Spatio-temporal evolution and distribution of cultural heritage sites along the Suzhou canal of China

Heritage Science

Table 6 Statistics of the ellipses in the six historical periods

Period	X-Axis Length (m)	Y-Axis Length (m)	Elliptical Area (m²)	Rotation Angle (◦)
Pre-Sui	176.535	71.191	39481	70.72
Sui and Tang	157.519	129.589	64124	59.12
Five Dynasties to Song	146.447	111.198	51157	49.21
Yuan and Ming	113.913	135.908	48635	16.79
Qing	90.140	128.312	36334	168.45
Modern Times	88.471	125.648	34921	168.53