Recent diary entries
The Power tagging scheme went through quite a bit of thought in 2013. Unfortunately, living on only a couple of OSM mailing lists, I didn't get to see any of the discussion. While most of the suggestions are pretty reasonable (if occasionally requiring improbably levels of system knowledge likely only known to employees) one part confuses me: generator:source vs generator:method.
The Wind Farm Tagging Thing
Anyway, while adding a small wind farm near where I grew up, I noticed a rather neat convention for grouping turbines into a wind farm: using a relation, as in:
<relation id='4515485'> <member type='node' ref='3308390472' role='generator' /> <member type='node' ref='3308390473' role='generator' /> <member type='node' ref='3308390474' role='generator' /> <!-- … more member nodes, one for each turbine --> <tag k='name' v='Middleton Wind Farm' /> <tag k='site' v='wind_farm' /> <tag k='type' v='site' /> </relation>
(real link: Middleton Wind Farm)
This is a tidy way of grouping turbines, as many wind farms aren't clearly enclosed. You could have all sorts of roles for transmission lines, control rooms, visitor centres, …
I'm pleased to see that the tagging scheme seems to be informally named after Carland Cross wind farm. Carland Cross was the first wind farm I worked on. Here's a view over to Newquay, as it looked to me in the summer of 1993:
It turns out that mmather's grandfather, and my great-grandfather, were colleagues at the Royal Technical College in Glasgow (now The University of Strathclyde), Scotland. Just recently, my brother found our great-grandfather's hand-written application to become a member of the Institution of Mechanical Engineers from 1913. There on the page was my great-grandfather's signature — with mmather's grandfather's signature next to it as witness.
Small world indeed.
MetaFilter user jjjjjjjijjjjjjj would like some help to finish a project to bike down every street in St Louis. Some of the routing logistics seem a little out of reach for jjjjjjjijjjjjjj, and the city's streets could always use a little more love from the OSM community.
I'm way out of town and loaded down with my own projects, but I thought some people here might be interested.
I just mapped Warden Hilltop Community Centre. It has a “green roof” — part of the roof has growing turf, and a trail through it (which would explain how I managed to put a gps trail through the building ☺). How would I tag it?
Green roofs are kind of a thing (and not just 'cos I briefly worked for Green Roofs for Healthy Cities). I can think of some:
Back in Scotland for a week, and couldn't be bothered to buy new maps for the Garmin. I thought I'd download TalkyToaster's FREE* British Isles Maps. So far, the roads and routing have been great. The same can't be said of my driving on the other side of the road, though ...
Pretty near the location I've tagged in this entry, there used to be an ancient cast-iron CTC "Good Road" plaque.
Has anyone had positive results using the Nexus 7 tablet for mapping? If it has a real GPS built in, it might be a handy alternative to a clipboard and separate GPS ...
109 waypoints around Elliot Lake in an afternoon teaches you one thing about mapping: it always rains heaviest when you're furthest from shelter. I got drookit.
Because the town lost its mall early in the summer, the shopping and social focus appears to have moved away from that part of town. I tried to map every shop and facility that I could downtown.
Almost all of the waypoints were captured with my trusty 60CSx, though a couple were done with iLOE. I have to say, I'm not impressed with the iPhone's GPS. Even when iLOE is reporting ±5m, I'm seeing it place points more than 50m off where my Garmin and Canvec says it should be.
Incidentally, if you ever make it up here, Topper's Pizza provides epic mapping fuel, and the Java Jolt café next(ish) door has coffee and wireless ...
I realised I had a tonne of wind farm survey data I'd amassed over the years, and little of it had been put into OSM. Most of it's in Ontario, but some is in the UK and elsewhere. Some was just rough locations I'd noted from air surveys and needed cleaning up. Where known, I've put in the manufacturer and power rating of each turbine.
I had to make my peace with JOSM, as Potlatch annoyingly tags wind turbines as 'power_source=wind', instead of the preferred 'generator:source=wind'. JOSM's a pain on the Mac, until you learn the trackpad gestures, and that Paste on Java is Ctrl+V and not Command+V (grr grr grr). Should really also fix the mapnik wind turbine symbol, as the green shaded tower is a registered trademark of ENERCON GmbH.
It was good to finally put projects I'd worked on (like Erie Shores Wind Farm) on the map — even if I had to resort to the dog-slow USGS WMS server and pointen-clicken to do so!
Rural southern Ontario doesn't have the best quality Bing imagery, likely due to its low population density. But the USGS does, so if you set your background to be "OSM US USGS Large Scale Aerial Imagery", you'll be more likely to map accurately from it.
Not quite sure what to use as the source tag, though. USGS? Updated: Thanks to Sanderd17, it should be source=USGS Ortho.
Note that this imagery doesn't go very far north into Canada; it's definitely not available up in Algoma.
I didn't think when I mapped this on a beautiful day in September 2010 it would be the site of a tragic accident:
My thoughts are with this northern community at this terrible time.
Having seen some of my carefully GPS walked/biked local trails being modified by distant mappers relying on out-of-date Yahoo/Bing mapping, I wonder if we should consider weighting edits based on how far they are from a mapper's home base?
How would you feel if your edits were ranked by the inverse square of the distance from your base?
Had to delete RCAF Port Albert *again*. The runways have been gone since 2006, and under soybeans since then. Just because CanVec says it's there doesn't mean it's there, okay?
I got the Triton 400 cheap for work when we needed a GPS in a hurry. I don't really recommend it; I've added some details in the reviews section.
One thing I just found out is that while it can generate track points at 1Hz, tracks are limited to 5000 points, and stop logging when full. That means you've got about 1 hr 20 for each map outing with the Triton ...
We're in this pleasant little Northern Ontario town for a few days. I'm trying to add some local features while I can. I've got my Walking Papers ...