Stroke Tolerance
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Specifies the maximum allowable separation between
the chord representing a line string approximation of a curved element and the
exact curve. The units are master units of the active model. The smaller the
number, the finer the approximation and the slower the algorithm. Stroke
Tolerance is used for all stroke options.
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Reproject Cell components individually
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Determines if cell components should be reprojected
individually. Always reprojects every element in every cell. Never treats all
elements as single entities. The default, If Spatially Large, reprojects every
component of cells that occupies more than an area of .2 square kilometers in
the X-Y plane, and treats smaller cells as single entities.
Reprojecting each component element individually is
best for cells representing a man made unit, such as a transformer box or
parking lot light. Calculating the best linear transform at the cell origin and
then applying transform to all components, treating the cell as a single
entity, is best for geographic features that have been grouped as a cell for
convenience.
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Reproject Multiline Text components individually
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Determines if multiline text components (text
nodes) should be reprojected individually. Always reprojects every text element
in multiline text. Never treats all text elements as single entities. The
default, If Spatially Large, reprojects every text component of multiline text
that occupies more than an area of .2 square kilometers in the X-Y plane, and
treats smaller cells as single entities.
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Rotate Cells
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Rotates cells by the geographic coordinate system
convergence angle calculated at the cell origin. Yes is the default setting.
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Scale Cells
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Scales cells by the geographic coordinate system
scale factor calculated at the cell origin. Yes is the default setting.
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Rotate Text Elements
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Rotates text elements by the geographic coordinate
system convergence angle calculated at the cell origin. Yes is the default
setting.
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Scale Text Elements
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Scales text elements by the geographic coordinate
system scale factor calculated at the cell origin. Yes is the default setting.
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Stroke Arcs to Line Strings
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Strokes an arc to a line string approximation (the
accuracy of the approximation depends on the Stroke Tolerance setting) and then
reprojects points in the line string; the arc loses its identity as an arc. In
many reprojections, the path of an arc does not remain an arc. This setting can
be set to Always, Never, and, the default, If Spatially Large.
If an arc is not stroked, the best fit reprojected
arc is calculated.
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Stroke Ellipses to Line Strings
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Strokes an ellipse to a line string approximation
(the accuracy of the approximation depends on the Stroke Tolerance setting) and
then reprojects points in the line string; the ellipse loses its identity as an
ellipse. In many reprojections, the path of an ellipse does not remain an
ellipse. This setting can be set to Always, Never, and, the default, If
Spatially Large.
If an ellipse is not stroked, the best fit
reprojected ellipse is calculated.
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Stroke Curves to Line Strings
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Strokes an Akima curve element (element type11) to
a line string approximation (the accuracy of the approximation depends on the
Stroke Tolerance setting) and then reprojects points in the line string; the
Akima curve element loses its identity as an Akima curve element. In many
reprojections, the path of an Akima curve element does not remain an Akima
curve element. This setting can be set to Always, Never, and, the default, If
Spatially Large.
If an Akima curve element is not stroked, the best
fit reprojected Akima curve element is calculated.
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Reproject Elevations
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If on, and the
coordinate system is 3D,
OpenTunnel Designer corrects the Z values of coordinates when the datum or
geoid elevation of the source and destination Geographic Coordinate Systems are
different. If off, the Z values are unchanged. The default is to leave Z values
unchanged.
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Add Points If Needed
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Inserts points along a line so that it stays along
the correct path within the Stroke Tolerance setting. This improves quality but
requires more processor time and controls situations where a line segment
appears straight in one projection but appears curved in another. For example,
lines of constant latitude in an Equidistant Cylindrical projection are
straight horizontal lines, but in a Lambert Conformal Conic projection they are
arcs of varying radius. If a particular boundary drawn exactly along a parallel
is represented by a long line in a design using an Equidistance Cylindrical
projection, the end points are reprojected but it still appears as a straight
line when reprojected to a Lambert Conformal Conic projection.
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