Watershed Road Density km/km²
Aggregate nonoverlapping local road-length/area inventories and caller density exceedances, not simple averaging of unequal catchments; road locations and drainage connectivity are not inferred.
Description
Road density is length per land area.
Road density is length per land area. Pooling road length and area across unequal subcatchments differs from averaging local densities.1
Aggregate nonoverlapping local road-length/area inventories and caller density exceedances, not simple averaging of unequal catchments; road locations and drainage connectivity are not inferred.
When to use Watershed Road Density km/km²
Use this tool to aggregate nonoverlapping local road-length/area inventories and caller density exceedances, not simple averaging of unequal catchments; road locations and drainage connectivity are not inferred.
Gather the tree inventory, plot measurements or model parameters. Check diameter, area, time and moisture conventions; keep paired observations aligned.
How to use Watershed Road Density km/km² and understand its results
- Gather the tree inventory, plot measurements or model parameters. Check diameter, area, time and moisture conventions; keep paired observations aligned.
- Enter subcatchmentRoadLengthsKm, subcatchmentAreasKm2, callerRoadDensityLimitKmPerKm2 using the field table and calculation rules, then run the tool.
- Read localRoadDensitiesKmPerKm2, pooledRoadDensityKmPerKm2, aboveCallerDensityFlags. The explanation below defines the units, signs, ordering and any flags or placeholder values.
- If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.
| Input field | Meaning | Value type; see rules below | Requirement |
|---|---|---|---|
| subcatchmentRoadLengthsKm | Subcatchment road lengths km | list of number | Required |
| subcatchmentAreasKm2 | Subcatchment areas km2 | list of number | Required |
| callerRoadDensityLimitKmPerKm2 | Caller road density limit km per km2 | number | Required |
Pair nonnegative road km with positive nonoverlapping area km² and a nonnegative density limit. Return local and pooled densities and strict above-limit flags.
Paired lists must be nonempty and have equal lengths.
local density=road km/area km²; pooled density=total km/total km² Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| localRoadDensitiesKmPerKm2 | Local road densities km per km2 | list of number |
| pooledRoadDensityKmPerKm2 | Pooled road density km per km2 | number |
| aboveCallerDensityFlags | Above caller density flags | list of number |
{
"input": {
"subcatchmentRoadLengthsKm": [
2,
9
],
"subcatchmentAreasKm2": [
1,
3
],
"callerRoadDensityLimitKmPerKm2": 2.5
},
"output": {
"localRoadDensitiesKmPerKm2": [
2,
3
],
"pooledRoadDensityKmPerKm2": 2.75,
"aboveCallerDensityFlags": [
0,
1
]
}
}Limitations and assumptions
Road position, drainage connectivity and environmental impact are not inferred.
Numeric inputs and returned numeric values must be finite; an unrepresentable returned value produces an error. Numeric lists are limited to 100,000 entries; the rules above may require smaller limits. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.
Alternative or Complementary methods
Use Stream Crossing Density Per Road-km: Summarize observed crossing density on assessed road exposure with unassessed coverage retained; no invented crossings, mapped intersections or drainage-impact rating. For a complementary task, use Watershed Clearcut Percent Threshold Checker: Audit independently supplied nonoverlapping subcatchment clearcut inventories against caller thresholds and aggregate area, preserving local exceedances; no watershed routing or regulatory/hydrological safety certification.
References
-
Watershed Road Density km/km² — tool.io
Similar or alternative tools
- Stream Crossing Density Per Road-km
Summarize observed crossing density on assessed road exposure with unassessed coverage retained; no invented crossings, mapped intersections or drainage-impact rating.
- Watershed Clearcut Percent Threshold Checker
Audit independently supplied nonoverlapping subcatchment clearcut inventories against caller thresholds and aggregate area, preserving local exceedances; no watershed routing or regulatory/hydrological safety certification.