3  Database description

Database description

Variable names, types, measurement units, analytical methods, and plain-language descriptions for all fields in the OSSL database. Use the tabs to browse each data type, the search box to find a specific variable, and click the + button on any row to expand its full details.

Showing 86 variables

	OSSL CODE	DESCRIPTION	OSSL UNIT	DATA TYPE
	dataset.code_ascii_txt	OSSL dataset code	txt	string
Full description Dataset code used for internal reference OSSL method ascii Unit description text Example value AFSIS1.SSL OSSL abbreviation dataset.code
	id.layer_uuid_txt	OSSL unique identifier	txt	string
Full description Unique identifier OSSL method uuid Unit description text Example value ded584d70bf0474202d30e575ae24784 OSSL abbreviation id.layer
	acidity_usda.a795_cmolc.kg	Acidity, BaCl2-TEA Extractable, pH 8.2	cmolc.kg	numeric
Full description Extractable acidity, BaCl2-TEA at pH 8.2, is a measure of the amount of acid neutralized at a set pH OSSL method usda.a795 Unit description centimoles of charge per kilogram of soil Example value 0.40000 OSSL abbreviation acidity
	aggstb_usda.a1_w.pct	Aggregate Stability	w.pct	numeric
Full description Aggregate stability is the weight percent of 0.5 mm - 2 mm aggregates remaining after wet sieving. OSSL method usda.a1 Unit description weight percent Example value 74 OSSL abbreviation aggstb
	al.dith_usda.a65_w.pct	Aluminum, Crystalline, Total Pedogenic Iron	w.pct	numeric
Full description Dithionite citrate extractable aluminum is an indicator of the amount of aluminum substituted for iron in iron oxides. OSSL method usda.a65 Unit description weight percent Example value 0.13652 OSSL abbreviation al.dith
	al.ext_aquaregia_g.kg	Aluminum, Extractable, Aqua Regia	g.kg	numeric
Full description Near-total aluminium recovered by aqua regia (HCl:HNO3) digestion - a pseudo-total measure OSSL method aquaregia Unit description grams per kilogram of soil Example value 42.9620831 OSSL abbreviation al.ext
	al.ext_usda.a1056_mg.kg	Aluminum, Extractable, Mehlich3	mg.kg	numeric
Full description Aluminium extracted by the Mehlich-3 multi-nutrient solution; an index of reactive Al in acidic-to-neutral soils. OSSL method usda.a1056 Unit description miligrams per kilogram of soil Example value 1270.00000 OSSL abbreviation al.ext
	al.ext_usda.a69_cmolc.kg	Aluminum, Extractable, KCl	cmolc.kg	numeric
Full description Exchangeable aluminium displaced by 1 M KCl - the standard measure of exchangeable (acidity-related) Al in acidic soils. OSSL method usda.a69 Unit description centimoles of charge per kilogram of soil Example value 0.20000 OSSL abbreviation al.ext
	al.ox_usda.a59_w.pct	Aluminum, Amorphous, Total Non-Crystalline Iron	w.pct	numeric
Full description Ammonium oxalate extractable aluminum is an estimate of the total pedogenic Al, much of which may be in noncrystalline materials or complexed by organic matter. OSSL method usda.a59 Unit description weight percent Example value 0.12951 OSSL abbreviation al.ox
	awc.33.1500kPa_usda.c80_w.frac	Available Water Content, Difference 33-1500 kPa	w.frac	numeric
Full description The amount (fraction) of water released between 1/3 (33 kPa) and 15 (1500 kPa) bar tensions determined as gravimetric percent. OSSL method usda.c80 Unit description weight fraction Example value 0.08658 OSSL abbreviation awc.33.1500kPa
	b.ext_mel3_mg.kg	Boron, Extractable, Mehlich3	mg.kg	numeric
Full description Plant-available boron extracted by the Mehlich-3 multi-nutrient solution. OSSL method mel3 Unit description miligrams per kilogram of soil Example value 0.00100000 OSSL abbreviation b.ext
	bd_iso.11272_g.cm3	Bulk Density, ISO 11272	g.cm3	numeric
Full description Bulk density of the fine soil and corrected for rock/root fragmens (>2mm) in [g/cm3] for each sample OSSL method iso.11272 Unit description grams per cubic centimeter Example value 1.57100 OSSL abbreviation bd
	bd_usda.a21_g.cm3	Bulk Density, <2 mm fraction, Core	g.cm3	numeric
Full description Bulk density, <2mm fraction, field moist is the weight per unit volume of the <2 mm fraction, with volume measured at field (sampling) moisture. Measurements are made on known volume cores. It is reported as grams per cubic centimeter, <2 mm base. OSSL method usda.a21 Unit description grams per cubic centimeter Example value 1.57100 OSSL abbreviation bd
	bd_usda.a4_g.cm3	Bulk Density, <2mm fraction, Clod	g.cm3	numeric
Full description Bulk density, <2 mm fraction, 1/3 bar is the weight per unit volume of the <2 mm fraction, with volume being measured after equilibration at 1/3 bar water tension. It is reported as grams per cubic centimeter on a <2 mm base. OSSL method usda.a4 Unit description grams per cubic centimeter Example value 1.3477999 OSSL abbreviation bd
	c.tot_iso.10694_w.pct	Carbon, Total NCS, ISO 10694	w.pct	numeric
Full description Total carbon is a measure of all organic and inorganic carbon. Dry combustion. OSSL method iso.10694 Unit description weight percent Example value 3.668778009 OSSL abbreviation c.tot
	c.tot_usda.a622_w.pct	Carbon, Total NCS	w.pct	numeric
Full description Total carbon is a measure of all organic and inorganic carbon, including that found in carbonate minerals. OSSL method usda.a622 Unit description weight percent Example value 1.55128592 OSSL abbreviation c.tot
