[h4]How to read the maps on Londonmapper[/h4]
[dropcap1]L[/dropcap1]ondonmapper uses cartograms to visualise the social dimensions that shape the city. There are various different types of maps that we use for showing different aspects of the data depending on the level of detail and the main focus of what we look at. These are the main types of maps that we use in the project and which you will find throughout the map section. The buttons correspond to the buttons shown on each map page where different versions of a map topic is available.
The reference map button brings you to a population cartogram and a conventional land area map which allow you to compare the map shapes to the population distribution and a ‘normal’ view of London. The reference map also contains labels for the boroughs which have been removed in the other maps on this website to not obstruct the actual map image. Once you are familiar with the colours for each borough, you will be able to read the other cartograms much easier.
The borough maps are cartograms that resize the boroughs of London according to the topic of the map. These are based one single number for each borough, thus are the maps which provide the most general overview of how London is structured. These maps use the Londonmapper colour scheme shown in the map above allowing the boroughs to be identified in the map image.
Grid maps are based on a gridded cartogram transformation of a certain topic. These provide the most detailed cartogram perspective of a topic because they show each individual grid cell in the map resized according to the information that is displayed in the map. The larger a grid cell, the higher is its corresponding data so that the dominating areas of a certain topic are shown as the largest areas in the map. Grid maps use the Londonmapper colour scheme shown in the map above allowing the boroughs to be identified in the map image.
The gridded population cartogram shown above is the basis for the ward maps. Each ward map therefore shows London in its population shape, meaning that the least populated areas disappear from the map, while the most densely populated parts of the city are the largest areas in this map. The ward maps include an additional choropleth layer showing additional information in relation to the population distribution. A legend in each map explains, what information the colours in the map show.
Rank maps are an alternative map display of the Borough- and Grid maps. They provide additional statistical detail, while at the same time are more abstract with their yellow-green-blue shadings. These visualise how the particular topic is distributed in relation to relative shares across the city. The colours show the areas ordered by their particular shares so that unusual patterns in the distribution of the data become visible (going from yellow for the lowest via green to blue for the highest shares).
All maps are provided in three different file formats ad sizes. On the actual map page you see a small size version of the map. By clicking at it or selecting the Zoom button you will view a larger size version of the map overlaid on the webpage, which can be closed again by clicking outside the map or using the X button. Each map can also be downloaded in a high-resolution version as a 300 dpi RGB tif file (TIF button) and a 300 dpi greyscale file (Grey button), which can be used for printing our other design purposes. The maps may be used free of charge for non-commercial purposes under a Creative Commons license (CC BY-NC-ND 3.0 – Attribution-NonCommercial-NoDerivs 3.0 Unported). Any commercial use requires a permission (see contact details here).