Topographic survey and construction area measurement of Zhengzhou XX community project shows that the construction area is 61,189.8 square meters and a total construction area of 115789.2 square meters. It is equipped with underground parking garage and four projects for property and community. The project mainly carries out the approved building area measurement and 1:500 topographic map measurement. The building area measurement mainly focuses on the approved planning permit annex and the approved red line map, and measures the area of all floors.