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由塔斯马尼亚州初级产业、公园、水资源与环境部采集，作为“澳大利亚地表覆盖监测”项目的组成部分。该数据被用于校准、验证并优化通过遥感技术（尤其是MODIS与陆地卫星（Landsat）搭载的传感器）反演得到的植被盖度（Fractional Cover）产品；同时被用于改进Guerschman等人（2009）基于中分辨率成像光谱仪（Moderate Resolution Imaging Spectroradiometer, MODIS）反演得到的国家尺度植被盖度产品。该算法通过针对光谱反射率采用线性解混方法（Linear Unmixing），以每8天为周期生成16天合成影像，进而可实现全国范围内逐月区分光合与非光合地表覆盖组分。为保障地表盖度估算结果的可靠性，研究团队在澳大利亚全境选取典型站点开展野外验证，以对遥感反演方法的精度开展更全面的校准、验证与校核。塔斯马尼亚地表覆盖参考站点数据库记录了野外验证的实测结果：通过沿样点交点观测地表覆盖情况，共设置300个标准观测点（农田区域设置200个观测点）。该数据库还包含多项额外观测与测量指标，涵盖景观特征、火灾痕迹、侵蚀痕迹、生物干扰证据、生物量估算值、基径测量值、土壤特征、优势植被物种，以及站点实拍照片。该数据库的监测重点为牧场广域放牧系统中的站点，同时也少量覆盖混合农业或集约土地利用区域。野外验证工作旨在实现站点的广泛空间覆盖，仅通过有限的站点重访来获取时间序列覆盖数据。请通过以下链接获取该数据集：http://aekos.org.au/collection/gov.au/abares/gcrs_TAS