依据原始矢量数据计算的土地利用景观格局指数，可以在一定程度上揭示精度损失变化特征的规律和成因。
The landscape indices, calculated from the original vector data, can indicate the law of the change of the area accuracy loss.
景观格局是若干生态系统的综合体，受地貌、气候和其他外界多种因素的干扰，是模拟和预测地理要素变化趋势的基础。
Landscape pattern, which is the ecological complex and interfaced by the factors of landform, weather and etc, is the base of simulating and forecasting the mutative trend of geographical factors.
研究结果对于北京市景观格局特征和变化规律，对于城市景观生态环境的优化、土地的合理利用以及城市规划具有重要的意义。
Findings of the Beijing landscape pattern and changes in the urban landscape of the ecological environment is of great significance to the rational use of land and urban planning.
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