In MATLAB's Site Viewer, the 3D geometries of buildings are generated based on the data provided in the OpenStreetMap (OSM) file, but the geometries themselves are not directly accessible through the Site Viewer interface. However, you can extract the 3D geometries of buildings using the Mapping Toolbox in MATLAB. Here's a general approach:
1. Import the OSM file: Use the `shaperead` function from the Mapping Toolbox to import the OSM file and convert it into a geographic data structure.
data = shaperead('your_osm_file.osm');
2. Filter buildings: Iterate over the imported data and filter out the buildings based on the available attributes such as `<building>` or `<building:levels>`.
buildings = data(strcmp({data.highway},'building'));
3. Extract building footprints: Extract the 2D footprints of the buildings by accessing the coordinates of the building polygons.
footprints = vertcat(buildings(:).Lat, buildings(:).Lon);
4. Extract building heights: Extract the heights of the buildings from the available attributes such as `<height>` or `<building:levels>`.
heights = [buildings(:).height];
5. Generate 3D geometries: Use the footprints and heights to generate 3D geometries of the buildings using the extrusion operation.
extrudedGeometries = extrude(buildings(:).Lon, buildings(:).Lat, heights);
Now you have access to the 3D geometries of the buildings in MATLAB, which you can further utilize for ray tracing or propagation modeling purposes.
Note that the `extrude` function mentioned above is not a built-in function in MATLAB, but you can implement it using various approaches such as creating a custom function or utilizing existing functions/libraries like the Extrude Polygons from the MATLAB File Exchange.
Keep in mind that the accuracy and availability of the building heights may vary depending on the information provided in the OSM file. It's recommended to inspect and validate the data to ensure its suitability for your specific use case.
Hope this helps!
