npemap-talk

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19 discussions

Re: [npemap-talk] Postcode distribution plotter
by Russ Phillips 22 Jul '08

22 Jul '08

Quoting "Gavin Jamie" <gjamie(a)doctors.org.uk>: > Sorry. Error at the brain-finger interface > > feed.gpcontract.co.uk/cgi-bin/mapper.pl That is rather nice. I have a kind-of similar thing at: http://www.phillipsuk.org/osm/postcode.php Although mine is more geared up to searching for postcodes. Russ ---------------------------------------------------------------- This message was sent using IMP, the Internet Messaging Program.

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Postcode distribution plotter
by Gavin Jamie 22 Jul '08

22 Jul '08

Hi I posted a couple of months ago about the geocoder. Time ran away and I have at last got my (tiny) app together. The original version involved php, sed, sort, uniq and a web service. It was all starting to look a bit insane so I have learnt a little perl and changed the geocoder to work as a perl import (I would say module but it is a bit too lashed together for that). The reason behind all this is that I am a GP with about 9000 patients. We are thinking of a new surgery building (well they are going to bulldoze the current one!) and it was useful to know where our patients live when locating a new building. The postcodes are grouped by sector and a kml file generated. This is very basic at the moment. It is optimised for working in a smallish area. It would be nice to have drill down (group at the SN , SN1 , SN1 0 levels) and mash up extra data (e.g. census information). However it may be useful to other small business. Spit and polish (e.g. a stylesheet! - custom icons showing % in the kml etc etc) to follow. Probably slowly. http://feed.gpcontract.co.uk/mapper.pl Many thanks for all your work without which none of this would be possible. -- Gavin Jamie This message has been scanned for viruses by BlackSpider MailControl - www.blackspider.com

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Bulk geocoding requests
by Gavin Jamie 31 May '08

31 May '08

Hi I have been doing a little project for my work where get a list of several thousand postcodes, count up the number in each sector, geocode the sectors and display the totals on a google map. We only have local addresses so are using less than 20 sectors. The geocoder on npemap.org.uk is very fast and this is easy. I am thinking of making this a website open to all (FOSS etc etc). Clearly there is some scope for quite a lot of geocoder load and a web api may not be suitable any more - and the load on this server may become a bit too high in short bursts. Is the geocoder available to download, and if so are there any hints for converting a fastcgi to daemon? Many thanks Gavin

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Re porting bad post codes
by tipichris 16 Apr '08

16 Apr '08

I've just reported a handful of bad postcodes, but the process wasn't easy. I found a whole cluster of CV1 codes, all close together but all miles out, somewhere near Kidderminster. The problem was that it was very difficult to keep track of which ones I'd reported and which ones I hadn't. I've almost certainly missed some, and probably reported some twice. It would be nice if codes that have been reported showed in a nice warning yellow or something. -- View this message in context: http://www.nabble.com/Reporting-bad-post-codes-tp16718467p16718467.html Sent from the NPEmap - Talk mailing list archive at Nabble.com.

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Postcodes outside normal distribution removed
by Grant Slater 13 Mar '08

13 Mar '08

NPEMap'ers A few hundred incorrect "outliers" postcodes have been removed over the last few weeks, improving npemap's accuracy. OX1 and OX2 are now found in Oxford. ;-) My next step is likely outbound validation. Randomjunk's postcode map has also recently been updated: http://dev.openstreetmap.org/~random/postcodes/ / Grant

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Marking / flagging incorrect entries
by russellallen 15 Dec '07

15 Dec '07

Hi all, I've recently found myself doing the same exercise as another poster on this thread to find potentially bogus entries - averaging postcodes per region and finding ones that are significantly outside where they belong. This raises a question though, let's say I believe these codes are suspect and so does everyone else (indeed I've checked one or two on other websites which use more "official" postcode data), should these codes be removed or at least marked somehow as bogus? If I'm going to use this data in a project of my own I could remove these entries having manually checked them, but then the data correction isn't being done in a shared way along with the data collection. What's the best way of setting a feedback mechanism like this up? If necessary I don't mind helping out? Russ -- View this message in context: http://www.nabble.com/Marking---flagging-incorrect-entries-tp14233507s26798… Sent from the NPEmap - Talk mailing list archive at Nabble.com.

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Std Dev - Finding Incorrect Entries
by Grant Slater 04 Dec '07

04 Dec '07

npemap, I have compiled a list of entries which vary greatly from their outbound's standard deviation: (worst entries at the top) http://code.firefishy.com/files/bad-postcodes.csv I am no statistician. Please correct me if I am off the mark. / Grant ------------------------ SQL: SELECT `postcodes`.`outward`, `postcodes`.`inward`, `postcodes`.`lat`, `postcodes`.`long`,`outbound_stats`.*, abs(`postcodes`.`lat`-`outbound_stats`.`lat_avg`) AS `lat_offset`, abs(`postcodes`.`long`-`outbound_stats`.`long_avg`) AS `long_offset` FROM `postcodes` LEFT JOIN `outbound_stats` ON `postcodes`.`outward` = `outbound_stats`.`outward` WHERE `outbound_stats`.`number` >= 10 AND ( (abs(`postcodes`.`lat`-`outbound_stats`.`lat_avg`) + abs(`postcodes`.`long`-`outbound_stats`.`long_avg`)) > (`outbound_stats`.`lat_stddev`*3 + `outbound_stats`.`long_stddev`*3 )) ORDER BY (`lat_offset`+`lat_offset`) DESC

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checking for bad postcodes
by markdc 03 Dec '07

03 Dec '07

You may have noted a spate of bad code reports north of Brighton from me last evening. As a new postcode mapper of - oh, about 3 minutes - I've been checking the data by using the postcode map at free the postcode: http://dev.openstreetmap.org/~random/postcodes/ This uses the npe codes as well as free the postcode codes to produce a postcode map at, for exapmle, BN1 level. Bad codes show as unlikely or even crazy post code zones on the map. For example, islands of BN1 in BN5 zones and even of SP1 in BN. These seem to be bad postcodes on the NPEmap and I've reported them. Probably a well known method but useful. let me know if there is anything I can do. Best wishes Mark -- View this message in context: http://www.nabble.com/checking-for-bad-postcodes-tf4930997s26798.html#a1411… Sent from the NPEmap - Talk mailing list archive at Nabble.com.

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Welcome
by Dominic Hargreaves 16 Sep '07

16 Sep '07

Welcome to the new mailing list and forum for the npemap project - we hope it will be an effective way for people to discuss their experiences with the site. Cheers, Dominic. -- Dominic Hargreaves | http://www.larted.org.uk/~dom/ PGP key 5178E2A5 from the.earth.li (keyserver,web,email)

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