Finding widest portion of river bank using ArcGIS Desktop?
I am having a long portion of river. Here I am displaying part of it. In this polygon which is transparent black.
How do I find the wider track (from left bank to right bank) using ArcGIS Desktop ?
arcgis-desktop arcmap
|
show 1 more comment
I am having a long portion of river. Here I am displaying part of it. In this polygon which is transparent black.
How do I find the wider track (from left bank to right bank) using ArcGIS Desktop ?
arcgis-desktop arcmap
5
How do you mesure that ? is it the longest segment perpendicular to the river centerline (and you need to define what you consider river centerline : line of max depth or centerline of your polygone or ...) you need to give more detail and say what you have already tried if you want answer
– J.R
15 hours ago
I have updated the question, It is bank to bank I require.
– Gokul Anand
15 hours ago
4
But how do you define 'bank to bank'? You could draw a very long line from the bank near the lower left side to the upper right side, for example.
– Simbamangu
14 hours ago
2
I totaly agree with them. Question is not clear as bank to bank could be a huge line from left nord bank side to right south bank side. Otherwise you should decide first what is the center line of the river and then you can compute the longest perpendicular line all along the river.
– César Arquero
14 hours ago
I recently found out about Fréchet distances. Let's say you walk along one bank and your dog - on a leash - walks down the other. Walking at the same speed and direction, what's the longest leash you would need? That would give you at least one measure of the widest point. Having said that, I've no idea how you'd find that in ArcGIS (at least not without doing some Python coding). But at least it's a starting point.
– Mark Ireland
11 hours ago
|
show 1 more comment
I am having a long portion of river. Here I am displaying part of it. In this polygon which is transparent black.
How do I find the wider track (from left bank to right bank) using ArcGIS Desktop ?
arcgis-desktop arcmap
I am having a long portion of river. Here I am displaying part of it. In this polygon which is transparent black.
How do I find the wider track (from left bank to right bank) using ArcGIS Desktop ?
arcgis-desktop arcmap
arcgis-desktop arcmap
edited 11 hours ago
PolyGeo♦
53.4k1780239
53.4k1780239
asked 15 hours ago
Gokul AnandGokul Anand
297
297
5
How do you mesure that ? is it the longest segment perpendicular to the river centerline (and you need to define what you consider river centerline : line of max depth or centerline of your polygone or ...) you need to give more detail and say what you have already tried if you want answer
– J.R
15 hours ago
I have updated the question, It is bank to bank I require.
– Gokul Anand
15 hours ago
4
But how do you define 'bank to bank'? You could draw a very long line from the bank near the lower left side to the upper right side, for example.
– Simbamangu
14 hours ago
2
I totaly agree with them. Question is not clear as bank to bank could be a huge line from left nord bank side to right south bank side. Otherwise you should decide first what is the center line of the river and then you can compute the longest perpendicular line all along the river.
– César Arquero
14 hours ago
I recently found out about Fréchet distances. Let's say you walk along one bank and your dog - on a leash - walks down the other. Walking at the same speed and direction, what's the longest leash you would need? That would give you at least one measure of the widest point. Having said that, I've no idea how you'd find that in ArcGIS (at least not without doing some Python coding). But at least it's a starting point.
– Mark Ireland
11 hours ago
|
show 1 more comment
5
How do you mesure that ? is it the longest segment perpendicular to the river centerline (and you need to define what you consider river centerline : line of max depth or centerline of your polygone or ...) you need to give more detail and say what you have already tried if you want answer
– J.R
15 hours ago
I have updated the question, It is bank to bank I require.
– Gokul Anand
15 hours ago
4
But how do you define 'bank to bank'? You could draw a very long line from the bank near the lower left side to the upper right side, for example.
– Simbamangu
14 hours ago
2
I totaly agree with them. Question is not clear as bank to bank could be a huge line from left nord bank side to right south bank side. Otherwise you should decide first what is the center line of the river and then you can compute the longest perpendicular line all along the river.
