sun angle and azimuth

[Phil Chaney]

> 
> Hello Netters:
> 
>      If I have a TM image of Yellowstone Nat'l Park made at 17:40 Greenwich
> time on August 2, 1989, how can I calculate the sun's altitude and azimuth?
> I want to split the image into well-lighted and shaded areas in order to
> get a better image classification of burn severity.  I know the center of
> the image, and that it was made at 11:40 AM local time (I think).
>      Can anyone point me in the right direction (grin)?
>                                    Thanks,


I recommend that you contact Dr. David Knowles in the Dept. of Civil Eng.
here at the U. of Arkansas (501) 575-3403. He has developed a software
program for professional surveyors that calculates the position of the
sun for determining True North. The input that is required is lat/lon
of position, date, and UTC time.
........................................................................
Phillip L. Chaney                                  Center for Advanced
Research Specialist                *    *          Spatial Technologies
                               *            *         /\    /\    /\    
CAST/NCRI-SW                                       --------/--\--------   
University of Arkansas              ____            /    \/    \/    \  
Phone: (501) 575-4575                /\            National Center for 
E-mail: phil at spock.uark.edu         /  \           Resource Innovations     
........................................................................