作者：盘爱国

国家测绘局第七地形测量队为海南省海口地区地形形变和地面不均匀沉降的监测工作提供测绘保障服务。自1999年以来，该队对海口地区120平方公里布设的地形形变和地面不均匀沉降监测网的30个监测点进行监测，为海口市地形形变、海口地区中长期地震预报研究和地下水开采可能引起的地面沉降提供直观的科学数据。国家测绘局第七地形测量队对此项长期任务很重视，每年都派出业务精干的测绘小组进行沉降形变观测。在施测前进行仪器检定，对控制点进行普查，认真做好选项点埋石和进行水准观测，仔细校对每组数据，确保提供高精度的测绘成果。

VII of the State Bureau of Surveying and Mapping Team, Ordnance Survey of Haikou in Hainan Province for the terrain and ground deformation monitoring of differential settlement of the security services provided by the Survey and Mapping. Since 1999, the team of one hundred and twenty square kilometers area of Haikou laid uneven terrain deformation and ground subsidence monitoring network of 30 monitoring stations to monitor for terrain deformation in Haikou, Haikou regional and long-term earthquake prediction research and the exploitation of groundwater may lead to settlement of the scientific data to provide intuitive. VII of the State Bureau of Surveying and Mapping Ordnance Survey on the long-term task force attaches great importance to every year to send business team capable of mapping deformation settlement. In the testing apparatus before the test, conducting a census of the control points, option point and do a good job and standard of buried stone observation, carefully proofread each data mapping to ensure the provision of high-precision results.