Ground Cover Reference Sites Database of Tasmania

The Ground Cover Reference Sites Database of Tasmaniahas been collected by Department of Primary Industries, Parks, Water and Environment, Tasmaniaas 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 evey 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 of Tasmania）由塔斯马尼亚州第一产业、公园、水利与环境部采集，系"澳大利亚地表覆盖监测"项目的组成部分。
本数据可用于校准、验证并优化遥感反演得到的植被覆盖度产品，尤其针对中分辨率成像光谱仪（Moderate Resolution Imaging Spectroradiometer，简称MODIS）与陆地卫星（Landsat）传感器的反演产品。该数据同时被用于优化Guerschman等人2009年基于MODIS构建的国家尺度植被覆盖度产品。
该算法针对光谱反射率数据采用线性解混方法，将每8天的观测数据合成为16天合成产品，以此实现全国尺度的逐月地表覆盖识别，区分光合与非光合覆盖组分。为保障地表覆盖估算结果的可信度，研究团队在澳大利亚全境选取站点开展野外验证，以实现遥感反演方法精度的更全面校准、验证与确认。
塔斯马尼亚地表覆盖参考站点数据库通过沿样线交叉点布设测点，共收集300个测点（农田区域为200个测点）的覆盖度观测数据，以此完成对遥感反演覆盖度测量值的野外验证。数据库还包含额外的观测与测量项，涵盖景观特征、火灾痕迹、侵蚀痕迹、生物干扰痕迹、生物量估算值、断面积测量数据、土壤特征以及优势植被物种，同时附带站点实拍照片。
本数据库以牧区大范围放牧系统的站点为核心研究对象，同时兼顾少量混合农业或集约土地利用区域的站点。野外验证工作旨在实现站点的广域空间覆盖，并通过有限的站点重访获取时间维度的覆盖度数据。
请通过以下链接获取本数据集：http://aekos.org.au/collection/gov.au/abares/gcrs_TAS