On 11 Mar 2015, at 09:37, Magnus Manske <magnusmanske@googlemail.com> wrote:
On Wed, Mar 11, 2015 at 9:24 AM Markus Krötzsch <markus@semantic-mediawiki.org> wrote:

No, you are right: this is of course an issue in the completeness of our
data. If you zoom in to Europe, you can see that some countries have
costs full of lighthouses, while others seem to lack them almost
completely. I think it clearly shows that a lot of our data comes from
Wikipedias (in some specific language).

In this instance, the issue appears to be that the existing lists on Wikipedia have not been touched, e.g.:
https://en.wikipedia.org/wiki/List_of_lighthouses_in_Spain

These, including redlinks, could be imported into Wikidata rather easily. Some already have images.

Ideally, we'd want some "official" (e.g. national, UN) source to cross-check.

This is probably the best source:

NGA List of Lights
"The List of Lights, Radio Aids and Fog Signals is published in seven volumes, as Publication numbers 110 through 116. Each volume contains lights and other aids to navigation that are maintained by or under the authority of foreign governments." 
http://msi.nga.mil/NGAPortal/MSI.portal?_nfpb=true&_st=&_pageLabel=msi_portal_page_62&pubCode=0007
The US also have another lights list for US
http://msi.nga.mil/NGAPortal/MSI.portal?_nfpb=true&_pageLabel=msi_portal_page_62&pubCode=0014

For the US the NOAA have publicly accessible ENC marine charts which show 'lights':
http://www.nauticalcharts.noaa.gov/ENCOnline/enconline.html


The US also have sailing guides:
the regions http://msi.nga.mil/MSISiteContent/StaticFiles/Images/SDLIMITS.jpg 
where to get the pdf from http://msi.nga.mil/NGAPortal/MSI.portal?_nfpb=true&_st=&_pageLabel=msi_portal_page_62&pubCode=0011
Also Sailing Directions (Enroute) http://msi.nga.mil/NGAPortal/MSI.portal?_nfpb=true&_st=&_pageLabel=msi_portal_page_62&pubCode=0010
Here is a 10MB  example http://msi.nga.mil/MSISiteContent/StaticFiles/NAV_PUBS/SD/Pub132/Pub132bk.pdf 

There is also a crowdsource project here:
http://wikimapia.org/#lang=en&lat=38.315801&lon=-4.954834&z=7&m=b&tag=782

Also the The Lighthouse Directory (University of North Carolina at Chapel Hill)
http://www.unc.edu/~rowlett/lighthouse/



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