World Soil Organic Carbon 0-200cm

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 200cm. This layer averages most likely interpolated carbon mass from soilgrids.org to estimate a value for the top 200cm 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 200cm, or 10% carbon by mass. A 0 to 30cm 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 Read more in our blogs: Dsicoveries and Revelations: Exploring the World Soils 250m Layers Getting Started with Multidimensional Soil Layers in the ArcGIS Living Atlas of the World 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 200cm depth, we used a weighted average using the six mean layers of soil organic carbon, weighted as follows: ((0-5cm * 1) + (5-15cm * 2) + (15-30cm * 3) + (30-60cm * 6) + (60-100cm * 8) + (100-200cm * 20))/ 40 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) + (30-60cm * 6) + (60-100cm * 8) + (100-200cm * 20)) / 400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200厘米深度范围内各点位最可能的碳含量均值。本图层通过对soilgrids.org各分层的最可能插值碳质量数据取平均，估算0至200厘米深度的土壤碳含量值。soilgrids.org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，即十分之一克），本图层已按ArcGIS世界生活地图集（ArcGIS Living Atlas of the World）要求转换为克每千克（g/kg）。例如，本图层中数据集取值为100时，代表该250米分辨率像素内0至200厘米深度的每千克土壤中含有100克碳，即碳质量占比为10%。此外，本图层还提供0至30厘米深度的对应版本。 映射变量：每千克土壤中的碳含量（克/千克，g/kg） 数据投影：古德霍姆洛辛（陆地）投影，WKID 54052 拼接投影：古德霍姆洛辛（陆地）投影，WKID 54052 覆盖范围：全球（南极洲除外） 像元大小：250米 源类型：科学数据 可见比例尺：全比例尺可见 数据来源：SoilGrids.org 发布日期：2021年6月14日 更多详情可参阅以下博客文章： 《探索全球250米分辨率土壤图层：发现与启示》 《ArcGIS世界生活地图集中多维土壤图层快速入门》 所有分析均在ArcGIS Pro中基于soilgrids.org原生的古德霍姆洛辛（陆地）投影完成。数据通过ArcGIS Image for ArcGIS Online以相同投影格式发布。 为得到0至200厘米深度的土壤有机碳含量，我们采用加权平均法对六层土壤有机碳均值图层进行加权计算，权重分配如下： ((0-5cm * 1) + (5-15cm * 2) + (15-30cm * 3) + (30-60cm * 6) + (60-100cm * 8) + (100-200cm * 20)) / 40 由于原始数据单位为分克/千克（整数格式），需转换为克/千克（32位浮点格式），因此实际计算公式调整为： (0-5cm + (5-15cm * 2) + (15-30cm * 3) + (30-60cm * 6) + (60-100cm * 8) + (100-200cm * 20)) / 400