This guidance is a revision and update of the 1994 guidance on
thematic accuracy assessment for the NPS Vegetation Inventory
(Environmental Systems Research Institute et al. 1994). The
revision incorporates the sampling design and analysis principles
described by the 1994 version as a sound starting framework and by
augments them with practical experience gained by the NPS and its
cooperators and contractors at more than 100 NPS parks over 15
years. NPS staff informally interviewed many individuals in and
outside the NPS who have been involved in project production and
oversight. We evaluated specifically thematic accuracy assessment
practices in the field and in analysis at more than 30 NPS parks.
As a result, this guidance is designed to be scientifically sound,
but also practical to implement. While it specifically addresses
NPS objectives, it may also be found useful as guidance for other
organizations that assess the accuracy of vegetation maps.
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