	ca.ext_aquaregia_mg.kg	Calcium, Extractable, Aqua Regia	mg.kg	numeric
Full description Near-total calcium recovered by aqua regia digestion (pseudo-total), not the exchangeable pool. OSSL method aquaregia Unit description miligrams per kilogram of soil Example value 368.535095 OSSL abbreviation ca.ext
	ca.ext_usda.a1059_mg.kg	Calcium, Extractable, Mehlich3	mg.kg	numeric
Full description Plant-available calcium extracted by the Mehlich-3 multi-nutrient solution (acidic-to-neutral soils). OSSL method usda.a1059 Unit description miligrams per kilogram of soil Example value 78.20000 OSSL abbreviation ca.ext
	ca.ext_usda.a722_cmolc.kg	Calcium, Extractable, NH4OAc	cmolc.kg	numeric
Full description Exchangeable calcium displaced by 1 M ammonium acetate buffered at pH 7.0. OSSL method usda.a722 Unit description centimoles of charge per kilogram of soil Example value 2.617060178 OSSL abbreviation ca.ext
	ca.ext_brazil.ier_cmolc.kg	Calcium, Extractable, Ion Exchange Resin (IER)	cmolc.kg	numeric
Full description Plant-available calcium extracted by the ion-exchange-resin (IER) method commonly used in Brazil. OSSL method brazil.ier Unit description centimoles of charge per kilogram of soil Example value 31 OSSL abbreviation ca.ext
	caco3_iso.10693_w.pct	Carbonate, ISO 10693	w.pct	numeric
Full description Carbonate in the <2mm fraction is measured by CO2 evolution after acid treatment. It is reported as gravimetric percent CaCO3 on a <2 mm base, even though carbonates of Mg, Na, K, and Fe may be present and react with the acid. OSSL method iso.10693 Unit description weight percent Example value 27.0 OSSL abbreviation caco3
	caco3_usda.a54_w.pct	Carbonate, <2mm Fraction	w.pct	numeric
Full description Carbonate in the <2mm fraction is measured by CO2 evolution after acid treatment. It is reported as gravimetric percent CaCO3 on a <2 mm base, even though carbonates of Mg, Na, K, and Fe may be present and react with the acid. OSSL method usda.a54 Unit description weight percent Example value 0.50000 OSSL abbreviation caco3
	cec_iso.11260_cmolc.kg	CEC, BaCl2, soil's own pH, ISO 11260	cmolc.kg	numeric
Full description Cation exchange capacity determined with BaCl₂ at the soil's own pH. It is reported as cmolc kg-1 (= meq per 100 grams) on a <2 mm base. OSSL method iso.11260 Unit description centimoles of charge per kilogram of soil Example value 37.8 OSSL abbreviation cec
	cec_usda.a723_cmolc.kg	CEC, pH 7.0, NH4OAc, 2M KCl displacement	cmolc.kg	numeric
Full description Cation exchange capacity of a sample highly buffered at pH 7.0. It is reported on a <2 mm base. OSSL method usda.a723 Unit description centimoles of charge per kilogram of soil Example value 6.6332171 OSSL abbreviation cec
	cf_iso.11464_w.pct	Coarse Fragments, ISO 11464	w.pct	numeric
Full description The gravimetric percentage of greater than 2 mm diameter particles reported on a whole soil base. OSSL method iso.11464 Unit description weight percent Example value 10 OSSL abbreviation cf
	cf_usda.c236_w.pct	Coarse Fragments, Greater 2mm	w.pct	numeric
Full description The gravimetric percentage of greater than 2 mm diameter particles reported on a whole soil base. OSSL method usda.c236 Unit description weight percent Example value 4.00000 OSSL abbreviation cf
	clay.tot_iso.11277_w.pct	Clay, ISO 11277	w.pct	numeric
Full description Total clay is the soil separate with <0.002 mm particle diameter. Clay size carbonate is included. It is reported on a <2 mm base. OSSL method iso.11277 Unit description weight percent Example value 51 OSSL abbreviation clay.tot
	clay.tot_usda.a334_w.pct	Clay	w.pct	numeric
Full description Total clay is the soil separate with <0.002 mm particle diameter. Clay size carbonate is included. It is reported on a <2 mm base. OSSL method usda.a334 Unit description weight percent Example value 30.99000 OSSL abbreviation clay.tot
	cu.ext_usda.a1063_mg.kg	Copper, Extractable, Mehlich3	mg.kg	numeric
Full description Plant-available copper extracted by the Mehlich-3 multi-nutrient solution. OSSL method usda.a1063 Unit description miligrams per kilogram of soil Example value 0.5600000 OSSL abbreviation cu.ext
	ec_iso.11265_ds.m	Electrical Conductivity, ISO 11265	ds.m	numeric
Full description Electrical conductivity. It is reported of a 1:5 soil:water mixture OSSL method iso.11265 Unit description decisiemens per metre Example value 2.3350 OSSL abbreviation ec
	ec_usda.a364_ds.m	Electrical Conductivity, (w/w)	ds.m	numeric
Full description The salt predict electrical conductivity is used to determine whether additional salt analyses are needed, and to estimate appropriate dilution ratios for additional tests. It is reported as mmhos per centimeter of a 1:2 soil:water mixture by weight. OSSL method usda.a364 Unit description decisiemens per metre Example value 0.03100 OSSL abbreviation ec
	efferv_usda.a479_class	Effervescense, 1N HCl	class	string
Full description The visual effervescence of the prepared sample when treated with 1 N HCl. OSSL method usda.a479 Unit description class of visual interpretation Example value none OSSL abbreviation efferv
