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全球土壤信息Soilgrids250m产品的最新版本（v2.0）数据库

此星光明发表于 2023/03/03 17:47:49 2023/03/03

【摘要】 HiHydroSoil v2.0层2020年5月，ISRIC发布了其Soilgrids250m产品的最新版本（v2.0）。这一版本使FutureWater能够用更新的、更精确的、具有更高分辨率的土壤数据来更新其HiHydroSoil v1.2数据库，这导致了HiHydroSoil v2.0的开发和发布。土壤信息是所有环境研究的基础。由于当地通常没有高质量的土壤图，因此使用了低分辨率的全球...

HiHydroSoil v2.0层
2020年5月，ISRIC发布了其Soilgrids250m产品的最新版本（v2.0）。这一版本使FutureWater能够用更新的、更精确的、具有更高分辨率的土壤数据来更新其HiHydroSoil v1.2数据库，这导致了HiHydroSoil v2.0的开发和发布。

土壤信息是所有环境研究的基础。由于当地通常没有高质量的土壤图，因此使用了低分辨率的全球土壤图。此外，土壤地图不包括土壤水力特性的信息，而这些信息在水文建模、水土流失评估和作物产量建模等方面具有重要意义。HiHydroSoil v2.0可以填补这一数据空白。HiHydroSoil v2.0包括以下数据，其他信息以及下载数据的链接可以在这里找到

有机质含量
土壤质地等级
饱和导水率
Mualem van Genuchten参数Alpha和N
饱和含水量
剩余水含量
pF2、pF3和pF4.2的含水量
水文土壤组(USDA)
水文土壤组（HSG）决定了径流曲线号，在水文模型中经常用来估计降雨的直接径流。四个水文土壤组和三个双重水文土壤组。原本由浮动数据类型组成的数据层被乘以10,000的系数，随后转换为整数类型。因此需要通过乘以0.0001将数据转换为合适的单位。

文献引用：

Simons, G.W.H., R. Koster, P. Droogers. 2020. HiHydroSoil v2.0 - A high resolution soil map of global hydraulic properties.FutureWater Report 213.

代码：

var hydrologic_soil_group = ee.Image('projects/sat-io/open-datasets/HiHydroSoilv2_0/Hydrologic_Soil_Group_250m');

var ksat = ee.ImageCollection("projects/sat-io/open-datasets/HiHydroSoilv2_0/ksat");
var satfield = ee.ImageCollection("projects/sat-io/open-datasets/HiHydroSoilv2_0/sat-field");
var N = ee.ImageCollection("projects/sat-io/open-datasets/HiHydroSoilv2_0/N");
var alpha = ee.ImageCollection("projects/sat-io/open-datasets/HiHydroSoilv2_0/alpha");
var crit_wilt = ee.ImageCollection("projects/sat-io/open-datasets/HiHydroSoilv2_0/crit-wilt"),
var field_cirt = ee.ImageCollection("projects/sat-io/open-datasets/HiHydroSoilv2_0/field-crit");
var ormc = ee.ImageCollection("projects/sat-io/open-datasets/HiHydroSoilv2_0/ormc");
var stc = ee.ImageCollection("projects/sat-io/open-datasets/HiHydroSoilv2_0/stc");
var wcavail = ee.ImageCollection("projects/sat-io/open-datasets/HiHydroSoilv2_0/wcavail");
var wcpf2 = ee.ImageCollection("projects/sat-io/open-datasets/HiHydroSoilv2_0/wcpf2");
var wcpf3 = ee.ImageCollection("projects/sat-io/open-datasets/HiHydroSoilv2_0/wcpf3");
var wcpf4_2 = ee.ImageCollection("projects/sat-io/open-datasets/HiHydroSoilv2_0/wcpf4-2");
var wcres = ee.ImageCollection("projects/sat-io/open-datasets/HiHydroSoilv2_0/wcres");
var wcsat = ee.ImageCollection("projects/sat-io/open-datasets/HiHydroSoilv2_0/wcsat");


var palettes = require('users/gena/packages:palettes');

Map.addLayer(ksat.first().multiply(0.0001),{min:2,max:415,palette:palettes.cmocean.Delta[7]},'ksat')
Map.addLayer(satfield.first().multiply(0.0001),{min:0.25,max:0.55,palette:palettes.cmocean.Haline[7]},'sat-field',false)
Map.addLayer(N.first().multiply(0.0001),{min:1,max:1.5,palette:palettes.cmocean.Thermal[7]},'N',false)
Map.addLayer(alpha.first().multiply(0.0001),{min:0.006,max:0.074,palette:palettes.cmocean.Solar[7]},'alpha',false)
Map.addLayer(wilt_perm.first().multiply(0.0001),{min:0.04,max:0.14,palette:palettes.cmocean.Gray[7]},'Perm-wilt',false)
Map.addLayer(field_wilt.first().multiply(0.0001),{min:0.02,max:0.27,palette:palettes.cmocean.Oxy[7]},'field-wilt',false)
Map.addLayer(ormc.first().multiply(0.0001),{min:0.48,max:14,palette:palettes.cmocean.Deep[7]},'ormc',false)
Map.addLayer(stc.first().multiply(0.0001),{min:0.0003,max:0.0006,palette:palettes.cmocean.Haline[7]},'stc',false)
Map.addLayer(wcavail.first().multiply(0.0001),{min:0.132,max:0.353,palette:palettes.cmocean.Dense[7]},'wcavail',false)
Map.addLayer(wcpf2.first().multiply(0.0001),{min:0.25,max:0.55,palette:palettes.cmocean.Algae[7]},'wcpf2',false)
Map.addLayer(wcpf3.first().multiply(0.0001),{min:0.10,max:0.327,palette:palettes.cmocean.Delta[7]},'wcfp3',false)
Map.addLayer(wcpf4_2.first().multiply(0.0001),{min:0.05,max:0.19,palette:palettes.cmocean.Haline[7]},'wcpf4_2',false)

