topic Re: Variable width buffer along line in Python Questions

Variable width buffer along line

BartoszBrzeziński1 — Wed, 24 Aug 2016 08:31:21 GMT

Hi everyone!,

i`m using Arcgis Desktop 10. 4 and i`d like to somehow obtain even distribution of value along line. I have river line. At the beginning of river section value is 3 meteres, at the end 6 meters - random values to present issue. Is it possible to get even distribution along that section? Thanks for help.

Re: Variable width buffer along line

DanPatterson_Retired — Wed, 24 Aug 2016 09:07:34 GMT

Can you clarify... you have shown a start and end line, perpendicular to the river... are the lines to be spaced with an increasing length and constant spacing?

Re: Variable width buffer along line

BartoszBrzeziński1 — Wed, 24 Aug 2016 09:22:28 GMT

Lines presents start and end of section but also places where buffer should start with 3 meters width and end with 6 meters width. Next image should explain this better.

Re: Variable width buffer along line

DanPatterson_Retired — Wed, 24 Aug 2016 09:45:27 GMT

http://www.arcgis.com/home/item.html?id=cd40be82edb74da78fcf1c0ad07f3e11 Cone line buffer... then trim/clip to suit

Re: Variable width buffer along line

BartoszBrzeziński1 — Wed, 24 Aug 2016 10:16:17 GMT

The result. Nice tool but it works for just only straight lines.

Re: Variable width buffer along line

DanPatterson_Retired — Wed, 24 Aug 2016 11:49:44 GMT

ahh... should have used that as your example photo...

check Darren's example and see it handles inconsistent angles... can't remember, but I am sure the code could be modified for your situation

https://community.esri.com/message/622726

Re: Variable width buffer along line

JayantaPoddar — Wed, 24 Aug 2016 12:01:05 GMT

There should be better methods than the following.

Make a copy of the line feature before following the methodology. Also the layer/data frame should be in Projected Coordinate System with map unit in meters.

1. Cut and delete any unnecessary portion of the line for which you don't want to create the buffer.

2. Split the line into n equal parts. The more number of parts you create, the smoother output you will get (say you divide it into 60 parts since it is a multiple of 3).

2. Add a field (Float) to the attribute table for the buffer distance. Fill the attribute values using Attribute editor in regular intervals like 3, 3.05, 3.1, 3.15,....., 5.9, 5.95, 6. (Tedious task I know).

3. Create buffer based on the above Field.

Re: Variable width buffer along line

BartoszBrzeziński1 — Wed, 24 Aug 2016 12:10:49 GMT

Thanks once again but i have no experience in Phyton.

Re: Variable width buffer along line

BartoszBrzeziński1 — Wed, 24 Aug 2016 12:38:59 GMT

Could you help me with that code?

Re: Variable width buffer along line

DanPatterson_Retired — Sat, 11 Dec 2021 15:43:42 GMT

I'll let Darren Wiens‌ fill in the final code, but these need to be changed as well as giving file paths instead of the in_memory locations

lines = r"c:\temp\myline.shp"   # or r"c:\temp\some.gdb\myline"
...  
max_buff = 50 # buffer at line start  
min_buff = 10 # buffer at line end ‍‍‍‍

if it works... you save the result