	fe.dith_usda.a66_w.pct	Iron, Crystalline, Total Pedogenic Iron	w.pct	numeric
Full description Dithionite citrate extractable iron is considered a general measure of total pedogenic iron. OSSL method usda.a66 Unit description weight percent Example value 1.09028 OSSL abbreviation fe.dith
	fe.ext_aquaregia_g.kg	Iron, Extractable, Aqua Regia	g.kg	numeric
Full description Near-total iron recovered by aqua regia digestion (pseudo-total), distinct from the pedogenic-oxide and available pools. OSSL method aquaregia Unit description grams per kilogram of soil Example value 71.9575342 OSSL abbreviation fe.ext
	fe.ext_usda.a1064_mg.kg	Iron, Extractable, Mehlich3	mg.kg	numeric
Full description Iron extracted by the Mehlich-3 multi-nutrient solution; an index of available/reactive Fe. OSSL method usda.a1064 Unit description miligrams per kilogram of soil Example value 182.00000 OSSL abbreviation fe.ext
	fe.ox_usda.a60_w.pct	Iron, Amorphous, Total Non-Crystalline Iron	w.pct	numeric
Full description Ammonium oxalate extractable iron is considered a measure of the noncrystalline Fe in soils. OSSL method usda.a60 Unit description weight percent Example value 0.15422 OSSL abbreviation fe.ox
	k.ext_aquaregia_mg.kg	Potassium, Extractable, Aqua Regia	mg.kg	numeric
Full description Near-total potassium recovered by aqua regia digestion (pseudo-total), not the exchangeable pool. OSSL method aquaregia Unit description miligrams per kilogram of soil Example value 1781.400966 OSSL abbreviation k.ext
	k.ext_usda.a1065_mg.kg	Potassium, Extractable, Mehlich3	mg.kg	numeric
Full description Plant-available potassium extracted by the Mehlich-3 multi-nutrient solution. OSSL method usda.a1065 Unit description miligrams per kilogram of soil Example value 47.000000 OSSL abbreviation k.ext
	k.ext_usda.a725_cmolc.kg	Potassium, Extractable, NH4OAc, 2M KCl displacement	cmolc.kg	numeric
Full description Exchangeable potassium displaced by 1 M ammonium acetate at pH 7.0 (2 M KCl displacement). OSSL method usda.a725 Unit description centimoles of charge per kilogram of soil Example value 0.200688352 OSSL abbreviation k.ext
	k.ext_msz.20135_mg.kg	Potassium, K2O, Extractable, Ammonium Lactate (AL)	mg.kg	numeric
Full description Potassium Oxide by the ammonium-lactate (AL / Egner-Riehm) method, Hungarian standard MSZ 20135. OSSL method msz.20135 Unit description miligrams per kilogram of soil Example value 103 OSSL abbreviation k.ext
	k.ext_brazil.ier_cmolc.kg	Potassium, Extractable, Ion Exchange Resin (IER)	cmolc.kg	numeric
Full description Plant-available potassium extracted by the ion-exchange-resin (IER) method commonly used in Brazil. OSSL method brazil.ier Unit description centimoles of charge per kilogram of soil Example value 4.7 OSSL abbreviation k.ext
	mg.ext_aquaregia_mg.kg	Magnesium, Extractable, Aqua Regia	mg.kg	numeric
Full description Near-total magnesium recovered by aqua regia digestion (pseudo-total), not the exchangeable pool. OSSL method aquaregia Unit description miligrams per kilogram of soil Example value 710.429099 OSSL abbreviation mg.ext
	mg.ext_usda.a1066_mg.kg	Magnesium, Extractable, Mehlich3	mg.kg	numeric
Full description Plant-available magnesium extracted by the Mehlich-3 multi-nutrient solution. OSSL method usda.a1066 Unit description miligrams per kilogram of soil Example value 19.600000 OSSL abbreviation mg.ext
	mg.ext_usda.a724_cmolc.kg	Magnesium, Extractable, NH4OAc, 2M KCl displacement	cmolc.kg	numeric
Full description Exchangeable magnesium displaced by 1 M ammonium acetate at pH 7.0 (2 M KCl displacement). OSSL method usda.a724 Unit description centimoles of charge per kilogram of soil Example value 1.81655342 OSSL abbreviation mg.ext
	mg.ext_brazil.ier_cmolc.kg	Magnesium, Extractable, Ion Exchange Resin (IER)	cmolc.kg	numeric
Full description Plant-available magnesium extracted by the ion-exchange-resin (IER) method commonly used in Brazil. OSSL method brazil.ier Unit description centimoles of charge per kilogram of soil Example value 35 OSSL abbreviation mg.ext
	mn.ext_aquaregia_mg.kg	Manganese, Extractable, Aqua Regia	mg.kg	numeric
Full description Near-total manganese recovered by aqua regia digestion (pseudo-total), not the exchangeable/available pool. OSSL method aquaregia Unit description miligrams per kilogram of soil Example value 497.300369 OSSL abbreviation mn.ext
	mn.ext_usda.a1067_mg.kg	Manganese, Extractable, Mehlich3	mg.kg	numeric
Full description Plant-available manganese extracted by the Mehlich-3 multi-nutrient solution. OSSL method usda.a1067 Unit description miligrams per kilogram of soil Example value 23.10000000 OSSL abbreviation mn.ext
	mn.ext_usda.a70_mg.kg	Manganese, Extractable, KCl	mg.kg	numeric
Full description Exchangeable manganese displaced by 1 M KCl. OSSL method usda.a70 Unit description miligrams per kilogram of soil Example value 0.62569 OSSL abbreviation mn.ext
	n.tot_iso.11261_w.pct	Nitrogen, Total NCS, ISO 11261	w.pct	numeric
Full description Total nitrogen is a measure of all organic and inorganic nitrogen. OSSL method iso.11261 Unit description weight percent Example value 0.25 OSSL abbreviation n.tot
	n.tot_iso.13878_w.pct	Nitrogen, Total NCS, ISO 13878	w.pct	numeric
