Design And Research Of Vegetation Multi-Angle Spectral Information Acquisition System

With the rapid development of remote sensing technology, the study on the remote sensing information models of vegetation, soil moisture, crop drought-damaged in the fields of agriculture, forestry and land management is increasingly furthered. Data acquisition and analysis in ground remote sensing experiments is the basis of these researches. The vegetation multi-angle spectral data acquisition system, applied to field remote sensing experiments, is the key equipment to measure spectral reflectance of ground objects. It can take fast measurements of bidirectional reflectance factors in hemisphere space. With the data used in geographical remote sensing systems, various problems in ecology and remote sensing science can be solved. The main work of this thesis includes the following 3 aspects.Firstly, vegetation multi-angle spectral information acquisition system with new structure was designed though the requirements analysis of multi-angle observation system. And a prototype was produced with the complete of the control system. The prototype is characterized by light overall quality, simple structure, accurate positioning, diverse observation modes, rich measurement points and small shadow in the observation range.Secondly, experiments of assessing the mechanical system accuracy were carried out based on the prototype of vegetation multi-angle spectral information acquisition system. A new type of two-dimensional sphere error assessment method was proposed. The accuracy parameter was obtained though the data processing based on the core genetic algorithm. Besides, the influence of mechanical system accuracy to spectrometer field of view was figured out.Thirdly, multi-angle spectral data collecting experiments were implemented for different targets in indoor and outdoor environments. The different observing functions of prototype were tested and the reliability and stability of the mechanical system and control system were verified. Experimental data were collected for analysis and there came some preliminary conclusions. Spectral data were accumulated for typical ground objects spectrum database.