On 10/14/07, Carlos Guâno Grohmann <[EMAIL PROTECTED]> wrote: > This is almost what I need. I need the results to be in range 0-360, > from North. So I can get a rose diagram, with petals weighted > according to azimuth frequency or to azimuth lenght, like the > attachment.
Here is a handy formula to get from mathematical "M" angles to geodetic "G" angles. Mathematical angles are where 0 is the X axis and the increase counter-clockwise, and geodetic angles begin on the Y axis and increase clockwise. The formula is in degrees. The formula is handy because it does it in one step without if/then conditionals. G = (450-M) - int( (450-M) / 360) * 360 HTH, Rich -- Richard Greenwood [EMAIL PROTECTED] www.greenwoodmap.com _______________________________________________ grassuser mailing list grassuser@grass.itc.it http://grass.itc.it/mailman/listinfo/grassuser
