Neospectra

Neospectra

Near-infrared soil spectral library (Neospectra) from selected KSSL samples (USA) and Africa

VNIR NIR MIR
National — USA, Africa
2,000+ samples second update (v1) CC-BY

Database access

Data originally provided by:

Available files

Type Filename Link
MIR spectra — CSV (gzip) ossl_mir_v1.3.csv.gz Download
MIR spectra — Parquet ossl_mir_v1.3.parquet Download
NIR spectra — CSV (gzip) ossl_nir_v1.3.csv.gz Download
NIR spectra — Parquet ossl_nir_v1.3.parquet Download
Soil lab measurements — CSV (gzip) ossl_soillab_v1.3.csv.gz Download
Soil lab measurements — Parquet ossl_soillab_v1.3.parquet Download
Soil site metadata — CSV (gzip) ossl_soilsite_v1.3.csv.gz Download
Soil site metadata — Parquet ossl_soilsite_v1.3.parquet Download

Map

Soil site information

  • Coordinates precision: precise, county, country
  • Sampling depth: various
  • Geography: soil taxonomy, soil horizon
  • Variables available (OSSL): 15 out of 15 — see Database description for full schema
  • Populated columns: id.layer_local_c, id.kssl.lay_local_txt, id.presentation_src_txt, id.kssl.smp_local_txt, loc.country_src_txt, loc.fips.code, longitude.point_wgs84_dd, latitude.point_wgs84_dd, longitude.county_wgs84_dd, latitude.county_wgs84_dd, pedon.taxa_usda_txt, pedon.horizon_usda_txt, layer.texture_usda_txt, layer.upper.depth_usda_cm, layer.lower.depth_usda_cm

Soil laboratory information

  • Total samples: 2,106
  • Properties available (original): 23
  • Properties standardized (OSSL): 23 — summarized in Table 1 below
  • Categories: physical, chemical, hydrological, carbon & nutrients, metal elements
  • Original source: see Database access

Hover over any OSSL code in the table below to see its full description.

Table 1: Summary statistics (mean, SD, percentiles) for OSSL-standardized soil properties.
skim_variable n_missing mean sd p0 p25 p50 p75 p100
scan_nir.1500_ref 0 0.48 0.12 0.11 0.40 0.48 0.56 0.93
oc_usda.c729_w.pctOrganic Carbon, Total C without CaCO3, S prepMethod: usda.c729Unit: w.pct 0 2.00 2.71 -0.03 0.59 1.31 2.63 53.88
c.tot_usda.a622_w.pctCarbon, Total NCSMethod: usda.a622Unit: w.pct 90 2.29 2.80 0.02 0.82 1.59 2.97 53.88
n.tot_usda.a623_w.pctNitrogen, Total NCS, usda.a623Method: usda.a623Unit: w.pct 0 0.17 0.18 0.00 0.06 0.12 0.22 3.02
s.tot_usda.a624_w.pctSulfur, Total NCSMethod: usda.a624Unit: w.pct 90 0.13 1.02 0.00 0.00 0.01 0.03 18.38
ph.h2o_usda.a268_indexpH, 1:1 Soil-Water SuspensionMethod: usda.a268Unit: index 10 6.25 1.26 3.69 5.21 6.12 7.35 9.52
bd_usda.a4_g.cm3Bulk Density, <2mm fraction, ClodMethod: usda.a4Unit: g.cm3 1142 1.31 0.24 0.30 1.18 1.34 1.47 2.03
clay.tot_usda.a334_w.pctClayMethod: usda.a334Unit: w.pct 0 20.55 14.54 0.00 9.08 18.33 28.82 86.69
silt.tot_usda.c62_w.pctSilt, Total, S prepMethod: usda.c62Unit: w.pct 0 37.57 20.30 0.00 21.80 37.40 52.10 87.90
sand.tot_usda.c60_w.pctSand, Total, S prepMethod: usda.c60Unit: w.pct 0 41.88 27.95 0.30 17.60 39.25 64.38 100.00
caco3_usda.a54_w.pctCarbonate, <2mm FractionMethod: usda.a54Unit: w.pct 1413 5.91 9.49 -0.57 0.26 1.64 7.61 89.03
cec_usda.a723_cmolc.kgCEC, pH 7.0, NH4OAc, 2M KCl displacementMethod: usda.a723Unit: cmolc.kg 10 16.05 12.11 0.13 7.74 14.08 21.96 190.11
ca.ext_usda.a722_cmolc.kgCalcium, Extractable, NH4OAcMethod: usda.a722Unit: cmolc.kg 10 19.23 31.73 0.00 2.52 9.78 22.19 363.64
mg.ext_usda.a724_cmolc.kgMagnesium, Extractable, NH4OAc, 2M KCl displacementMethod: usda.a724Unit: cmolc.kg 10 3.24 4.52 0.00 0.68 1.98 4.29 82.14
k.ext_usda.a725_cmolc.kgPotassium, Extractable, NH4OAc, 2M KCl displacementMethod: usda.a725Unit: cmolc.kg 10 0.55 0.73 0.00 0.14 0.33 0.68 11.25
na.ext_usda.a726_cmolc.kgSodium, Extractable, NH4OAc, 2M KCl displacementMethod: usda.a726Unit: cmolc.kg 10 0.88 8.10 0.00 0.00 0.00 0.05 202.96
wr.33kPa_usda.a415_w.pctWater Retention, 1/3 Bar (33 kPa)Method: usda.a415Unit: w.pct 1875 23.87 13.74 1.00 14.17 24.22 31.44 127.90
wr.1500kPa_usda.a417_w.pctWater Retention, 15 Bar (1500 kPa)Method: usda.a417Unit: w.pct 35 11.59 7.27 0.08 6.49 10.81 15.21 96.14
al.dith_usda.a65_w.pctAluminum, Crystalline, Total Pedogenic IronMethod: usda.a65Unit: w.pct 231 0.18 0.25 0.00 0.04 0.10 0.19 2.28
p.ext_usda.a652_mg.kgPhosphorus, Extractable, Mehlich3Method: usda.a652Unit: mg.kg 1378 35.21 81.75 0.00 2.96 11.25 34.89 1358.90
p.ext_usda.a1070_mg.kgPhosphorus, Extractable, Mehlich3Method: usda.a1070Unit: mg.kg 2030 27.26 35.04 0.36 6.52 15.96 39.22 256.44
k.ext_usda.a1065_mg.kgPotassium, Extractable, Mehlich3Method: usda.a1065Unit: mg.kg 2030 185.49 136.84 0.00 82.01 147.45 256.33 730.19
ec_usda.a364_ds.mElectrical Conductivity, (w/w)Method: usda.a364Unit: ds.m 1154 1.00 4.72 0.01 0.13 0.23 0.46 81.93

NIR

  • Acquisition mode: Not available
  • Intensity: reflectance
  • Original range: 1350-2550
  • Instrument: Neospectra
  • Manufacturer: SiWare
  • Instrument co-scans: Not available
  • Scan repeats: 6
  • Scan accessory: Not available
  • Original resolution: 8-16 cm-1
  • Sample preparation: Oven-dried, Sieved < 2mm
  • Additional info: Not available

NIR plot

References

  1. Publication 1
  2. Publication 2