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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 ...


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.


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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