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Methodology and Interpretation
PAGP - Percent pasture
The percentage of pasture land cover is calculated by dividing the number of
pasture land cover cells in the 3 km grid cell reporting unit by the total number
cells in the grid cell boundary minus those cells classified as water (total land
area). Animals grazing in pasture land may decrease vegetation cover possibly
leading to increased runoff. Livestock may also impair stream banks by trampling
riparian vegetation, which may cause increased sedimentation in the stream.
Quantile: Each class contains an approximately equal number (count) of features. A quantile
classification is well-suited to linearly distributed data. Because features are grouped by the number
within each class, the resulting map can be misleading, in that similar features can be separated into
adjacent classes, or features with widely different values can be lumped into the same class. This
distortion can be minimized by increasing the number of classes.
Natural Breaks: Classes are based on natural groupings of data values. Natural break points
are identified by looking for groupings and patterns inherent in the data. The features are divided
into classes whose boundaries are set where there are relatively large jumps in the distribution of
data values.
* EMAP-West Landscape Metrics Metadata (FGDC)
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