanent Impoundment 1 1 NA<br />

Successional Black Walnut Forest 3 3 100%<br />

Successional Mixed Scrub 1 1 1 3 NA<br />

Successional Tuliptree - Loblolly Pine Forest 6 1 3 1 1 25 37 68%<br />

Tidal Bald Cypress Forest / Woodl<strong>and</strong> 1 5 6 83%<br />

Tidal Freshwater Marsh 6 7 86%<br />

Tidal Mesohaline <strong>and</strong> Polyhaline Marsh 1 4 7 12 33%<br />

Tidal Oligohaline Marsh 3 1 21 25 84%<br />

Tidal Shrub Swamp (Wax Myrtle Type) 1 1 100%<br />

Gr<strong>and</strong> Total 5 3 6 5 20 4 3 2 5 30 4 5 5 4 1 30 5 10 5 30 1 183<br />

Error of Omission (Percent Correct) 100% 33% 67% 100% 60% 25% 100% 100% 80% 80% 50% 80% 80% 75% 0% 83% 100% 60% 80% 70% 100%<br />

Total points correct 136<br />

Overall Accuracy 74.3%<br />

Kappa Index<br />

72.8%<br />

90% Confidence Interval 5.7%<br />

Coastal Plain Mesic Calcareous Ravine<br />

Forest<br />

Disturbed Tidal Hardwood Swamp<br />

Golden Bamboo Shrubl<strong>and</strong><br />

Loblolly Pine Plantation<br />

Mesic Mixed Hardwood Forest<br />

Non-Riverine Saturated Forest<br />

Piedmont / Coastal Plain Oak - Beech /<br />

Heath Forest<br />

Salt Scrub<br />

Successional Black Walnut Forest<br />

Successional Tree-of-Heaven Forest<br />

Successional Tuliptree - Loblolly Pine Forest<br />

Tidal Bald Cypress Forest / Woodl<strong>and</strong><br />

Tidal Freshwater Marsh<br />

Tidal Mesohaline <strong>and</strong> Polyhaline Marsh<br />

Tidal Oligohaline Marsh<br />

Tidal Shrub Swamp (Wax Myrtle Type)<br />

Gr<strong>and</strong> Total<br />

Error of Commission (Percent Correct)<br />

64

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