Google Earth Engine（GEE）——土壤网格250m v2.0
Google Earth Engine（GEE）——土壤网格250m v2.0
土壤网格250m v2.0 SoilGrids被设计成一个全球一致的、以数据为导向的系统，使用全球协变量和全球拟合模型预测土壤属性和类别。如果您正在寻找国家和/或地方层面的土壤信息，我们建议将SoilGrids的预测与来自国家和地方土壤地理数据库的土壤图进行比较。国家土壤地图通常基于更详细的输入土壤信息，因此通常比SoilGrids更准确（在当地覆盖区域内）。关于国家和地区土壤数据库的概述，请参考《土壤地理数据库汇编》。平均值 "和 "中位数（0.5四分位数）"都可以作为特定单元的土壤属性的预测值。平均值代表 "预期值"，并提供土壤属性的无偏预测。
Name | Description | Mapped units | Conversion factor | Conventional units | Assets on GEE |
|---|---|---|---|---|---|
bdod | Bulk density of the fine earth fraction | cg/cm³ | 100 | kg/dm³ | bdod_mean |
cec | Cation Exchange Capacity of the soil | mmol©/kg | 10 | cmol©/kg | cec_mean |
cfvo | Volumetric fraction of coarse fragments (> 2 mm) | cm3/dm3 (vol‰) | 10 | cm3/100cm3 (vol%) | cfvo_mean |
clay | Proportion of clay particles (< 0.002 mm) in the fine earth fraction | g/kg | 10 | g/100g (%) | clay_mean |
nitrogen | Total nitrogen (N) | cg/kg | 100 | g/kg | nitrogen_mean |
phh2o | Soil pH | pHx10 | 10 | pH | phh2o_mean |
sand | Proportion of sand particles (> 0.05 mm) in the fine earth fraction | g/kg | 10 | g/100g (%) | sand_mean |
silt | Proportion of silt particles (≥ 0.002 mm and ≤ 0.05 mm) in the fine earth fraction | g/kg | 10 | g/100g (%) | silt_mean |
soc | Soil organic carbon content in the fine earth fraction | dg/kg | 10 | g/kg | soc_mean |
ocd | Organic carbon density | hg/dm³ | 10 | kg/dm³ | ocd_mean |
ocs | Organic carbon stocks | t/ha | 10 | kg/m² | ocs_mean |
文献引用：
var isric_bdod_mean = ee.Image("projects/soilgrids-isric/bdod_mean");
var isric_cec = ee.Image("projects/soilgrids-isric/cec_mean");
var isric_cfvo = ee.Image("projects/soilgrids-isric/cfvo_mean");
var isric_clay = ee.Image("projects/soilgrids-isric/clay_mean");
var isric_sand = ee.Image("projects/soilgrids-isric/sand_mean");
var isric_silt = ee.Image("projects/soilgrids-isric/silt_mean");
var isric_nitrogen = ee.Image("projects/soilgrids-isric/nitrogen_mean");
var isric_phh20 = ee.Image("projects/soilgrids-isric/phh2o_mean");
var isric_soc = ee.Image("projects/soilgrids-isric/soc_mean");
var isric_ocd = ee.Image("projects/soilgrids-isric/ocd_mean");
var isric_ocs = ee.Image("projects/soilgrids-isric/ocs_mean");
//print example image metadata and description
print(sand_mean)
//Add all layer to Map
Map.addLayer(sand_mean.select('sand_0-5cm_mean'),{min: 50, max: 1000,palette: ['5d5851','635a4b','6a5b44','715c3d','785e36','7e5f30','856129','8c6222','92641c','996515','a0660e','a66808','ad6901']},'SoilGrids250m 2.0 - Sand content ISRIC_0_5cm')
//Set basemap to Hybrid view
Map.setOptions('HYBRID')Data available from¶
Publication date¶
2020-05-04
Period¶
Fri Mar 31 1905 19:00:00 GMT-0500 Mon Jul 04 2016 20:00:00 GMT-0400
Provided by :¶
International Soil Reference and Information Centre (ISRIC)
License¶
Attribution 4.0 International (CC BY 4.0)
DOI¶
Created and Curated by: International Soil Reference and Information Centre (ISRIC)
Keywords: For example Global Soilgrid, Sandy Soil, ISRIC
Last updated: 2020-10-20
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