This feature is still experimental, but at the moment it handles point data in lat/lon coordinates (WGS84) or OS coordinates for the UK (OSGB36). Point data can be drawn using markers, or as a heatmap showing point density. For area data, one column in the data is selected as a key field and this is joined with the geographic data stored in MapTube’s database to draw the map. For example, using the following data:
We have four columns: Constituency, Party, PartyCode and Change. In the CSV file the first line must be the column headings, then every subsequent line contains data. The CSV file would contain the following:
Constituency,Party,PartyCode,Change Aberavon,LAB,1,LAB Hold Aberconwy,CON,2,CON Gain etc...
The “Constituency” column is the area key in this case, but MapTube determines this automatically when the CSV file is loaded, along with the type of geography, which is Parliamentary Constituencies. In order to colour the map, numeric data is required, so in this example, a column labelled “PartyCode” has been added where “LAB”=1, “”CON”=2, LD=”3″ etc.
The colour scale is then chosen and the finished map submitted to MapTube where it can be viewed along with any of the other maps. There are help pages accessible through the ‘i’ icon on each section which contain further information.
As mentioned before, this feature is still experimental and we will be gradually adding more geographic data to the MapTube database to allow maps to be built from additional geographies. The aim is for MapTube to be able to automatically detect the geography just by analysing the data and, at the moment, the following geographies can be used:
Government Office Regions (UK) (GOR) Lower level super output areas (UK) (LSOA) Medium level super output areas (UK) (MSOA) Output Areas (UK) (OA) Postcode Districts (UK) (PostcodeDistricts) County and Unitary Authority (UK) (CountyUA and ONSCountyUA) Districts (UK) (Districts and ONSDistricts) Census Area Wards (UK) (CASWards) World Borders 2010 (WorldBorders2010ISO2 and ISO3 using the ISO country codes) Parliamentary Constituencies 2010 (UK) (PCON2010)
US States and Zip code areas will be added shortly, along with administrative and Census boundaries for other parts of the World.The underlying technology is used on the SurveyMapper site and for other real-time visualisations like http://bigdatatoolkit.org/2011/07/26/1yeartogo/ which shows tweets using the #1yeartogo hashtag for the London 2012 Olympics.
We aim to enhance this further over the coming months as MapTube is at the heart of GEMMA (Geographical Engine for Mass Mapping Applications), its an interesting step forward in rapid visualisation from data portals. Thanks as ever go to Richard for his work on MapTube and its every increasing number of users.