MTQ

MTQ

Near-infrared soil spectral library from rural areas of the Martinique island (MTQ)

VNIR NIR MIR
National — Martinique island
<1,000 samples version 3.1 CC-BY

Database access

Data originally provided by:

Available files

Type Filename Link
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
  • Sampling depth: various
  • Geography: soil taxonomy, landuse
  • Variables available (OSSL): 13 out of 13 — see Database description for full schema
  • Populated columns: id.layer_uuid_txt, id.layer_local_c, site.id_src_txt, loc.region_src_txt, loc.municipality_src_txt, latitude.point_wgs84_dd, longitude.point_wgs84_dd, pedon.taxa_src_txt, site.land.use_src_txt, site.land.history_src_txt, layer.upper.depth_usda_cm, layer.lower.depth_usda_cm, layer.sequence_usda_uint16

Soil laboratory information

  • Total samples: 516
  • Properties available (original): 13
  • Properties standardized (OSSL): 12 — summarized in Table 1 below
  • Categories: physical, carbon & nutrients
  • 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
oc_iso.10694_w.pctOrganic Carbon, ISO 10694Method: iso.10694Unit: w.pct 0 1.60 1.19 0.09 0.74 1.33 2.08 8.85
n.tot_iso.13878_w.pctNitrogen, Total NCS, ISO 13878Method: iso.13878Unit: w.pct 0 0.15 0.10 0.01 0.07 0.13 0.18 0.62
clay.tot_iso.11277_w.pctClay, ISO 11277Method: iso.11277Unit: w.pct 222 43.10 21.94 3.30 21.00 50.40 61.30 82.40
bd_iso.11277_g.cm3 0 0.92 0.18 0.35 0.79 0.92 1.04 1.49
cf_iso.11464_w.pctCoarse Fragments, ISO 11464Method: iso.11464Unit: w.pct 344 38.81 15.16 2.10 29.10 39.15 46.87 88.90
sand.tot_iso.11277_w.pctSand, Total, ISO 11277Method: iso.11277Unit: w.pct 222 36.47 21.93 2.30 18.22 29.35 58.05 87.90
silt.tot_iso.11277_w.pctSilt, Total, ISO 11277Method: iso.11277Unit: w.pct 222 20.46 6.14 6.40 16.70 21.05 25.10 34.30

NIR

  • Acquisition mode: Not available
  • Intensity: reflectance
  • Original range: 1100-2498
  • Instrument: Foss NIRSystems 5000 spectrophotometer
  • Manufacturer: Laurel, MD, USA; 2003
  • Instrument co-scans: 32
  • Scan repeats: 2
  • Scan accessory: Not available
  • Original resolution: 2 nm
  • Sample preparation: Oven-dried, Sieved < 2mm
  • Additional info: Not available

NIR plot

References

  1. Publication 1