Ground Cover Reference Sites Database of Queensland

The Ground Cover Reference Sites Database of Queensland has been collected by Department of Environment and Science, Queensland 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_Qld

昆士兰州地表覆盖参考站点数据库由昆士兰州环境与科学部（Department of Environment and Science, Queensland）作为“澳大利亚地表覆盖监测”项目的组成部分收集构建。该数据被用于校准、验证并改进遥感反演得到的植被覆盖度产品，尤其是基于中分辨率成像光谱仪（MODIS）与陆地卫星（Landsat）传感器的反演产品。该数据还被用于改进Guerschman等人（2009年）基于中分辨率成像光谱仪（MODIS）反演得到的国家尺度植被覆盖度产品。该算法采用线性光谱解混方法处理光谱反射率，以每8天观测数据生成16天合成产品，从而实现全国尺度的月度光合与非光合地表覆盖组分识别。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布设野外验证站点，以完成遥感反演方法的更全面校准、验证及精度核验工作。昆士兰州地表覆盖参考站点数据库收录了遥感反演覆盖测量结果的野外验证数据，即通过沿样点交点观测地表覆盖情况采集得到，总计包含300个样点（农田类站点为200个样点）。该数据库同时收录了额外的观测与测量项，包括景观特征、火灾痕迹、侵蚀痕迹、生物干扰痕迹、生物量估算值、基径面积测量值、土壤特征及优势植被物种，此外还包含站点实拍照片。该数据库聚焦于牧区粗放放牧系统中的站点，同时少量覆盖混合农业或集约土地利用区域的站点。野外验证工作以实现站点的广域空间覆盖为目标，通过有限的站点重访来获取时间序列覆盖数据。请通过以下链接访问该数据集：http://aekos.org.au/collection/gov.au/abares/gcrs_Qld