Table 2 The experimental water scope.

From: A method for compressing AIS trajectory based on the adaptive core threshold difference Douglas–Peucker algorithm

Boundary points

Longitude

Latitude

Upper left

\(\hbox {121}^{\circ }\) \(\hbox {49}^\prime \) \(\hbox {18}^{\prime \prime }\) E

\(\hbox {30}^{\circ }\) \(\hbox {14}^\prime \) \(\hbox {50}^{\prime \prime }\)N

Lower right

\(\hbox {122}^{\circ }\) \(\hbox {16}^\prime \) \(\hbox {57}^{\prime \prime }\)E

\(\hbox {29}^{\circ }\) \(\hbox {55}^\prime \) \(\hbox {45}^{\prime \prime }\)N