1. A method for classifying seismic attributes comprising: generating data points by cross plotting seismic attributes from a first data volume and a second data volume; encompassing at least one of the generated data points within a polygon; generating a reference line; determining an interpolation direction relative to the reference line; assigning an attribute value to the at least one generated data point encompassed within the polygon wherein the assigned attribute value is determined by interpolation based on the combination of its position to the reference line along the interpolation direction and the shape of the polygon.