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Quality grade | Judgement standard |
Selection standard | Technology correlation | Location correlation | Data sources | Acquiring methods | Time | Representation of data |
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5 | Transparent, verified, and generally applicable | Representative process and representative technology | Represent value of local area | Verified data from independent source | Actual measurement | <3 years | Long time and large sample |
4 | Transparent, verified, and no generally applicable | Representative process and similar technology | Average value of local area | Verified data from relevant source | Measurement-based calculation | <6 years | Long time and small sample |
3 | Transparent, no verified, and no generally applicable | Representative process and different technology | Other area with similar production process | Unverified data from independent source | Hypothesis-based calculation | <10 years | Short time and large sample |
2 | Selective transparent and no selection standard | Similar process and similar technology | Other area with slightly similar production process | Unverified data from irrelevant source | Expert estimation | <15 years | Short time and small sample |
1 | Unknown selection standard | Similar process and different technology | Unknown location | Unverified data from relevant source | Calculation with no guaranteed quality | >15 years | Cannot be obtained |
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