– César Arquero
14 hours ago
I recently found out about Fréchet distances. Let's say you walk along one bank and your dog - on a leash - walks down the other. Walking at the same speed and direction, what's the longest leash you would need? That would give you at least one measure of the widest point. Having said that, I've no idea how you'd find that in ArcGIS (at least not without doing some Python coding). But at least it's a starting point.
– Mark Ireland
11 hours ago
5
5
How do you mesure that ? is it the longest segment perpendicular to the river centerline (and you need to define what you consider river centerline : line of max depth or centerline of your polygone or ...) you need to give more detail and say what you have already tried if you want answer
– J.R
15 hours ago
How do you mesure that ? is it the longest segment perpendicular to the river centerline (and you need to define what you consider river centerline : line of max depth or centerline of your polygone or ...) you need to give more detail and say what you have already tried if you want answer
– J.R
15 hours ago
I have updated the question, It is bank to bank I require.
– Gokul Anand
15 hours ago
I have updated the question, It is bank to bank I require.
– Gokul Anand
15 hours ago
4
4
But how do you define 'bank to bank'? You could draw a very long line from the bank near the lower left side to the upper right side, for example.
– Simbamangu
14 hours ago
But how do you define 'bank to bank'? You could draw a very long line from the bank near the lower left side to the upper right side, for example.
– Simbamangu
14 hours ago
2
2
I totaly agree with them. Question is not clear as bank to bank could be a huge line from left nord bank side to right south bank side. Otherwise you should decide first what is the center line of the river and then you can compute the longest perpendicular line all along the river.
– César Arquero
14 hours ago
I totaly agree with them. Question is not clear as bank to bank could be a huge line from left nord bank side to right south bank side. Otherwise you should decide first what is the center line of the river and then you can compute the longest perpendicular line all along the river.
– César Arquero
14 hours ago
I recently found out about Fréchet distances. Let's say you walk along one bank and your dog - on a leash - walks down the other. Walking at the same speed and direction, what's the longest leash you would need? That would give you at least one measure of the widest point. Having said that, I've no idea how you'd find that in ArcGIS (at least not without doing some Python coding). But at least it's a starting point.
– Mark Ireland
11 hours ago
I recently found out about Fréchet distances. Let's say you walk along one bank and your dog - on a leash - walks down the other. Walking at the same speed and direction, what's the longest leash you would need? That would give you at least one measure of the widest point. Having said that, I've no idea how you'd find that in ArcGIS (at least not without doing some Python coding). But at least it's a starting point.
– Mark Ireland
11 hours ago
|
show 1 more comment
3 Answers
3
active
oldest
votes
Measuring from "bank to bank" is too vague. In the image below I've illustrated 8 different ways you can measure to the south bank from a single point on the north bank (red arrow).
Which of these lines would be the "correct" line of measurement for the distance from that point to the other bank? Any point along the river has more than one possible bank to bank measurement. Using this method, you'll find that the furthest line from bank to bank will end up running nearly parallel to the river:
We need to be more precise about how the measurements should be taken.
If, as JR suggested, you measure perpendicular to the river centerline, you need to obtain a river centerline. In the example below, I drew a hypothetical river centerline.
As you can see, at any given point along the river, there's only one line that stretches from bank to bank AND perpendicular to the river centerline. So this is a better way to measure bank width.
If you choose to implement this method, your next steps should be:
- Obtain a river centerline.
- Pick a single software package. Asking for answers in more than one software package (ArcGIS and QGIS) makes a question too broad for this site. See Asking good Questions for GIS Stack Exchange? for more information.
- If you need help figuring out how to use your chosen software to measure from bank to bank and perpendicular to the centerline, edit this question or ask a new one.
I have edited the question, I need help like as in the third image
– Gokul Anand
14 hours ago
add a comment |
You could try the GRASS algorithm v.centerline
v.centerline creates a new map with a line representing an approximation of the central tendency of a series of input lines that all have similar trajectories. This can for example, be the central line of a river represented by its two sides, or a line representing the general direction of a series of flight paths, etc.