文献直接下载链接：

https://www.futurewater.nl/wp-content/uploads/2020/10/HiHydroSoil-v2.0-High-Resolution-Soil-Maps-of-Global-Hydraulic-Properties.pdf

Raster Value Map¶

ClassValue	Hydrologic Soil Group
1	A (low runoff potential when thoroughly wet) water transmitted freely
2	B (moderately low runoff when thoroughly wet) transmission unimpeded
3	C (moderately high Runoff when thoroughly wet) transmission somewhat restricted
4	D (High Runoff potential when thoroughly wet) water movement restricted
14	A/D Dual hydrologic group soils with 60cm from surface. First letter drained condition, second undrained condition
24	B/D Dual hydrologic group soils with 60cm from surface. First letter drained condition, second undrained condition
34	C/D Dual hydrologic group soils with 60cm from surface. First letter drained condition, second undrained condition

代码链接: https://code.earthengine.google.com/4da512c4c0785ef2767f159028579fc6

https://code.earthengine.google.com/?scriptPath=users/sat-io/awesome-gee-catalog-examples:soil-properties/HiHYDRO-SOIL-LAYERS

Variable	Unit	Description	Range	Assets on GEE
Organic Matter Content (ORMC)	%	Soil organic matter (SOM) is the organic matter component of soil, consisting of plant and animal detritus at various stages of decomposition, cells and tissues of soil microbes, and substances that soil microbes synthesize.	0 - 50	ormc
Soil Texture Class (STC)	O (Organic), VF (Very Fine), F (Fine), MF (Medium Fine), C (Coarse), M (Medium)	Soil texture is a classification instrument used both in the field and laboratory to determine soil classes based on their physical texture.	1- 6 (see column Unit)	stc
Alpha parameter for Mualem Van Genuchten Equation (ALPHA)	1/cm	The shape of water retention curves can be characterized by several models, one of them known as the van Genuchten model. The Alpha parameter in this model is related to the inverse of the air entry suction.	0 - 0.2	alpha
N parameter for Mualem Van Genuchten Equation (N)	-	The shape of water retention curves can be characterized by several models, one of them known as the van Genuchten model. The N parameter in this model is a measure of the pore-size distribution.	1 - 2.3	N
Saturated Water Content (Wcsat)	m3/m3	Saturated water content is the maximum amount of water a soil can store and which is equivalent to the porosity of the soil.	0.25 - 0.85	wcsat
Residual Water Content (Wcres)	m3/m3	The residual volumetric water content represents the volumetric water content of a soil where a further increase in negative pore-water pressure does not produce significant changes in water content.	0 - 0.02	wcres
Saturated Hydraulic Conductivity (Ksat)	cm/d	Saturated hydraulic conductivity is a quantitative measure of a saturated soil's ability to transmit water when subjected to a hydraulic gradient. It can be thought of as the ease with which pores of a saturated soil permit water movement.	0 - 1500	ksat
Water content at pF2 (field capacity) (WCpF2)	m3/m3	Field Capacity is the amount of soil moisture or water content held in the soil after excess water has drained away and the rate of downward movement has decreased. It's the upper limit of the rapidly available water for plants at a matric potential of -100 cm or pF2.	0 - 0.8	wcpf2
Water content at pF3 (critical point) (WCpF3)	m3/m3	Critical point: lower limit of rapidly available water for plants. Upper limit of slowly available water for plants. This is at a matric potential of -1000 cm or pF3.	0 - 0.7	wcpf3
Water content at pF4.2 (permanent wilting point) (WCpF4.2)	m3/m3	Plants can - on average - produce a suction till 16 x atmospheric pressure before a plants starts to permanently wilt. This atmosperic pressures is similar to a matrix potentential of -16000 cm, or pF 4.2.	0 - 0.7	wcpf4-2
Available water content (Wcavail)	m3/m3	The amount of water between field capacity (pF2) and permanent wilting point (pF4.2). This value should be used with caution. First, plants will start wilting with subsequent yield losses well before the permanent wilting point. Secondly, plant available soil water is replenished by capillary rise, rainfall and irrigation water.	0 - 0.6	wcavail
Water content between saturation point and field capacity (pF2) (SAT_FIELD)	m3/m3	Water content between saturation point and field capacity (pF2)	…	sat-field
Water content between field capacity (pF2) and critical point (pF3) (FIELD-CRIT)	m3/m3	Water content between field capacity (pF2) and critical point (pF3)	0 - 0.4	field-crit
Water content between critical point (pF3) and permanent wilting point (pF4.2) (CRIT-WILT)	m3/m3	Water content between critical point (pF3) and permanent wilting point (pF4.2)	0 - 0.25	crit-wilt
Hydrologic Soil Group	A (low runoff potential), A/D, B (moderately low runoff potential), B/D, C (moderately high runoff potential), C/D, D (high runoff potential)	Along with land use, land management practices and soil hydrologic conditions the Hydrologic Soil Group (HSG) determines the Runoff Curve Number which is often used in hydrological modelling to estimate the direct runoff from rainfall. Four hydrologic soil groups and three dual hydrologic soil groups are described by the USDA (2009)		hydrologic-soil-group