Exercise : Measuring heights of trees outside the forest (TOF) in digital orthophotos (DOP)

Shadows in orthorectified remote sensing images

Figure A: Shadow length s and object height h

A simple application of the intercept theorem in elementary geometry is to determine the height of a tree by measuring the shadow length. According to Fig. A the shadow length and the height of a man made object such as a overhead line tower was measured. If the leght of a tree's shadow is measured at the same time of the day we are able to compute ....