With the development of digital city, the rapid acquiring and processing of the urban spatial information have become the key technology for constructing digital city. Thanks to the high resolution of airborne remote sensing and high resolution satellite remote sensing, these techniques can play important roles in acquiring and updating the urban spatial information. Modular airborne remote sensing information acquiring and high resolution remote sensing processing suitable to digital city are presented in this paper, and airborne remote sensing data acquired by airborne 3Dimager are applied to digital city as a demonstration.