GlobBiomass dataset of forest biomass, South America S (25 m)

The dataset consists of a map of above ground forest biomass (AGB, unit: tons/ha i.e., Mg/ha) of the South American region (between 60°S and 10°S) for the year 2010 (raster dataset) with a pixel size of 25 m x 25 m. AGB is defined as the mass, expressed as oven-dry weight of the woody parts (stem, bark, branches and twigs) of all living trees excluding stump and roots. Per-pixel estimates of above-ground biomass uncertainty expressed as standard error in Mg/ha (raster dataset) are also provided. The AGB estimates were obtained from spaceborne SAR (ALOS PALSAR, Envisat ASAR), optical (Landsat-7), LiDAR (ICESAT), auxiliary datasets with multiple estimation procedures (Santoro et al., ESSD, 2021). In this repository, the AGB data are available in form of tiles of 2° x 2° (bounding box: longitude -180°E/-26°E latitude: -60°N/-10°N). This dataset is the basis for the official GlobBiomass dataset consisting of global estimates of forest biomass with 1 ha pixels (https://doi.pangaea.de/10.1594/PANGAEA.894711). The dataset in this repository represents the original GlobBiomass dataset of AGB from which the official dataset was obtained after averaging from 25 m to 100 m. Given the lower accuracy of the 25 m pixel-based estimates, it is recommended to use the official GlobBiomass dataset unless detailed spatial resolution is a fundamental asset. Technical specifications are provided in the file README_GLOBBIOMASS_South_America_S_20210428.pdf本数据集包含2010年南美区域（南纬60°至南纬10°之间）的地上森林生物量（Above Ground Biomass，简称AGB，单位：吨/公顷即Mg/ha）栅格数据，像素尺寸为25 m × 25 m。AGB定义为所有活立木不含伐桩与根系的木质部分（树干、树皮、枝条及细枝）的烘干重量。本数据集同时提供以标准误差表征的每像素地上生物量不确定性估值（单位：Mg/ha），同样为栅格数据集。AGB估值通过星载合成孔径雷达（Synthetic Aperture Radar，SAR，包含ALOS PALSAR、Envisat ASAR）、光学遥感影像（Landsat-7）、激光雷达（Light Detection and Ranging，LiDAR，即ICESAT）及辅助数据集，结合多种估测方法生成（Santoro等，《地球系统科学数据》(ESSD)，2021）。本仓库中的AGB数据以2°×2°瓦片形式提供，其边界框为：经度-180°E~-26°E，纬度-60°N~-10°N。本数据集是官方GlobBiomass数据集的基础，该数据集包含全球尺度1公顷分辨率的森林生物量估值（https://doi.pangaea.de/10.1594/PANGAEA.894711）。本仓库中的数据集为原始GlobBiomass地上生物量数据集，官方数据集是将该原始数据从25 m分辨率重采样至100 m并取平均后得到的。鉴于基于25 m像素的估值精度较低，除非精细空间分辨率为核心需求，否则建议使用官方GlobBiomass数据集。技术规格详见文件README_GLOBBIOMASS_South_America_S_20210428.pdf。