Description
Calculate a supplied percent-cover class midpoint and width.
Ecological records need explicit sampling units, detection states, effort denominators, interval geometry and trait/abundance bases. Nondetection differs from absence, and shared sampling-unit labels do not alone diagnose pseudoreplication. A one-axis overlap or single weighted contribution is only a limited component of a broader ecological analysis.
Calculate a supplied percent-cover class midpoint and width.
When to use this tool
Use Quadrat Cover Class Midpoint when you already have classLowerPercent, classUpperPercent and need to calculate a supplied percent-cover class midpoint and width.
How to use the tool and how it works
- Enter classLowerPercent, classUpperPercent. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read midpointPercent, intervalWidth. Use the output convention below.
Require 0<=lower<=upper<=100; midpoint=lower/2+upper/2, intervalWidth=upper-lower.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| classLowerPercent | Class Lower Percent | Required. Finite number; minimum 0. |
| classUpperPercent | Class Upper Percent | Required. Finite number; maximum 100. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| midpointPercent | Midpoint Percent | Required. Finite number. |
| intervalWidth | Upper-lower in percentage points; midpointPercent remains a 0..100 percentage number. | Required. Finite number. |
{
"input": {
"classLowerPercent": 25,
"classUpperPercent": 50
},
"output": {
"midpointPercent": 37.5,
"intervalWidth": 25
}
}Limitations and assumptions
- Outputs are percentage numbers and percentage-point width. The midpoint is a convention, not measured cover, an unbiased estimate or inferred within-class distribution.
- 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
Review original survey records, sampling design, specimens and calibration definitions for an ecological conclusion. Use complete detection, population, community or process models as appropriate; local count rates and source labels do not infer unobserved states or ecological mechanisms.
References
Similar or alternative tools
- Species Niche Axis Overlap
Calculate interval overlap width and the outer span of two supplied niche-axis ranges.
- Feature Quantization Single Bin Midpoint
Calculate the midpoint of supplied ordered quantization-bin edges.