BackgroundGreenbelt, known as the most restrictive form of urban containment policy, is a geographical boundary around a city or urban region to prevent urban sprawl. In the present study, the urban greenbelt plans were investigated with spatial, temporal, and statistical attitudes in Mashhad city, Iran. Spatial and temporal data analyses were carried out in ENVI, and GIS programs based on satellite imageries in addition to the expert analyzes of SWOT (strengths, weaknesses, opportunities, and threats) and QSPM (quantitative strategic planning matrix) matrixes to achieve the key strategies concerning the revitalization of a new greenbelt plan.ResultsFour temporal sequences of Landsat imageries were extracted for 1988, 1998, 2008, and 2018 to classify the expansion of real estates and urban sprawl. The results showed that the legal greenbelt plan failed after 10 years because the status of greenbelt in 2018 revealed nearly of occupation by sprawl expansion over than 20%. Then a new greenbelt plan was proposed around the city. Based on the lowest value of the environmental change index (ΔYi), with an average of 0.14, the proposed greenbelt plan will demonstrate an optimum efficiency in the future time intervals (2030–2050).ConclusionsTherefore, expert analyzes of SWOT and QSPM matrixes were shown that the essential weakness of greenbelt planning in the Mashhad city depends on the lack of a legal mechanism to conserve the greenbelt boundaries. Therefore, the total sum score of external factor’s matrix with the value of 2.65 demonstrated that the opportunities for greenbelt planning in the study area are more effective than threats in the study area. Ultimately, six key strategies in greenbelt planning were presented to achieve a general equilibrium through future urban development.

中文翻译：

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伊朗马什哈德市城市绿地规划战略空间分析

背景绿带，被称为最严格的城市遏制政策形式，是围绕城市或城市区域的地理边界，以防止城市蔓延。在本研究中，对伊朗马什哈德市的城市绿地规划进行了空间、时间和统计态度调查。在 ENVI 中进行时空数据分析，以及基于卫星图像的 GIS 程序以及 SWOT（优势、劣势、机会和威胁）和 QSPM（定量战略规划矩阵）矩阵的专家分析，以实现关键战略关于振兴新绿化带计划。结果提取了 1988 年、1998 年、2008 年和 2018 年的 Landsat 图像的四个时间序列，以对房地产扩张和城市扩张进行分类。结果显示，合法的绿地计划在10年后失败，因为2018年绿地状况显示几乎超过20%的蔓延扩张被占用。然后在城市周围提出了一个新的绿化带计划。基于环境变化指数（ΔYi）的最小值，平均为 0.14，拟议的绿地计划将在未来的时间间隔（2030-2050 年）展示最佳效率。因此，专家对 SWOT 和 QSPM 矩阵的分析是表明马什哈德市绿地规划的根本弱点在于缺乏保护绿地边界的法律机制。因此，值为2的外部因素矩阵的总和得分。65 表明研究区绿地规划的机会比研究区的威胁更有效。最后，提出了绿带规划中的六项关键策略，以通过未来的城市发展实现总体平衡。