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104 S. Siedentop and S. Fina
Annex 1. (Continued)
Source Area statistics
Software ArcGIS 9.2
Implementation (1) Calculate the difference between urban area 2004 and urban area 1996 for each
municipality
(2) Intersect municipalities with 10 · 10 km grid
(3) Apportion the result to new polygons where municipalities have been split,
based on the ratio of new size of split polygon/size of original polygon
(4) Summarise the new urban area statistic for all polygons within a cell
Formula
P NUAt t1
with
NUA: New urban area
t, t 1: Reference years
Definitions Urban area: aggregate measure for residential, commercial, industrial
land and land in transportation infrastructure (= ‘Siedlungs- und
Verkehrsfläche’)
New urban area: difference between urban areas of
two base years
References European Environment Agency (2006)