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apps:gis4envi-met [2022/06/22 10:47] – [Gridding options] enviadmin | apps:gis4envi-met [2023/04/26 07:53] (current) – [Geodata to ENVI-met] enviadmin | ||
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- | ====== | + | ====== |
- | Geodata to ENVI-met is a plugin for the free and open source geographic information system QGIS ([[https:// | + | This plugin |
- | This plugin | + | |
If you are familiar with QGIS or GIS software in general as well as ENVI-met, the plugin will be easy to use. Simply follow the prerequisites on the Welcome page of the plugin. | If you are familiar with QGIS or GIS software in general as well as ENVI-met, the plugin will be easy to use. Simply follow the prerequisites on the Welcome page of the plugin. | ||
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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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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: | 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: | ||
+ | {{: | ||
- | + | 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 of the polygon defines the lower x-axis of the ENVI-met model area. | |
- | 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. | + | |
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. | 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. | ||
The third Gridding setting is the vertical resolution of the model area. The user can set a vertical (z) resolution and the number of z-Grids for the resulting model area. Furthermore two methods of vertical gridding can be set: | The third Gridding setting is the vertical resolution of the model area. The user can set a vertical (z) resolution and the number of z-Grids for the resulting model area. Furthermore two methods of vertical gridding can be set: | ||
- | * The lowest gridbox can be split into 5 subcells. This results in more detailed model outputs for the area close to the surface. Please note, that if DEM / Terrain is used, only the lowest gridbox features the higher accuracy of split subcells | + | * Splitting: |
- | * Telescoping is a feature that enables | + | * 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), |
- | Since ENVI-met model areas need to be gridded in a defined resolution | + | To ensure high accuracy close to the surface, the telescoping start height can be set a certain heights (well above pedestrian level) and the telescoping option can be combined with splitting. Both, the resulting vertical grid as well as the highest structures in the model area are shown in the memo next to the vertical gridding options. |
- | * Vertical | + | Please ensure, that the vertical |
- | * Lateral boundary should be clear of structures roughly half the height of the adjacent buildings (see Additional Gridding options) | + | |
- | ===== Tutorials | + | ===== Additional Gridding settings |
- | Install the **latest version** of QGIS. You can find and install | + | In the "[Additional Gridding settings]", |
- | '' | + | == 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. | ||
- | {{ :apps:qgis.gif? | + | == 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:// | ||