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首页> 外文期刊>International journal of remote sensing >Integrating LIDAR elevation data, multi-spectral imagery and neural network modelling for marsh characterization
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Integrating LIDAR elevation data, multi-spectral imagery and neural network modelling for marsh characterization

机译：整合LIDAR高程数据，多光谱图像和神经网络建模以实现沼泽特征

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Vertical elevation relative to mean sea level is a critical variable for the productivity and stability of salt marshes. This research classified a high spatial resolution Airborne Data Acquisition and Registration (ADAR) digital camera image of a salt marsh landscape at North Inlet, South Carolina, USA using an artificial neural network. The remote sensing-derived thematic map was cross-referenced with Light Detection and Ranging (LIDAR) elevation data to compute the frequency distribution of marsh elevation relative to tidal elevations. At North Inlet, the median elevation of the salt marsh dominated by Spartina alterniflora was 0.349 m relative to the North American Vertical Datum 1988 (NAVD88), while the mean high water level was 0.618 m (2001 to May, 2003) with a mean tidal range of 1.39 m. The distribution of elevations of Spartina habitat within its vertical range was normal, and 80% of the salt marsh was situated between a narrow range of 0.22 m and 0.481 m. Areas classified as Juncus marsh, dominated by Juncus roemerianus, had a broader, skewed distribution, with 80% of the distribution between 0.296 m and 0.981 m and a median elevation of 0.519 m. The Juncus marsh occurs within the intertidal region of brackish marshes and along the upper fringe of salt marshes. The relative elevation of the Spartina marsh at North Inlet is consistent with recent work that predicts a decrease in equilibrium elevation with an increasing rate of sea-level rise and suggests that the marshes here have not kept up with an increase in the rate of sea-level rise during the last two decades.
机译：相对于平均海平面的垂直海拔是盐沼生产力和稳定性的关键变量。这项研究使用人工神经网络对美国南卡罗来纳州北入口盐沼景观的高分辨率航空数据采集和注册（ADAR）数码相机图像进行了分类。将遥感衍生的专题图与光探测与测距（LIDAR）高程数据进行交叉引用，以计算相对于潮汐高程的沼泽高程的频率分布。在北入口，以互花米草（Spartina alterniflora）为主的盐沼的中位高程相对于1988年北美垂直基准面（NAVD88）为0.349 m，而平均高水位为0.618 m（2001年至2003年5月），平均潮汐范围1.39 m。 Spartina生境在其垂直范围内的海拔高度分布是正常的，并且80％的盐沼位于0.22 m至0.481 m的窄范围内。属于准Jun尔沼泽的地区，以准Jun尔为主，分布偏斜较宽，分布的80％在0.296 m至0.981 m之间，中位高程为0.519 m。 juncus沼泽发生在微咸沼泽的潮间带区域和盐沼的上部边缘。北入口的斯巴蒂娜（Spartina）沼泽的相对海拔与最近的工作一致，该工作预测平衡海拔随海平面上升速率的增加而降低，这表明这里的沼泽跟不上海平面上升的速度。在过去的二十年里水平上升。

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