The Spatial Miscellany

A Christmas stuffing for the OS, a cold Turkey, or a Christmas Cracker?

The consultation paper on the Government’s proposal to open up Ordnance Survey’s data relating to electoral and local authority boundaries, postcode areas and mid scale mapping information has just been published:

Policy options for geographic information from Ordnance Survey

One thing that often frustrates me when working with a map is the absence of meaningful neighbourhoods. For example, try finding ‘Marchmont’ in Edinburgh, Scotland using Google Maps. You might find ‘Marchmont Road’ but that only gives an indication as to the area that the people of Edinburgh consider to be ‘Marchmont’ the neighbourhood.

A novel approach has been taken to resolve this and similar problems using Flickr’s 90 million geotagged photographs: The Shape of Alpha.

A handy demonstration of the API has been developed by Tom Talyor. A good example of the power of crowd sourced datasets.

Last month Google released a web browser…Google Chrome. It appears to have debuted to mixed reviews, personally I really like it, but others have had less favourable experience. On the surface, it looks much like any other web browser, but underneath, it’s a bit of an animal.

Google have acquired a new JavaScript engine (V8) written from the ground up to work more efficiently with websites that have large amounts of JavaScript rather than the little snippets of JavaScript which was typical of websites developed when JavaScript was first integrated into Netscape Navigator in the mid 1990s.

Typically JavaScript engines use a dictionary-like data structure as storage for object properties – each property access requires a dynamic lookup to resolve the property’s location in memory. V8 works differently…the first time V8 encounters an object it interprets how the object would be represented as a class, creating a hidden class, which means the next time the object is encountered, its properties can be accessed from memory without the time consuming dynamic look up.

Google give a far more comprehensive introduction to this approach in their documentation of V8, conveniently they use the example of an object common to all GIS developers…a Point.

So What?

The novel approach taken by the V8 JavaScript engine, presents a new opportunity for GIS web developers to work with Points, Lines and Polygons on the web client instead of the web server as is typical of a web based GIS. Using JavaScript in the web browser removes the need for lengthy round trips to the Server, which will make for faster web mapping applications.

Here and now, this will allow web mapping API developers to work with more markers, the typical 100 marker limit of Google Maps applications (and similar web mapping API’s) – is no more; Mike Williams and his team have reported working with as many as 2000 markers when using Google Maps within Chrome.

Chrome isn’t the only web browser to recognize the importance of working with JavaScript heavy web sites, for example, much work is being done on a new JavaScript engine for Firefox. Perhaps in the future, as this approach gains support, spatial analysis functionality can move from the server to the client, which would make for a more engaging web mapping experience?

If anyone is looking for a dissertation project, or has time of their hands, it would be interesting to see the outcome of taking some topological operators (e.g. Java Topology Suite), Google Web Toolkit (GWT) and GWT for Google Maps, all served up with Google Chrome?

Another rainy weekend proved a good excuse to sit down and put some theory into practice…

The theory goes…take a GPS enabled mobile phone; some beta software from Nokia; a handful of HTML, Javascript and PHP goodness; and you have all the components for a dynamic tracking web service and mapping website?

Well, the theory works! I’ve put a demonstration together at the following link:

Mobile Phone Tracking with a Nokia N95 Demonstration

Given all the current hype regarding some telecomunications technology; I’m puzzled by the apparent lack of interest in the mobile web server. Sure, there are a few pieces to still fall into place, but if the mobile web server’s graduation from Nokia research labs, results in widespread deployment, it must have a profound impact on the web?

…the Power Of Information taskforce is asking that question; and is prepared to stump up £20,000 to take your idea to the next level! The reasoning behind the competition is to get an understanding of the data and information the government needs to share to move things forward. To get the competition underway they’ve just released some new government datasets; for example, a list of all 22,000 schools.

Their website to harvest ideas (showusabetterway.co.uk) has been up for just over a day and seems to be getting a terrific response, I ran the ideas to date through Wordle to get a flavour of the requests being made, here are the results:

Congratulations to the POI taskforce; it’s a great step forward for the Free Our Data campaign. So if you’ve got ideas, get over there and jot them down. I’ve thrown my hat in the ring with the suggestion of a Road Works API…