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.
Description
Stream-crossing density is a count per assessed road length.
Stream-crossing density is a count per assessed road length. Reporting assessed coverage keeps unexamined roads from being silently treated as crossing-free.1
Summarize observed crossing density on assessed road exposure with unassessed coverage retained; no invented crossings, mapped intersections or drainage-impact rating.
When to use Stream Crossing Density Per Road-km
Use this tool to summarize observed crossing density on assessed road exposure with unassessed coverage retained; no invented crossings, mapped intersections or drainage-impact rating.
Gather the tree inventory, plot measurements or model parameters. Check diameter, area, time and moisture conventions; keep paired observations aligned.
How to use Stream Crossing Density Per Road-km 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 streamCrossingCounts, assessedRoadLengthsKm, unassessedRoadLengthKm using the field table and calculation rules, then run the tool.
- Read assessedCrossingDensityPerRoadKm, assessedRoadCoverageFraction, totalCrossingsOnAssessedRoads. 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 |
|---|---|---|---|
| streamCrossingCounts | Stream crossing counts | list of number | Required |
| assessedRoadLengthsKm | Assessed road lengths km | list of number | Required |
| unassessedRoadLengthKm | Unassessed road length km | number | Required |
Pair nonnegative integer crossing counts with positive assessed km and supply nonnegative unassessed km. Return pooled crossings/km, assessed road fraction and total observed crossings.
Paired lists must be nonempty and have equal lengths.
crossing density=total observed crossings/assessed km; coverage=assessed/(assessed+unassessed) Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| assessedCrossingDensityPerRoadKm | Assessed crossing density per road km | number |
| assessedRoadCoverageFraction | Assessed road coverage fraction | number |
| totalCrossingsOnAssessedRoads | Total crossings on assessed roads | number |
{
"input": {
"streamCrossingCounts": [
2,
6
],
"assessedRoadLengthsKm": [
1,
3
],
"unassessedRoadLengthKm": 1
},
"output": {
"assessedCrossingDensityPerRoadKm": 2,
"assessedRoadCoverageFraction": 0.8,
"totalCrossingsOnAssessedRoads": 8
}
}Limitations and assumptions
No crossings are inferred on unassessed roads. Locations, intersections and drainage-impact ratings are not computed.
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 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. For a complementary task, use Skid Trail Density Percent Area: Account supplied trail strip areas and independently measured overlap before computing harvested-area occupation; no coordinate footprint construction or simple summed-overlap cover assumption.
References
-
Stream Crossing Density Per Road-km — tool.io
Similar or alternative tools
- 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.
- Skid Trail Density Percent Area
Account supplied trail strip areas and independently measured overlap before computing harvested-area occupation; no coordinate footprint construction or simple summed-overlap cover assumption.