Once you have the centreline, you can use v.transects to create perpendicular lines at a very small interval, and then clip them to the boundaries of the source polygon.
I have also seen ST_ApproximateMedialAxis() in PostGIS used to derive river centrelines. From there you can use the same method as mentioned earlier with v.transects() to find the "widest portion"
As others have already pointed out, however, it is a very difficult question to answer objectively, but I think one of these methods will get you a reasonable and reproducible answer.
add a comment |
Due to complex shape of natural channels I think the diameter of largest inscribed circle is much better definition of greatest width:
Computing polygon skeleton and perpendiculars to segments are very challenging tasks.
Nice. How to obtain if I want to proceed this way?
– Gokul Anand
4 hours ago
See updated solution in gis.stackexchange.com/questions/147790/…
– FelixIP
4 hours ago
add a comment |
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3 Answers
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Measuring from "bank to bank" is too vague. In the image below I've illustrated 8 different ways you can measure to the south bank from a single point on the north bank (red arrow).
Which of these lines would be the "correct" line of measurement for the distance from that point to the other bank? Any point along the river has more than one possible bank to bank measurement. Using this method, you'll find that the furthest line from bank to bank will end up running nearly parallel to the river:
We need to be more precise about how the measurements should be taken.
If, as JR suggested, you measure perpendicular to the river centerline, you need to obtain a river centerline. In the example below, I drew a hypothetical river centerline.
As you can see, at any given point along the river, there's only one line that stretches from bank to bank AND perpendicular to the river centerline. So this is a better way to measure bank width.
If you choose to implement this method, your next steps should be:
- Obtain a river centerline.
- Pick a single software package. Asking for answers in more than one software package (ArcGIS and QGIS) makes a question too broad for this site. See Asking good Questions for GIS Stack Exchange? for more information.
- If you need help figuring out how to use your chosen software to measure from bank to bank and perpendicular to the centerline, edit this question or ask a new one.
I have edited the question, I need help like as in the third image
– Gokul Anand
14 hours ago
add a comment |
Measuring from "bank to bank" is too vague. In the image below I've illustrated 8 different ways you can measure to the south bank from a single point on the north bank (red arrow).
Which of these lines would be the "correct" line of measurement for the distance from that point to the other bank? Any point along the river has more than one possible bank to bank measurement. Using this method, you'll find that the furthest line from bank to bank will end up running nearly parallel to the river:
We need to be more precise about how the measurements should be taken.
If, as JR suggested, you measure perpendicular to the river centerline, you need to obtain a river centerline. In the example below, I drew a hypothetical river centerline.
As you can see, at any given point along the river, there's only one line that stretches from bank to bank AND perpendicular to the river centerline. So this is a better way to measure bank width.
If you choose to implement this method, your next steps should be:
- Obtain a river centerline.
- Pick a single software package. Asking for answers in more than one software package (ArcGIS and QGIS) makes a question too broad for this site. See Asking good Questions for GIS Stack Exchange? for more information.
- If you need help figuring out how to use your chosen software to measure from bank to bank and perpendicular to the centerline, edit this question or ask a new one.
I have edited the question, I need help like as in the third image
– Gokul Anand
14 hours ago
add a comment |
Measuring from "bank to bank" is too vague. In the image below I've illustrated 8 different ways you can measure to the south bank from a single point on the north bank (red arrow).
Which of these lines would be the "correct" line of measurement for the distance from that point to the other bank? Any point along the river has more than one possible bank to bank measurement. Using this method, you'll find that the furthest line from bank to bank will end up running nearly parallel to the river:
We need to be more precise about how the measurements should be taken.
If, as JR suggested, you measure perpendicular to the river centerline, you need to obtain a river centerline. In the example below, I drew a hypothetical river centerline.
As you can see, at any given point along the river, there's only one line that stretches from bank to bank AND perpendicular to the river centerline. So this is a better way to measure bank width.
