Hello all, I am trying to read vector GeoPackage files in order to render a custom map suitable to display on a 3bpp e-ink screen (8 grayscales per pixel). I am a complete noob in anything related to GIS and mapping and all terminology, but I have managed to use GDALRasterizeLayers to burn (almost) all features of the vector layers into a raster GTiff. However, I have no idea how or if I can apply any sort of styling while using this procedure.
Using GDALRasterizeLayers I get an image containing all the different features on the map as specific pixel values, which I could color differently as a post process, but I can not change _how_ the features are renderad in the first place (different brush, stroke width etc). I have tried using OGRFeature::SetStyleString() on the source layers, but it does not seem to have any effect. Using QGIS I can read the GeoPackages together with a .qlr file to get a map that looks as it originally should, and from there I can "Export map to image" and generate XYZ tiles (I haven't gotten these to look exactly correct though), but I would primarily like to find a way to programmatically render tiles on the fly directly to my custom screen. Am I using the correct approach for creating a bitmap image from vector, or is rasterize meant for other use cases? It seems most examples focus on data processing rather than map rendering. I am unfamiliar with the terminology so I worry I might be going the wrong direction entirely when searching for the solution. Best Regard, Martin Häggström
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