In the past, I've used tools like SunCalc and The Photographer's Ephemeris to plan landscape shots in advance, based on where the sun and moon rise and set. Is there a similar tool that can overlay the angular field of view of a lens?
I want to drop a marker at the camera position, and either display the angle of a field of view that I select on the map, or draw a field of view based on an angle I specify. Either one would be fine. Basically an angular version of the "ruler" tool in Google Maps and Google Earth.