KGA Editing Toolsផ្ទាំងអន្តរកម្ម
Split into COGO Lines
បំបែកព្រំដែនដែលបានជ្រើស ទៅជាបន្ទាត់មួយក្នុងមួយ course ដោយមានតម្លៃ COGO ដូច Modify Features ▸ Split into COGO Lines ក្នុង ArcGIS Pro។
- រកឃើញនៅឯណា
- Processing ▸ Toolbox ▸ KGA Toolbox ▸ KGA Editing Tools ▸ Split into COGO Lines
- លេខសម្គាល់ algorithm
- kga:split_into_cogo_lines
- ប្រភេទឧបករណ៍
- Interactive dialog — modeless, owns a map tool, needs the QGIS canvas
ទិដ្ឋភាពទូទៅ
Replica of the ArcGIS Pro Modify Features > Split into COGO Lines pane. Take a boundary — a parcel polygon, a right of way, a surveyed traverse — and break it into one line feature per course, each carrying the four COGO values a deed is written in: Direction, Distance, Radius and ArcLength.
The parts that decide whether the result matches the survey it came from:
- Arcs stay arcs. A File Geodatabase parcel boundary holds true circular arcs. Segmenting one into chords would lengthen the boundary and lose the curve entirely, so an arc comes through as a single COGO line whose radius and arc length describe it, with Direction and Distance giving the chord — which is what chord bearing and chord distance mean on a plat.
- The radius is signed. Positive turns clockwise from the start of the course, negative counter-clockwise. Reading a description back without the sign gives a mirror image of the curve.
- Directions say which convention they are in. A number with no convention beside it is not a direction.
- Bearings are grid bearings, measured in the projected CRS the lengths are measured in.
ប៉ារ៉ាម៉ែត្រ
The algorithm takes no Processing parameters — running it opens the pane. The controls below are the pane's.
| ផ្ទាំងគ្រប់គ្រង | ប្រភេទ | តម្លៃលំនាំដើម | ការពិពណ៌នា |
|---|---|---|---|
| Layer | Layer combo | the active layer | The lines or polygons to split. |
| Template | Line layer combo | — | The line layer the COGO lines are created in. A polygon boundary has to go somewhere else; a line layer can split into itself. |
| Direction type | Combo box | North azimuth | North azimuth, south azimuth, polar or quadrant bearing. North azimuth is clockwise from north; polar is counter-clockwise from east. |
| Direction units | Combo box | Degrees minutes seconds | Decimal degrees, degrees-minutes-seconds, gradians or radians. DMS is stored packed in a numeric field — 45°30'15" is the number 45.3015 — and written out in full (N45-30-15.00E) in a text field. |
| Distance units | Combo box | Meters | The unit Distance, Radius and ArcLength are written in. |
| Keep circular arcs as single courses | Checkbox | ticked | On, an arc is one COGO line with a radius and an arc length. Off, it is broken into straight chords, which lengthens the boundary. |
| Create the COGO fields if they are missing | Checkbox | ticked | Adds Direction, Distance, Radius and ArcLength to the template layer. Existing fields are matched by name, ignoring case and underscores, and left alone. |
| Copy the source attributes | Checkbox | ticked | Carries the boundary's values onto every course. |
| Delete the original feature | Checkbox | ticked | On — the ArcGIS default — the boundary is replaced by its courses. Off, the original is kept alongside them. |
| Split into COGO Lines | Toggle button | up | Puts the tool in hand. |
| Reset | Button | — | Sets the running count back to zero. |
| Close | Button | — | Closes the pane and gives the canvas back. |
របៀបប្រើ
- Open KGA Editing Tools > Split into COGO Lines. Close the Processing window once the pane appears.
- Pick the source Layer and the Template line layer.
- Set the direction convention — Direction type, Direction units — and the Distance units. Get these right before you start: a number with the wrong convention behind it is not recoverable by inspection.
- Decide whether the original boundary is replaced or kept.
- Press Split into COGO Lines, then hover a boundary to see the courses in cyan and click to write them. Drag across several to do them all.
លទ្ធផល
- One line feature per course in the template layer, with Direction, Distance, Radius and ArcLength filled in.
- The four COGO fields created on the template layer if they were missing.
- The original boundary deleted, unless Delete the original feature is unticked.
- Source attributes on every course when the box is ticked.
កំណត់សម្គាល់ និងដែនកំណត់
- A radius sign is meaningful. Positive is clockwise from the start of the course. A description read back without it describes the mirror image.
- A text Direction field gets the full form (
N45-30-15.00E); a numeric one gets the packed number (45.3015). Choose the field type deliberately. - Bearings are grid bearings, measured in the same projected CRS as the lengths — a layer stored in degrees is taken through its UTM zone rather than having angles read off a plate carrée.
- One press is one undo step per layer. The pane stays open while you work, and it owns the map tool.
- The tool cannot run headless or inside a model.