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general:gridded_data:start [2022/12/16 13:13] – [Chapter 10.2 - Gridded Data] doeringgeneral:gridded_data:start [2024/11/06 14:56] (current) – external edit 127.0.0.1
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 The spatial distribution of the emissions that are not distributed to point sources or line sources, is carried out in two steps on area sources. In the first step, these emissions are distributed by means of suitable distribution parameters to the district level.In the second step a more accurate spatial allocation of emissions using land cover data is carried out within the districts. Per NFR sector the areas of the relevant land use classes are chosen and only to these areas emissions are allocated. Here, emphasis can also be placed on different CLC groups, e. g. the land-cover class ‘residential areas’ could get a higher rating than land-cover class ‘residential areas loose’. As a result, the previously at district level distributed national emissions are now spatially localized to the relevant land-cover areas within the districts.Aim of the spatial distribution of emissions is the compilation of emissions in a defined grid. For this, the emissions, spatially distributed to individual point, line and area sources, are assigned to the grid cells of the selected grid in a further step. After determination of the coordinate reference system and grid size of the raster, the share of each emission source (point / line / area source) per grid cell is determined. The summation of the emissions of all source shares lying within a grid cell leads to the total of emissions of the grid cell. The spatial distribution of emissions is not only limited to horizontal distribution,  but also includes distribution to vertical height levels. Therefore, it was necessary to assign to each source category or to each NFR sector an average characteristic emission height above ground.  The spatial distribution of the emissions that are not distributed to point sources or line sources, is carried out in two steps on area sources. In the first step, these emissions are distributed by means of suitable distribution parameters to the district level.In the second step a more accurate spatial allocation of emissions using land cover data is carried out within the districts. Per NFR sector the areas of the relevant land use classes are chosen and only to these areas emissions are allocated. Here, emphasis can also be placed on different CLC groups, e. g. the land-cover class ‘residential areas’ could get a higher rating than land-cover class ‘residential areas loose’. As a result, the previously at district level distributed national emissions are now spatially localized to the relevant land-cover areas within the districts.Aim of the spatial distribution of emissions is the compilation of emissions in a defined grid. For this, the emissions, spatially distributed to individual point, line and area sources, are assigned to the grid cells of the selected grid in a further step. After determination of the coordinate reference system and grid size of the raster, the share of each emission source (point / line / area source) per grid cell is determined. The summation of the emissions of all source shares lying within a grid cell leads to the total of emissions of the grid cell. The spatial distribution of emissions is not only limited to horizontal distribution,  but also includes distribution to vertical height levels. Therefore, it was necessary to assign to each source category or to each NFR sector an average characteristic emission height above ground. 
  
-Table 1: Description of the distribution parameters,  +Table 1: Description of the distribution parameters, refer to {{ :general:gridded_data:greta_nfr_verteilparameter_20240911.xlsx |}} 
-{{ :general:gridded_data:greta_nfr_verteilparameter_202111104_out.xlsx |}}+ 
 +Further and more recent Greta improvements are described in additional reports (German): {{ :general:gridded_data:2019_01_14_doku_greta_erweiterung2018_190114.pdf |[1]}}, {{ :general:gridded_data:2021_05_17_doku_greta_erweiterung_210517.pdf |[2]}} and {{ :general:gridded_data:2024_06_20_doku_greta_weiterentwicklung_2023_2024.pdf |[3]}}
  
 ===== Distribution Parameters ===== ===== Distribution Parameters =====