Two methods for measuring the changes in patch-number and area of Mangrove driven by various factors through different ways

Chungan, 李春干 Li; Huabing, 代华兵 Dai

doi:10.5846/stxb201305301247

Acta Eco Sin

2015

DOI: 10.5846/stxb201305301247

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Two methods for measuring the changes in patch-number and area of Mangrove driven by various factors through different ways

李春干 Li Chungan¹,

代华兵 Dai Huabing²

Abstract: Li C G, D B.Two methods for measuring the changes in patch鄄number and area of mangrove driven by various factors through different ways.

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2021

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“…with the 2015 polyline and cutting the 2015 polygon with the 2017 polyline. Then the polygon of the two years was overlaid on the DOM to individually determine the mechanism and driving factors of changes in patch extent(Li et al 2012;Li 2013;Li and Dai 2015).Dynamic Analysis of Crown HeightUsing the CHM for the two years, the overall spatial pattern of tree height in the mangrove patch in 2015 and 2017 was analyzed. The spatial pattern of mangrove canopy in typical areas was analyzed by longitudinal (vertical to seawall) and horizontal (parallel to seawall) pro le lines.d-CHM was used to analyze the spatial evolution of canopy height from 2015 to 2017.…”

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Spatial Dynamic Analysis of A Mangrove Patch Based On Unmanned Aerial Vehicle: A Case Study In Pear Bay In Guangxi, China

Lin

Zhou

et al. 2021

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This study investigated the short-term spatial variability of an mangrove patch, located in the Pearl Bay in Guangxi, China. Unmanned aerial vehicle (UAV) imagery covering the period from March 2015 to October 2017 were used and the following models were developed: two annual ultra-high resolution spatial resolution digital orthophoto maps (DOMs), two digital elevation models (DEMs), two digital surface models (DSMs), two canopy height models (CHMs), and a canopy height difference model (d-CHM). Using these models, the spatial dynamics of the extent and canopy height of the patch were analyzed. The resolution of the DOMs was 0.1 m, with an average geometrical error of 0.17 m and a maximum error of 0.44 m. The resolutions of DEMs, DSMs, CHMs, d-CHM were all 1 m. The average elevation errors of CHM in 2015 and 2017 were 0.002 m and -0.001 m, respectively, with maximum absolute errors of 0.034 m and 0.030 m, respectively. The average elevation error of d-CHM was -0.003 m and the maximum absolute error was 0.036 m, and the data quality were rated as good. From 2015 to 2017, the area of the mangrove patch increased from 8.16 ha to 8.79 ha, with an average annual increase of 3.7%. Specifically, the areas of expansion, shrinkage, and maximum seaward expansion were 6356 m2, 19 m2, and 24 m, respectively. The driving factor for the variability was natural processes. Stand canopy height exhibited a particular trend of decrease from northwest to southeast (horizontal; parallel to the seawall) and from the land to the sea (vertically; perpendicular to the seawall). From 2015 to 2017, 88.2% of the patch area showed increased canopy height, with an average increase of 0.78 m and a maximum increase of 3.2 m. In contrast, 11.8% of the patch area showed decreased canopy height with a maximum decrease of 3.1 m. The main reason for the decrease in canopy height was the death of trees caused by serious insect plagues. On the other hand, the reason for the increase in height could be attributed to the natural growth of mangrove trees, but further studies are required to verify the cause. UAV remote sensing has an incomparable advantage over traditional methods in that it provides extremely detailed and highly accurate information for in-depth study of the spatial evolution of mangrove patches, which would significantly contribute towards the protection and management of mangroves.

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confidence: 99%

Spatial Dynamic Analysis of A Mangrove Patch Based On Unmanned Aerial Vehicle: A Case Study In Pear Bay In Guangxi, China

Lin

Zhou

et al. 2021

Preprint

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Two methods for measuring the changes in patch-number and area of Mangrove driven by various factors through different ways

Abstract: Li C G, D B.Two methods for measuring the changes in patch鄄number and area of mangrove driven by various factors through different ways.

Cited by 1 publication

References 1 publication

Spatial Dynamic Analysis of A Mangrove Patch Based On Unmanned Aerial Vehicle: A Case Study In Pear Bay In Guangxi, China

Spatial Dynamic Analysis of A Mangrove Patch Based On Unmanned Aerial Vehicle: A Case Study In Pear Bay In Guangxi, China

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