为了计算交通小区的建筑容积率,利用RPC模型直接从单幅高分辨率卫星影像上提取建筑物高度和层数信息.首先,在纠正后的影像上量取建筑物墙脚点的大地坐标,在影像坐标系中分别量取同一铅垂线上的墙脚点坐标和屋顶点坐标.然后,将量测结果标准化,代入RPC模型,经迭代运算得到墙脚点和屋顶点的大地高,两者之差即为建筑物高度.实验结果表明,利用RPC法从空间分辨率为0.61m的QuickBird影像上提取的房高中误差为±0.57m,而从分辨率为1.0m的IKONOS影像上提取的房高中误差为4-0.80m,由此表明所提方法的总体精度在1个像元以内.
In order to calculate the building volume rate of a traffic area, the height of a building and its number of floors are exacted directly from a single high resolution satellite image by using the RPC(rational polynomail cofficient) model. First, the geodetic coordinates of the basement comer