If you choose to implement this method, your next steps should be:
- Obtain a river centerline.
- Pick a single software package. Asking for answers in more than one software package (ArcGIS and QGIS) makes a question too broad for this site. See Asking good Questions for GIS Stack Exchange? for more information.
- If you need help figuring out how to use your chosen software to measure from bank to bank and perpendicular to the centerline, edit this question or ask a new one.
Measuring from "bank to bank" is too vague. In the image below I've illustrated 8 different ways you can measure to the south bank from a single point on the north bank (red arrow).
Which of these lines would be the "correct" line of measurement for the distance from that point to the other bank? Any point along the river has more than one possible bank to bank measurement. Using this method, you'll find that the furthest line from bank to bank will end up running nearly parallel to the river:
We need to be more precise about how the measurements should be taken.
If, as JR suggested, you measure perpendicular to the river centerline, you need to obtain a river centerline. In the example below, I drew a hypothetical river centerline.
As you can see, at any given point along the river, there's only one line that stretches from bank to bank AND perpendicular to the river centerline. So this is a better way to measure bank width.
If you choose to implement this method, your next steps should be:
- Obtain a river centerline.
- Pick a single software package. Asking for answers in more than one software package (ArcGIS and QGIS) makes a question too broad for this site. See Asking good Questions for GIS Stack Exchange? for more information.
- If you need help figuring out how to use your chosen software to measure from bank to bank and perpendicular to the centerline, edit this question or ask a new one.
answered 14 hours ago
cskcsk
7,9751034
7,9751034
I have edited the question, I need help like as in the third image
– Gokul Anand
14 hours ago
add a comment |
I have edited the question, I need help like as in the third image
– Gokul Anand
14 hours ago
I have edited the question, I need help like as in the third image
– Gokul Anand
14 hours ago
I have edited the question, I need help like as in the third image
– Gokul Anand
14 hours ago
add a comment |
You could try the GRASS algorithm v.centerline
v.centerline creates a new map with a line representing an approximation of the central tendency of a series of input lines that all have similar trajectories. This can for example, be the central line of a river represented by its two sides, or a line representing the general direction of a series of flight paths, etc.
Once you have the centreline, you can use v.transects to create perpendicular lines at a very small interval, and then clip them to the boundaries of the source polygon.
I have also seen ST_ApproximateMedialAxis() in PostGIS used to derive river centrelines. From there you can use the same method as mentioned earlier with v.transects() to find the "widest portion"
As others have already pointed out, however, it is a very difficult question to answer objectively, but I think one of these methods will get you a reasonable and reproducible answer.
add a comment |
You could try the GRASS algorithm v.centerline
v.centerline creates a new map with a line representing an approximation of the central tendency of a series of input lines that all have similar trajectories. This can for example, be the central line of a river represented by its two sides, or a line representing the general direction of a series of flight paths, etc.
Once you have the centreline, you can use v.transects to create perpendicular lines at a very small interval, and then clip them to the boundaries of the source polygon.
I have also seen ST_ApproximateMedialAxis() in PostGIS used to derive river centrelines. From there you can use the same method as mentioned earlier with v.transects() to find the "widest portion"
As others have already pointed out, however, it is a very difficult question to answer objectively, but I think one of these methods will get you a reasonable and reproducible answer.
add a comment |
You could try the GRASS algorithm v.centerline
v.centerline creates a new map with a line representing an approximation of the central tendency of a series of input lines that all have similar trajectories. This can for example, be the central line of a river represented by its two sides, or a line representing the general direction of a series of flight paths, etc.
Once you have the centreline, you can use v.transects to create perpendicular lines at a very small interval, and then clip them to the boundaries of the source polygon.
I have also seen ST_ApproximateMedialAxis() in PostGIS used to derive river centrelines. From there you can use the same method as mentioned earlier with v.transects() to find the "widest portion"
As others have already pointed out, however, it is a very difficult question to answer objectively, but I think one of these methods will get you a reasonable and reproducible answer.
