Soil and Landscape Grid National Soil Attribute Maps - Total Phosphorus (3" resolution) - Release 1

This is Version 1 of the Australian Soil Total Phosphorus product of the Soil and Landscape Grid of Australia. \n\nThe Soil and Landscape Grid of Australia has produced a range of digital soil attribute products. Each product contains six digital soil attribute maps, and their upper and lower confidence limits, representing the soil attribute at six depths: 0-5cm, 5-15cm, 15-30cm, 30-60cm, 60-100cm and 100-200cm. These depths are consistent with the specifications of the GlobalSoilMap.net project (http://www.globalsoilmap.net/). The digital soil attribute maps are in raster format at a resolution of 3 arc sec (~90 x 90 m pixels). \n\nThese maps are generated by combining the best available Digital Soil Mapping (DSM) products available across Australia. \n\nAttribute Definition: Total phosphorus; \nUnits: %; \nPeriod (temporal coverage; approximately): 1950-2013; \nSpatial resolution: 3 arc seconds (approx 90m); \nTotal number of gridded maps for this attribute: 18; \nNumber of pixels with coverage per layer: 2007M (49200 * 40800); \nTotal size before compression: about 8GB; \nTotal size after compression: about 4GB; \nData license : Creative Commons Attribution 4.0 (CC BY); \nTarget data standard: GlobalSoilMap specifications; \nFormat: GeoTIFF.\nLineage: The National Soil Attribute Maps are generated by combining the best available digital soil mapping to calculate a variance weighted mean for each pixel. For this soil attribute the Australia-wide three-dimensional Digital Soil Property Maps are the only maps available. Thus the modelling for this soil attribute only used Decision trees with piecewise linear models with kriging of residuals developed from soil site data across Australia. (Viscarra Rossel et al., 2015a).

本数据集为澳大利亚土壤与景观网格（Soil and Landscape Grid of Australia）发布的澳大利亚土壤全磷产品的V1版本。

澳大利亚土壤与景观网格（Soil and Landscape Grid of Australia）已研制多套数字化土壤属性产品。每套产品包含六张数字化土壤属性图及其置信上下限，分别对应0-5cm、5-15cm、15-30cm、30-60cm、60-100cm及100-200cm六个深度层的土壤属性数值。上述深度分层标准与GlobalSoilMap.net项目（http://www.globalsoilmap.net/）的规范完全一致。该系列数字化土壤属性图采用栅格格式，空间分辨率为3角秒（约90×90米像素）。

本系列土壤图通过整合澳大利亚境内现有最优的数字化土壤制图（Digital Soil Mapping, DSM）产品生成。

属性定义：全磷（Total phosphorus）；单位：%；时间覆盖范围（近似）：1950年-2013年；空间分辨率：3角秒（约90米）；该属性的栅格地图总数：18张；单图层覆盖像素数：2007M（即49200×40800）；压缩前总大小：约8GB；压缩后总大小：约4GB；数据许可协议：知识共享署名4.0（Creative Commons Attribution 4.0, CC BY）；目标数据标准：GlobalSoilMap规范；数据格式：GeoTIFF。

数据谱系说明：国家级土壤属性图通过整合最优数字化土壤制图方法生成，对每个像素计算方差加权均值。针对该土壤属性，目前仅可获取覆盖全澳大利亚的三维数字化土壤属性图。因此，本土壤属性的建模仅采用了分段线性模型结合决策树，并对澳大利亚境内土壤样点数据的残差进行克里金插值（Viscarra Rossel等，2015a）。