[Talk-GB] Update: Deploying our own version of NYPL Building Inspector

Rob Nickerson rob.j.nickerson at gmail.com
Mon Jun 2 17:05:38 UTC 2014

Well we can certainly get on with the website. The bits that people fix are
only the major issues (processed as individual buildings) so I don't think
they'll fix any "terrace gap" issues. I was hoping to use Strava Slide
before people start manually fixing but we could always do it after instead
(and then just eyeball it ourselves for any new errors).

So we can ignore the old github repo and use the new one then? I'm busy
this week but will aim to look at the website from next week. If anyone has
some good images we could use in place of the default NYPL ones then shout


On 2 June 2014 15:15, Tim Waters <chippy2005 at gmail.com> wrote:

> Hi folks,
> here's my thoughts
> Moving forward:
> Remember that people will fix the automatic vectorisations if they are off
> - they can also add extra buildings if need be also.
> I think we have enough to move it forward and see what happens. As the
> NYPL Building Inspector says: "Don't let perfect be the enemy of good"
> Branding:
> Yes I think it should be branded an OHM project - but with space for
> donors and supporters particularly if other organisations apart from NLS
> want to get involved.
> I've also forked the project into the OpenHistoricalMap repo
> https://github.com/OpenHistoricalMap/building-inspector as I think that's
> the best place for it (not sure why I didn't do that at first, tbh)
> cheers,
> Tim
> On 1 June 2014 18:25, Rob Nickerson <rob.j.nickerson at gmail.com> wrote:
>> Hi All,
>> An update on progress deploying our own version of NYPL's historic map
>> vectorizer/building inspector tool [1].
>>    1. Chris Fleet from National Library of Scotland (NLS) has kindly
>>    provided a couple of GeoTiff example scans from their London 1890's maps
>>    [2].
>>    2. Using the NYPL map-vectorizer [3] I am able to get initial
>>    building outlines from these maps.
>>    3. Tim Waters has managed to get a copy of the NYPL website up ready
>>    for loading NLS's maps/vectorized buildings. This is at [4]. Meanwhile he
>>    has opened initial conversations with the British Library who also have a
>>    good collection of historic maps.
>>    4. I am concerned that the initial building outlines end up leaving
>>    gaps between terraced buildings. This is due to the way that the NYPL
>>    map-vecotrizer works to trace the _inside_ of buildings. I'm no GIS expert
>>    so may be missing a simple solution. However I have noticed that we could
>>    use the Strava Slide tool [5] to 'slide' the building polygons onto the
>>    building walls. In essence this works by using pixel "blackness" of the map
>>    scan (rather than GPS traces as per the initial Strava Slide tool).
>>    5. I have contacted Paul at Strava to ask about this. He thinks the
>>    idea is a really good one and is hoping to add the functionality we will
>>    require. He's a bit busy at the moment but is presenting at FOSS4G (in
>>    September?) and would like to use this as an example of what's possible
>>    with slide.
>> So, where does this leave us? Well we're at the same place as NYPL so
>> could go ahead with adapting the website Tim put up to our needs and then
>> launch when ready. Or, we could hold off until Paul at Strava is able to
>> add the functionality we need to the Slide tool.
>> Thoughts?
>> Also, are folks happy for this to be branded as an OpenHistoricalMap
>> project? (Chris at NLS is okay with this).
>> Regards,
>> Rob
>> [1] http://buildinginspector.nypl.org/
>> [2] http://maps.nls.uk/os/london-1890s/index.html
>> [3] https://github.com/NYPL/map-vectorizer
>> [4] http://leatherwood.herokuapp.com/
>> [5] http://labs.strava.com/slide/
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