(Cross-posting to the "wikimaps" list, which is the group particularly
concerned with old maps).
Hi Jason,
Whilst I'm sure the KML {{overlay}} template mentioned by Gauruv below
probably works, it's not really where things are at going forward.
The approach currently being developed for Commons is its own install of
the well-known NYPL Map Warper,
http://warper.wmflabs.org/
which is being supervised by its original developer Tim Waters under the
auspices of the Wikimaps project for old maps,
https://commons.wikimedia.org/wiki/Commons:Wikimaps
led by Susanna Ånäs. (Both on the wikimaps list).
There are various ways to get control-point data into the map warper, as
discussed by Tim in this post:
https://mail-archive.com/maps-l@lists.wikimedia.org/msg01101.html
In this case I would have thought the most straightforward approach
would be first to upload a copy of the tithe map onto Commons in its
native format, ie not as a GeoTiff, but as either an ordinary Tiff or a
Jpeg, whichever you consider the original format.
If you use the Commons {{Map}} template for the file description, this
includes a big friendly blue button to then install the image over on
the Map Warper.
As Tim writes, existing control points can then be added from a CSV
file, where the format is simply:
filename,x,y,lat,lon
ie:
IMG_1773.jpg,12,23,11.2,32.2
IMG_1773.jpg,12,23,10.2,31.1
from which there is script that an admin can use to add the data to the
map-warper.
This doesn't capture all of the data stored by Klokan Georeferencer --
eg the useful information as to what layer the image was georeferenced
against -- but is enough to get the geo-referencing data into the
system, and to then get it out in various formats, including serving
georeferenced tiles.
Sorry if it's all still a little bit round-the-houses; but with luck
everything should get a bit more streamlined, as we get more geared up
for large scale import.
(There are already a couple of thousand images on Commons with links to
external georeferencing, either at NYPL or the British Library; plus
ready to be uploaded to Commons a further 6,000 georeferenced map images
from the BL Mechanical Curator collection, just as soon as I've got
auto-categorisation a bit more worked out, with that number currently
increasing by approximately a further 100 georeferenced images a day
https://commons.wikimedia.org/wiki/Commons:British_Library/Mechanical_Curat…
).
As far as I know, nobody has yet actually used the script to import
pre-existing georeferencing onto the warper.wmflabs.org server, so I'm
quite interested to see how you get on!
Best regards,
James.
On 24/04/2015 18:02, Gaurav Vaidya wrote:
> Hi Jason!
>
>> On 24 Apr 2015, at 8:30 am, Jason J. Evans <jason.evans(a)llgc.org.uk> wrote:
>>
>> Hello,
>>
>> I would be grateful for some advise on the following matter. The NLW is interested in uploading a large Tithe Map (1840's map of a whole town) to Commons. The map has already been Geo- referenced at multiple points. Would it be possible to import that Geo referencing data into Commons?
>>
>> Will commons except a .geotiff file? or can the data be imported in some other way. The file will be close to the 1GB upload limit (manual uploader) in size and will be High Resolution.
>>
>> Thanks
>>
>> Jason
>
> The Commons used to have a system for using a KML file to georeference an image using the {{overlay}} template, but the WMF Lab tool it depends on appears to be down. I’ve left a message with the developer [1]. You can read more about the way the system is supposed to work at https://commons.wikimedia.org/wiki/Commons:Geocoding/Overlay
>
> cheers,
> Gaurav
>
> [1] https://commons.wikimedia.org/w/index.php?title=User_talk:Dschwen&diff=1586…
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