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28-Jan-2016 21:29

While it may seem straightforward to use the postal service file for this purpose, this can be out of date and some dwellings may contain a number of independent households.

A particular problem is what are termed 'communal establishments' which category includes student residences, religious orders, homes for the elderly, people in prisons etc.

Depending on the mode of enumeration, a form is sent to the householder, an enumerator calls, or administrative records for the dwelling are accessed.

As a preliminary to the dispatch of forms, census workers will check any address problems on the ground.

An important aspect of census enumerations is determining which individuals can be counted from which cannot be counted.

Broadly, three definitions can be used: de facto residence; de jure residence; and, permanent residence.

Modern census data are commonly used for research, business marketing, and planning, and as a baseline for designing sample surveys by providing a sampling frame such as an address register.

A pair of developers from London used open source data to build an interactive 3D map of the tube network, complete with moving trains, pictured.

The visualisation was built to showcase the Vizi Cities project.

As these are not easily enumerated by a single householder, they are often treated differently and visited by special teams of census workers to ensure they are classified appropriately.

Individuals are normally counted within households and information is typically collected about the household structure and the housing.Its creators have made the code behind the project available for anyone to use To try and capture the unique sounds of the London Underground, archivist Ian Rawes has created the London Sound Survey - an online collection of field recordings, sound maps, early BBC radio actuality and more.'Trying to understand how the entire London Underground network works would be a headache for anyone, let alone Tf L, but seeing it all happen before your eyes in an interactive 3D experience allows you to step back and comprehend what’s happening.' Set up by developers Peter Smart and Robin Hawkes almost a year ago, Vizi Cities was designed 'to change the way you look at cities and the data contained within them.' Cities are created using Open Street Map data and powered by Java Script and Web GL The data can be taken from any open source information, including Transport for London, but also traffic agencies, social networks and more.