State Vegetation Type Map (SVTM) Modelling Grid Collection

The SVTM Modelling Grid Collection refers to a suite of around 80 environmental layers that are used for species distribution modelling (SDM). Environmental layers comprise climate, terrain and soil variables for the state of NSW. Layers are used as covariates for the modelling of plant community types within NSW.\r\n\r\nClimate variables, such as annual temperature, precipitation, solar radiation and others are generated by ANUCLIM (Version 6.1 MTHCLIM module), and the Bureau of Meteorology, Gridded climate data (http://www.bom.gov.au/climate/averages/climatology/gridded-data-info/gridded-climate-data.shtml). ANUCLIM input includes a digital elevation model - the elevation model used for these climate surfaces was the 1 second smoothed DEMS from the Shuttle Radar Topographic Mission (SRTM DEM-S see Gallant et al. 2011). The same DEM was used to create topographic variables, such as slope, aspect, roughness and topographic position index. Soil variables, such as clay, sand, silt content, organic carbon, pH, total nitrogen, and others are products of the Soil and Landscape Grid of Australia's, Australia-wide Soil Attribute Maps (https://www.clw.csiro.au/aclep/soilandlandscapegrid/ProductDetails-SoilAttributes.html). Soil attributes are modelled from measured soil attribute data from existing databases in the national soil site data collation and environmental parameters. \r\n\r\nAll grids have a common projection, grid cell resolution and snapped to the same spatial extent. The grid cell resolution is 1 second or approximately 30m.\r\n\r\n_NOTE: This asset does not refer to a distinct layer, rather a collection of related environmental datasets used for vegetation modelling as part of the State Vegetation Type Map Modelling Grid Collection. This list of environmental datasets is attached as a resource. Further information can be found at https://www.environment.nsw.gov.au/vegetation/state-vegetation-type-map.htm._\r\n

SVTM建模网格数据集合集（SVTM Modelling Grid Collection）指代一套包含约80个环境图层（environmental layers）的数据集，用于物种分布建模（Species Distribution Modelling, SDM）。该环境图层集涵盖新南威尔士州（New South Wales, NSW）的气候、地形与土壤变量，可作为协变量用于该州内植物群落类型的建模工作。

气候变量（如年平均气温、降水量、太阳辐射等）由ANUCLIM（版本6.1 MTHCLIM模块）与澳大利亚气象局（Bureau of Meteorology）的网格化气候数据生成，相关数据来源网址为http://www.bom.gov.au/climate/averages/climatology/gridded-data-info/gridded-climate-data.shtml。ANUCLIM的输入数据包含数字高程模型（Digital Elevation Model, DEM）：用于生成上述气候表面的高程模型，源自航天飞机雷达地形测绘任务（Shuttle Radar Topographic Mission, SRTM）的1秒平滑DEM（SRTM DEM-S，详见Gallant等人2011年的研究）。同一DEM还被用于生成各类地形变量，包括坡度、坡向、地表粗糙度及地形位置指数。

土壤变量（如黏粒、砂粒、粉粒含量、有机碳、pH值、全氮等）均源自澳大利亚土壤与景观网格（Soil and Landscape Grid of Australia）的全国土壤属性图集，相关数据详情网址为https://www.clw.csiro.au/aclep/soilandlandscapegrid/ProductDetails-SoilAttributes.html。土壤属性通过现有数据库中的实测土壤属性数据，结合全国土壤样点数据整合与环境参数进行建模得到。

所有环境图层均采用统一的投影坐标系、网格分辨率，且对齐至相同的空间范围；网格分辨率为1秒，约合30米。

注意：本数据集并非指单一独立图层，而是作为州植被类型图建模网格数据集合集（State Vegetation Type Map Modelling Grid Collection）的组成部分、用于植被建模的相关环境数据集集合。该环境数据集清单已作为附属资源附上，更多详细信息可访问https://www.environment.nsw.gov.au/vegetation/state-vegetation-type-map.htm.