Sketching Around a Building (Concrete Example)

When sketching around an existing polygon/or building (example could be concrete), DO NOT INTERSECT LINES.

Self-Intersecting Lines

LandMark calculates polygon areas. In drawing concrete around a building or something similar, the entry of the line lengths is crucial. In the sketch images below, the one on the left a self-intersecting line was created with white area vs the one on the right is a polygon with the area. Both sketches start with the same line (highlighted pink), the difference starts at the blue dot. In the case of the self-intersecting lines, this will be treated as two polygons in the calculation.

Vectors for sketch on left (INCORRECT): Left 20, Up 40, Right 20, Down 50, Left 30, Up 60, Right 40, Down 60, Left 10, Up 10

Note: Even though it’s drawn in a clockwise direction, the (x,y) coordinate calls cause an intersection when drawn this way.
The square footage figured incorrectly (doubled).

Vectors for sketch on right (CORRECT): Left 20, Up 40, Right 20, Down 50, Right 10, Up 60, Left 40, Down 60, Right 30, Up 10

Note: Outside polygon drawn in counter-clockwise direction, doesn’t cause intersection.
The square footage figured correctly.