My comments on both suggestions:
- Speed Limits: a little bit boring, *BUT *there are some relatively achievable targets. For instance getting all primary & trunk roads with speed limits. There are areas of the country where none of these roads have limits, but even in well mapped places there is a considerable amount of simple tidying up (missing speed limits on roundabouts or short sections) which can be done. A further advantage is that major roads are also more likely to have Mapillary/OpenStreetView coverage. Additionally things like number of lanes, availability of pavements etc can be added as well whilst reviewing speed limits. I noticed this a few weeks ago because back in September last year I drove to Bewdley & waypointed changes of speed limits on the A456 from Hagley to Kidderminster. One additional caveat is that speed limits on the narrower roads are changing a lot: national speed limits to 50, 50 mph down to 40 mph, etc. I've noticed this particularly along the A606 as travel this by bus about once a year when I take more mapping notes. I have put a map based on this <http://overpass-turbo.eu/s/imj> Overpass-turbo query on Flickr <https://flic.kr/p/LJuZiC> for trunk roads missing speed limits, and one for primary roads in the East Midlands here <https://flic.kr/p/M1tzcj>. The latter query <http://overpass-turbo.eu/s/imi> returns too much data for the whole of the country but can be tailored by changing the area part of the query. - Food Hygiene data. This would be in two forms: enrichment of existing OSM data (primarily with addresses); and surveying areas which have lots of FHRS data but little in OSM. The former is a valuable, but not particularly gripping activity. IIRC the FHRS data covers somewhere between 10-15% of total postcodes, and just having one address in a postcode can help resolve many adjacent ones. Two addresses and one can infer properties of how addresses are allocated on a road. Last year Peter Reed wrote a long series of blog posts <http://tlatet.blogspot.co.uk/2015/08/osm-retail-survey-conclusions-1.html> about retail data and used Super Output Areas to predict volumes of missing data from OSM. Last year I targeted Melton Mowbray, Coalville, Havant and Chichester for mapping of the town centres based on this data. More recently I've done Hoylake & New Brighton. I'd hoped to have a look at Hyde, Tameside at the weekend, but was too tired by the end of the field meeting. Most towns in Greater Manchester are ripe for this kind of mapping: Oldham, Rochdale, Hyde, Denton, Ashton-under-Lyme and many others. In the past I have used a set of postcode centroids denoting places with missing data to help target the mapping. More recently I have munged the FHRS data by distributing all places sharing a postcode on a circle of 10-20 m radius and created GPX files for particular areas: with each FHRS category having a different symbol. A town the size of Melton Mowbray took around 90 minutes to do a photo survey. Adding the data to OSM rather longer. Stockport, another, larger, retail centre, which I have now surveyed in 2015 & 2016, took about 3 hours altogether. Some of this was duplicated, and in part was because the Merseyway Shopping Centre closed before I got round it on my first visit. A second visit is useful because one inevitably notices anomalies which require investigation when entering the data. My strategy is to take photos and a limited number of notes or audio files, and therefore maximise mapping time. This is all based on FHRS having all the other relevant data, which doesn't work everywhere. In summary using FHRS data enables a fairly targeted approach to mapping town centres. It greatly helps in assembling address data in such places and, of course, adds to the detail. For the mapper it's quite rewarding because one can quickly see the impact. Although shops can change a lot, having the much less ephemeral address data ensures this is not a Red Queen ('running to stay still') task. Jerry On 13 September 2016 at 09:25, Ed Loach <edlo...@gmail.com> wrote: > Paul commented on John's suggestion: > > > Speed limits would be a good one, although impossible to armchair-map > unless you know > > something I don't. Also, would it stem the tide of useless speed limit > notes from Navmii GPS users? > > I can't guarantee it would stem the tide of Navmii speed limit notes, but > I added lots of speed limits locally when Skobbler were creating MapDust > notes and it seemed to stem that tide. > > I like Robert's fhrs suggestion - I keep meaning to cross check what is > and isn't mapped against the fhrs list but haven’t got around to it. Making > it a project might spur me to do so. > > Ed > > > _______________________________________________ > Talk-GB mailing list > Talk-GB@openstreetmap.org > https://lists.openstreetmap.org/listinfo/talk-gb >
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