Mahmood Soltaninejad, M. Jafari, A. Noroozi, Seyed Akbar Javadi
{"title":"利用遥感技术评价伊朗Bam、Shahdad和Garmsar地区沙漠化项目中的植被变化","authors":"Mahmood Soltaninejad, M. Jafari, A. Noroozi, Seyed Akbar Javadi","doi":"10.22124/CJES.2021.4306","DOIUrl":null,"url":null,"abstract":"The face of the earth is always changing due to human activities and natural phenomena. Therefore, to optimize the management of the natural areas, knowledge of the trend, extent and estimation of land cover / use changes is considered necessary. Reviewing these changes through satellite images and evaluating their potential through modeling can help environmental planners and natural resource managers to make more informed decisions. In the present study, quantitative detection and evaluation of changes in vegetation were performed in the areas with combat desertification projects, Shahdad, Bam and Garmsar in Iran, during a 30-year period within 1987, 2002 and 2017. The Normalized Difference Vegetation Index (NDVI) and land use maps were produced using the Enhanced Thematic Mapper Plus (ETM+), Thematic Mapper (TM) and Operational Land Imager (OLI) satellite images in the three corresponding periods for the vegetation/non-vegetation, and agricultural lands. The Kappa coefficient of 0.83 to 0.86, 0.91 to 0.92, and 0.94 to 0.95 was calculated for 1987, 2002, and 2017 respectively, and the total accuracy was between 88 and 97. After providing the land use maps in different years, the monitoring of land use changes was investigated using the Change Detection method. According to the trend of changes during the periods, the results exhibited that the vegetated lands in these three areas had an increasing trend in average 31.33%, and the non-vegetated lands were turned to vegetated lands over time. In other words, they have declined by an average of 35%. Moreover, an increasing trend was found for the agricultural lands during the periods in average 4%. Eventually, the cost-effectiveness of projects implemented in the studied areas was calculated.","PeriodicalId":9640,"journal":{"name":"caspian journal of environmental sciences","volume":"19 1","pages":"47-57"},"PeriodicalIF":0.0000,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":"{\"title\":\"Evaluation of vegetation changes in desertification projects using remote sensing techniques in Bam, Shahdad and Garmsar regions, Iran\",\"authors\":\"Mahmood Soltaninejad, M. Jafari, A. Noroozi, Seyed Akbar Javadi\",\"doi\":\"10.22124/CJES.2021.4306\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The face of the earth is always changing due to human activities and natural phenomena. Therefore, to optimize the management of the natural areas, knowledge of the trend, extent and estimation of land cover / use changes is considered necessary. 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After providing the land use maps in different years, the monitoring of land use changes was investigated using the Change Detection method. According to the trend of changes during the periods, the results exhibited that the vegetated lands in these three areas had an increasing trend in average 31.33%, and the non-vegetated lands were turned to vegetated lands over time. In other words, they have declined by an average of 35%. Moreover, an increasing trend was found for the agricultural lands during the periods in average 4%. 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引用次数: 1
摘要
由于人类活动和自然现象,地球的表面总是在变化。因此,为了优化自然区域的管理,了解土地覆盖/利用变化的趋势、程度和估计是必要的。通过卫星图像审查这些变化,并通过建模评估其潜力,可以帮助环境规划者和自然资源管理者做出更明智的决定。在1987年、2002年和2017年的30年间,对伊朗沙赫达德(Shahdad)、巴姆(Bam)和加尔姆萨尔(Garmsar)等实施荒漠化防治项目的地区的植被变化进行了定量检测和评价。利用Enhanced Thematic Mapper Plus (ETM+)、Thematic Mapper (TM)和Operational land Imager (OLI)卫星影像,绘制了三个时段的植被/非植被和农业用地归一化植被指数(NDVI)和土地利用图。1987年、2002年和2017年的Kappa系数分别为0.83 ~ 0.86、0.91 ~ 0.92和0.94 ~ 0.95,总准确率在88 ~ 97之间。在提供不同年份土地利用图的基础上,采用变化检测方法对土地利用变化进行监测。结果表明:随着时间的推移,3个地区的植被用地面积平均增加了31.33%,非植被用地逐渐向植被用地转变;换句话说,它们平均下降了35%。此外,农业用地在此期间平均增加4%。最后,计算了在研究地区实施的项目的成本效益。
Evaluation of vegetation changes in desertification projects using remote sensing techniques in Bam, Shahdad and Garmsar regions, Iran
The face of the earth is always changing due to human activities and natural phenomena. Therefore, to optimize the management of the natural areas, knowledge of the trend, extent and estimation of land cover / use changes is considered necessary. Reviewing these changes through satellite images and evaluating their potential through modeling can help environmental planners and natural resource managers to make more informed decisions. In the present study, quantitative detection and evaluation of changes in vegetation were performed in the areas with combat desertification projects, Shahdad, Bam and Garmsar in Iran, during a 30-year period within 1987, 2002 and 2017. The Normalized Difference Vegetation Index (NDVI) and land use maps were produced using the Enhanced Thematic Mapper Plus (ETM+), Thematic Mapper (TM) and Operational Land Imager (OLI) satellite images in the three corresponding periods for the vegetation/non-vegetation, and agricultural lands. The Kappa coefficient of 0.83 to 0.86, 0.91 to 0.92, and 0.94 to 0.95 was calculated for 1987, 2002, and 2017 respectively, and the total accuracy was between 88 and 97. After providing the land use maps in different years, the monitoring of land use changes was investigated using the Change Detection method. According to the trend of changes during the periods, the results exhibited that the vegetated lands in these three areas had an increasing trend in average 31.33%, and the non-vegetated lands were turned to vegetated lands over time. In other words, they have declined by an average of 35%. Moreover, an increasing trend was found for the agricultural lands during the periods in average 4%. Eventually, the cost-effectiveness of projects implemented in the studied areas was calculated.