Re: [Talk-in] Extracting rivers as multipolygons

[Aruna S]

> I'm looking at a few options for your use case. It'd be more useful if you
> could let know the scale of the project - that is the geography you're
> covering. Depending on the extent, options could be narrowed down.
>

The use-case is to extract tiles on the banks of rivers. Any river in
India, for example.
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Re: [Talk-in] Extracting rivers as multipolygons

[Aruna S]

Hey Arun,

> Find all water polygon/relations that intersect with the buffered
centerlines
This is the part I was missing. What tags would I be looking for here? I
see that for https://www.openstreetmap.org/edit#map=16/24.4812/79.8781, the
tags are
natural=water
type=multipolygon
water=river

Should this suffice for all river-cases?
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Re: [Talk-in] Extracting rivers as multipolygons

[Arun Ganesh]

On Sat, May 5, 2018 at 7:56 PM, Aruna S  wrote:

> Ramya!
>
> Hi, ok. So, do you have ideas around extracting the relations I've sent as
> an example (https://www.openstreetmap.org/edit#map=16/24.4812/79.8781) -
> for example, if I wanted to extract all relations that make up the Sutlej
> river, would I have to manually find each each relation ID and use the
> above query, or is there a simpler way to extract all the relations and
> multipolygons that compose this river?
>

Ideally, all riverbanks that are part of the river are also added into the
relevant river relation, but i think this mapping is currently incomplete.

A programmatic way to try to do this in turf could be:

   - Extract the way/centerline of the river needed
   - Convert the line into a polygon by creating a buffer around it (20m
   should work)
   - Find all water polygon/relations that intersect with the buffered
   centerlines




>
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[Talk-in] Extracting rivers as multipolygons

[Ramya Ragupathy]

Hello Aruna,

I'm looking at a few options for your use case. It'd be more useful if you
could let know the scale of the project - that is the geography you're
covering. Depending on the extent, options could be narrowed down.

Thanks
Ramya
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[Talk-in] State of the Map Asia 2018

[Jinal Foflia]

*Hello, Everyone! Bengaluru is getting ready to host State of the Map
Asia[0] this year. We’re excited to bring the conference to the garden city
of India during November 17th –18th at the Indian Institute of Management,
Bangalore[1]. We'll have participants from around the world to discuss
challenges, learn, and celebrate many years of mapping together.The Call
for Proposals for the conference is open until June 10th midnight.[2] We
are focusing on the growing OSM communities in the region — both mappers
and users of the data. We invite inclusive and diverse participation to
broaden our understanding of the OSM community, and encourage a dialogue
driven by the unique needs of users in the Asia region. If you have a great
workshop idea, a story about working with OpenStreetMap in your local
community, or a project that you want to share with us, we would love to
hear from you, please apply[2]! The conference operates as a space for
collaboration and strengthening the community. We also understand that it
is expensive to fly around the world to support the community. However, we
believe financial constraints should not be the reason we don’t get to
interact with you. In hopes of helping you out a little more, we offer
scholarships to support participants to attend the conference[3]. The last
date to apply for scholarships is 11th May.If you are interested in helping
us support[4] travel and accommodation for participants from outside the
host city, write to us at stateofthemapasia (at) gmail (dot) com and we
will provide you with all the information needed to support the
conference.For all the announcements around the conference follow us on our
Medium publication[6] and Twitter[7]. Looking forward to seeing you all in
Bengaluru!Cheers,State of the Map Asia Organising
Team--[0] - http://stateofthemap.asia/
 [1] - http://bit.ly/sotmasia2018
 [2] - http://bit.ly/sotmasia-cfp
 [3] - http://bit.ly/call-for-scholarships
 [4] - http://bit.ly/sotm-sponsorship
 [5] -
http://bit.ly/blog-state-of-the-map-asia
 [6] -
https://medium.com/state-of-the-map-asia
 [7] -
https://twitter.com/SotmAsia  *
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