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Geostatistical approach to assess mangrove spatial variability: a bi-decadal scenario over Raigarh coast of Maharashtra
Journal of Coastal Conservation ( IF 2.1 ) Pub Date : 2021-01-31 , DOI: 10.1007/s11852-021-00813-8
Barnali Das , Anargha Dhorde

The present study aims at assessing the bi-decadal scenario related to the spatial variability of Mangroves over Raigarh district by adopting Geostatistical approach. Landsat TM/OLI data for the year 2000 and 2019 were employed for the study. Methodology adopted, involve computation and plotting of Semi-variogram (in ‘R’) with NDVI data, which was extracted for 28 homogeneous mangrove patches. These patches, based on similarity of Semi-variogram components, were further classified into clusters. Semi-variogram pattern for the year 2000 revealed a low range and high sill, indicating greater variation in the dataset that was correlated for a shorter distance. While in the year 2019, the Semi-variogram obtained for the same mangrove patches, exhibited high range and low sill. This clearly indicates a high spatial correlation associated with relatively low variation within the data. During the year 2019, some patches have shown evidences of exponential growth of mangroves that were represented by higher NDVI values, which were more similar, correlated and dependent. Overall rise in NDVI value indicates that the health status of mangroves has increased in 2019 along with natural expansion of mangrove colony. Over bi-decadal time span, mangrove ecology has also improved corresponding to higher NIR reflectance. The present research can be implemented to mangrove management and conservation purpose as this technique reveals the spatial dependency in the dataset.



中文翻译:

评估红树林空间变异性的地统计学方法:马哈拉施特拉邦赖加尔海岸的双年代际情景

本研究旨在通过地统计方法评估与赖加尔地区红树林空间变异性有关的双年代际情景。本研究采用了2000年和2019年的Landsat TM / OLI数据。采用的方法包括用NDVI数据计算和绘制半变异函数(在“ R”中),该数据是从28个同质红树林斑块中提取的。基于半变异函数分量的相似性,将这些补丁进一步分类为聚类。2000年的半变异函数模式显示了较低的距离和较高的底线,表明数据集中的较大变化与较短的距离相关。在2019年,对于相同的红树林斑块获得的半变异函数显示了高范围和低基石。这清楚地表明与数据内相对较低的变化相关的高空间相关性。在2019年期间,一些斑块已经显示出以较高的NDVI值表示的红树林呈指数增长的证据,NDVI值更高,更相似,相关性和依赖性更高。NDVI值总体上升表明,随着红树林群落的自然扩张,红树林的健康状况在2019年有所增加。在十年的时间跨度内,红树林的生态也得到了改善,对应于更高的近红外反射率。由于这项技术揭示了数据集中的空间依赖性,因此本研究可用于红树林的管理和保护目的。一些斑块已显示出以较高的NDVI值表示的红树林呈指数增长的证据,而NDVI值则更相似,相关性和依赖性更高。NDVI值总体上升表明,随着红树林群落的自然扩张,红树林的健康状况在2019年有所增加。在十年的时间跨度内,红树林的生态也得到了改善,对应于更高的近红外反射率。由于这项技术揭示了数据集中的空间依赖性,因此本研究可用于红树林的管理和保护目的。一些斑块已显示出以较高的NDVI值表示的红树林呈指数增长的证据,而NDVI值则更相似,相关性和依赖性更高。NDVI值总体上升表明,随着红树林群落的自然扩张,红树林的健康状况在2019年有所增加。在十年的时间跨度内,红树林的生态也得到了改善,对应于更高的近红外反射率。由于这项技术揭示了数据集中的空间依赖性,因此本研究可用于红树林的管理和保护目的。随着更高的近红外反射率,红树林的生态也得到了改善。由于这项技术揭示了数据集中的空间依赖性,因此本研究可用于红树林的管理和保护目的。随着更高的近红外反射率,红树林的生态也得到了改善。由于这项技术揭示了数据集中的空间依赖性,因此本研究可用于红树林的管理和保护目的。

更新日期:2021-01-31
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