sundial-Infer image acquisition time from shadow orientation

sundial: Infer image acquisition time from shadow orientation

This standalone executable function provides a means of inferring the acquisition time of an image using the sundial method. This approach involves measuring the orientation of a shadow on the image and using the calculated solar geometry for that date to identify the time at which the sun would have been positioned in the sky so as to cast the observed shadow. The shadow orientation measurement can be made on the image and the lat and loncoordinates of the base and tip of the shadow are the inputs to this function. The shadow line must be digitized from base to tip. This function incorporates source code from sun_position.m to calculate solar azimuths.