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Automatic calculation of line orientations in QGIS

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.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;

2

2

I was able to see the types of cables ("* TYPE " in my data table) entered manually and the length of these cables (automatically calculated using the " Slength *" function with the name LONG in the field calculator). this whole info on the same label

("*TYPE||'n'||LONG||'m'*").

It is now impossible to make visible the orientation of the cables (Shape of line type) in gradians (between 0 and 400), with the origin reference in the Eastern direction.

qgis

share|improve this question

edited May 27 at 12:44

Mat

1,111617

asked May 27 at 10:24

Gil MirandaGil Miranda

133

New contributor

Gil Miranda is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

2

2

I was able to see the types of cables ("* TYPE " in my data table) entered manually and the length of these cables (automatically calculated using the " Slength *" function with the name LONG in the field calculator). this whole info on the same label

("*TYPE||'n'||LONG||'m'*").

It is now impossible to make visible the orientation of the cables (Shape of line type) in gradians (between 0 and 400), with the origin reference in the Eastern direction.

qgis

share|improve this question

edited May 27 at 12:44

Mat

1,111617

asked May 27 at 10:24

Gil MirandaGil Miranda

133

New contributor

Gil Miranda is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

I was able to see the types of cables ("* TYPE " in my data table) entered manually and the length of these cables (automatically calculated using the " Slength *" function with the name LONG in the field calculator). this whole info on the same label

("*TYPE||'n'||LONG||'m'*").

It is now impossible to make visible the orientation of the cables (Shape of line type) in gradians (between 0 and 400), with the origin reference in the Eastern direction.

qgis

share|improve this question

edited May 27 at 12:44

Mat

1,111617

asked May 27 at 10:24

Gil MirandaGil Miranda

133

New contributor

Gil Miranda is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

("*TYPE||'n'||LONG||'m'*").

share|improve this question

edited May 27 at 12:44

Mat

1,111617

asked May 27 at 10:24

Gil MirandaGil Miranda

133

New contributor

Gil Miranda is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

edited May 27 at 12:44

Mat

1,111617

asked May 27 at 10:24

Gil MirandaGil Miranda

133

New contributor

Gil Miranda is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

edited May 27 at 12:44

Mat

1,111617

edited May 27 at 12:44

Mat

1,111617

asked May 27 at 10:24

Gil MirandaGil Miranda

133

New contributor

Gil Miranda is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked May 27 at 10:24

Gil MirandaGil Miranda

133

1 Answer
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5

To get line angle you can use field calculator depending what exactly you need:
- line_interpolate_angle(geometry,distance)
- angle_at_vertex(geometry,vertex)

For more details check help in field calculator:

Result is in degrees (north origin), to convert it in grads you need to multiply by (400/360).
So field calculator expression would be something like: line_interpolate_angle($geometry,0) * (400 / 360).

Since you need angle originating from east you will need to add 90°: (line_interpolate_angle($geometry,0)+90 )* (400 / 360) and substract 400 for features that have value above 400g.

share|improve this answer

edited May 27 at 11:27

answered May 27 at 11:19

MatMat

1,111617

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I'll have to do some ajusts but it was really helpfull. Thx
  
  – Gil Miranda
  May 27 at 12:57
  

  
  
  
  

add a comment | 

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5

To get line angle you can use field calculator depending what exactly you need:
- line_interpolate_angle(geometry,distance)
- angle_at_vertex(geometry,vertex)

For more details check help in field calculator:

Result is in degrees (north origin), to convert it in grads you need to multiply by (400/360).
So field calculator expression would be something like: line_interpolate_angle($geometry,0) * (400 / 360).

Since you need angle originating from east you will need to add 90°: (line_interpolate_angle($geometry,0)+90 )* (400 / 360) and substract 400 for features that have value above 400g.

share|improve this answer

edited May 27 at 11:27

answered May 27 at 11:19

MatMat

1,111617

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I'll have to do some ajusts but it was really helpfull. Thx
  
  – Gil Miranda
  May 27 at 12:57
  

  
  
  
  

add a comment | 

5

To get line angle you can use field calculator depending what exactly you need:
- line_interpolate_angle(geometry,distance)
- angle_at_vertex(geometry,vertex)

For more details check help in field calculator:

Result is in degrees (north origin), to convert it in grads you need to multiply by (400/360).
So field calculator expression would be something like: line_interpolate_angle($geometry,0) * (400 / 360).

Since you need angle originating from east you will need to add 90°: (line_interpolate_angle($geometry,0)+90 )* (400 / 360) and substract 400 for features that have value above 400g.

share|improve this answer

edited May 27 at 11:27

answered May 27 at 11:19

MatMat

1,111617

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I'll have to do some ajusts but it was really helpfull. Thx
  
  – Gil Miranda
  May 27 at 12:57
  

  
  
  
  

add a comment | 

To get line angle you can use field calculator depending what exactly you need:
- line_interpolate_angle(geometry,distance)
- angle_at_vertex(geometry,vertex)

For more details check help in field calculator:

Result is in degrees (north origin), to convert it in grads you need to multiply by (400/360).
So field calculator expression would be something like: line_interpolate_angle($geometry,0) * (400 / 360).

Since you need angle originating from east you will need to add 90°: (line_interpolate_angle($geometry,0)+90 )* (400 / 360) and substract 400 for features that have value above 400g.

share|improve this answer

edited May 27 at 11:27

answered May 27 at 11:19

MatMat

1,111617

share|improve this answer

edited May 27 at 11:27

answered May 27 at 11:19

MatMat

1,111617

answered May 27 at 11:19

MatMat

1,111617

answered May 27 at 11:19

MatMat

1,111617