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I have run into a slight problem it would seem. Yesterday I downloaded qgis in the hope that it could convert a .kml overlay of some administrative boundaries from EPSG:3857 (Google maps) to EPSG:27700 (Ordnance Survey).

What I did: I loaded the .kml file into qgis as a vector file and then right click, save as and type in the new Projection I would like as in this photo:

However, when I load the newly created .kml in google earth, it is exactly the same. I also converted both the original and the new .kml file to a .svg using an online tool and compared them. They too were exactly the same.

Am I missing something here?

Thank you ever so much in advance for any help!

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this is John Larry speaking Thank you so far for your answers. I will try out the OpenData Boundary-Line dataset later when I get home. Could you elaborate on how to save the KML? Isn't it what I'm doing at the moment as in the photo I posted in my original post? Thank you very much in advance! –  Dr. Paul Aug 12 '13 at 10:01

2 Answers 2

KML files are always WGS84/lat lon (EPSG:4326). Save the KML file as an EPSG:27700 shapefile instead.

Alternatively, you could download the Ordnance Survey OpenData Boundary-Line dataset, which is already in EPSG:27700. See:

https://www.ordnancesurvey.co.uk/opendatadownload/products.html

N.

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As a first step, you have to set the CRS of your kml layer to EPSG:4326 instead of EPSG:3857.

You can do that with Rightclick on the layer -> Set CRS for layer.

In a second step, you can Rightclick again, Save As ... and select ESRI shapefile as output. This time with CRS EPSG:27700 British National Grid.

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