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Relative position of nodes
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I am studying bird movements and have tracked their locations, ie from flower 1 to flower 2 to flower 3 etc. Each point is mapped out. I am trying to work out the relative direction for each movement of the bird. in the picture below the angles are A1 and A2. so A1 is the relative direction of the bird travelling from N2 to N3 based on the original direction of N1 to N2. I have over 1000 movements which are copletely random with up to 50 flowers per map. is there a way to run the movements with the outcome relative angle?
At this point the bird movements are stored in a spreadsheet. I am unsure of how to incorporate them for this purpose.
P.S. im relatively new to gis so knowledge is limited
qgis direction angles wildlife-ecology
edited Feb 15 '17 at 4:45
Aaron♦
38.3k20110256
asked Feb 12 '17 at 2:05
Jay EdwardsJay Edwards
243
bumped to the homepage by Community♦ 1 min ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
add a comment |
I am studying bird movements and have tracked their locations, ie from flower 1 to flower 2 to flower 3 etc. Each point is mapped out. I am trying to work out the relative direction for each movement of the bird. in the picture below the angles are A1 and A2. so A1 is the relative direction of the bird travelling from N2 to N3 based on the original direction of N1 to N2. I have over 1000 movements which are copletely random with up to 50 flowers per map. is there a way to run the movements with the outcome relative angle?
At this point the bird movements are stored in a spreadsheet. I am unsure of how to incorporate them for this purpose.
P.S. im relatively new to gis so knowledge is limited
qgis direction angles wildlife-ecology
edited Feb 15 '17 at 4:45
Aaron♦
38.3k20110256
asked Feb 12 '17 at 2:05
Jay EdwardsJay Edwards
243
bumped to the homepage by Community♦ 1 min ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
3
Probably you need to add more details to your request. I don't understand which kind of data do you have as a start and how you manage them when a new position is reached. I mean, do you refresh a point layer by adding a new field storing a new position (coordinates?) every time an animal moves off from the previous position? And then, which is the result expected? A point with new fields, a line containing all the positions, or something else?
– mgri
Feb 12 '17 at 9:51
1
Could you please update your question with an example of your desired output?
– Aaron♦
Feb 15 '17 at 4:46
add a comment |
I am studying bird movements and have tracked their locations, ie from flower 1 to flower 2 to flower 3 etc. Each point is mapped out. I am trying to work out the relative direction for each movement of the bird. in the picture below the angles are A1 and A2. so A1 is the relative direction of the bird travelling from N2 to N3 based on the original direction of N1 to N2. I have over 1000 movements which are copletely random with up to 50 flowers per map. is there a way to run the movements with the outcome relative angle?
At this point the bird movements are stored in a spreadsheet. I am unsure of how to incorporate them for this purpose.
P.S. im relatively new to gis so knowledge is limited
qgis direction angles wildlife-ecology
edited Feb 15 '17 at 4:45
Aaron♦
38.3k20110256
asked Feb 12 '17 at 2:05
Jay EdwardsJay Edwards
243
I am studying bird movements and have tracked their locations, ie from flower 1 to flower 2 to flower 3 etc. Each point is mapped out. I am trying to work out the relative direction for each movement of the bird. in the picture below the angles are A1 and A2. so A1 is the relative direction of the bird travelling from N2 to N3 based on the original direction of N1 to N2. I have over 1000 movements which are copletely random with up to 50 flowers per map. is there a way to run the movements with the outcome relative angle?
At this point the bird movements are stored in a spreadsheet. I am unsure of how to incorporate them for this purpose.
P.S. im relatively new to gis so knowledge is limited
qgis direction angles wildlife-ecology
qgis direction angles wildlife-ecology
edited Feb 15 '17 at 4:45
Aaron♦
38.3k20110256
asked Feb 12 '17 at 2:05
Jay EdwardsJay Edwards
243
edited Feb 15 '17 at 4:45
Aaron♦
38.3k20110256
asked Feb 12 '17 at 2:05
Jay EdwardsJay Edwards
243
edited Feb 15 '17 at 4:45
Aaron♦
38.3k20110256
edited Feb 15 '17 at 4:45
Aaron♦
38.3k20110256
edited Feb 15 '17 at 4:45
Aaron♦
38.3k20110256
38.3k20110256
asked Feb 12 '17 at 2:05
Jay EdwardsJay Edwards
243
asked Feb 12 '17 at 2:05
Jay EdwardsJay Edwards
243
asked Feb 12 '17 at 2:05
Jay EdwardsJay Edwards
243
243
bumped to the homepage by Community♦ 1 min ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
bumped to the homepage by Community♦ 1 min ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
3
Probably you need to add more details to your request. I don't understand which kind of data do you have as a start and how you manage them when a new position is reached. I mean, do you refresh a point layer by adding a new field storing a new position (coordinates?) every time an animal moves off from the previous position? And then, which is the result expected? A point with new fields, a line containing all the positions, or something else?
– mgri
Feb 12 '17 at 9:51
1
Could you please update your question with an example of your desired output?
