Shallow earth temperature is influenced by surface temperature change everyday and every year, topographic change, elevation change and surface feature change, so it should be corrected.
浅层地温受到地表气温的日、年变化、地形变化、高程变化和地貌变化等的影响，应对实测值进行相应校正。
2
Soundness of the rock surface must be included in the topographic study.
岩石表面的坚固性，必须包括在地形研究之内。
3
So, instead of'intermediate layer correction', we should adopt free air gravity anomaly and'topographic trend surface correction', which result in topographic trend surface free air gravity anomaly.