Table 4: China’s coastline length prediction table.

YearCoastline length (m)Prediction length (m)Residual (m)Relative error

200718,501,296 18,501,296
200818,515,830 18,549,380 −33550.330.00
200918,599,902 18,678,455 −78552.970.00
201018,644,768 18,808,427 −163659.730.01
201118,946,699 18,939,304 7394.300.00
201218,501,296
2013113,250,456
201419,337,425
201519,471,983