Ground Cover Reference Sites Database of Tasmania

The Ground Cover Reference Sites Database of Tasmania has been collected by Department of Primary Industries, Parks, Water and Environment, Tasmania as part of the Ground Cover Monitoring for Australia project. The data is being used to calibrate, validate and improve vegetation fractional cover products derived from remote sensing, in particular the satellite sensors MODIS and Landsat. The data is being used to improve the national fractional vegetation cover product of Guerschman et al. (2009) derived from the Moderate Resolution Imaging Spectroradiometer (MODIS). This algorithm enables national, monthly identification of ground cover separating the photosynthetic and non-photosynthetic components by applying a linear unmixing methodology for spectral reflectance every 8 days as 16-day composites. For confidence in its ground cover estimates, the results were verified in the field at selected sites across Australia to allow more extensive calibration, validation and verification of accuracy of the remote sensing method. The Ground Cover Reference Sites Database represents the results of the field validation of remotely determined cover measurements by observing cover along point intersects with a total of 300 points (or 200 points with crops). It also has additional observations and measures such as landscape features, fire evidence, erosion evidence, biotic disturbance evidence, biomass estimates, basal area measurements, soil features and dominant vegetation species, as well as site photographs. The Ground Cover Reference Sites Database focuses on sites in extensive grazing systems of the rangelands and, to a lesser extent, in the mixed farming or intensive land use zone. Field validation aims at obtaining a wide spatial coverage of sites, with limited site revisits for temporal coverage. Please use the following URL to access the dataset: http://aekos.org.au/collection/gov.au/abares/gcrs_TAS

塔斯马尼亚地表覆盖参考站点数据库（Ground Cover Reference Sites Database）由塔斯马尼亚州初级产业、公园、水资源与环境部收集，作为“澳大利亚地表覆盖监测”项目的组成部分。该数据集被用于校准、验证并改进由遥感技术反演得到的植被覆盖分数产品，涉及的卫星传感器包括MODIS与Landsat。该数据还被用于优化Guerschman等人于2009年提出的、基于中分辨率成像光谱辐射计（Moderate Resolution Imaging Spectroradiometer，MODIS）反演得到的国家尺度植被覆盖分数产品。该算法针对光谱反射率采用线性解混方法，以16天合成的方式每8天开展一次处理，可实现全国尺度的月度地表覆盖识别，区分光合与非光合植被组分。为保障地表覆盖估算结果的可靠性，研究团队在澳大利亚全境选定站点开展野外验证，以实现遥感反演方法的更广泛校准、验证与精度核查。塔斯马尼亚地表覆盖参考站点数据库收录了野外验证的核心成果：通过沿点样线观测覆盖状况，共采集300个采样点（农田区域则为200个采样点），以此验证遥感反演得到的覆盖度测量结果。该数据库还包含额外的观测与测量项，例如景观特征、火灾痕迹、侵蚀迹象、生物干扰证据、生物量估算值、基径测量数据、土壤特征以及优势植被物种，同时收录了站点实拍照片。该数据库的研究重点为牧区粗放放牧系统中的站点，同时也涵盖少量混合农业或集约土地利用区域的站点。本次野外验证旨在实现站点的广域空间覆盖，并通过有限的站点重访来获取时间维度上的覆盖数据。请通过以下网址获取该数据集：http://aekos.org.au/collection/gov.au/abares/gcrs_TAS