[talk-au] Importing Hobsons Bay City Council tree data into OSM

David Sisourath david.sisourath at hotmail.com
Mon Apr 15 13:17:30 UTC 2019

Hi Sebastian,

Thanks for the feedback. The trees seen in the adjacent Wyndham City Council have actually been manually mapped by another contributor.

I will change the changeset comments to be ‘Hobsons Bay Tree Import - https://wiki.openstreetmap.org/wiki/Import/Catalogue/Hobsons_Bay_City_Council’.

I have also decided to create a dedicated OSM account for the import. This will be called HobsonsBayCityCouncil_Import with the user description linking to the import page.

Let me know if anything on the import page is unclear or if anything needs changing. I will be undertaking another test import, this time in an area with existing trees.


From: Sebastian Spiess <mapping at consebt.de>
Sent: Monday, April 15, 2019 10:31:36 PM
To: David Sisourath; Andrew Harvey
Cc: talk-au at openstreetmap.org
Subject: Re: [talk-au] Importing Hobsons Bay City Council tree data into OSM

Hi David,

I'd like to say that the test import looks very impressive on the map. Thank you for your effort on this.

Are there guidelines how to mark the import in the changeset? Not having read up on it but I would think the changeset should reference the wiki page for the import?

For those who are interested in the import, see the wiki here: https://wiki.openstreetmap.org/wiki/Import/Catalogue/Hobsons_Bay_City_Council

Cheers, Seb

On 14/4/19 10:45 pm, David Sisourath wrote:
Thanks Andrew, I have looked at all of the tags in the raw data and have created a Python file to process this.

I have considered the ‘Unknown’, ‘Not Applicable’ and also removed the trees where they are ‘stumps’ or ‘vacant’.

The data is linked here:

I have actually proceeded with a test import on a small area in Seabrook. A reason why I think a source tag would be useful is the identification of imported trees in subsequent updates from Council being imported.

I note that this test import is easily reversible by me if plans do not eventuate.

The test import changeset is here:

Also, there is a non-existent boundary through Seabrook Primary School that renders on Mapnik. I noticed this during the test import and am unsure of the issue here.



From: Andrew Harvey <andrew.harvey4 at gmail.com><mailto:andrew.harvey4 at gmail.com>
Sent: Sunday, April 14, 2019 9:56:38 PM
To: David Sisourath
Cc: talk-au at openstreetmap.org<mailto:talk-au at openstreetmap.org>
Subject: Re: [talk-au] Importing Hobsons Bay City Council tree data into OSM

Great working on sourcing those waivers!

Do you either have a sample .osm file or could you post an example of what tags/values will be imported? Can you say anything further about how you will transform the data? ie. removing "Unknown" values etc.

Regarding the source tag, I think it must be on the changeset, but can optionally be on each object as well. It was once pointed out to me that the source on the object may lead to editors thinking they can't change/touch the object, and it can also be misleading when changes subsequently happen. Mind you, I still add source, source:geometry, source:name etc. tags where I feel it's appropriate manually, I just don't think it's essential to have them on each object.

Feel free to post a link to this thread https://lists.openstreetmap.org/pipermail/talk-au/2019-April/012577.html as a changeset tag or comment to help link the import back to this discussion.

On Sun, 14 Apr 2019 at 15:35, David Sisourath <david.sisourath at hotmail.com<mailto:david.sisourath at hotmail.com>> wrote:

I intend to import tree data in the Hobsons Bay LGA into OSM.

The data has been verified by myself with aerial imagery and DELWP/VicMap boundaries.

I will be importing small squares of data at a time, including the tree circumference, species (if known) or genus (if species unknown). Tree circumference in the data are grouped by ranges of 150mm. I have taken the maximum of these ranges to be the circumference in my code.

A source tag will be attached to each tree node imported, source=data.gov.au:Hobsons Bay City Council, and also on the relevant changesets.

A waiver has been signed by Hobsons Bay and is available on both the Australian Data Catalogue page and the Contributors<https://wiki.openstreetmap.org/wiki/Contributors#Hobsons_Bay_City_Council_data> page.

Any questions or feedback regarding the import would be highly appreciated, including whether the approach to the circumference tag, and source tag is acceptable.


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