Nice one. I've been wanting to do this for ages. Re: file size. Can JOSM and iD display Mapbox .pbf vector tiles? These would be smaller.
On Sat, 17 Oct 2020, 00:22 Rob Nickerson, <rob.j.nicker...@gmail.com> 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} > <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=%7Bproj%7D&BBOX=%7Bbbox%7D&WIDTH=%7Bwidth%7D&HEIGHT=%7Bheight%7D> > > Best regards, > *Rob* > _______________________________________________ > Talk-GB mailing list > Talk-GB@openstreetmap.org > https://lists.openstreetmap.org/listinfo/talk-gb >
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