Fig 1.
The polygon approximation by Fourier descriptors for different shape types at different interceptive values.
Table 1.
The degrees of approximation (OD) of different shapes at designated interceptive values.
Fig 2.
(Group one is building feature with orthogonal boundary. Group two is lake feature with smooth boundary. Group three is linear feature with smooth boundary).
Table 2.
The degree of approximation OD with different interceptive value n.
Fig 3.
The morphing effects of different features with g interval 0.1.
Fig 4.
The morphing effects of lake feature with g interval 0.01.
Fig 5.
The morphing effects by linear interpolation method.
Table 3.
The time cost of morphing model by Fourier transformation.
Fig 6.
The relationship of time consumption and the interceptive value n.
Fig 7.
The relationship of time consumption and the number of point N.