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It should be easy to set up: in a slightly different - but actually similar - raster context, I had to do update-retiling for a bunch of GeoTIFFs that cover an entire city, with different sets of geoTIFFs at different ranges of zoom from 9 to 18. The GeoTIFFs also didn't 'fit' neatly into TMS/Google Maps tile numbers. Rather than re-tile the whole job (...


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Last I read the performance of ARCMap Desktop was less about video card. Everything I have read in FAQs has pointed to focus on CPU power not GPU. In fact GPU hardware Acceleration only benefits Raster Images and background maps.


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Signal can be emited by an object. Ex. your canvas: canvas = iface.mapCanvas() custom_canvas = QgsMapCanvas() # if you want to create new canvas instead of this from main window Canvas can emitt a signal renderComplete after rendering is complete, mapCanvasRefreshed after you refresh this canvas. So you can connect this signal to the proper function and ...


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I've only used the Graduated Symbol renderer; however, the categorized symbol marker seems to be quite similar. I was also seeking what you were and here was my solution: # replace QgsSymbolV2.defaultSymbol(layer.geometryType()) # with sym = QgsMarkerSymbolV2.createSimple({'name' : 'triangle', 'color' : 'red'}) 'triangle' in place of whatever marker you ...


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You can set the transparency for the raster value of 0 (Zero) to 100%. You can do that using layer properties -> transparency as you can see below: Then add values and write 0 For Red, Green and Blue colors and set the transparency to 100, which is the default. You also nee to the change the display of the RGB colors as follows: 1- Zoom to the target ...



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