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Table 2 The relation between grid cells DN and GS

From: A virtual grid-based real-time data collection algorithm for industrial wireless sensor networks

DN Relation between corresponding grid cell and GS
0 The corresponding grid cell is GS
1 (up side of GS)&&(right side of GS)
2 (up side of GS)&&(left side of GS)
3 (down side of GS)&&(left side of GS)
4 (down side of GS)&&(right side of GS)
5 (same column with GS)&&(up side of GS)
6 (same row with GS)&&(left side of GS)
7 (same column with GS)&&(down side of GS)
8 (same row with GS)&&(right side of GS)