from [Python Script examples for geoprocessing shapefiles without using arcpy](http://gis.stackexchange.com/questions/64146/python-script-examples-for-geoprocessing ...
mean = np.array([0.0,0.0,0.0]) cov = np.array([[1.0,-0.5,0.8], [-0.5,1.1,0.0], [0.8,0.0,1.0]]) data = np.random.multivariate_normal(mean, cov, 50) # regular grid ...
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