In a
previous post I described how to use a surveying technique called triangulation to measure garden boundaries and locate accurately other garden elements. Offsets are another simple, effective way of
measuring boundaries, locating borders, structures and other important points within the garden. They are particularly good for
measuring curves.
Secure a
long tape to a known or measured point on the house wall with a tent peg or a
screwdriver. You can use another fixed point if the house is not
convenient, but the house is always best as it is composed of straight lines
and regular angles.
Walk with
the tape to the end of the garden, unreeling as you go. Ensure the tape is at a 90° angle to the
house. Make sure the tape is flat to the ground and peg it down securely so
that it is straight and as taut as possible. You can buy a special metal
square to get the angle right, but a square piece of cardboard or wood will
work just as well.
Take
measurements at a 90° angle to the tape at regular intervals and to all
relevant features. Using a rigid metal
tape makes it easier to ensure you are measuring at a 90° angle to the
tape. Mark these measurements clearly on the sketch survey. If the survey becomes
too cluttered plot individual features on separate sheets. Label
everything, including any separate sheets clearly to ensure you can translate
them onto the finished plan when you draw it up at home.
Example of measuring boundaries using offsets
Example of measuring a curve using offsets
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