Vegetation Classification and Mapping Project Report - USGS
Vegetation Classification and Mapping Project Report - USGS
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 />
CLASSIFICATION INFORMATION<br />
Status: The status of the Association in relation to the st<strong>and</strong>ard USNVC. Values for<br />
<strong>Classification</strong> Status are:<br />
St<strong>and</strong>ard - the Association has been formally recognized, described, <strong>and</strong> accepted by<br />
NatureServe Central Ecology as a st<strong>and</strong>ard Association in the USNVC.<br />
Nonst<strong>and</strong>ard - the Association has not been accepted by NatureServe Central Ecology as<br />
a st<strong>and</strong>ard Association (i.e., it does not follow the st<strong>and</strong>ard classification).<br />
Provisional* - the Association is a c<strong>and</strong>idate for acceptance into the st<strong>and</strong>ard<br />
classification but has not yet been comprehensively reviewed by NatureServe Central<br />
Ecology.<br />
Confidence: The degree of confidence associated with the classification of the Association.<br />
This confidence is based on the quality <strong>and</strong> type of data used in the analysis, as well as the extent<br />
to which the entire (or potential) range of the Association was considered. Values for<br />
Circumscription Confidence are:<br />
1 – Strong: <strong>Classification</strong> is based on quantitative analysis of verifiable, high-quality field<br />
data (species lists <strong>and</strong> associated environmental information) from plots that are<br />
published in full or are archived in a publicly accessible database. A sufficient<br />
number of high-quality plots covering the expected geographic distribution <strong>and</strong><br />
habitat variability of the vegetation type, as well as plots from related types across the<br />
region, have been used in the analysis.<br />
2 – Moderate: <strong>Classification</strong> is based either on quantitative analysis of a limited data set<br />
of high-quality, published/accessible plots, <strong>and</strong>/or plots from only part of the<br />
geographic range, or on a more qualitative assessment of published/accessible field<br />
data of sufficient quantity <strong>and</strong> quality.<br />
3 – Weak: <strong>Classification</strong> is based on limited, or unpublished/inaccessible plot data or<br />
insufficient analysis, anecdotal information, or community descriptions that are not<br />
accompanied by plot data. These types have often been identified by local experts.<br />
Although there is a high level of confidence that these types represent recognized<br />
vegetation entities, it is not known whether they would meet national st<strong>and</strong>ards for<br />
floristic types in concept or in classification approach if sufficient data were<br />
available.<br />
Comments: Comments about classification criteria used to define the Association, or to<br />
describe any remaining issues associated with the classification. Any potentially confusing<br />
relationships with other existing Associations should be indicated if there is a potential that<br />
further scrutiny may result in a change in the classification of the Association. Discussion of any<br />
atypical occurrences <strong>and</strong> why they are included in this Association concept may also be<br />
addressed. In addition, rationale for choosing nominal species that are not dominant <strong>and</strong> other<br />
comments about nominal species pertaining to the classification of the Association should be<br />
included. Comments may explain confusion about the similarity between types that may not be<br />
distinguishable.<br />
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