Andy, This may help with math: http://boatsafe.com/tools/horizon.htm AZ LOOKAROUND - Since 1978 Build a 120/35mm Lookaround! The Lookaround E-Book FREE COPY http://www.panoramacamera.us > -------- Original Message -------- > Subject: [SPAM] Re: How tall should the turbines be? > From: ADavidhazy <andpph@xxxxxxx> > Date: Sun, March 21, 2010 11:04 am > To: List for Photo/Imaging Educators - Professionals - Students > <photoforum@xxxxxxxxxxxxxxxxxx> > > > I think this is a good solution although in this case there would be no > landmarks since the towers are planned for somewhere in a big lake (50 miles > wide) - but I think this could be worked out on a map knowing the angle of view > of the camera and its location on shore. > > I was also thinking that since one knows turbine height and distance and the > lens focal length one can determine the size of the image of the turbine on the > sensor. This size then would bear a relationship to the height of the sensor and > this then could be maintained in any final "seascape" illustration. > > But if the distance is over 3 miles or so then the curvature of the Earth may > play a part as well as to how much of the towers reaches above the horizon. If > the towers are more than about 12 miles out they would be invisible from eye > level on the shoreline. > > and Emily: > > >Are these anti-turbine people? If so, are you sure you want to help > >them? I'd consider the ethics of this before going any further. > > I don't know - the person who asked is a reporter for a local newspaper. > > Andy > > James Schenken wrote: > > > The straightforward approach is the take the image of the site and carefully > > measure the actual width on the ground from edge of the frame to the edge of > > the frame. > > For example, suppose the site being pictured is 1/4 mile wide ( 1760 feet ). > > A wind turbine sited there will be about 1/4 (400/1760) of the width of the > > scene. If the print is 8" by 12" ( assuming a 35mm frame proportions in the > > original image ) then the turbine images will be the same ratio in height, > > or just under 3 inches high when placed in the image. > > Then you can scale the image to whatever final size is needed. > > Cheers, > > James
