3D Surface Matching

Hi.

I have some values as 3D surface in polar coordinates (theta, phi and value).

And i want to match this dataset to another dataset compare them and give a score.

For example; i have and unit sphere, (0:5:360,0:5:360,1) and i have some random valued sphere whose values are between (0,1). If some sphere has all values 1 (means that unit sphere) it gets a score of 1 and if it is so random it gets close to 0 score.

My question is, can i get the score from corrcoef(a,b)?

Is this a good idea?

How can i improve this comparison?

Is there a better comparison algorithm?

Thanks for answers.

Regards...