Full description Total nitrogen is a measure of all organic and inorganic nitrogen. OSSL method iso.13878 Unit description weight percent Example value 0.089 OSSL abbreviation n.tot
	n.tot_usda.a623_w.pct	Nitrogen, Total NCS, usda.a623	w.pct	numeric
Full description Total nitrogen is a measure of all organic and inorganic nitrogen, including that found in nitrogen minerals. OSSL method usda.a623 Unit description weight percent Example value 0.079766974 OSSL abbreviation n.tot
	na.ext_aquaregia_mg.kg	Sodium, Extractable, Aqua Regia	mg.kg	numeric
Full description Near-total sodium recovered by aqua regia digestion (pseudo-total), not the exchangeable pool. OSSL method aquaregia Unit description miligrams per kilogram of soil Example value 75.986312 OSSL abbreviation na.ext
	na.ext_usda.a1068_mg.kg	Sodium, Extractable, Mehlich3	mg.kg	numeric
Full description Sodium extracted by the Mehlich-3 multi-nutrient solution. OSSL method usda.a1068 Unit description miligrams per kilogram of soil Example value 17.800000 OSSL abbreviation na.ext
	na.ext_usda.a726_cmolc.kg	Sodium, Extractable, NH4OAc, 2M KCl displacement	cmolc.kg	numeric
Full description Exchangeable sodium displaced by 1 M ammonium acetate at pH 7.0 (2 M KCl displacement). OSSL method usda.a726 Unit description centimoles of charge per kilogram of soil Example value 0.124398521 OSSL abbreviation na.ext
	oc_iso.10694_w.pct	Organic Carbon, ISO 10694	w.pct	numeric
Full description Estimated Organic Carbon based on Total C OSSL method iso.10694 Unit description weight percent Example value 2.05000000 OSSL abbreviation oc
	oc_usda.c1059_w.pct	Organic Carbon, Total C without CaCO3, N prep	w.pct	numeric
Full description Estimated Organic Carbon based on Total C, N prep. OSSL method usda.c1059 Unit description weight percent Example value 1.50336492 OSSL abbreviation oc
	oc_usda.c729_w.pct	Organic Carbon, Total C without CaCO3, S prep	w.pct	numeric
Full description Estimated Organic Carbon based on Total C, S prep. OSSL method usda.c729 Unit description weight percent Example value 2.9100 OSSL abbreviation oc
	oc_wb1934_w.pct	Organic Carbon, Walkley-Black method, 1934	w.pct	numeric
Full description Organic carbon determined by Walkley-Black wet oxidation OSSL method wb1934 Unit description weight percent Example value 1.54 OSSL abbreviation oc
	p.ext_aquaregia_mg.kg	Phosphorus, Extractable, Aqua Regia	mg.kg	numeric
Full description Near-total phosphorus recovered by aqua regia digestion (pseudo-total), not the plant-available pool. OSSL method aquaregia Unit description miligrams per kilogram of soil Example value 608.30492 OSSL abbreviation p.ext
	p.ext_iso.11263_mg.kg	Phosphorus, Extractable, ISO 11263	mg.kg	numeric
Full description Plant-available phosphorus soluble in sodium bicarbonate (Olsen-type), per ISO 11263. OSSL method iso.11263 Unit description miligrams per kilogram of soil Example value 72.4 OSSL abbreviation p.ext
	p.ext_usda.a1070_mg.kg	Phosphorus, Extractable, Mehlich3	mg.kg	numeric
Full description Plant-available phosphorus by Mehlich-3 extraction. OSSL method usda.a1070 Unit description miligrams per kilogram of soil Example value 3.44739 OSSL abbreviation p.ext
	p.ext_usda.a270_mg.kg	Phosphorus, Extractable, Bray1	mg.kg	numeric
Full description Plant-available phosphorus by the Bray-1 (dilute HCl-NH4F) method; suited to acidic soils. OSSL method usda.a270 Unit description miligrams per kilogram of soil Example value 50.5348939 OSSL abbreviation p.ext
	p.ext_usda.a274_mg.kg	Phosphorus, Extractable, Olsen	mg.kg	numeric
Full description Plant-available phosphorus by the Olsen sodium-bicarbonate method; the standard for calcareous/alkaline soils. OSSL method usda.a274 Unit description miligrams per kilogram of soil Example value 17.23518992 OSSL abbreviation p.ext
	p.ext_usda.a652_mg.kg	Phosphorus, Extractable, Mehlich3	mg.kg	numeric
Full description Plant-available phosphorus by Mehlich-3 extraction. OSSL method usda.a652 Unit description miligrams per kilogram of soil Example value 9.770000 OSSL abbreviation p.ext
	p.ext_msz.20135_mg.kg	Phosphorus, Extractable, Ammonium Lactate (AL)	mg.kg	numeric
Full description Plant-available phosphorus by the ammonium-lactate (AL / Egner-Riehm) method, Hungarian standard MSZ 20135. OSSL method msz.20135 Unit description miligrams per kilogram of soil Example value 55.9 OSSL abbreviation p.ext
	p.ext_austria.cal_mg.kg	Phosphorus, Extractable, Calcium-Acetate-Lactate (CAL)	mg.kg	numeric
Full description Plant-available phosphorus by the calcium-acetate-lactate (CAL) method, 0.01 M CaCl2 at a soil-to-solution ratio of 1 : 5.An Austrian/German standard. OSSL method austria.cal Unit description miligrams per kilogram of soil Example value 125 OSSL abbreviation p.ext
	p.ext_brazil.ier_mg.kg	Phosphorus, Extractable, Ion Exchange Resin (IER)	mg.kg	numeric
Full description Plant-available phosphorus extracted by the ion-exchange-resin (IER) method commonly used in Brazil. OSSL method brazil.ier Unit description miligrams per kilogram of soil Example value 17 OSSL abbreviation p.ext
	ph.cacl2_usda.a477_index	pH, 1:2 Soil-CaCl2 Suspension, 0.01 M CaCl2	index	numeric
