GPS Level Height Manage Method Based on DEM and Gravity Model

The height manage technique using DEM model and gravity model together is put forward,and this technique is used to manage one city fifteen level height data in 8 000 km2.The result is compared with that of tradition technique,and the gravity model matching test is done at the same time.The experimental resultshows that the technique to be the same with the mountainous area where is very wide and there is not enough level height data.