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apps:gis4envi-met [2022/06/20 14:08] – [Configuration] enviadmin | apps:gis4envi-met [2022/07/08 12:04] – 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 | ||
Line 30: | Line 30: | ||
* 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 '' |
- | ===== Configuration | + | ===== Documentation |
- | To use the plugin, first ensure that your geodata | + | To use the plugin, first ensure that your geodata |
* All layers should be projected in the same map projection system (preferably UTM) | * All layers should be projected in the same map projection system (preferably UTM) | ||
* Layers should hold fields with ENVI-met database IDs where necessary | * Layers should hold fields with ENVI-met database IDs where necessary | ||
+ | ==== 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 plugin automatically searches through all currently opened layers and provides all suitable layer types in the layer drop down menus in the various tabs. | ||
+ | |||
+ | The following layer types are expected: | ||
+ | |||
+ | * " | ||
+ | * " | ||
+ | * " | ||
+ | * "3D plants: vector data -> point" | ||
+ | * "DEM: raster data" | ||
+ | * " | ||
+ | * " | ||
+ | |||
+ | ==== 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" | ||
+ | |||
+ | Most of the fields expect an " | ||
+ | |||
+ | |||
+ | ==== 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: | ||
+ | |||
+ | {{: | ||
+ | |||
+ | 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. | ||
+ | |||
+ | 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: | ||
+ | * Splitting: 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 | ||
+ | * Telescoping: | ||
+ | |||
+ | 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. | ||
+ | |||
+ | 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 == | ||
+ | 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 highest structures (DEM+ Buildings) | ||
- | * Lateral boundary should be clear of stuctures roughly half the height of the adjacent buildings (see Additional Gridding options) | ||
- | ===== Documentation ===== | ||
- | Install the **latest version** of QGIS. You can find and install the " | ||
- | '' | + | * Lateral boundary should be clear of structures roughly half the height of the adjacent buildings (see Additional Gridding options) |
- | {{ : | ||