Seagrass time-series analysis products, in Moreton Bay, Australia, with links to GeoTIFFs

This study uses two high temporal resolution time-series of thematic seagrass cover maps to examine the spatial and temporal dynamics of seagrass at both an inter- and intra-annual time scales, one of the first globally to do so at this scale. Previous work by the authors developed an object-based approach to map seagrass cover level distribution from a long term archive of Landsat TM and ETM+ images on the Eastern Banks (~200 km**2), Moreton Bay, Australia. In this work a range of trend and time-series analysis methods are demonstrated for a time-series of 23 annual maps from 1988 to 2010 and a time-series of 16 monthly maps during 2008-2010. Significant new insight was presented regarding the inter- and intra-annual dynamics of seagrass persistence over time, seagrass cover level variability, seagrass cover level trajectory, and change in area of seagrass and cover levels over time.

本研究采用两套高时间分辨率的专题海草覆盖度时序地图，旨在探究海草在年际与年内时间尺度上的时空动态特征，此为全球范围内首批在此尺度上开展此类研究的工作之一。本研究团队此前已开发出一种面向对象的方法，依托澳大利亚莫顿湾东滩（约200平方千米）区域的长期Landsat TM与ETM+影像档案，完成海草覆盖度等级分布的制图工作。本研究针对1988年至2010年的23幅年度海草覆盖度地图时序序列，以及2008年至2010年间的16幅月度海草覆盖度地图时序序列，展示了一系列趋势分析与时序分析方法。本研究针对海草随时间的年际与年内持久性动态、海草覆盖度等级变异性、海草覆盖度等级变化轨迹，以及海草面积与覆盖度等级随时间的变化等议题，提出了具有重要学术价值的全新见解。