– Aaron♦
Feb 15 '17 at 4:46
add a comment |
3
Probably you need to add more details to your request. I don't understand which kind of data do you have as a start and how you manage them when a new position is reached. I mean, do you refresh a point layer by adding a new field storing a new position (coordinates?) every time an animal moves off from the previous position? And then, which is the result expected? A point with new fields, a line containing all the positions, or something else?
– mgri
Feb 12 '17 at 9:51
1
Could you please update your question with an example of your desired output?
– Aaron♦
Feb 15 '17 at 4:46
3
3
Probably you need to add more details to your request. I don't understand which kind of data do you have as a start and how you manage them when a new position is reached. I mean, do you refresh a point layer by adding a new field storing a new position (coordinates?) every time an animal moves off from the previous position? And then, which is the result expected? A point with new fields, a line containing all the positions, or something else?
– mgri
Feb 12 '17 at 9:51
Probably you need to add more details to your request. I don't understand which kind of data do you have as a start and how you manage them when a new position is reached. I mean, do you refresh a point layer by adding a new field storing a new position (coordinates?) every time an animal moves off from the previous position? And then, which is the result expected? A point with new fields, a line containing all the positions, or something else?
– mgri
Feb 12 '17 at 9:51
1
1
Could you please update your question with an example of your desired output?
– Aaron♦
Feb 15 '17 at 4:46
Could you please update your question with an example of your desired output?
– Aaron♦
Feb 15 '17 at 4:46
add a comment |
1 Answer
1
active
oldest
votes
This is relatively easy if you store the data as a Point layer in sequential order.
- Assume your layer name is
bird_move
- Create a new field
azimuthwhich represents the azimuth between points. - Create a new field
angle(difference between consecutiveazimuthvalues).
Start the Field Calculator and give expressions as below:
azimuth
degrees(azimuth(geometry(get_feature_by_id('bird_move', $id-1)), $geometry))
angle
abs("azimuth"- attribute(get_feature_by_id('bird_move', $id+1), 'azimuth') )
Then you will obtain:
answered Oct 25 '18 at 15:35
KazuhitoKazuhito
16.2k41884
add a comment |
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1 Answer
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This is relatively easy if you store the data as a Point layer in sequential order.
- Assume your layer name is
bird_move
- Create a new field
azimuthwhich represents the azimuth between points. - Create a new field
angle(difference between consecutiveazimuthvalues).
Start the Field Calculator and give expressions as below:
azimuth
degrees(azimuth(geometry(get_feature_by_id('bird_move', $id-1)), $geometry))
angle
abs("azimuth"- attribute(get_feature_by_id('bird_move', $id+1), 'azimuth') )
Then you will obtain:
answered Oct 25 '18 at 15:35
KazuhitoKazuhito
16.2k41884
add a comment |
This is relatively easy if you store the data as a Point layer in sequential order.
- Assume your layer name is
bird_move
- Create a new field
azimuthwhich represents the azimuth between points. - Create a new field
angle(difference between consecutiveazimuthvalues).
Start the Field Calculator and give expressions as below:
azimuth
degrees(azimuth(geometry(get_feature_by_id('bird_move', $id-1)), $geometry))
angle
abs("azimuth"- attribute(get_feature_by_id('bird_move', $id+1), 'azimuth') )
Then you will obtain:
answered Oct 25 '18 at 15:35
KazuhitoKazuhito
16.2k41884
add a comment |
This is relatively easy if you store the data as a Point layer in sequential order.
- Assume your layer name is
bird_move
- Create a new field
azimuthwhich represents the azimuth between points. - Create a new field
angle(difference between consecutiveazimuthvalues).
Start the Field Calculator and give expressions as below:
azimuth
degrees(azimuth(geometry(get_feature_by_id('bird_move', $id-1)), $geometry))
angle
abs("azimuth"- attribute(get_feature_by_id('bird_move', $id+1), 'azimuth') )
Then you will obtain:
answered Oct 25 '18 at 15:35
KazuhitoKazuhito
16.2k41884
This is relatively easy if you store the data as a Point layer in sequential order.
- Assume your layer name is
bird_move
- Create a new field
azimuthwhich represents the azimuth between points. - Create a new field
angle(difference between consecutiveazimuthvalues).
Start the Field Calculator and give expressions as below:
azimuth
degrees(azimuth(geometry(get_feature_by_id('bird_move', $id-1)), $geometry))
angle
abs("azimuth"- attribute(get_feature_by_id('bird_move', $id+1), 'azimuth') )
Then you will obtain:
answered Oct 25 '18 at 15:35
KazuhitoKazuhito
16.2k41884
answered Oct 25 '18 at 15:35
KazuhitoKazuhito
16.2k41884
answered Oct 25 '18 at 15:35
KazuhitoKazuhito
16.2k41884
answered Oct 25 '18 at 15:35
KazuhitoKazuhito
16.2k41884
16.2k41884
add a comment |
add a comment |
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3
Probably you need to add more details to your request. I don't understand which kind of data do you have as a start and how you manage them when a new position is reached. I mean, do you refresh a point layer by adding a new field storing a new position (coordinates?) every time an animal moves off from the previous position? And then, which is the result expected? A point with new fields, a line containing all the positions, or something else?
– mgri
Feb 12 '17 at 9:51
1
Could you please update your question with an example of your desired output?
– Aaron♦
Feb 15 '17 at 4:46