You could try the GRASS algorithm v.centerline
v.centerline creates a new map with a line representing an approximation of the central tendency of a series of input lines that all have similar trajectories. This can for example, be the central line of a river represented by its two sides, or a line representing the general direction of a series of flight paths, etc.
Once you have the centreline, you can use v.transects to create perpendicular lines at a very small interval, and then clip them to the boundaries of the source polygon.
I have also seen ST_ApproximateMedialAxis() in PostGIS used to derive river centrelines. From there you can use the same method as mentioned earlier with v.transects() to find the "widest portion"
As others have already pointed out, however, it is a very difficult question to answer objectively, but I think one of these methods will get you a reasonable and reproducible answer.
answered 14 hours ago
wfgeowfgeo
1,163317
1,163317
add a comment |
add a comment |
Due to complex shape of natural channels I think the diameter of largest inscribed circle is much better definition of greatest width:
Computing polygon skeleton and perpendiculars to segments are very challenging tasks.
Nice. How to obtain if I want to proceed this way?
– Gokul Anand
4 hours ago
See updated solution in gis.stackexchange.com/questions/147790/…
– FelixIP
4 hours ago
add a comment |
Due to complex shape of natural channels I think the diameter of largest inscribed circle is much better definition of greatest width:
Computing polygon skeleton and perpendiculars to segments are very challenging tasks.
Nice. How to obtain if I want to proceed this way?
– Gokul Anand
4 hours ago
See updated solution in gis.stackexchange.com/questions/147790/…
– FelixIP
4 hours ago
add a comment |
Due to complex shape of natural channels I think the diameter of largest inscribed circle is much better definition of greatest width:
Computing polygon skeleton and perpendiculars to segments are very challenging tasks.
Due to complex shape of natural channels I think the diameter of largest inscribed circle is much better definition of greatest width:
Computing polygon skeleton and perpendiculars to segments are very challenging tasks.
edited 4 hours ago
answered 5 hours ago
FelixIPFelixIP
16.1k11642
16.1k11642
Nice. How to obtain if I want to proceed this way?
– Gokul Anand
4 hours ago
See updated solution in gis.stackexchange.com/questions/147790/…
– FelixIP
4 hours ago
add a comment |
Nice. How to obtain if I want to proceed this way?
– Gokul Anand
4 hours ago
See updated solution in gis.stackexchange.com/questions/147790/…
– FelixIP
4 hours ago
Nice. How to obtain if I want to proceed this way?
– Gokul Anand
4 hours ago
Nice. How to obtain if I want to proceed this way?
– Gokul Anand
4 hours ago
See updated solution in gis.stackexchange.com/questions/147790/…
– FelixIP
4 hours ago
See updated solution in gis.stackexchange.com/questions/147790/…
– FelixIP
4 hours ago
add a comment |
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5
How do you mesure that ? is it the longest segment perpendicular to the river centerline (and you need to define what you consider river centerline : line of max depth or centerline of your polygone or ...) you need to give more detail and say what you have already tried if you want answer
– J.R
15 hours ago
I have updated the question, It is bank to bank I require.
– Gokul Anand
15 hours ago
4
But how do you define 'bank to bank'? You could draw a very long line from the bank near the lower left side to the upper right side, for example.
– Simbamangu
14 hours ago
2
I totaly agree with them. Question is not clear as bank to bank could be a huge line from left nord bank side to right south bank side. Otherwise you should decide first what is the center line of the river and then you can compute the longest perpendicular line all along the river.
– César Arquero
14 hours ago
I recently found out about Fréchet distances. Let's say you walk along one bank and your dog - on a leash - walks down the other. Walking at the same speed and direction, what's the longest leash you would need? That would give you at least one measure of the widest point. Having said that, I've no idea how you'd find that in ArcGIS (at least not without doing some Python coding). But at least it's a starting point.
– Mark Ireland
11 hours ago