absolute difference algorithm的用法和样例：
- The global tilt message caused by the atmosphere turbulence can be extracted using the cross-correlation coefficient algorithm and the sum of absolute difference algorithm.
- Also the relationship between threshold and alarm probability is derived and a region of threshold factor which make alarm probability be less than a defined value is given for Mean Absolute Difference algorithm.
- the Minimum Within-Cluster Absolute Difference algorithm
- Equation derivation and simulated calculation demonstrate that double difference algorithm allows us to get the absolute locations of earthquakes with certain accuracy by using the nearby station phase arrivals.