Changeset: 37361148
Fixing Myanmar boundaries
Closed by gadm_happy
Tags
created_by | JOSM/1.5 (8931 en) |
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source | wiki/Import/Catalogue/Myanmar/Boundaries |
Discussion
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Comment from westnordost
Most districts of Eastern Yangon (work in progress) already have an administrative boundary on the map which is also more detailed as the one you imported. So the information you added is duplicate.
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Comment from westnordost
Oh well, since I am the only one who started adding the administrative boundaries to Yangon, I will take on the merging of the duplicated data. So, no action required from you, but please be more cautious of existing data when importing datasets in the future.
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Comment from gadm_happy
Ok, thank you. I checked the country for administrative boundaries ways and relations a couple of days ago and there was nothing yet, you uploaded it recently? Do you have a link of the changeset?
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Comment from westnordost
I added the districts one after another in different changesets. Affected are the borders of every township in Yangon Eastern District ( see https://en.wikipedia.org/wiki/East_Dagon_Township#/media/File:Yangon_Districts_and_townships.png ) except for North Okkalapa Township. So this is Botataung Township, Dagon Seikkan Township, East Dagon Township, North Dagon Township, Pazundaung Township, South Dagon Township, South Okkalapa Township, Thingangyun Township. But nevermind that, I am currently merging the borders of the imported data with the one I added earlier. Though, there are some discrepancies. We have to decide which version of the data should be used on OSM (see next message).
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Comment from westnordost
Discrepancy 1: The imported data splits Yangon into "Yangon, West" and "Yangon, East" while the previous data (derived from information on Wikipedia) splits Yangon into 4 districts - North, West, East, South. So, which one is correct, wikipedia or import (=MIMU?)? At first glance, it looks like MIMU data "Yangon, West" coincides with wikipedia data "Western District" + "Northern District" and MIMU data "Yangon, East" coincides with wikipedia data "Eastern District" + "Southern District". If this is the case, I suggest we take the wikipedia data as it seems to be more precise.
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Comment from gadm_happy
Yes please, I agree with you. Do the mergings as you consider. Meanwhile I'm merging the outter districts/regions to the current Myanmar level=2 boundary (the country borders will be respected carefully).
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Comment from westnordost
For a moment I panicked in the fear of OSM conflicts, but Yangon city level is 4 *phew*. So I am merging admin-level >= 4.
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Comment from westnordost
Another discrepancy which needs to be resolved now. Which of the two is correct might be guesswork, but we need to decide on one now to remove the duplication. These two relations describe the same township:
wikipedia data: "East Dagon" https://www.openstreetmap.org/relation/5834432#map=13/16.9149/96.2883&layers=N
MIMU data: "Dagon Myothit (East)" https://www.openstreetmap.org/relation/5996591#map=12/16.9476/96.2663See also this note where I already did a bit of research: https://www.openstreetmap.org/note/496215
What is your opinion?
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Comment from westnordost
All duplication except for the townships involved in data discrepancy between MIMU and wikipedia (South Dagon, Dagon Seikkan and East Dagon) are resolved now.
I tend toward using the MIMU data because
1. it fits to the other parent level MIMU data - using wikipedia data would leave a hole where it is unspecified what township an area belongs to
2. I have a hunch that the wikipedia data may be originally based on a copyrighted map even though it claims not to (it claimes to be based on openstreetmap) -
Comment from gadm_happy
Hmm, I let the decisions about Yangon merging totally up to you, if you see some natural river that clearly limits the boundaries better shape the already existing boundary to follow the river, e.g.
BTW, I read in the wiki to avoid connecting the boundaries directly with rivers or other physical ways, not sure if you agree about it:
https://wiki.openstreetmap.org/wiki/Relation:boundary -
Comment from westnordost
Yes I totally get the point of the guy who wrote that into the wiki. Though I think the assumption that stands behind that guideline is less valid for Myanmar. I.e. I believe borders are officially set in text form ("up Pazadaung Creek until Nga Moe Yeik, then...") rather than in cadastre form.
But still, thanks for the info, I will review my borders to take this into account
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Comment from lukasmartinelli
Why are the borders on the coastline around Tanintharyi mapped?
In most of the world coastline is not mapped as separate administrative boundary since it is included in the maritime boundary. -
Comment from Kapis
Lukas, can you send a openstreetmap id of that relation u mention?
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