Seems Conrad is on top of it !
From: Conrad Harrison <metamorphs96@gmail.com>
To: seaint@seaint.org
Sent: Tuesday, December 30, 2008 10:22:04 PM
Subject: Re: Wind Load Topographic Effects
My Understanding is that the quadrant is 90 degrees. But need to draw two orthogonal axes for the building, and 8 cardinal/compass directions for the wind. The 4 orthogonal directions then experience the maximum wind in the quadrant defined by 45 degrees either side of the orthogonal axis.
Regards
Conrad