对地观测激光成像由机载激光测高技术发展而来,有着二三十余年的发展历史,早期实现机下点测高,精度较差。后来发展到机载扫描测高,这是目前发展与应用的主流。现在几乎所有的机载激光测高+光谱成像系统或机载直接激光三维成像系统 Ground-based laser imaging from the development of airborne laser altimeter technology has more than twenty or thirty years of development history, the early realization of measuring point under the machine, the accuracy is poor. Later developed to airborne altimetry, which is the current development and application of the mainstream. Now almost all of the airborne laser altimeter + spectral imaging system or airborne direct laser three-dimensional imaging system