Full description pH of a sample measured in 0.01 M CaCl2 at a 1:2 soil:solution ratio. OSSL method usda.a477 Unit description negative logarithm of the hydrogen ion concentration Example value 5.40 OSSL abbreviation ph.cacl2
	ph.cacl2_iso.10390_index	pH, 1:5 Soil-CaCl2 Suspension, ISO 10390	index	numeric
Full description pH of a sample measured in 0.01 M CaCl2 at a 1:5 soil:solution ratio. OSSL method iso.10390 Unit description negative logarithm of the hydrogen ion concentration Example value 7.24 OSSL abbreviation ph.cacl2
	ph.cacl2_usda.a481_index	pH, 1:2 Soil-CaCl2 Suspension	index	numeric
Full description pH of a sample measured in 0.01 M CaCl2 at a 1:2 soil:solution ratio. OSSL method usda.a481 Unit description negative logarithm of the hydrogen ion concentration Example value 6.40000 OSSL abbreviation ph.cacl2
	ph.h2o_iso.10390_index	pH, 1:5 Soil-Water Suspension, ISO 10390	index	numeric
Full description pH of the sample measyred in 1:5 soil:water suspension. OSSL method iso.10390 Unit description negative logarithm of the hydrogen ion concentration Example value 7.64 OSSL abbreviation ph.h2o
	ph.h2o_usda.a268_index	pH, 1:1 Soil-Water Suspension	index	numeric
Full description pH of the sample measured in 1:1 soil:water suspension. OSSL method usda.a268 Unit description negative logarithm of the hydrogen ion concentration Example value 5.10000 OSSL abbreviation ph.h2o
	s.ext_mel3_mg.kg	Sulphur, Extractable, Mehlich3	mg.kg	numeric
Full description Plant-available sulphur extracted by the Mehlich-3 multi-nutrient solution. OSSL method mel3 Unit description miligrams per kilogram of soil Example value 16.800 OSSL abbreviation s.ext
	s.tot_usda.a624_w.pct	Sulfur, Total NCS	w.pct	numeric
Full description Total sulfur is a measure of all organic and inorganic sulfur, including that found in sulfide minerals. OSSL method usda.a624 Unit description weight percent Example value 0.03569 OSSL abbreviation s.tot
	sand.tot_iso.11277_w.pct	Sand, Total, ISO 11277	w.pct	numeric
Full description Total sand is the soil separate with 0.05 to 2.0 mm particle diameter. It is reported on a <2 mm base. OSSL method iso.11277 Unit description weight percent Example value 9 OSSL abbreviation sand.tot
	sand.tot_usda.c405_w.pct	Sand, Total, N prep	w.pct	numeric
Full description Total sand is the soil separate with 0.05 to 2.0 mm particle diameter. It is reported on a <2 mm base. OSSL method usda.c405 Unit description weight percent Example value 79.4 OSSL abbreviation sand.tot
	sand.tot_usda.c60_w.pct	Sand, Total, S prep	w.pct	numeric
Full description Total sand is the soil separate with 0.05 to 2.0 mm particle diameter. It is reported on a <2 mm base. OSSL method usda.c60 Unit description weight percent Example value 50.37000 OSSL abbreviation sand.tot
	silt.tot_iso.11277_w.pct	Silt, Total, ISO 11277	w.pct	numeric
Full description Total silt is the soil separate with 0.002 to 0.05 mm particle size. It is reported on a <2 mm base. OSSL method iso.11277 Unit description weight percent Example value 40 OSSL abbreviation silt.tot
	silt.tot_usda.c407_w.pct	Silt, Total, N prep	w.pct	numeric
Full description Total silt is the soil separate with 0.002 to 0.05 mm particle size. It is reported on a <2 mm base. OSSL method usda.c407 Unit description weight percent Example value 18.2 OSSL abbreviation silt.tot
	silt.tot_usda.c62_w.pct	Silt, Total, S prep	w.pct	numeric
Full description Total silt is the soil separate with 0.002 to 0.05 mm particle size. It is reported on a <2 mm base. OSSL method usda.c62 Unit description weight percent Example value 18.64000 OSSL abbreviation silt.tot
	wr.10kPa_usda.a414_w.pct	Water Retention, 1/10 Bar (10 kPa)	w.pct	numeric
Full description The gravimetric percent water after equilibration at 1/10 bar (10 kPa) water tension. OSSL method usda.a414 Unit description weight percent Example value 10.852961 OSSL abbreviation wr.10kPa
	wr.10kPa_usda.a8_w.pct	Water Retention, 1/10 Bar (10 kPa), Clod	w.pct	numeric
Full description The gravimetric percent water after equilibration at 1/10 bar (10 kPa) water tension. OSSL method usda.a8 Unit description weight percent Example value 23.00000 OSSL abbreviation wr.10kPa
	wr.1500kPa_usda.a417_w.pct	Water Retention, 15 Bar (1500 kPa)	w.pct	numeric
Full description The gravimetric percent water after equilibration at 15 bar (1500 kPa) water tension. OSSL method usda.a417 Unit description weight percent Example value 3.000000 OSSL abbreviation wr.1500kPa
	wr.33kPa_usda.a415_w.pct	Water Retention, 1/3 Bar (33 kPa)	w.pct	numeric
Full description The gravimetric percent water after equilibration at 1/3 bar (33 kPa) water tension. OSSL method usda.a415 Unit description weight percent Example value 29.17023 OSSL abbreviation wr.33kPa
	wr.33kPa_usda.a9_w.pct	Water Retention, 1/3 Bar (33 kPa), Clod	w.pct	numeric
Full description The gravimetric percent water after equilibration at 1/3 bar (33 kPa) water tension. OSSL method usda.a9 Unit description weight percent Example value 18.20000 OSSL abbreviation wr.33kPa
	zn.ext_usda.a1073_mg.kg	Zinc, Extractable, Mehlich3	mg.kg	numeric
Full description Plant-available zinc extracted by the Mehlich-3 multi-nutrient solution. OSSL method usda.a1073 Unit description miligrams per kilogram of soil Example value 1.0300000 OSSL abbreviation zn.ext

