[Talk-nz] Making the LINZ NZ Building Outlines available in RapiD

Timothée Duhamel timothee.duhamel at gmail.com
Mon Aug 16 20:16:24 UTC 2021


Hi Mark,

Yes, you replied correctly to the mail list. Thank you for the feedback,
glad you're finding the RapiD tool useful.

I have been intermittently working away at Auckland central building
outlines. My approach is to use two different imagery layers I switch
between (shortcut Ctrl+B to toggle layers) which help me assess and refine
the building outlines as I add them:
*2017 high resolution aerial from LINZ*: this is the imagery that the
building outlines were generated from, in Auckland. This layer helps me
pick up the occasional false positive outlines where there are (for
example) shade sails and patios which were classified as buildings.
*Recent 2021 Maxar imagery, low resolution*: This layer is helpful to
identify buildings which have been demolished since 2017, and new buildings
which I manually draw in.

> It seems the data set already has exsiting buildings (which would be
duplicated) removed from the RapiD layer - is that the case?

Correct, this filtering happens on-the-fly, as the data is brought into
RapiD (those building outlines still exist in the underlying dataset
<https://www.arcgis.com/home/webmap/viewer.html?useExisting=1&layers=ef9136b079e24bbfb432be9bbdd246ff>).
I like this approach, though I am occasionally frustrated when a block of
very roughly sketched buildings prevents the LINZ outlines from showing.

For those interested, I updated the import wiki page
<https://wiki.openstreetmap.org/wiki/Import/New_Zealand_Buildings> with a
link to this OSMCha filter
<https://osmcha.org/filters?aoi=155a8e14-714e-4f33-bcc4-8bc77fbd970d>,
which is a way to inspect how other contributors are importing the dataset.

Cheers,
Tim

On Mon, Aug 16, 2021 at 9:52 PM Mark Begbie <mark at begbie.org> wrote:

> Apologies if this ends up in the wrong place - not used email lists in a
> long time and not sure I'm replying the right way...
>
> Thanks to all the folk who've put in work to make the LINZ building
> outlines available.  I've just come across this, along with RapiD and the
> MapWithAI plugin for JOSM today.  I've had a quick go with RapiD (two
> imports) on buildings in Papamoa and based on that, I agree with the
> earlier comment "My suggestion is for the former: *Make the building
> outlines available on Rapid for mappers to use ad-hoc as they wish*."  The
> outlines need some editing in many cases, so a bulk import would be risky.
>
> It seems the data set already has exsiting buildings (which would be
> duplicated) removed from the RapiD layer - is that the case?
>
> Anyway, thanks for this, happy to start using this approach (it makes
> things faster) and also looking forward to getting more involved with the
> community.
>
> Best,
>
> Mark
> _______________________________________________
> Talk-nz mailing list
> Talk-nz at openstreetmap.org
> https://lists.openstreetmap.org/listinfo/talk-nz
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstreetmap.org/pipermail/talk-nz/attachments/20210817/27dc45f2/attachment.htm>


More information about the Talk-nz mailing list