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

This is Version 1 of the Australian Soil Sand 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: 200 μm - 2 mm mass fraction of the less than 2 mm soil material determined using the pipette method; \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.\n\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. Two DSM methods have been utilised across and in various parts of Australia, these being: \n\n1) Decision trees with piecewise linear models with kriging of residuals developed from soil site data across Australia. (Viscarra Rossel et al., 2015a); \n2) Disaggregation of existing polygon soil mapping using DSMART (Odgers et al. 2015a). \n\nVersion 1 of the National Digital Soil Property Maps combines mapping from the: \n\n1) Australia-wide three-dimensional Digital Soil Property Maps; \n2) Western Australia Polygon Disaggregation Maps; \n3) South Australian Agricultural Areas Polygon Disaggregation Maps; \n4) Tasmanian State-wide DSM Maps. \n\nThese individual mapping products are also available in the Data Access Portal. Please refer to these individual products for more detail on the DSM methods used.