Tag Archives: KML

Developer needed to make Wikidata’s geographical data compatible with GPS tools

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Wikidata needs an open-source developer to make its geographical query results compatible with GPS devices and other geo-spatial tools. Here’s why…

If you query Wikidata (the database sibling project of Wikipedia) for geographically locatable subjects (say, a list of accredited museums in the UK) the results are returned in a table.

When the data has coordinates, with a single click (on the left-hand menu, in desktop view) the results can also be displayed on a map.

The tabular data can be downloaded (via the right-hand menu) in a number of formats, such as CSV, HTML or JSON.

The Wikidata community would like users to be able also to export the data in one or more GPS-friendly formats. These are not only useful for GPS devices, but are compatible with other mapping and visualisation tools. I opened a ticket for this feature request—in 2019!

A patch to do this, supporting GPX, GeoJSON and KML, has been coded. However, it relies on a number of libraries, which in turn introduce numerous dependencies on other libraries. Because these libraries all need to be security-checked, and maintained, using the patch would be cost-prohibitive. As a result, it has been declined.

We are told that it should be possible to code the conversions directly, so that the libraries are not needed. Or to look at removing what we do not need from those libraries. This “requires a developer with a bit more understanding of the formats to look into it”.

I’m not a developer, and the nuts-and-bolts of this are mysterious to me.

We need someone with the relevant knowledge and experience, willing to work on an open-source fix, for the common good.

Who will step up and take on this pro-bono work?

Update: 18 June 2025—WDQS now offers GeoJSON downloads for results that include coordinates. KML & GPX should follow. See the ticket link, above, or try it for yourself here (works best on desktop; mouse over right-hand edge to get menu with download link).

Proposal: generate KML from postcodes in Twitter messages

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Here’s an idea I’ve just had, and mentioned on Twitter:

It would be cool if someone with the necessary skills and bandwidth could provide a service which takes a Twitter search (say, for a hashtag), extracts from it , or postcode districts (the first half of a postcode, such as “B44”), and returns a corresponding KML file, which can then be passed to other services, like Google Maps.

It would enable anybody to create a service like Ben Marsh‘s excellent #UKSnow map, but on the fly, and for any term or hash-tag; and especially for one-off or short term issues. Imagine, for instance, the . I could post on Twitter, say:

I just saw a #ShootingStar in B6!

(I did, too!) and others might reply:

I saw #ShootingStar from Waverley Station, EH1 1BB

Good view of #ShootingStar in S9, too!

and we’d very quickly have a map of places from which it had been seen — in the event, such information was posted to Twitter, but there was no easy way to collate it.

A similar service, returning KML for geo-coded tweets, would also be useful, and internationally too, and something combining both might also work.

A task for an upcoming hackday, perhaps? Or one you might like to tackle…