geo:circle-polygon( $circle as cts:circle, $arc-tolerance as xs:double, [$options as xs:string*] ) as cts:region
Construct a polygon approximating a circle.
When approximating the polygon, if the distance between two points is
less than tolerance
, then they are considered to be the
same point. The arc-tolerance
parameter specifies the
allowable error in the polygon approximation. That is, the resulting
polygon will differ from the provided circle by at most
arc-tolerance
.
The arc-tolerance
parameter value must be greater than
the tolerance, and both arc-tolerance
and tolerance
should be expressed in the same units. For example, if the units
option is set to "km" and you're using a geodetic coordinate system, then
arc-tolerance
and tolerance
(if specified) should
also be in kilometers. The default tolerance is 0.05km (or the equivalent in
other units). Use the tolerance
option to override the default.
The value of the precision
option takes precedence over
that implied by the governing coordinate system name, including the
value of the coordinate-system
option. For example, if the
governing coordinate system is "wgs84/double" and the precision
option is "float", then the operation uses single precision.
geo:circle-polygon(cts:circle(7,cts:point(10,20)),4, ("tolerance=1")); => A cts:region with the following coordinates: 10.10185,20 10.050913,20.088997 9.9490623,20.08897 9.8981495,20 9.9490623,19.91103 10.050913,19.911001 10.10185,20
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