灾后复杂地形区域的测量测绘模型设计

灾后地形变化复杂，基于单一线性模型的测量测绘方法，测量灾区坡度陡、高差大等复杂地形时，无法有效拟合复杂地形趋势、获取高程点精度差，导致测量精确度较低。设计一种用于灾后复杂地形区域的测量测绘模型，在外部DEM辅助下精化灾区地形DEM，对灾区遥感InSAR影像进行干涉定标，实现干涉影像与外部DEM的精准对应；将多模型的线性回归策略与灾后复杂地形趋势相拟合，对解缠干涉影像图中全部影像快，通过多模型的线性回归，逐个像素精确的去除相位解缠中多余相位，过滤无价值高程点，得到有效灾区地形高程图，从中采集精确地灾后复杂地形区域高程点。实验结果表明，该模型可提高灾后复杂地形区域绘图精确度，对总体灾区地形InSAR影像测量效率高，测量的平均高程误差为±6.2cm，比单一线性模型低±3.77cm。

Design of Survey and Mapping Model for Complex Topographic Areas after Disaster

The topographic change after disaster is complex. When surveying complex terrain such as steep slope and large elevation difference based on single linear model, the trend of complex terrain can not be fitted effectively, and the accuracy of elevation point is poor, which leads to low accuracy of surveying. A survey and mapping model for complex terrain area after disaster is designed. The terrain DEM of disaster area is refined with the assistance of external DEM, and the remote sensing InSAR image of disaster area is calibrated by interference, so as to realize the accurate correspondence between the interference image and the external DEM. The linear regression strategy of multi-model is fitted with the trend of complex terrain after disaster, and all images in the deconvolution interferogram are fast through multi-model. Linear regression eliminates the redundant phase in phase unwrapping accurately by pixels, filters the invaluable elevation points, and obtains the effective terrain elevation map of disaster area, from which the elevation points of complex terrain area after disaster can be accurately collected. The experimental results show that the model can improve the mapping accuracy of complex terrain area after disaster, and has high efficiency for InSAR image measurement of the overall terrain in disaster area. The average elevation error of the measurement is (+6.2 cm), which is (+3.77 cm) lower than that of the single linear model.