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occurrence of those species within a particular
area. Traditionally, the predicted occurrences of
most species begin with samples from collections
made at individual point locations. Most traditional species
range maps are small-scale (e.g., >1:10,000,000)
and derived primarily from point data to construct
field guides.
to provide more precise information about the
current predicted distribution of individual
native species within their general ranges.
Unit
report
traced back to the source data to detect any
errors in the used GIS models. No invalid values
were found. Results evaluatin still in the testing
stage.
county-level. Butterfly distributions were determined
from county dot maps provided by P. Opler and other
publications. All resulting county-level maps for each
species were reviewed by experts of the respective faunas.
County-level distribution was converted to a
species by county matrix for use as a filter in
ARC/INFO prior to incorporation of habitat
information. Counties were attributed as either
"0", "1". A value of 0 corresponded to an absence
of the species in question in that particular
county. Values of 1 corresponds to presence.
Animal distribution data for the state of Florida
was almost exclusively at the level of counties.
Thus, our original distributions for the taxa
included in the Florida Gap Analysis were made at
the county-level. These distributions were then
joined with the coverage of EMAP hexagons to
provide a distribution coverage that was based on
EMAP hexagons. This was done so that the Florida
distribution coverage was compatible with animal
coverages generated by other adjacent states.
That process extended some animal distributions
partly into counties where they have not been
recorded. However, these extensions were minimal,
and the final maps for individual species were
based upon suitable habitat being available within
a given hexagon.
The final maps for individual species were based upon suitable habitat
being available within a given hexagon. Agriculture and urban areas
were not considered when modeling butterfly distributions. Refer to the
"predicted Animal Species Distributions and Species
Richness" Chapter in the GAP report for more details.