[Talk-GB] OSM UK's first tile layer

[Robert Whittaker (OSM lists)]

On Sat, 17 Oct 2020 at 00:22, Rob Nickerson <rob.j.nickerson at gmail.com> wrote:
> Just in time for the AGM, I have just published OSM UK's first tile layer. No don't get too excited it is not a full map render. Instead I have produced a very simple tiling of the Land Registry polygon data now that this is under the OGL Open Data Licence. My view is that this is a good layer to align our mapping too - i.e. when tracing from imagery we should first align the imagery to the Land Registry polygon layer before tracing from the imagery.
>
> The tile URL for JOSM is:
> tms[13,17]:http://tiles.osmuk.org/LRpolygons/{zoom}/{x}/{y}.png

Excellent. Ever since the new Bing imagery landed, I've been after a
good source to align things to. I've been having to rely on my own GPS
traces and/or existing mapping so far.

By the way, when there was some previous discussion on this list about
using OS data for imagery alignment, an issue was raised about needing
to ensure any transformation from OSGB grid coordinates to WGS84 is
accurate enough:
https://lists.openstreetmap.org/pipermail/talk-gb/2020-August/025077.html
. Popular transforms may be out by a few meters (which would be
noticeable in our detailed mapping.) Are you doing such a
transformation, and are you sure what you're doing is sufficiently
accurate?

Robert.

-- 
Robert Whittaker

-- 
Robert Whittaker