Hi Rob,
Good stuff, it's definitely worthwhile. Thinner lines could work better
(for me 1px would be perfect), especially that the max zoom stops at 17.
You could perhaps consider increasing the max zoom a notch as well.
Are the numbers in wms tiles UPRNs? If so, you could consider displaying
them as well.
Best regards,
ndrw6
On 17/10/2020 00:20, Rob Nickerson wrote:
Hi all,
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
And for now this is _York only_ as an example.
Feedback that I would appreciate:
* Is this worthwhile?
* Do you agree that it makes sense for us to all try to align our
mapping to this (i.e. apply imagery offsets to align imagery to
this before tracing)?
* The style is very simple with just a 4 pixel red line. Is this
sufficient? What changes can be made?
* Any tips on how to keep the PNG file sizes as small as possible?
For now I am using the Mapnik rule "png8:c=2:t=1:m=o". Is there
anything that can yield smaller file sizes?
* What max zoom is worthwhile? Currently it goes to 17, is this enough?
Our plan would be to pre-render all the tiles and host them on our
site. The data doesn't change much so we would only re-render on
request or once a year. My estimate is that we'd need 35GB for tiles
to zoom level 17, and 133 GB to get everything to zoom 18. Our current
server is on the small side with just 512MB memory and a 100GB disk
allowance. It is unsuitable for on the fly rendering and we'd need
more disk space to get the level 18 zoom. A beefier server is of
course possible but any bump in specs comes with an equal bump in
costs so worth checking this is worthwhile before proceeding.
P.S. The Land Registry themselves host this data on a WMS service
rather than a TMS (tile) service. This makes it possible to zoom much
further in. If you want to have a look at that detail you can use
their website or (temporarily) use the following URL in JOSM. Please
don't use this for mapping as we don't have permission to use their
WMS service
wms:http://inspire.landregistry.gov.uk/inspire/ows?SERVICE=WMS&FORMATS=image%2Fpng&LAYERS=inspire%3ACP.CadastralParcel&FORMAT=image%2Fpng&TRANSPARENT=true&VERSION=1.1.1&REQUEST=GetMap&STYLES=&INFO_FORMAT=application%2Fvnd.ogc.gml&EXCEPTIONS=XML&_OLSALT=0.789927776902914&SRS={proj}&BBOX={bbox}&WIDTH={width}&HEIGHT={height}
Best regards,
*Rob*
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