Segments, nodes, and junctions
I think we have most of the definitions for these terms under control in the Glossary, but I just noticed we are still a bit lacking on terms around nodes.
So I want to put here what I believe is the correct statements for these terms that we can discuss and debate. These are the current related Glossary entries. Words in "*" are hyperlinks to other terms or pages in the Wiki.
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Dead-end Node: This is a *Junction* found at the end of a road segment without another segment connected to its end.
Geometry: The layout or shape of a road *segment*. Each road is made up of straight line segments. These can be arbitrarily short, effectively allowing curves. For more information see *Editing existing roads*.
Geometry node: {2 segment images and 2 landmark images here}
When editing a segment or landmark, large white circles (previously large black squares) appear where the segment changes direction changing its shape. Click and drag them individually to alter the geometry of the segment or or landmark. Click and drag the small white circles on a segment to add them to an object or press the d key while the mouse is hovered over them to delete the geometry node.
The second segment and landmark image above are "inter"-geometry nodes. These are smaller and found halfway between two geometry nodes on a segment or landmark, or a segment geometry node and the end of a segment. When you click and drag an inter-geometry node, it becomes a larger geometry node and two more inter-geometry nodes appear halfway between each side again.
For more information see *Editing existing roads*.
Junction or Junction Point:
{Junction image} The point where two or more road segments connect or the end of a dead-end segment; often 'incorrectly' referred to as a 'node'.
Junctions look different depending on the situation:
{Images appear for each entry}
* Selected and editable segment junction
* Selected and uneditable segment junction (no permissions to change)
* Changed, unsaved junction
For more information see the *Junction Style Guide*.
Node: See *Geometry Node*.
Segment: Defines a section of roadway on which vehicles may travel or a pathway where only people may travel. Multiple segments are connected by *junctions*.
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1. What do we call the ends of a segment when the segment is highlighted? I thought they were "end nodes", but reading this sounds like only the points in the middle of a segment can be "nodes" and we call them "Geometry Nodes."
2. The answer to #1 will define if we call the end of a dead-end segment a "dead-end node" or not. Related to this question, do we really call it a "junction" when there are no other segments attached? I would say no. The current definition says a junction requires two or more segments. That would say a single segment cannot have a point that is a junction (unless it illegally wrapped upon itself). The Junction definition would also change to match this change.
3. I think the Geometry definition should change the sentence "Each road is made up of straight line segments." to "Each road is made up of one or more straight line sections." to prevent confusion with the already defined word for segment.
4. We often use the term "end node" but it is not defined. I propose we add it, but I am not sure if this is what you find at either end of a segment. I assume yes and a "dead-end node" is simply an "end node" that is not connected to another segment.
5. When we answer the above questions I can expand the definition of the term "Segment" here to include more information.
So I want to put here what I believe is the correct statements for these terms that we can discuss and debate. These are the current related Glossary entries. Words in "*" are hyperlinks to other terms or pages in the Wiki.
--------------------------------------------------
Dead-end Node: This is a *Junction* found at the end of a road segment without another segment connected to its end.
Geometry: The layout or shape of a road *segment*. Each road is made up of straight line segments. These can be arbitrarily short, effectively allowing curves. For more information see *Editing existing roads*.
Geometry node: {2 segment images and 2 landmark images here}
When editing a segment or landmark, large white circles (previously large black squares) appear where the segment changes direction changing its shape. Click and drag them individually to alter the geometry of the segment or or landmark. Click and drag the small white circles on a segment to add them to an object or press the d key while the mouse is hovered over them to delete the geometry node.
The second segment and landmark image above are "inter"-geometry nodes. These are smaller and found halfway between two geometry nodes on a segment or landmark, or a segment geometry node and the end of a segment. When you click and drag an inter-geometry node, it becomes a larger geometry node and two more inter-geometry nodes appear halfway between each side again.
For more information see *Editing existing roads*.
Junction or Junction Point:
{Junction image} The point where two or more road segments connect or the end of a dead-end segment; often 'incorrectly' referred to as a 'node'.
Junctions look different depending on the situation:
{Images appear for each entry}
* Selected and editable segment junction
* Selected and uneditable segment junction (no permissions to change)
* Changed, unsaved junction
For more information see the *Junction Style Guide*.
Node: See *Geometry Node*.
Segment: Defines a section of roadway on which vehicles may travel or a pathway where only people may travel. Multiple segments are connected by *junctions*.
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1. What do we call the ends of a segment when the segment is highlighted? I thought they were "end nodes", but reading this sounds like only the points in the middle of a segment can be "nodes" and we call them "Geometry Nodes."
2. The answer to #1 will define if we call the end of a dead-end segment a "dead-end node" or not. Related to this question, do we really call it a "junction" when there are no other segments attached? I would say no. The current definition says a junction requires two or more segments. That would say a single segment cannot have a point that is a junction (unless it illegally wrapped upon itself). The Junction definition would also change to match this change.
3. I think the Geometry definition should change the sentence "Each road is made up of straight line segments." to "Each road is made up of one or more straight line sections." to prevent confusion with the already defined word for segment.
4. We often use the term "end node" but it is not defined. I propose we add it, but I am not sure if this is what you find at either end of a segment. I assume yes and a "dead-end node" is simply an "end node" that is not connected to another segment.
5. When we answer the above questions I can expand the definition of the term "Segment" here to include more information.
Re: Segments, nodes, and junctions