Agriculture Soil Texture Triangle Lookup Calculator

Screen caller independently verified sand/silt/clay linear-band texture regions, shared inclusive boundaries retain every match, not a fabricated USDA triangle table. Caller independently establishes units, regime, calibration and applicability; this does not establish design-code compliance, authenticity, operational safety, treatment efficacy or a validated forecast.

Description

Soil texture is a closed sand–silt–clay composition under a measurement convention.

Soil texture is a closed sand–silt–clay composition under a measurement convention.^[1]

Rectangular component bands differ from a full standardized texture-triangle polygon system. Use Agriculture Soil Texture Triangle Lookup Calculator to evaluate the supplied inputs under the model explained below.

When to use Agriculture Soil Texture Triangle Lookup Calculator

Use Agriculture Soil Texture Triangle Lookup Calculator to evaluate the supplied inputs under the model explained below. Establish the units, measurement scope and model assumptions before entering values.

How to use Agriculture Soil Texture Triangle Lookup Calculator and understand its results

Establish the units, measurement scope and model assumptions before entering values.
Enter Observed sand silt clay percent, Caller texture class ids, Caller sand silt clay lower percent, Caller sand silt clay upper percent using the field table and validation rules below, then run the tool.
Read Matching caller texture class ids; interpret the units, signs, ordering and unknown-value placeholders described below.
Correct reported input errors and rerun. Apply successful results according to their specific meanings and check the assumptions before using them in a decision.

Input field	Meaning	Value type	Requirement
observedSandSiltClayPercent	Observed sand silt clay percent	array of number	Required; constraints below
callerTextureClassIds	Caller texture class ids	array of string	Required; constraints below
callerSandSiltClayLowerPercent	Caller sand silt clay lower percent	array of array	Required; constraints below
callerSandSiltClayUpperPercent	Caller sand silt clay upper percent	array of array	Required; constraints below

Enter exactly three sand/silt/clay percentages in [0,100] whose sum differs from 100 by at most 1e−8, unique nonblank class IDs and aligned nonempty lower/upper matrices of three components each. Require 0≤lower≤upper≤100 for every component. Return all class IDs whose inclusive rectangular bands contain the composition, in caller order; overlaps are allowed. No USDA or other polygon table, normalization or lab method is installed.

matches=all three callerLower[i,j]≤observedPercent[j]≤callerUpper[i,j]

Use the field order, units and branch conditions described above.

Output field	Meaning	Value type
matchingCallerTextureClassIds	Matching caller texture class ids	array of string

json

{
  "input": {
    "observedSandSiltClayPercent": [
      40,
      40,
      20
    ],
    "callerTextureClassIds": [
      "loam",
      "overlap"
    ],
    "callerSandSiltClayLowerPercent": [
      [
        30,
        30,
        10
      ],
      [
        40,
        40,
        20
      ]
    ],
    "callerSandSiltClayUpperPercent": [
      [
        50,
        50,
        30
      ],
      [
        40,
        40,
        20
      ]
    ]
  },
  "output": {
    "matchingCallerTextureClassIds": [
      "loam",
      "overlap"
    ]
  }
}

Limitations and assumptions

Rectangular component bands differ from a full standardized texture-triangle polygon system. Apply the exact scope and assumptions explained above.

All listed fields require explicit values. Unexpected fields, incorrect types, nonfinite numbers and sparse arrays fail validation. Domain-specific bounds, alignments and supported tokens are explained above; extremely large inputs or outputs can also be rejected. Input errors differ from successful false results, empty match lists and unknown-evidence placeholders.

Alternative or Complementary methods

Use Agriculture Soil Texture Silt Percentage Calculator for a related task: Silt can be estimated by subtracting included clay from a measured fine fraction.

Use Agriculture Soil Texture Sand Percentage Calculator for a related task: Sand percentage can be based on recovered material while uncaptured mass is tracked separately.

References

Agriculture Soil Texture Triangle Lookup Calculator — tool.io

Similar or alternative tools

Agriculture Soil Texture Silt Percentage Calculator
Silt can be estimated by subtracting included clay from a measured fine fraction.
Agriculture Soil Texture Sand Percentage Calculator
Sand percentage can be based on recovered material while uncaptured mass is tracked separately.