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Raster to Vector conversion can be achieved in
many ways. WiseImage software provides a method that can allows
a conversion that is usually much quicker than other digitization
methods. The following illustrates how park areas from a 1936
New Haven paper map can be extracted as a vector file. |
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After scanning the historic New
Haven paper map, it can be brought into WiseImage as a raster
-in this case as a .tif file. The park areas (the green areas
on the map) can be selected by using the color picker to select
the pixels that fall within a range of green color. |
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The pixels within
the range of green that represents New Haven parks can be picked
specifically from the raster by zooming in to different portions
of it. |
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A final raster is extracted based
on the selection of pixels as a separate layer. This contains
the raster pixels that represent the New Haven parks, leaving
out the rest of the features on the map. |
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Additional tools
in WiseImage allow the user to extract a more accurate raster
that represents the parks. These tools include, blur, unsharp
mask, median, speckle remover, hole remover, inversion, thinning,
and thickening. |
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Using countour coupling,
outlines can be extracted from the the solid raster areas representing
the parks. This final raster layer can then be converted to
a vector with the click of a button. WiseImage exports in a
CAD vector format (.dxf) which can be read by ArcView or converted
to a shapefile. |
