I'm assuming that distance measurements as used on plot plans and
property deeds are measured horizontally, irrespective of the grade of
the land, unless otherwise stated.
I'm not trying to DIY survey my lot, but the question came up when a
neighbor showed me how he'd "located" the back of his 100 foot deep lot
by running a tape along the ground, said ground having about a 1.5 in 10
slope most of the way.
I told him I thought the measurement should have been made on the
horizontal, and by doing it the way he did, he ended up about a foot
short of the line he was seeking.
Jeff Wisnia (W1BSV + Brass Rat '57 EE)
"If you can smile when things are going wrong, you've thought of someone
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