Description
Sum weights whose label matches requestedGroup and divide by all weights; zero total returns share=0, defined=false.
Ecological observation summaries depend on sampling effort, eligible time, classified counts and missingness policies. Flower-minutes, area-days and observed proportions have different denominators. Observation support is distinct from true abundance, detection probability or a causal biological-control effect.
Sum weights whose label matches requestedGroup and divide by all weights; zero total returns share=0, defined=false.
When to use this tool
Use Crop Functional Group Share when checking the stated observation support, exposure, sample or seasonal-gap convention.
How to use the tool and how it works
- Enter cropGroups, cropWeights, requestedGroup. Follow any array-alignment requirements below. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read groupWeight, share, defined. Inspect defined before interpreting the associated values.
Require aligned crop-group labels and nonnegative weights. Sum weights whose label matches requestedGroup and divide by all weights; zero total returns share=0, defined=false.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| cropGroups | Crop Groups | Required. Array of text; maximum UTF-16 length 8192; maximum items 256. |
| cropWeights | Crop Weights | Required. Array of finite number; minimum 0; maximum items 256. |
| requestedGroup | Requested Group | Required. Text; maximum UTF-16 length 8192. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| groupWeight | Group Weight | Required. Finite number. |
| share | Dimensionless share using the operation-specific denominator stated above; not a percentage number. | Required. Finite number. |
| defined | Whether the corresponding reporting denominator/value is defined; inspect before interpreting zero placeholders. | Required. Boolean. |
{
"input": {
"cropGroups": [
"legume",
"cereal",
"legume"
],
"cropWeights": [
2,
6,
2
],
"requestedGroup": "legume"
},
"output": {
"groupWeight": 4,
"share": 0.4,
"defined": true
}
}Limitations and assumptions
- Weights may represent area or another explicit common basis; labels are literal and not a functional-trait classification.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Use verified representative field records and suitable sampling/detection analysis for ecological inference, uncertainty and management.
References
Similar or alternative tools
- Field Edge Habitat Share
Return usableEdge=edge-excluded and usableEdge/total.
- Groundcover Bare Soil Fraction Gap
Return bareFraction=1-cover and signed observed-minus-target coverGap.