Archive for the ‘planning’ Category
This post is by Andrew Speakman, who’s coordinating OpenlyLocal’s planning application work.
As Chris wrote in his last post announcing OpenlyLocal’s progress in building an open database of planning applications, while we can do the importing from the main planning systems, if we’re really going to cover the whole country, we’re going to need the community’s help. I’m going to be coordinating this effort and so I thought it would be useful to explain how we’re going to do this (you can contact me at firstname.lastname@example.org).
First, we’re going to use the excellent ScraperWiki as the main platform for writing external scrapers. It supports Python, Ruby and PHP, and has worked well for similar schemes. It also means the scraper is openly available and we can see it in action. We will then use the Scraperwiki API to upload the data regularly into OpenlyLocal.
Second, we’re going to break the job into manageable chunks by focus on target groups of councils, and just to sweeten things – as if building a national open database of planning applications wasn’t enough ;-) – we’re going to offer small bounties (£75) for successful scrapers for these councils.
We have some particular requirements designed to make the system maintainable, and do things the right way, but not many are fixed in stone, so feel free to respond with suggestions if you want to do it in a different way.
For example, the scraper should keep itself current (running on a daily basis), but also behave nicely (not putting an excessive load on Scraperwiki or the target website by trying to get too much data in one go). In addition we propose that the scrapers should operate by updating current applications on a daily basis and also make inroads into the backlog by gathering a batch of previous applications.
- Create new database records for any new applications that have appeared on the site since the last run and store the identifiers (uid and url).
- Create new database records of a batch of missing older applications and store the identifiers (uid and url). Currently the scrapers are set up to work backwards from the earliest stored application towards a target date in the past
- Update the most current applications by collecting and saving the full application details. At the moment the scrapers update the details of all applications from the past 60 days.
- Update the full application details of a batch of older applications where the uid and url has been collected (as above) but the application details are missing. At the moment the scrapers work backwards from the earliest “empty” application towards a target date in the past
The data fields to be gathered for each planning application are defined in this shared Google spreadsheet. Not all the fields will be available on every site, but we want all those that are there.
Note the following:
- The minimal valid set of fields for an application is: ‘uid’, ‘description’, ‘address’, ‘start_date’ and ‘date_scraped’
- The ‘uid’ is the database primary key field
- All dates (except date_scraped) should be stored in ISO8601 format
- The ‘start_date’ field is set to the earliest of the ‘date_received’ or ‘date_validated’ fields, depending on which is available
- The ‘date_scraped’ field is a date/time (RFC3339) set to the current time when the full application details are updated. It should be indexed.
So how do you get started? Here’s a list of 10 non-standard authorities that you can choose from. Aberdeen, Aberdeenshire, Ashfield, Bath, Calderdale, Carmarthenshire, Consett, Crawley, Elmbridge, Flintshire. Have a look at the sites and then let me know if you want to reserve one and how long you think it will take to write your scraper.
Well, that took a little longer than planned…
[I won’t go into the details, but suffice to say our internal deadline got squeezed between the combination of a fast-growing website, the usual issues of large datasets, and that tricky business of finding and managing coders who can program in Ruby, get data, and be really good at scraping tricky websites.]
But I’m pleased to say we’ve now well on our way to not just resurrecting PlanningAlerts in a sustainable, scalable way but a whole lot more too.
Where we’re heading: a open database of UK planning applications
First, let’s talk about the end goal. From the beginning, while we wanted to get PlanningAlerts working again – the simplicity of being able to put in your postcode and email address and get alerts about nearby planning applications is both useful and compelling – we also knew that if the service was going to be sustainable, and serve the needs of the wider community we’d need to do a whole lot more.
Particularly with the significant changes in the planning laws and regulations that are being brought in over the next few years, it’s important that everybody – individuals, community groups, NGOs, other websites, even councils – have good and open access to not just the planning applications in their area, but in the surrounding areas too.
In short, we wanted to create the UK’s first open database of planning applications, free for reuse by all.
That meant not just finding when there was a planning application, and where (though that’s really useful), but also capturing all the other data too, and also keep that information updated as the planning application went through the various stages (the original PlanningAlerts just scraped the information once, when it was found on the website, and even then pretty much just got the address and the description).
Of course, were local authorities to publish the information as open data, for example through an API, this would be easy. As it is, with a couple of exceptions, it means an awful lot of scraping, and some pretty clever scraping too, not to mention upgrading the servers and making OpenlyLocal more scalable.
Where we’ve got to
Still, we’ve pretty much overcome these issues and now have hundreds of scrapers working, pulling the information into OpenlyLocal from well over a hundred councils, and now have well over half a million planning applications in there.
There are still some things to be sorted out – some of the council websites seem to shut down for a few hours overnight, meaning they appear to be broken when we visit them, others change URLs without redirecting to the new ones, and still others are just, well, flaky. But we’ve now got to a stage where we can start opening up the data we have, for people to play around with, find issues with, and start to use.
For a start, each planning application has its own permanent URL, and the information is also available as JSON or XML:
There’s also a page for each council, showing the latest planning applications, and the information here is available via the API too:
There’s also a GeoRSS feed for each council too allowing you to keep up to date with the latest planning applications for your council. It also means you can easily create maps or widgets for the council, showing the latest applications of the council.
Finally, Andrew Speakman, who’d coincidentally been doing some great stuff in this area, has joined the team as Planning editor, to help coordinate efforts and liaise with the community (more on this below).
The next main task is to reinstate the original PlanningAlert functionality. That’s our focus now, and we’re about halfway there (and aiming to get the first alerts going out in the next 2-3 weeks).
We’ve also got several more councils and planning application systems to add, and this should bring the number of councils we’ve got on the system to between 150 and 200. This will be an ongoing process, over the next couple of months. There’ll also be some much-overdue design work on OpenlyLocal so that the increased amount of information on there is presented to the user in a more intuitive way – please feel free to contact us if you’re a UX person/designer and want to help out.
We also need to improve the database backend. We’ve been using MySQL exclusively since the start, but MySQL isn’t great at spatial (i.e. geographic) searches, restricting the sort of functionality we can offer. We expect to sort this in a month or so, probably moving to PostGIS, and after that we can start to add more features, finer grained searches, and start to look at making the whole thing sustainable by offering premium services.
We’ll be working too on liaising with councils who want to offer their applications via an API – as the ever pioneering Lichfield council already does – or a nightly data dump. This not only does the right thing in opening up data for all to use, but also means we don’t have to scrape their websites. Lichfield, for example, uses the Idox system, and the web interface for this (which is what you see when you look at a planning application on Lichfield’s website) spreads the application details over 8 different web pages, but the API makes this available on a single URL, reducing the work the server has to do.
Finally, we’re going to be announcing a bounty scheme for the scraper/developer community to write scrapers for those areas that don’t use one of the standard systems. Andrew will be coordinating this, and will be blogging about this sometime in the next week or so (and you can contact him at planning at openlylocal dot com). We’ll also be tweeting progress at @planningalert.
Thanks for your patience.