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25 March 2009 |
page update:
26 May 11
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V5.60 -- April 1997
Boundary Options for Extracting
with Regions
When you use a region to extract elements, there
are six options for how to treat the elements that cross the region boundary:
Partially inside, Completely Inside, Clip Inside, Partially Outside,
Completely Outside, and Clip Outside.
Database Tables for Clipped
Elements
New tables are created, and the unattached
records deleted when elements are extracted. Unattached records are the
records associated only with elements that do not survive extraction. New
standard attributes tables are also calculated so that elements clipped at the
region boundary have accurate attributes, such as area and length. New
standard attributes tables are calculated whether or not the object extracted
from had standard attributes tables.
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| A buffer zone region created around
selected tributaries was used to extract a portion of a soil map. The
position of the region relative to the soil map is shown in outline
above (left center). The extracted soil polygons are shown over the
vector object from which the lines to be buffered were selected (right
center). The soil class table and the standard attributes tables for
the complete and extracted soil maps are shown. The active polygon in
both objects was selected with a single mouse click. |
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