Turns in the vector network analysis - Revision history

⚠️Turek at 23:46, 9 June 2020

2020-06-09T23:46:22Z

← Older revision		Revision as of 23:46, 9 June 2020
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	=== Specific parameters of modules working with turntable ===		=== Specific parameters of modules working with turntable ===

	* '''~~arclayer~~''' - Name or number of the arc layer that will be expanded by turntable.		* '''arc_layer''' - Name or number of the arc layer that will be expanded by turntable.

	* ''' turn_layer''' - Name or number of the layer to which the turntable will be attached.		* ''' turn_layer''' - Name or number of the layer to which the turntable will be attached.

⚠️Turek at 23:45, 9 June 2020

2020-06-09T23:45:16Z

← Older revision		Revision as of 23:45, 9 June 2020
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	=== Specific parameters of modules working with turntable ===		=== Specific parameters of modules working with turntable ===

	* '''~~alayer~~''' - Name or number of the arc layer that will be expanded by turntable.		* '''arclayer''' - Name or number of the arc layer that will be expanded by turntable.

	* '''~~tlayer~~''' - Name or number of the layer to which the turntable will be attached.		* ''' turn_layer''' - Name or number of the layer to which the turntable will be attached.

	* '''~~tuclayer~~''' - Name or number of the layer with unique categories for every line and point. The points are placed on every node.		* ''' turn_cat_layer''' - Name or number of the layer with unique categories for every line and point. The points are placed on every node.

	==WxGUI Vector Network Analysis Tool (not yet implemented)==		==WxGUI Vector Network Analysis Tool (not yet implemented)==

Neteler: remove hardcoded version specific urls, use latest version

2018-12-04T10:04:09Z

remove hardcoded version specific urls, use latest version

← Older revision		Revision as of 10:04, 4 December 2018
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	__TOC__		__TOC__

	The turntable ~~(available in GRASS >= 7.1)~~ can be created by {{cmd\|v.net~~\|version=71~~}} module, which is one of [[vector network analysis]] modules.		The turntable can be created by {{cmd\|v.net}} module, which is one of [[vector network analysis]] modules.
	Building the turntable allows you to model e.g. ~~trafic~~ code, where some turns may be prohibited.		Building the turntable allows you to model e.g. traffic code, where some turns may be prohibited.
	It creates a turntable with the costs for every possible turn on every possible node (intersection, crossroad) in given layer. U-turns are taken in account too.		It creates a turntable with the costs for every possible turn on every possible node (intersection, crossroad) in given layer. U-turns are taken in account too.

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	== Modules working with turntable ==		== Modules working with turntable ==

	* {{cmd\|v.net~~\|version=70~~}} - creates the turntable		* {{cmd\|v.net}} - creates the turntable
			* {{cmd\|v.net.path}}
			* {{cmd\|v.net.alloc}}
			* {{cmd\|v.net.iso}}
			* {{cmd\|v.net.salesman}}

	* {{cmd\|v.net.path\|version=70}}

	* {{cmd\|v.net.alloc\|version=70}}

	* {{cmd\|v.net.iso\|version=70}}

	* {{cmd\|v.net.salesman\|version=70}}
	=== Specific parameters of modules working with turntable ===		=== Specific parameters of modules working with turntable ===

⚠️Turek: info about grass version supporting turntable

2014-11-28T10:23:48Z

info about grass version supporting turntable

← Older revision		Revision as of 10:23, 28 November 2014
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	~~{{ToModify}}~~

	__TOC__		__TOC__

	The turntable can be created by {{cmd\|v.net\|version=70}} module, which is one of [[vector network analysis]] modules.		The turntable (available in GRASS >= 7.1) can be created by {{cmd\|v.net\|version=71}} module, which is one of [[vector network analysis]] modules.
	Building the turntable allows you to model e.g. trafic code, where some turns may be prohibited.		Building the turntable allows you to model e.g. trafic code, where some turns may be prohibited.
	It creates a turntable with the costs for every possible turn on every possible node (intersection, crossroad) in given layer. U-turns are taken in account too.		It creates a turntable with the costs for every possible turn on every possible node (intersection, crossroad) in given layer. U-turns are taken in account too.

⚠️Turek: turntable gui not implemented

2014-11-28T10:20:58Z

turntable gui not implemented

← Older revision		Revision as of 10:20, 28 November 2014
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	* '''tuclayer''' - Name or number of the layer with unique categories for every line and point. The points are placed on every node.		* '''tuclayer''' - Name or number of the layer with unique categories for every line and point. The points are placed on every node.

	==WxGUI Vector Network Analysis Tool==		==WxGUI Vector Network Analysis Tool (not yet implemented)==

	In GUI for v.net modules there is the checkbox option to “use turns”. If checked, it is required to fill these additional parameters: tlayer (layer with turntable), tuclayer (layer with unique categories for turntable). The dialog is shown below.		In GUI for v.net modules there is the checkbox option to “use turns”. If checked, it is required to fill these additional parameters: tlayer (layer with turntable), tuclayer (layer with unique categories for turntable). The dialog is shown below.

⚠️Turek: modules supporting turntable

2014-03-26T17:40:44Z

modules supporting turntable

← Older revision		Revision as of 17:40, 26 March 2014
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	In the angle column for this record the value is -1.373597 radians which is roughly -80°. This perfectly makes sense since left turns have negative values and right turns have positive. The angle is measured as deviance from straight direction (which is 0°).		In the angle column for this record the value is -1.373597 radians which is roughly -80°. This perfectly makes sense since left turns have negative values and right turns have positive. The angle is measured as deviance from straight direction (which is 0°).

