Holdridge Life Zone Classifier

Holdridge biotemperature monthly 0 outside 0<T<30°C, PET=58.93 Tb; query caller independently verified life zone polygons in log 2 Tb/log 2 Pspace, not fake universal zone table. Caller independently establishes homogeneous observation coverage and model/reference applicability; not observed future climate, crop suitability or validated drought severity.

Description

Holdridge-style comparisons locate biotemperature and rainfall in a logarithmic reference plane.

Holdridge-style comparisons locate biotemperature and rainfall in a logarithmic reference plane.^[1]

The supplied zone polygons define the classification rather than an installed universal zone map. Use Holdridge Life Zone Classifier to evaluate the supplied inputs under the model explained below.

When to use Holdridge Life Zone Classifier

Use Holdridge Life Zone Classifier to evaluate the supplied inputs under the model explained below. Establish the units, measurement scope and model assumptions before entering values.

How to use Holdridge Life Zone Classifier and understand its results

Establish the units, measurement scope and model assumptions before entering values.
Enter Monthly temperature c, Annual precipitation mm, Caller verified zone ids, Caller log2 bio temperature log2 precipitation polygons using the field table and validation rules below, then run the tool.
Read Clipped monthly biotemperature c, Holdridge potential evaporation ratio, Compatible caller zone 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
monthlyTemperatureC	Monthly temperature c	array of number	Required; constraints below
annualPrecipitationMm	Annual precipitation mm	number	Required; constraints below
callerVerifiedZoneIds	Caller verified zone ids	array of string	Required; constraints below
callerLog2BioTemperatureLog2PrecipitationPolygons	Caller log2 bio temperature log2 precipitation polygons	array of array	Required; constraints below

Enter exactly twelve finite monthly temperatures in °C, positive annual precipitation in mm, nonempty unique caller zone IDs and vertices [zeroBasedZoneIndex,log2Biotemperature,log2Precipitation]. At most 64 zones and 128 vertices are accepted; each zone needs at least three distinct ordered vertices, nonzero area and no self-intersection. A repeated closing endpoint is allowed. Average temperatures only when strictly between 0 and 30°C; all others contribute zero, and the average must be positive. Return that biotemperature, 58.93×bio/rain, and every polygon containing the log2 point, including exact boundaries, in caller order. No default polygons, coordinate tolerance or categorical zone table is supplied.

bio=mean(T if 0<T<30 else 0); PETRatio=58.93×bio/annualRain; query=(log2(bio),log2(annualRain))

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

Output field	Meaning	Value type
clippedMonthlyBiotemperatureC	Clipped monthly biotemperature c	number
holdridgePotentialEvaporationRatio	Holdridge potential evaporation ratio	number
compatibleCallerZoneIds	Compatible caller zone ids	array of string

json

{
  "input": {
    "monthlyTemperatureC": [
      20,
      20,
      20,
      20,
      20,
      20,
      20,
      20,
      20,
      20,
      20,
      20
    ],
    "annualPrecipitationMm": 1000,
    "callerVerifiedZoneIds": [
      "zone-a"
    ],
    "callerLog2BioTemperatureLog2PrecipitationPolygons": [
      [
        0,
        4,
        9
      ],
      [
        0,
        5,
        9
      ],
      [
        0,
        5,
        11
      ],
      [
        0,
        4,
        11
      ]
    ]
  },
  "output": {
    "clippedMonthlyBiotemperatureC": 20,
    "holdridgePotentialEvaporationRatio": 1.1785999999999999,
    "compatibleCallerZoneIds": [
      "zone-a"
    ]
  }
}

Limitations and assumptions

The supplied zone polygons define the classification rather than an installed universal zone map. 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 Trewartha Climate Classifier for a related task: Trewartha-style groups combine temperature seasonality with an aridity criterion.

Use Koppen Climate Class Classifier for a related task: A Köppen-style classifier uses monthly temperature and precipitation normals and a hemisphere convention.

References

Holdridge Life Zone Classifier — tool.io

Similar or alternative tools

Trewartha Climate Classifier
Trewartha-style groups combine temperature seasonality with an aridity criterion.
Koppen Climate Class Classifier
A Köppen-style classifier uses monthly temperature and precipitation normals and a hemisphere convention.