#List of movies that used massive crowd simulation code
P.S If you need an easy way to format source code within blogger, you can find a link to a good source code formatter here. An example set up code can be found here, and I will repeat it below for the latest version:įWTOOLS_DIR='C:\Program Files (x86)\FWTools2.4.7' Whilst we are on the topic of setting up environments within Matlab, a quick mention that FWTools can also be set up and used within Matlab in a similar way. I am also using QGis functions instead of FWTools functions now, as QGis has a later version of 'gdal_rasterize' that I needed. Similarly, this process can be used for any QGis function within Matlab once the environment is setup. I can now edit the 'img' data matrix if necessary, and write it out using Matlab's own 'geotiffwrite' function, that would retain the geographical metadata. % Call the QGis Tools Environment setup script for this sessionĮval() % referencing object into R, and the geotiff info into infoįunction = rasteriseShp(layer, input, output) % The function also optionally reads the image data into img, the spatial
% The GET attribute is specified in the scenario specification work flow % It outputs a GeoTiff file using the GET attribute set in the shape file % This function takes a layer and shape file as input Here, the user input for 'layer', 'input' and 'output' is passed onto the QGis 'gdal_rasterize' function. In order to convert the user input into a Matlab expression that is passed to QGis, we can use the 'eval' function of Matlab
We may also want to pass user input to the QGis functions. Write a Matlab script to use QGis functionsĪfter setting up the QGis environment, we can now call the QGis functions from within Matlab. Now, any QGis functions can be called using Matlab's symbol for calling system functions ('!'). QGISTOOLS_DIR='C:\Program Files\QGIS 2.18' A simple way to do this is to write a script to first set up the QGis environment within Matlab, as follows: On the other hand, Matlab already has a GeoTiff reader and writer that we can use to edit the GeoTiff file if required after converting the Shape file to GeoTiff. Therefore, it would then require me to use the FWTools method, as described above. Python scripts can be written within QGis to streamline the process, however, it's not possible to edit the GeoTiff file within QGis. Underneath the hood, QGis uses the Gdal library. Set up the QGis environment within Matlab This process becomes pretty tedious over time. Once edited, copy the metadata to the edited tiff file:Ĭ:\> geotifcp -g metadata.geo edited.tif output.tif For completeness, here is what needs to be done, within the FWTools shell.Ĭ:\> listgeo -no_norm original.tif > metadata.geo A tool such as FWTools is needed in order to extract the geographical metadata before editing, and then appending it to the edited Tiff file. This can be done in Photoshop, however, Photoshop doesn't save the geodata from the GeoTiff file. Sometimes, the conversion from vector to raster is not as desired, where some pixel values are a pixel out from where they should be, and therefore, requires some editing. The GeoTiff files are obtained by rasterising the shape files using the 'rasterize' tool within QGis. In that regard, I create scenarios for my crowd application that take in Shape files and rasterised GeoTiff files to specify a scenario. It's always really useful to streamline your workflow, so that the processes can be seamless and efficient.
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