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apps:gis4envi-met [2022/06/20 18:25] – [Documentation] enviadmin | apps:gis4envi-met [2022/10/20 14:00] – [Gridding settings] enviadmin | ||
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* horizontal and vertical dimensions of model domain | * horizontal and vertical dimensions of model domain | ||
- | * resolution of model domain | + | * spatial |
- | * buildings | + | * building structures |
- | * surfaces | + | * surface |
* simple vegetation such as grass as well as more complex vegetation such as trees | * simple vegetation such as grass as well as more complex vegetation such as trees | ||
* digital elevation models -> terrain | * digital elevation models -> terrain | ||
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* receptors | * receptors | ||
- | If ENVI-met is installed on your PC (only applies to Windows-Users) - you can use the '' | + | If ENVI-met is installed on your PC (only applies to Windows-Users) - you can use the '' |
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* Layers should hold fields with ENVI-met database IDs where necessary | * Layers should hold fields with ENVI-met database IDs where necessary | ||
- | In order | + | ==== Layers ==== |
The ENVI-met model area is a three-dimensional spaces that consists out of individual cuboids. These cuboids can be part of a building, a tree, a terrain etc. To export ENVI-met model areas, the user needs to specify which GIS-layers contain the different information (buildings, vegetation, etc.). | The ENVI-met model area is a three-dimensional spaces that consists out of individual cuboids. These cuboids can be part of a building, a tree, a terrain etc. To export ENVI-met model areas, the user needs to specify which GIS-layers contain the different information (buildings, vegetation, etc.). | ||
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* " | * " | ||
* " | * " | ||
+ | |||
+ | ==== Data fields ==== | ||
After selecting the layer to be used as an ENVI-met object, the plugin allows to specify fields that contain further information of the ENVI-met object. In case a layer of a particular ENVI-met object has been selected by the user, either a field layer needs to be specified or the checkbox "Use static value instead" | After selecting the layer to be used as an ENVI-met object, the plugin allows to specify fields that contain further information of the ENVI-met object. In case a layer of a particular ENVI-met object has been selected by the user, either a field layer needs to be specified or the checkbox "Use static value instead" | ||
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+ | ==== Gridding settings ==== | ||
+ | In the " | ||
+ | Since ENVI-met model areas use a Cartesian grid, it often makes sense to align the borders of a model area with the majority or the building outlines. See here: | ||
+ | {{: | ||
- | * Vertical extend of the model area should be roughly twice the height of | + | The sub area layer should be a polygon layer featuring a single rectangular polygon. This rectangular polygon is then used as the border for the ENVI-met model area. Please note, that the edge between the first and second vertex |
- | * Lateral boundary should be clear of structures roughly half the height | + | |
+ | After selecting the sub area layer, the user can set the horizontal resolution of the model area. The resulting number of grids is calculated on the fly. Typical horizontal resolutions range from 2 meters to 10 meters. Please note that smaller number of grids will result in a faster microclimate simulation. | ||
- | ===== Tutorials ===== | + | The third Gridding setting is the vertical resolution |
- | Install | + | * Splitting: The lowest gridbox can be split into 5 subcells. This results |
+ | * Telescoping: This is a feature that increasingly enlarges the vertical resolution of the vertical dimension of the cells. It allows to vertically extend the model area without too many additional vertical grid cell. This option should be used if the model area features tall objects (e.g. skyscrapers), | ||
- | '' | + | To ensure high accuracy close to the surface, the telescoping start height can be set a certain heights (well above pedestrian level) |
- | {{ :apps:qgis.gif? | + | Please ensure, that the vertical extend of the model area is roughly twice the height of the highest structures (DEM+ Buildings) and that the total height of the model area should not exceed 2500 meters. |
+ | |||
+ | |||
+ | ===== Additional Gridding settings ===== | ||
+ | In the " | ||
+ | |||
+ | == Default Roof / Wall Material == | ||
+ | Here, the user can define, which roof / wall materials shall be used for buildings. This field is only been read, if a building wall / roof material was not defined earlier in the Geodata section. | ||
+ | |||
+ | == Clear building cells close to the model border == | ||
+ | The lateral boundaries of the model area should be clear of structures roughly half the height of the adjacent buildings. This option will clear the lateral border cells from buildings. The user can define the number of cells that should be cleared from buildings | ||
+ | |||
+ | == Use leveled building heights for buildings in DEM == | ||
+ | Since roof heights of buildings are defined based on the local ground level, buildings, that are placed on a slope, or any kind of changing terrain level might show altering roof heights, that follow the terrain. This option ensures a level roof even when using DEM, by interpreting the building height from the lowest terrain height underneath a building. | ||
+ | |||
+ | == Start gridding of surfaces with == | ||
+ | This option might save considerable time of the digitization process. By defining a start surface type, first all surfaces are gridded with that ENVI_ID. Only areas where more information about the surface type is available from the " | ||
+ | |||
+ | == Remove vegetation from Buildings == | ||
+ | This option will remove all vegetation that might end up on top of building due to gridding. In case you want to use roof top greening, please consider the fields in the " | ||
+ | |||
+ | ===== Tutorials ===== | ||
+ | Coming up on our youtube channel: [[https:// | ||