Table 12 Ideal solutions and closeness calculation results.

From: Optimization of residual coalbed methane extraction wells and analysis of development and emission reduction benefits in the Songzao mining area

Coal mine name

Positive ideal solution D+

Negative ideal solution D−

Closeness Ci

Sorting

Songzao

0.094737

0.2571

0.730735

1

Fengchun

0.221508

0.172041

0.437153

2

Shihao

0.213186

0.143087

0.401622

3

Yuyang

0.212677

0.137202

0.392141

4

Datong no. 1

0.241455

0.149849

0.382948

5

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