Cadastralឧបករណ៍ដំណើរការ

Using parallel method (Trim Parcel by Road)

កាត់ព្រំដែនក្បាលដីថយមកត្រឹមគែមច្រករបៀងផ្លូវ ដែលបានមកពីខ្សែកណ្តាលផ្លូវ ដោយសាងគែមច្រករបៀងជាបន្ទាត់ស្របពិតប្រាកដ ជាមួយជ្រុងបែប mitre ឬ bevel។

រកឃើញនៅឯណា: KGA Toolbox ▸ Geoprocessing ▸ Trim Parcels ▸ Using parallel method

ទិដ្ឋភាពទូទៅ

Parcels digitised from imagery routinely overlap the road reserve. This tool removes the overlap so parcels meet the road edge precisely.

This is the parallel-offset method. The corridor edge is built by offsetting the centreline, which produces clean, correctly mitred corners at road junctions. Compare with Using buffer method, which buffers the centreline instead — simpler, but rounded or clipped at junctions.
Road Width Type decides where the corridor width comes from:
- Constant Width (default) — one width for the whole network, from Constant Road Width (Total Width).
- Width Field — a per-road width read from Road Width Field (Total Width).
Both width parameters take the total road width, not the half-width. The tool offsets by half the stated value on each side. (Note that the buffer-method tool takes a half width — the two are not interchangeable.)
Corner Style controls junction geometry:
- Miter (default) — offsets are extended to meet at a sharp point. Correct for most junctions, but produces a long spike at very acute angles.
- Bevel — the corner is cut off at the distance given in Bevel Distance from corner (default 5 Meters), which is the safer choice where roads meet at sharp angles.
Trim the input land parcel? decides whether the parcel layer is modified in place or a new trimmed layer is written to Output Trimmed Parcels. Trimming in place overwrites the original geometry — work on a copy until the result has been checked.
Additional Properties holds three fine-tuning parameters:

Parameter	Default	Purpose
Snap Tolerance	`0.01 Meters`	How close geometry must be to snap together
Extend Distance	`1 Meters`	How far corridor edges are extended to close junctions
Sliver Area Threshold	`1`	Offcuts smaller than this are discarded rather than left as slivers

Two optional outputs record the corridor itself: Output Road Edge (the edge lines) and Output Road Polygon (the corridor area). Append road edge to road centreline? adds the generated edges back into the road layer.

Parameters for Using parallel method (Trim Parcel by Road) — Input
ឈ្មោះ	ប្រភេទទិន្នន័យ	ការពិពណ៌នា
Trim the input land parcel?ជម្រើស	Boolean	Modifies the input parcel layer in place instead of writing a new one. Checked — The input geometry is trimmed in place. Unchecked — The result is written to Output Trimmed Parcels.
Input Parcel Layer	Feature Layer	The parcel layer to trim. Polygon geometry only.
Input Road Centerline Layer	Feature Set	The road centreline the corridor is offset from. Polyline geometry only.
Road Width Type	String	Where the corridor width comes from. Default is `Constant Width`. `Constant Width` `Width Field`
Constant Road Width (Total Width)ជម្រើស	Linear Unit	The total road width, applied to the whole network. Default is `0 Meters`. Used with `Constant Width`.
Road Width Field (Total Width)ជម្រើស	Field	The field holding each road's total width. Used with `Width Field`. Long, short, float, or double.
Corner Style	String	Junction corner geometry. Default is `Miter`. `Miter` — offsets meet at a point `Bevel` — the corner is cut off
Bevel Distance from cornerជម្រើស	Linear Unit	How far back the corner is cut when Corner Style is `Bevel`. Default is `5 Meters`.

Parameters for Using parallel method (Trim Parcel by Road) — Additional Properties
ឈ្មោះ	ប្រភេទទិន្នន័យ	ការពិពណ៌នា
Snap Tolerance	Linear Unit	The distance within which geometry is snapped together. Default is `0.01 Meters`.
Extend Distance	Linear Unit	How far corridor edges are extended to close junctions. Default is `1 Meters`.
Sliver Area Thresholdជម្រើស	Double	Offcuts smaller than this area are discarded instead of being left as slivers. Default is `1`.

Parameters for Using parallel method (Trim Parcel by Road) — Output
ឈ្មោះ	ប្រភេទទិន្នន័យ	ការពិពណ៌នា
Append road edge to road centreline?ជម្រើស	Boolean	Appends the generated road edge lines into the input road layer.
Output Road Edgeជម្រើស	Feature Class	The generated corridor edge lines.
Output Road Polygonជម្រើស	Feature Class	The corridor area as a polygon. Listed under Optional Outputs on the dialog.
Output Trimmed Parcelsជម្រើស	Feature Class	The trimmed parcel feature class. Required when Trim the input land parcel? is unchecked.

Make a copy of the parcel layer if you intend to trim in place.
On the KGA Toolbox tab, in the Geoprocessing group, open the Trim Parcels gallery and click Using parallel method.
Set Input Parcel Layer and Input Road Centerline Layer.
Set Road Width Type:
- For a uniform road width, keep Constant Width and enter the total width in Constant Road Width (Total Width).
- For varying widths, choose Width Field and set Road Width Field (Total Width).
Set Corner Style. Use Bevel with a suitable Bevel Distance from corner if roads meet at acute angles.
Leave Trim the input land parcel? unchecked and set Output Trimmed Parcels for a first run.
To keep the corridor geometry, set Output Road Edge and Output Road Polygon.
Click Run, then inspect the junctions for spikes or slivers. Adjust Corner Style, Extend Distance, or Sliver Area Threshold and run again if needed.

Requires an active KGA Toolbox license. The tool validates the license before running.