Research on Application of Weighted Comprehensive Fitting Model in GPS Level

Because of the disadvantages of single fitting model in GPS level,this article introduces weighted comprehensive fitting model.With the real survey data of one construction,this article uses polynomial fitting model,polyhedial fitting model and weighted comprehensive fitting model to fit the abnormality of elevation in the survey area.By comparison and analysis,the author holds that the precision and stability of this model are better than the single model’s and this model also has the better reliability and practical value.