Showing 98 variables

	OSSL CODE	DESCRIPTION	DATA TYPE
	dataset.code_ascii_txt	OSSL dataset code	string
Example value AFSIS1.SSL
	id.layer_uuid_txt	OSSL unique identifier	string
Example value ded584d70bf0474202d30e575ae24784
	id.layer_local_c	Original observation identifier	string
Example value icr072246
	longitude.point_wgs84_dd	Longitude in decimal degrees (WGS84, EPSG 4326)	numeric
Example value 15.6874916700
	latitude.point_wgs84_dd	Latitude in decimal degrees (WGS84, EPSG 4326)	numeric
Example value -7.37775000
	layer.sequence_usda_uint16	Layer sequence (incremented in depth)	numeric
Example value 1
	layer.upper.depth_usda_cm	Layer top depth in cm	numeric
Example value 0.0
	layer.lower.depth_usda_cm	Layer bottom depth in cm	numeric
Example value 20.0
	observation.date.begin_iso.8601_yyyy.mm.dd	Begin date of observation following YYYY-MM-DD format (ISO 8601)	numeric
Example value 2011-01-01
	observation.date.end_iso.8601_yyyy.mm.dd	End date of observation following YYYY-MM-DD format (ISO 8601)	numeric
Example value 2013-12-31
	surveyor.title_utf8_txt	Field surveyor name or organization	string
Example value L.T.Desta
	id.project_ascii_txt	Project name	string
Example value Africa Soil Information Service (AfSIS-1)
	id.location_olc_txt	Unique Open Location Code with a precision of 6 decimal places in point coordinates	string
Example value 6F4QJMCP+VX
	layer.texture_usda_txt	Texture description based on USDA classification	string
Example value sand
	pedon.taxa_usda_txt	Soil classification based on the USDA Keys to Soil Taxonomy	string
Example value Typic Kanhaplustalf
	horizon.designation_usda_txt	Soil horizon based on the USDA Keys to Soil Taxonomy	string
Example value Ap
	longitude.county_wgs84_dd	County centroid, longitude in decimal degrees (WGS84, EPSG 4326)	numeric
Example value -96.688800
	latitude.county_wgs84_dd	County centroid, latitude in decimal degrees (WGS84, EPSG 4326)	numeric
Example value 40.78446
	location.point.error_any_m	Approximate point location error in m	numeric
Example value 30
	location.country_iso.3166_txt	Country code following ISO 3166	string
Example value NZL
	observation.ogc.schema.title_ogc_txt	Observation OGC schema title	string
Example value Open Soil Spectroscopy Library
	observation.ogc.schema_idn_url	Observation OGC schema url	string
Example value https://soilspectroscopy.github.io
	surveyor.contact_ietf_email	Surveyor contact email	string
Example value afsis.info@africasoils.net
	surveyor.address_utf8_txt	Surveyor or institution address	string
Example value ICRAF, PO Box 30677, Nairobi, 00100, Kenya
	dataset.title_utf8_txt	Dataset name	string
Example value Africa Soil Information Service (AfSIS-1)
	dataset.owner_utf8_txt	Name of of organization or person that is the responsible for the dataset	string
Example value ICRAF, CROPNUTS, RRES
	dataset.address_idn_url	URL address of the dataset web page	string
Example value https://www.isric.org/explore/ISRIC-collections
	dataset.doi_idf_url	Digital object identifier (DOI) url of the dataset	string
Example value https://doi.org/10.1016/j.geodrs.2015.06.002
	dataset.license.title_ascii_txt	Dataset license	string
Example value ODC Open Database License
	dataset.license.address_idn_url	Dataset license url	string
Example value https://opendatacommons.org/licenses/odbl/
	dataset.contact.name_utf8_txt	Dataset contact name	string
Example value Keith Shepherd
	dataset.contact_ietf_email	Dataset contact email	string
Example value afsis.info@africasoils.net
	id.dataset.site_ascii_txt	Site identification	string
Example value 203
	dataset.contributor_src_code	Code identifying the dataset contributor as provided by the source.	string
Example value EGCO
	id.biogeo_src_txt	Identifier for the biogeochemistry sample. NEON	string
Example value 11_KLEMME_PIT1_31-46_BIOGEO_CR2
	id.kssl.lay_local_txt	Local layer identifier from KSSL.	string
Example value 135
	id.kssl.smp_local_txt	Local sample identifier from KSSL.	string
Example value 200121
	id.loc_src_txt	Sample location identifier as provided by the source.	string
Example value yol_s0_mcmc
	id.period_src_txt	Sampling period identifier as provided by the source.	string
Example value Time-zero
	id.presentation_src_txt	Identifier indicating how the sample is presented (e.g. Instrument average). Neospectra.	string
Example value Instrument average
	id.sample_local_c	Local sample code identifier.	string
Example value S40892
	id.site_src_txt	Site identifier as provided by the source.	string
Example value FR380/10
	id.site.name_src_txt	Site name identifier as provided by the source.	string
Example value Mangatoa
	id.treatment_src_txt	Treatment identifier as provided by the source.	string
Example value 3
	id.trial_src_txt	Trial identifier as provided by the source.	string
Example value FR380
	layer.bottom.depth_usda_cm	Bottom depth of the soil layer in centimeters following the USDA convention.	numeric
Example value 25
	loc.country_src_code	Country code as provided by the source (typically ISO 3166-1 alpha-3).	string
Example value COD
	loc.country_src_txt	Country name as provided by the source.	string
Example value Tanzania
	loc.env.zone_src_txt	Environmental zone as provided by the source.	string
Example value Continental
	loc.experiment_src_txt	Experiment identifier within the location as provided by the source.	string
Example value 1
	loc.field_src_txt	Field identifier as provided by the source.	string
Example value 1
	loc.fips.code	FIPS (Federal Information Processing Standard) code identifying a US administrative area.	string
Example value 53041
	loc.municipality_src_code	Municipality code as provided by the source.	string
Example value 40101
	loc.municipality_src_txt	Municipality name as provided by the source.	string
Example value Nova Mutum MT
	loc.province_src_txt	Province name as provided by the source.	string
Example value Tshuapa
	loc.region_src_txt	Region name as provided by the source.	string
Example value East Africa
	loc.state_src_txt	State name as provided by the source.	string
Example value Mato Grosso
	loc.subdiv.name_src_txt	Administrative subdivision name as provided by the source.	string
Example value Djolu
	loc.subdiv.type_src_txt	Administrative subdivision type (e.g. district	string
Example value Territoire
	observation.date_src_yyy.mm.dd	Observation date as provided by the source (YYYY-MM-DD; note the column name uses three 'y' characters — likely a typo for yyyy.mm.dd).	string
Example value 1317945600
	observation.date_src_yyyy	Observation year (4-digit) as provided by the source.	integer
Example value 2016
	observation.date_src_yyyy.mm.dd	Observation date as provided by the source in YYYY-MM-DD format.	string
Example value 1459382400
	observation.source_src_txt	Origin or source of the observation as provided by the source.	string
Example value Long term experiment
	observation.type_src_txt	Type of observation or sampling method (e.g. auger drilling) as provided by the source.	string
Example value Auger
	pedon.horizon_src_txt	Soil horizon designation as provided by the source.	string
Example value CR2
	pedon.horizon_usda_txt	Soil horizon designation following USDA Soil Taxonomy.	string
Example value E
	pedon.taxa_src_txt	Soil taxonomic classification as provided by the source.	string
Example value Andosol
	pedon.taxa_wrb_code	Soil taxonomic classification code following the World Reference Base (WRB).	string
Example value FL
	pedon.taxa_wrb_txt	Soil taxonomic classification name following the World Reference Base (WRB).	string
Example value Chromic Luvisol
	site.alt_src_m	Site altitude in meters as provided by the source.	numeric
Example value 445
	site.altitude_src_m	Site altitude in meters as provided by the source (duplicate concept of site.alt_src_m — consider harmonizing).	numeric
Example value 500
	site.aspect_src_deg	Site slope aspect in degrees (compass direction the slope faces) as provided by the source.	numeric
Example value 270
	site.biome_src_txt	Biome classification at the site as provided by the source.	string
Example value Cerrado
	site.clim.koeppen_src_code	Köppen-Geiger climate classification code as provided by the source.	string
Example value Csa
	site.cluster_src_id	Cluster identifier grouping nearby sites as provided by the source.	string
Example value 16
	site.crop_src_txt	Crop grown at the site as provided by the source.	string
Example value cassava
	site.cultivated_src_logical	Whether the site is cultivated (TRUE/FALSE) as provided by the source.	logical
Example value FALSE
	site.domain_src_txt	Ecological or administrative domain code at the site as provided by the source.	string
Example value D11
	site.elevation_src_m	Site elevation in meters above sea level as provided by the source.	numeric
Example value 636.67511
	site.forest_src_txt	Forest type at the site as provided by the source.	string
Example value lowland primary forest
	site.geology_src_txt	Geological description of the site as provided by the source.	string
Example value Sedimentary Rock
	site.id_src_txt	Site identifier as provided by the source.	string
Example value AB1
	site.land.history_src_txt	Land use history at the site as provided by the source.	string
Example value 5 yr, after staple crops
	site.land.use_src_code	Land use code at the site as provided by the source.	string
Example value Gr
	site.land.use_src_txt	Land use description at the site as provided by the source.	string
Example value Arable land
	site.landuse2009_src_code	Land use code at the site for year 2009 as provided by the source.	string
Example value B11
	site.landuse2012_src_code	Land use code at the site for year 2012 as provided by the source.	string
Example value F10
	site.landuse2015_src_code	Land use code at the site for year 2015 as provided by the source.	string
Example value E20
	site.location.use_src_txt	Description combining site location and land use as provided by the source.	string
Example value D. Peščara-arable
	site.name_src_txt	Site name as provided by the source.	string
Example value Itende
	site.physiography_src_txt	Physiographic description of the site (landform position) as provided by the source.	string
Example value face
	site.pit_src_txt	Soil pit identifier as provided by the source.	string
Example value 11_KLEMME_PIT1
	site.pit.name_src_txt	Soil pit name as provided by the source.	string
Example value MEGAPT100986
	site.plot_src_id	Plot identifier within the site as provided by the source.	string
Example value 7
	site.slope_src_deg	Site slope steepness in degrees as provided by the source.	numeric
Example value 5
	site.slope.shape_src_txt	Slope shape at the site (e.g. convex	string
Example value convex
	site.species_src_txt	Plant species at the site as provided by the source.	string
Example value Pinus radiata
	site.vegetation_src_txt	Vegetation description at the site as provided by the source.	string
Example value Areas of Ecological Tension

