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News

Geoinformation from space sharpens population density maps

European Space Agency : 03 November, 2006  (Technical Article)
In response to a growing demand for sharpened census data, GeoVille Information Systems has developed
GeoVille, an Austrian company specialising in geo-information, and Tele Atlas, a leading provider of road networks worldwide, are providing detailed models of areas based on road network information, statistical population data, supplied by the German-based market research institute GfK, and Earth observation images from ESA’s Envisat, NASA’s LANDSAT and the French Space Agency’s SPOT satellites.

Results are then integrated into Tele Atlas’ digital geographic database, MultiNet, and can, among other applications, be used to spot the target groups for geomarketing campaigns.

Envisat
Geomarketing determines consumer profiles according to geographical zones based on market-specific data by using geographical information along with population and economic statistics. Companies can use this information to visualize the geographic location of potential target groups before implementing costly marketing campaigns and to envision future growth on a local or national scale. For instance, this information can be used to strategically choose a heavily-populated area in which to place a business in another country without ever placing a foot in the region.

Population data from zip codes has been used for decades to help companies reach their target audience, but that data has drawbacks because it standardises the information, conveying the erroneous impression of homogeneous population densities leading to misleading results. Data provided by EO-STAT (EO derived information for sharpening socio-economic STATistics) makes the transition from the current population statistics to the ‘real-world’ population situation.

'Models based on zip code data, for example, make areas look uniform, but in reality within a community you will have, for instance, some high rise buildings, single family homes, some green areas, lakes and parks,' Christian Hoffman of GeoVille said. 'Our service is like a pencil sharpener because it sharpens the data already available by using a model that compiles three layers of information.'

Data development for density maps
Information on ‘real-world population’ distribution is already available through EO-STAT for all of Austria with extensions in Germany, but the largest potential of the project is in regions and countries where limited information on population distribution is available. Thus, EO-STAT is currently working to provide models for Eastern European countries, where the statistical data are sometimes fragmented not homogeneous. In light of the European Union’s expansion to the east, there is an increasing demand for geoinformation from this region to allow local and national businesses to make better informed decisions. GeoVille is also currently providing maps over the province of Shanghai in China.

GeoVille first employed this technique in Vienna, Austria, with a population of roughly 1.5 million, and illustrated a complex and heterogeneous settlement structure from low density single family neighbourhoods to modern high-rise buildings and large industrial and commercial areas.

The model produced was validated with aerial photographs and independent reference data and showed an accuracy of more than 95 percent. The EO data used provided recognition of urban features and separation of urban from non-urban features, as well as discrimination of urban site density based on the presence of vegetation.

Companies currently using this model expect to improve their existing data sets in regards of accuracy by a factor of 100 or more.

The EO-STAT service is organised in partnership with German-based Infoterra GmbH and Brockmann Consult. The EO-STAT contract was awarded by ESA within the framework of the Earth Observation Market Development programme. More information about EO-STAT activities is available from the EOMD website or can be obtained by contacting eomd@esa.int.
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