Description
Return area density after a supplied processed fraction.
Aquatic sampling expands observed counts using supplied area, filtered volume or processed fractions. Net efficiency, slip and grain-class boundaries affect that accounting. A scaled count or one-point class assignment does not establish true population abundance, detection probability or a universal substrate classification.
Return area density after a supplied processed fraction.
When to use this tool
Use Benthic Sample Sieved Fraction Area when checking the stated aquatic sampling-volume, density or class-boundary convention.
How to use the tool and how it works
- Enter sampleArea, processedFraction, organisms. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read effectiveArea, density. Use the output convention below.
Return area density after a supplied processed fraction. Require sampleArea > 0, processedFraction in (0,1] and nonnegative whole organisms; effectiveArea = area*fraction, density = count/effectiveArea.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| sampleArea | Sample Area | Required. Finite number; strictly above 0. |
| processedFraction | Processed Fraction | Required. Finite number; maximum 1; strictly above 0. |
| organisms | Organisms | Required. Safe integer; minimum 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| effectiveArea | Effective Area | Required. Finite number. |
| density | Mass or count divided by the explicitly stated volume/area basis; use compatible units. | Required. Finite number. |
{
"input": {
"sampleArea": 0.2,
"processedFraction": 0.5,
"organisms": 30
},
"output": {
"effectiveArea": 0.1,
"density": 300
}
}Limitations and assumptions
- This assumes representative processing of the selected fraction; no actual sieve capture, organism identity or detection correction is inferred.
- 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 field methods, calibrated sampling efficiency and an appropriate statistical or classification scheme for abundance and ecological assessment.
References
Similar or alternative tools
- Benthic Count Unknown Area Flag
Return benthic density only when area is known and positive.
- Plankton Count Volume Factor
Scale an observed plankton count to a reference volume.