(1) If the plane of the building is square, it is the easiest to measure, just take the intersection of four corners as the center point.
(2) If the house plane is rectangular, the measurement method is the same as that of a square, and the intersection of the four corners is also the center point.
(3) If the plane of the building is trapezoidal, it is necessary to average the concave and convex parts to form a square or rectangular area, and then find its center point according to the square or rectangle.
(4) If the whole house is square or rectangular, but only one (position A) or two (position B) on the edge has a slight part protruding, remove the protruding part and find the center point from the intersection of the four corners.
(5) If the whole house is square or rectangular, and only one (position A) or two (position B) on the side has a small part of depression, then the depression should be filled up and the center point should be found according to the intersection of the four corners.
(6) If the convex and concave parts on the edge of the house are large, and the areas of the two parts are not much different, it is necessary to change the convex and concave parts into square areas on average again, and then take the intersection points, so that it is easy to find the center point.
(7) If the plane of the house is L-shaped, there must be a straight line parallel between the two sides, and the intersection of the two straight lines is the center point.
(8) If the plane of the house is a triangle, make a point at half of the diagonal lines on both sides, then draw a straight line with the diagonal line, and the other diagonal line will be treated the same, and then draw a straight line vertically downward from the upper corner of the triangle, so that the intersection of the three lines is the center point of the store.