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Figure 1. Landsat
Thematic Mapper (TM) satellite data for a
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6x6-km
area in Westchester County, New York. Shown are
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the
raw data (a), as well as products (e.g., maps) derived from
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the
data (b-d) that might be used for modeling Lyme disease
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transmission
risk. a) Raw Landsat TM image composed of
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bands
5, 4, and 3 (mid-infrared, near-infrared, and red bands).
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Vegetation
is shown in shades of green, with bare soil and
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urban
areas shown in shades of pink and purple. The spatial
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resolution
of these data is 30x30 m. b) Map showing
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contiguous
forest patches, derived from a Landsat TM
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classification.
Colors represent discrete patches, with white
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indicating
the absence of contiguous forest. c) A 12-class land
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cover
map derived from the Landsat TM data. d) Composite
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image
of three spectral indices derived from the Landsat TM
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data,
showing the contributions of scene brightness in red,
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greenness in
green, and wetness in blue.
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