[talk-au] Question about using NSW Speed Zone Data in OSM

[Bob Cameron]

Hi Mark

Although not anywhere conclusive I made a Mapillary capture outbound on 
Woore Street Wilcannia 5/2022 that shows what are likely to be the dual 
50/100 transition signs (smudges) well before the changeset. Might be 
useful..

Bob

On 19/2/24 20:19, Mark Pulley wrote:
> I haven’t done any reversions yet. I was planning to start from the 
> oldest changeset and work forwards, however the oldest changesets 
> don’s specify a source. I’ve asked about a couple of these including:
>
> https://www.openstreetmap.org/changeset/117791362 - first changeset - 
> on outskirts of Wilcannia
> https://www.openstreetmap.org/changeset/117831384 - outskirts of Old Junee
>
> Both of these are claimed to be from information provided by ’someone’ 
> who had travelled on those roads. I’ve just asked for more info 
> regarding the source of this information.
>
> I also queried a couple of recent edits from 'local information and 
> NSW Speed Data’:
>
> https://www.openstreetmap.org/changeset/147432769 - western edge of 
> Kempsey from 'local information and NSW Speed Data’ - also from 
> ’someone’ who had travelled on those roads.
>
> https://www.openstreetmap.org/changeset/146881278 - private driveway 
> near Brooms Head from 'local information’ - I had previously surveyed 
> this maxspeed, and recent Google imagery showed the same limit. No 
> reply regarding this one.
>
> How should I (or we) approach this? Will I need to check available 
> imagery for every changeset? Should I go ahead and revert the NSW 
> Speed Data ones?
>
> Mark P.
>
>> On 12 Feb 2024, at 2:45 pm, Andrew Harvey <andrew.harvey4 at gmail.com> 
>> wrote:
>>
>> No objections from me. They haven't responded yet, and from 
>> everything we can tell they imported the data without any other cross 
>> checks and didn't follow the import guidelines.
>>
>> On Sun, 11 Feb 2024 at 22:00, Mark Pulley <mrpulley at iinet.net.au> wrote:
>>
>>     I’ve got some spare time (having caught up with the surveys from
>>     my last holidays), so I can go through these and revert them. Any
>>     objections?
>>
>>     Mark P.
>>
>>>     On 9 Feb 2024, at 9:57 am, Andrew Harvey
>>>     <andrew.harvey4 at gmail.com> wrote:
>>>
>>>     We do have permissions to use this data it's listed in
>>>     https://wiki.openstreetmap.org/wiki/Australian_Data_Sources#New_South_Wales,
>>>     however from looking at their changeset history, it looks like
>>>
>>>     1. They are conducting an import by en-mass blindly adding and
>>>     replacing existing data with the imported data
>>>     2. They may be engaging in directed mapping (being employed to
>>>     make these changes), since their changesets are all the same,
>>>     importing speed limits, except for one Local Knowledge changeset
>>>     https://www.openstreetmap.org/changeset/131210459 in India.
>>>
>>>     If they want to conduct an import like this, they need to go
>>>     through the proper process, so based on and the issues you've
>>>     rased it should be fine to revert all their affected changes and
>>>     then ask going forward to go through the import guidelines
>>>     https://wiki.openstreetmap.org/wiki/Import_guidelines.
>>>
>>>
>>>     On Thu, 8 Feb 2024 at 21:32, Mark Pulley <mrpulley at iinet.net.au>
>>>     wrote:
>>>
>>>         Does the NSW Government Speed Zone data have a licence
>>>         suitable for importing into OSM? Also, is it generally
>>>         accurate?
>>>         https://opendata.transport.nsw.gov.au/dataset/speed-zones
>>>         https://opendata.transport.nsw.gov.au/dataset/road-segment-data-from-datansw
>>>
>>>         The reason I ask is that I recently came across a few roads
>>>         with speed zones updated based on this data. The biggest
>>>         problem is that the changes made in these three changesets
>>>         were incorrect (i.e. the previously surveyed maxspeeds were
>>>         updated from this data, but on survey in December 2023 the
>>>         original surveyed maxspeed was the correct one).
>>>
>>>         https://www.openstreetmap.org/changeset/129760120
>>>         https://www.openstreetmap.org/changeset/129759614
>>>         https://www.openstreetmap.org/changeset/129759603
>>>
>>>         Other changesets have been made based on this data, but I
>>>         haven’t checked the accuracy of them.
>>>
>>>         Mark P.
>>>
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