Middle-infrared (MIR) spectra is provided in absorbance units per wavenumber, with values usually ranging between 0 and 3. The spectral range imported into the OSSL falls between 600 and 4000 cm^-1, with an interval of 2 cm^-1. All datasets are standardized to this specification.

One can convert reflectance (R) values to absorbance units (A) as A = log10(1/R), or backtransform with R = 1/(10^A). Similarly, headers containing wavenumbers (WN, in cm^-1) can be converted to wavelength (WL, in nm) with WL = 1/(WN/10000000), or backtransformed with WN = 1/(WL/10000000). The factor 10M is used to convert cm to nm.

Showing 15 variables

	OSSL CODE	DESCRIPTION	DATA TYPE
	id.layer_uuid_txt	OSSL unique identifier	string
Example value 8585028b0344511c951fc0298b5ab3a8
	id.scan_local_c	Original scan identifier	string
Example value icr021044
	scan.mir.date.begin_iso.8601_yyyy.mm.dd	Begin date of scanning following YYYY-MM-DD format (ISO 8601)	numeric
Example value 2009-01-01
	scan.mir.date.end_iso.8601_yyyy.mm.dd	Begin date of scanning following YYYY-MM-DD format (ISO 8601)	numeric
Example value 2013-12-31
	scan.mir.model.name_utf8_txt	MIR instrument manufacturer, model and accessory (if any)	string
Example value Bruker Tensor 27 with HTS-XT accessory
	scan.mir.model.code_any_txt	MIR instrument coding	string
Example value Bruker_Tensor_27.HTS.XT
	scan.mir.method.optics_any_txt	Metadata information related to instrument optics and measurements	string
Example value KBr beamsplitter; DTGS detector
	scan.mir.method.preparation_any_txt	Soil sample preparation before scanning	string
Example value Finely ground <80 mesh
	scan.mir.license.title_ascii_txt	Dataset scans license	string
Example value CC-BY
	scan.mir.license.address_idn_url	Dataset scans license url	string
Example value https://creativecommons.org/licenses/by/4.0/
	scan.mir.doi_idf_url	Digital object identifier (DOI) url of the dataset scans	string
Example value https://doi.org/10.34725/DVN/QXCWP1
	scan.mir.contact.name_utf8_txt	Dataset scans contact name	string
Example value Vagen, Tor-Gunnar (World Agroforestry)
	scan.mir.contact.email_ietf_txt	Dataset scans contact email	string
Example value afsis.info@africasoils.net
	scan_mir.600_abs	Absorbance in log10 unit, first wavenumber in the 600-4000 cm-1 range	numeric
Example value 1.38812
	scan_mir.4000_abs	Absorbance in log10 unit, last wavenumber in the 600-4000 cm-1 range	numeric
Example value 0.2452604

