NDVI data for saddle snowfence, 1994.

A snowfence was built in 1993 on the Niwot Ridge Saddle
grid to determine the effects of changes in snowpack on a number of
variables, one of which was vegetation greenness (measured through
the normalized difference vegetation index). The study area of the
snowfence was 60m x 125m. Spectral data in the red and near infra-
red bands were recorded at sixty plots (points) in four rows located
approximately at 10, 25, 45, and 75 meters east of the fence (the drift
area). The plots were marked with thin wire stakes put into the ground
and flagged (for visibility) and given aluminum tags with their plot
identification code. All the plots were located in Kobresia myosuroides
communities. In each row there were ten plots located in control areas
just to the north and south of the area affected by the snowfence --
five to the north and five to the south -- and five plots located in
the drift area of the snowfence. The individual plots were broken into
groups of five according to their location (i.e., their distance from
the fence (row), and location within their row (north, south, or within
the snowfence area)). Within each of these groups, the plots were given
a number starting with one and going to five. The plots were then given
unique codes made up of plot type (c for control and sf for snowfence),
location within a row (for the control plots only - n for north and s
for south), the distance in meters of the row from the snowfence (10,
25, 45, or 75), and the number that uniquely identifies each plot within
a group (one through five). For example, the code cn10_1 represents plot
number one of the group of control plots north of the snowfence and 10
meters east of the snowfence. The location of each plot was measured as
set of coordinates within the snowfence area. The southern terminus of
the snowfence was used as the origin, with the y-axis running along the
snowfence and the x-axis running perpendicular to the snowfence at it's
southern end. The first coordinate was the distance in m from the y-axis
in an easterly direction, and the second coordinate was the distance in
m from the x-axis in a northly direction. Note that the 10, 25, and 45
meter rows are actually at roughly 15, 30, and 50 meters east of the
snowfence whereas the 75 meter row is actually at 75 m. east of the
snowfence. It is also important to note that the plots are not necessarily
in numerical order in each row, and that the x and y locations were only
approximately measured. NOTE: This EML metadata file does not contain important geospatial
data processing information. Before using any NWT LTER geospatial
data read the arcgis metadata XML file in either ISO or FGDC compliant
format, using ArcGIS software (ArcCatalog > description), or by
viewing the .xml file provided with the geospatial dataset.