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I think the best way to read in a raster for any purpose with Python/GDAL is by using a scanline and the unpack struct function. The code is more compact, the control is more effective and the execution time is faster than the one with 'ReadAsArray'. The scanline/struct method depends on fmttypes and their values can be supplied in a dictionary. In the next ...


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QGIS has all the algorithms necessary, but there is no GUI to create matrices yet. With some Python knowledge the Network Analysis library documentation should get you started.


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I guess pgRouting would be the best option for you. Could you please have a look at these post and say if this is in general what you are looking for? Creating many origin-destination routes with pgRouting (Answer of Otto Coster) If yes then there would be a additional loop neccessary do the calculations for all destinations



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