World Soil Organic Carbon 0-30cm

This layer estimates the mean of the most likely interpolated values of carbon content for every from soilgrids.org SOC layer to a depth of 30cm. This layer averages most likely interpolated carbon mass from soilgrids.org to estimate a value for the top 30cm of soil. Soilgrids.org soil organic carbon datasets are expressed as mass in tenths of a gram (decigrams) per kilogram of soil overall. This has been converted to grams per kilogram for the Living Atlas. For example, in this layer, a value of 100 in the dataset means there is 100g of carbon every kilogram of soil in the 250m pixel to a depth of 30cm, or 10% carbon by mass. A 0 to 200cm depth version of this layer is also available. Variable mapped: grams of carbon per kilogram of soil (g/kg) Data Projection: Goode's Homolosine (land) WKID 54052 Mosaic Projection: Goode's Homolosine (land) WKID 54052 Extent: World, except Antarctica Cell Size: 250 m Source Type: Scientific Visible Scale: All scales are visible Source: SoilGrids.org Publication Date: June 14, 2021 All analysis was done in soilgrids.org own Goode's Homolosine projection (land) in ArcGIS Pro. The data were served in this same projection in ArcGIS Image for ArcGIS Online. To determine the soil organic carbon to 30cm depth, we used a weighted average using the top three mean layers of soil organic carbon, weighted as follows: ((0-5cm * 1) + (5-15cm * 2) + (15-30cm * 3))/ 6 The output is actually converted from decigrams per kilogram (integers) to grams per kilogram (32 bit floating point) so the following formula was used: (0-5cm + (5-15cm * 2) + (15-30cm * 3)) / 60本图层针对soilgrids.org发布的土壤有机碳（Soil Organic Carbon, SOC）各分层数据，插值计算得到0至30厘米深度土层的最可能碳含量均值。本图层通过对soilgrids.org的碳质量最可能插值结果取平均，估算0至30厘米表层土壤的碳含量数值。 soilgrids.org的土壤有机碳数据集原始单位为每千克土壤中碳的质量（单位：分克（decigram, dg）），本数据集已为Living Atlas转换为克每千克（g/kg）。 例如本图层中，数据集数值100即代表250米分辨率像元内0至30厘米土层的每千克土壤含碳100克，即质量占比为10%。另有0至200厘米深度版本的该图层可供使用。 映射变量：每千克土壤中的碳质量（克/千克，g/kg） 数据投影：古德Homolosine（陆地）投影（Goode's Homolosine (land)），WKID 54052 镶嵌投影：古德Homolosine（陆地）投影（Goode's Homolosine (land)），WKID 54052 覆盖范围：全球（南极洲除外） 像元尺寸：250米 源数据类型：科学数据 显示比例尺：全比例尺可见 数据来源：SoilGrids.org 发布日期：2021年6月14日 所有分析均在ArcGIS Pro中使用soilgrids.org自带的古德Homolosine（陆地）投影完成，数据以相同投影格式通过ArcGIS Image for ArcGIS Online发布。 为得到0至30厘米深度的土壤有机碳含量，我们采用加权平均法，使用三层土壤有机碳均值图层，加权规则如下：((0-5cm * 1) + (5-15cm * 2) + (15-30cm * 3))/6 最终输出结果已从原始的分克每千克（整数格式）转换为克每千克（32位浮点格式），转换公式为：(0-5cm + (5-15cm * 2) + (15-30cm * 3)) / 60