Re: [Talk-GB] Generating Mapnik Images to epsg:27700 (British National Grid) Projection
On Thu, Apr 23, 2009 at 4:20 PM, Kev js1982 wrote: > depending on what the data is stored in - alas I have an issue where it > isn't rendering tiles properly, looks to be memory related - those with > really complex coastlines (North West Wales) are rendering in sea colour, > and those with less complex coastlines (Birmingham) are only rendering roads > for the first 50px or so from the left. i remember i had the same problem when i was trying to render tiles in OSGB. i managed to "fix" it by importing the UK extract of the planet into postgis in OSGB, rather than spherical mercator. if i remember right, the problem stemmed from mapnik converting the bounding box from the rendering CS into the DB CS (i.e: OSGB->900913) to do the query and then converting it to the "screen" CS (i.e: 900913->OSGB-ish) to setup the draw clipping box. it wasn't calculating the second transform correctly - or the results were being swamped by numerical error - so the clip box was offset from the drawing area, producing the blank areas you're seeing. i can't remember why i didn't fix mapnik, but i think it may have been easier to just re-import the database in the "native" projection and avoid all the issues. hope this helps, matt ___ Talk-GB mailing list Talk-GB@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-gb
Re: [Talk-GB] Generating Mapnik Images to epsg:27700 (British National Grid) Projection
I'm fairly sure that the OSGB36 (36 being a year) transformations are fairly publicly known. The more detailed OSTN02 transformations are copyrighted (and very hard to get a hold of). There's a bit of info on what OSTN02 actually is here - http://www.ordnancesurvey.co.uk/oswebsite/gps/osnetfreeservices/about/faqs_osnet.html#4 2009/4/24 Tim Waters (chippy) : > please correct me, I want to be wrong, I heard yesterday that by > projecting any data into OSGB, the OS has copyright / dominion over > it, since they "own" that coordinate system. > > ___ > Talk-GB mailing list > Talk-GB@openstreetmap.org > http://lists.openstreetmap.org/listinfo/talk-gb > -- Regards, Thomas Wood (Edgemaster) ___ Talk-GB mailing list Talk-GB@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-gb
Re: [Talk-GB] Pateley Bridge mapping party 7th June 2009 with the AGI Northern Group SIG
Grand! There are certainly some excellent walks in the area, alas all done in my dark pre-GPS past. If any one is interested in industrial archeaology, the area to the north of the road between Pately Bridge and Greenhow Hill is full of old lead mines, and, at least when I last went there, has ruined smelt mills and the like. Greenhow Hill itself is the site of Roman silver and lead mining. I've mapped the eating places on the west side of the town but haven't been in the centre. From that I recommend looking at (all mapped http://www.openstreetmap.org/?lat=54.08531&lon=-1.76063&zoom=17&layers=0B00FTF): - The Bridge Inn, slightly north of town on the Low Wath Road. Yes, it is a pub but has a watermill in the ground and, as I recall, outdoor eating area, so may be kid friendly. - For picnics, the park by the river (mapped green area), you may well get your own live band in the bandstand on a summer Sunday. The universe famous Otley Silver Band plays there. - The Lemon Meringue Tea Rooms - looks OK, may be small. Mike At 15:20 24/04/2009, Tim Waters (chippy) wrote: Hi Folks, been on the cards for a while, but we've decided on a location, Pateley Bridge, in North Yorkshire, a nice little place, with the UK's oldest sweet shop, apparently! All welcome, the more the merrier. The surrounding area needs mapping too, and there should be excellent walks nearby. Sunday 7th June, for one day http://wiki.openstreetmap.org/wiki/Pateley_Bridge_Mapping_Party If there's enough interest, lift shares / minibuses could be arranged. It's being run In collaboration with the AGI Northern Group - sign up on the OSM wiki, but also (its free!) sign up on the groups event page http://www.agi.org.uk/sig/north so they can get accurate numbers. Also, it's got 4 CPD points, for those doing profession development / or going for their Chartered Geographer. If you know the area, we are after a nice family friendly venue to meet for the day, perhaps a cafe? We may also be getting the loan of some GPS units from the Environment Agency. Cheers! Tim ___ Talk-GB mailing list Talk-GB@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-gb
Re: [Talk-GB] Generating Mapnik Images to epsg:27700 (British National Grid) Projection
please correct me, I want to be wrong, I heard yesterday that by projecting any data into OSGB, the OS has copyright / dominion over it, since they "own" that coordinate system. ___ Talk-GB mailing list Talk-GB@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-gb
[Talk-GB] Pateley Bridge mapping party 7th June 2009 with the AGI Northern Group SIG
Hi Folks, been on the cards for a while, but we've decided on a location, Pateley Bridge, in North Yorkshire, a nice little place, with the UK's oldest sweet shop, apparently! All welcome, the more the merrier. The surrounding area needs mapping too, and there should be excellent walks nearby. Sunday 7th June, for one day http://wiki.openstreetmap.org/wiki/Pateley_Bridge_Mapping_Party If there's enough interest, lift shares / minibuses could be arranged. It's being run In collaboration with the AGI Northern Group - sign up on the OSM wiki, but also (its free!) sign up on the groups event page http://www.agi.org.uk/sig/north so they can get accurate numbers. Also, it's got 4 CPD points, for those doing profession development / or going for their Chartered Geographer. If you know the area, we are after a nice family friendly venue to meet for the day, perhaps a cafe? We may also be getting the loan of some GPS units from the Environment Agency. Cheers! Tim ___ Talk-GB mailing list Talk-GB@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-gb
