MarkLogic 10 Product Documentation
geo:remove-duplicate-vertices

geo:remove-duplicate-vertices(
   $region as cts:region,
   [$options as xs:string*]
) as cts:region

Summary

Remove duplicate (adjacent) vertices.

Parameters

region A cts region.

Parameters
region	A cts region.
options	The tolerance, units, coordinate system. Options include: "coordinate-system=value" Use the given coordinate system. Valid values are `wgs84`, `wgs84/double`, `etrs89`, `etrs89/double`, `raw` and `raw/double`. Defaults to the governing coordinating system. "precision=value" Use the coordinate system at the given precision. Allowed values: `float` and `double`. Defaults to the precision of the governing coordinate system. "units=value" Measure distance, radii of circles, and tolerance in the specified units. Allowed values: `miles` (default), `km`, `feet`, `meters`. "tolerance=distance" Tolerance is the largest allowable variation in geometry calculations. If the distance between two points is less than tolerance, then the two points are considered equal. For the raw coordinate system, use the units of the coordinates. For geographic coordinate systems, use the units specified by the units option.

options

The tolerance, units, coordinate system.

Options include:

"coordinate-system=value"

Use the given coordinate system. Valid values are wgs84, wgs84/double, etrs89, etrs89/double, raw and raw/double. Defaults to the governing coordinating system.

"precision=value"

Use the coordinate system at the given precision. Allowed values: float and double. Defaults to the precision of the governing coordinate system.

"units=value"

Measure distance, radii of circles, and tolerance in the specified units. Allowed values: miles (default), km, feet, meters.

"tolerance=distance"

Tolerance is the largest allowable variation in geometry calculations. If the distance between two points is less than tolerance, then the two points are considered equal. For the raw coordinate system, use the units of the coordinates. For geographic coordinate systems, use the units specified by the units option.

Usage Notes

Whether a vertex counts as a duplicate depends on the governing coordinate system and whether it is single or double precision unless tolerance is specified.

If the region parameter is a box, circle, or point, no action is taken and the region is returned unchanged.

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.

Example

geo:remove-duplicate-vertices(
  cts:polygon((
    cts:point(40.1234567890,-120.1234567890),
    cts:point(40.123456543,-120.123456543),
    cts:point(40.12455,-120.123467),
    cts:point(40.13456,-120.1455195))))

=> A cts:region with the following coordinates:
   40.123457,-120.12346 40.12455,-120.12347 40.13456,-120.14552
   40.123457,-120.12346"

MarkLogic 10 Product Documentationgeo:remove-duplicate-vertices

Summary

Usage Notes

See Also

Example

MarkLogic 10 Product Documentation
geo:remove-duplicate-vertices