thanks Dave. from my days of schooling for a draftsman I remember studying perspective drawings and how to create a perspective drawing of a building of known dimensions. so i should be able to "reverse engineer" it. basically the completed perspective drawing is the photograph. then by reverse engineering it by using the methods used to create a perspective drawing such as construction lines, vanishing points, horizon line, ground line etc......... I can determine the actual size dimensions of the structure. I will still need to get the scale correct and this is were Don Wertz was correct. I will need to find one object in the photograph that I can estimate is true size. in this case the height of a door can be fairly accurately determined.
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