Exercise : Measuring heights of trees outside the forest (TOF) in digital orthophotos (DOP)
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[[Image:shadow_length.png|450px|thumb|right|'''Figure A''': Shadow length ''s'' and object height ''h'']] | [[Image:shadow_length.png|450px|thumb|right|'''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 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 an overhead line tower was measured. If the lenght of a tree's shadow is known at the same time of the day we are able to compute .... |
==Estimating sun elevation== | ==Estimating sun elevation== |
Revision as of 17:01, 14 July 2014
Contents |
Shadows in orthorectified remote sensing images
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 an overhead line tower was measured. If the lenght of a tree's shadow is known at the same time of the day we are able to compute ....