Visible and Near-Infrared (VisNIR) spectra is provided in reflectance units per wavelength, with values usually ranging between 0 and 1 as fraction percent. The spectral range imported into the OSSL falls between 350 and 2500 nm, with an interval of 2 nm. All datasets are standardized to this specification.

One can convert reflectance (R) values to absorbance units (A) as A = log10(1/R), or backtransform with R = 1/(10^A). Similarly, headers containing wavenumbers (WN, in cm^-1) can be converted to wavelength (WL, in nm) with WL = 1/(WN/10000000), or backtransformed with WN = 1/(WL/10000000). The factor 10M is used to convert cm to nm.

Showing 15 variables

	OSSL CODE	DESCRIPTION	DATA TYPE
	id.layer_uuid_txt	OSSL unique identifier	string
Example value bb01d3da0ea0d4d796b3391bb1d174f1
	id.scan_local_c	Original scan identifier	string
Example value 196784MD01
	scan.visnir.date.begin_iso.8601_yyyy.mm.dd	Begin date of scanning following YYYY-MM-DD format (ISO 8601)	numeric
Example value 2015-03-05
	scan.visnir.date.end_iso.8601_yyyy.mm.dd	Begin date of scanning following YYYY-MM-DD format (ISO 8601)	numeric
Example value 2015-03-05
	scan.visnir.model.name_utf8_txt	VisNIR instrument manufacturer, model and accessory (if any)	string
Example value ASD Labspec 2500 with Muglight accessory
	scan.visnir.model.code_any_txt	VisNIR instrument coding	string
Example value ASD_Labspec_2500_MA
	scan.visnir.method.optics_any_txt	Metadata information related to instrument optics and measurements	string
Example value 4.5 W halogen lamp
	scan.visnir.method.preparation_any_txt	Soil sample preparation before scanning	string
Example value Sieved <2 mm
	scan.visnir.license.title_ascii_txt	Dataset scans license	string
Example value CC-BY
	scan.visnir.license.address_idn_url	Dataset scans license url	string
Example value https://www.nrcs.usda.gov/resources/data-and-reports/rapid-carbon-assessment-raca
	scan.visnir.doi_idf_url	Digital object identifier (DOI) url of the dataset scans	string
Example value https://doi.org/10.1007/978-3-319-04084-4_10
	scan.visnir.contact.name_utf8_txt	Dataset scans contact name	string
Example value Scarlett Murphy
	scan.visnir.contact.email_ietf_txt	Dataset scans contact email	string
Example value Scarlett.Murphy@usda.gov
	scan_visnir.350_ref	Reflectance in fraction unit, first wavelength in the 350-2500 nm range	numeric
Example value 0.10403320
	scan_visnir.2500_ref	Reflectance in fraction unit, last wavelength in the 350-2500 nm range	numeric
Example value 0.3622029

Near-Infrared (NIR) spectra from the Neospectra handheld instrument is provided in reflectance units per wavelength, typically ranging between 0 and 1. The spectral range imported into the OSSL falls between 700 and 2550 nm, with an interval of 2 nm.

Reflectance (R) values can be converted to absorbance units (A) using A = log10(1/R), or backtransformed with R = 1/(10^A). Wavelength (WL, in nm) and wavenumber (WN, in cm^-1) are related by WL = 1/(WN/10000000) and WN = 1/(WL/10000000).

Showing 16 variables

	OSSL CODE	DESCRIPTION	DATA TYPE
	id.sample_local_c	Soil sample identifier	string
Example value 30747
	id.scan_local_c	Scan identifier (One average spectra per device)	string
Example value NEO1_030747
	scan.lab_utf8_txt	Scanning laboratory	string
Example value Woodwell
	scan.visnir.date.begin_iso.8601_yyyy.mm.dd	Begin date of scanning following YYYY-MM-DD format (ISO 8601)	string
Example value 1609459200
	scan.visnir.date.end_iso.8601_yyyy.mm.dd	Begin date of scanning following YYYY-MM-DD format (ISO 8601)	string
Example value 1672444800
	scan.nir.model.name_utf8_txt	NIR device code	string
Example value NEO1
	scan.nir.model.serialnumber_utf8_in	NIR device serial number	numeric
Example value 21020033
	scan.nir.accessory.used_utf8_txt	Yes or No for scanning accesory	string
Example value y
	scan.visnir.method.preparation_any_txt	Soil sample preparation before scanning	string
Example value <2 mm
	scan.visnir.license.title_ascii_txt	Dataset scans license	string
Example value CC-BY
	scan.visnir.license.address_idn_url	Dataset scans license url	string
Example value https://creativecommons.org/licenses/by/4.0/
	scan.visnir.doi_idf_url	Digital object identifier (DOI) url of the dataset scans	string
Example value https://doi.org/10.5281/zenodo.7586622
	scan.visnir.contact.name_utf8_txt	Dataset scans contact name	string
Example value Jonathan Sanderman
	scan.visnir.contact.email_ietf_txt	Dataset scans contact email	string
Example value jsanderman@woodwellclimate.org
	scan_nir.1350_ref	Reflectance in fraction unit, first wavelength in the 1350-2550 nm range	numeric
Example value 0.10403320
	scan_nir.2550_ref	Reflectance in fraction unit, last wavelength in the 1350-2550 nm range	numeric
Example value 0.3622029