投影寻踪法的土地生态安全评价

Assessment of land ecological security based on projection pursuit method

针对土地生态安全评价所涉及的评价指标众多,数据量较大,评价体系具有明显的高维、非线性的特点。本文采用投影寻踪法构建土地生态安全评价模型,并应用模拟退火算法优化投影方向,将高维数据投影到低维空间上,根据优化出的一维投影值计算评价区域的土地生态安全度及主要影响要素。该模型在实际应用中取得了较为满意的效果,评价结果客观科学,过程清晰,可操作性强,为土地生态安全评价提供了一种可供借鉴的方法和思路。

Land ecological security assessment involves large amount of indexes and data, the evaluation system has obvious higher dimensional, non-linear characteristics. The article used a projection pursuit method （PP） to develop an assessment model of land ecological security. In the proposed model, the projection direction was optimized by using Tabu Search algorithm （TS）, the high-dimensional data was projected into low dimensional space, according to the optimization of one-dimensional projection value to calculate the land ecological security and main influence factors of the regional. The result of the practical application of the model was satisfying, the result of the assessment was objective and scientific, and the process was clear and operable. The model provided an approach and ideas for land ecological security evaluation.