Question: Loop and plot

I am not able to use colors flexibly in contourplot3d. So, I am trying another way to get my plot. But I am not exactly getting my result. This is what I am trying to do. I need help with these three steps. 1) For Latitude from -10 degrees to 10 degrees and longitude from -30 degrees to 30 degrees, I need to calculate aa:=1.4*cos(latitude)-2*sin(longitude). 2)The above value of 'aa' gives color. (eg. if aa<><><>3 color= red etc) 3) Then plot this point with color from step 2 at (x,y) given by x := 2*sqrt(2)*cos(latitude)*sin((1/2)*longitude)/sqrt(1+cos(latitude)*cos((1/2)*longitude)) and y:=sqrt(2)*sin(latitude)/sqrt(1+cos(latitude)*cos((1/2)*longitude)) Any help is appreciated. Thanks
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