	== Specific parameters ==		== Modules working with turntable ==

			* {{cmd\|v.net\|version=70}} - creates the turntable

			* {{cmd\|v.net.path\|version=70}}

			* {{cmd\|v.net.alloc\|version=70}}

			* {{cmd\|v.net.iso\|version=70}}

			* {{cmd\|v.net.salesman\|version=70}}
			=== Specific parameters of modules working with turntable ===

	* '''alayer''' - Name or number of the arc layer that will be expanded by turntable.		* '''alayer''' - Name or number of the arc layer that will be expanded by turntable.
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	* '''tuclayer''' - Name or number of the layer with unique categories for every line and point. The points are placed on every node.		* '''tuclayer''' - Name or number of the layer with unique categories for every line and point. The points are placed on every node.


	==WxGUI Vector Network Analysis Tool==		==WxGUI Vector Network Analysis Tool==

⚠️Turek at 14:41, 10 March 2014

2014-03-10T14:41:09Z

← Older revision		Revision as of 14:41, 10 March 2014
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	For better handling, a linegraph is created. In this linegraph, every line is represented by two nodes. These nodes have positive and negative values respectively, with their absolute values identical. Every node corresponds to opposite line direction. The positive node matches the direction of line. The negative node matches the opposite direction. For better understanding, let's have a travelling subject standing on a line (road) before an intersection wanting to cross it. This line's direction is TOWARDS the intersection. Travelling from this line through the intersection means that the subject is currently standing on the POSITIVE node representation of the line. After crossing to this line from any permitted direction, the subject gets to the NEGATIVE point representation of the line.		For better handling, a linegraph is created. In this linegraph, every line is represented by two nodes. These nodes have positive and negative values respectively, with their absolute values identical. Every node corresponds to opposite line direction. The positive node matches the direction of line. The negative node matches the opposite direction. For better understanding, let's have a travelling subject standing on a line (road) before an intersection wanting to cross it. This line's direction is TOWARDS the intersection. Travelling from this line through the intersection means that the subject is currently standing on the POSITIVE node representation of the line. After crossing to this line from any permitted direction, the subject gets to the NEGATIVE point representation of the line.

	These two nodes (corresponding to the same line) are connected with two U-turns (for both directions). Every U-turn direction belongs to another intersection. U-turn from the POSITIVE node to the NEGATIVE one belongs to the intersection we are going to cross. The other U-turn belongs to the intersection at the opposite end of this line.		These two nodes (corresponding to the same line) are connected with two U-turns (for both directions). Every U-turn direction belongs to another intersection. U-turn from the POSITIVE node to the NEGATIVE one belongs to the intersection we are going to cross. The other U-turn belongs to the intersection at the opposite end of this line.

			'''If features in analyzed network are changed, the turntable must be created again (e.g. it includes v.net connect operation). '''

	==Turntable description==		==Turntable description==
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	* '''tuclayer''' - Name or number of the layer with unique categories for every line and point. The points are placed on every node.		* '''tuclayer''' - Name or number of the layer with unique categories for every line and point. The points are placed on every node.


	==WxGUI Vector Network Analysis Tool==		==WxGUI Vector Network Analysis Tool==

⚠️Turek: /* Turntable description */

2014-03-10T14:36:45Z

Turntable description

← Older revision		Revision as of 14:36, 10 March 2014
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	'''Columns description:'''		'''Columns description:'''

	* '''cat''' – category in tlayer (layer with turntable), which corresponds to both lines in turn		* '''cat''' – category in '''tlayer''' (layer with turntable), which corresponds to both lines in turn

	* '''ln_from''' – unique category in ~~tucats~~ layer assigned to the starting line of the turn		* '''ln_from''' – unique category in '''tuclayer''' layer assigned to the starting line of the turn

	* '''ln_to''' – unique category in ~~tucats~~ layer assigned to the ending line line of the turn		* '''ln_to''' – unique category in '''tuclayer''' layer assigned to the ending line line of the turn

	* '''cost''' – cost for turn (integer or double)		* '''cost''' – cost for turn (integer or double), assign -1 to close the turn

	* '''isec''' – point category in ~~tucats~~ layer, which represents the intersection, where the turn belongs		* '''isec''' – point category in '''tulayer''' layer, which represents the intersection, where the turn belongs

	* '''angle''' – angle between the lines before and after the intersection (radians), positive -> turn to the right, negative -> turn to the left, 0 -> straight		* '''angle''' – angle between the lines before and after the intersection (radians), positive -> turn to the right, negative -> turn to the left, 0 -> straight

⚠️Turek: /* Turntable description (the table itself) */

2014-03-10T14:29:33Z

Turntable description (the table itself)

← Older revision		Revision as of 14:29, 10 March 2014
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	==Turntable description ~~(the table itself)~~==		==Turntable description==

	Every record in the turntable represents one turn.		Every record in the turntable represents one turn.

⚠️Turek at 14:28, 10 March 2014

2014-03-10T14:28:10Z

← Older revision		Revision as of 14:28, 10 March 2014
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	The turntable can be created by {{cmd\|v.net\|version=70}} module, which is one of [[vector network analysis]] modules.		The turntable can be created by {{cmd\|v.net\|version=70}} module, which is one of [[vector network analysis]] modules.
			Building the turntable allows you to model e.g. trafic code, where some turns may be prohibited.
	It creates a turntable with the costs for every possible turn on every possible node (intersection, crossroad) in given layer. U-turns are taken in account too.		It creates a turntable with the costs for every possible turn on every possible node (intersection, crossroad) in given layer. U-turns are taken in account too.