Spatial distribution of emissions to air - the SPREAD model

*HQHUDO PHWKRGRORJ\
The distribution of emissions in the Danish emission inventory is carried
out in databases and in the geographical information system ArcGIS.
The methodology applied in the part of the distribution carried out in
GIS is shortly described in this chapter. The description is made for the
Industrial Processes sector as case, as this distribution is rather simple.
The emission inventory for Industrial Processes covers both point
sources and area sources. Emissions from point sources are allocated to
the coordinates given in the Danish emission system and are not relevant
in relation to the GIS procedure. Emissions from area sources are calculated
from production statistics and the resulting emissions are national
totals as allocation of the sources (industrial plants) is not possible with
the present data foundation. Instead a proxy for the distribution is applied,
in this case the location of industrial areas as given in KORT 10 by
the National Survey and Cadastre (Figure 2.1). The GIS map of industrial
areas is not reflecting differences in the location for different industries,
but only holds industrial buildings (referred to as the industrial area as
the buildings are treated as areas rather than units). The map is a shape
file and the industrial areas are polygons.
Figure 2.1 Segment around Avedøre of the map of industrial areas.
As SPREAD gives emissions on 1x1 km the map of industrial areas must
be combined with the Danish 1x1 km Grid Net. The grid is an orthogonal
coordinate system where the cells are defined and named by their lower
left corner coordinates, e.g. 1km_6 495_735 where 1km refers to the cell
size, 6 495 refers to the Y coordinate of the grid cell (Y = 6 495 000 m) and
375 refers to the X coordinate (X = 375 000 m). The grid net map is a
shape file and the grid cells are polygons (Figure 2.2).
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