r.watershed
How GRASS runs Flow Direction: r.watershed.
| Engine | GRASS |
|---|---|
| Tool name | r.watershed |
| Interface | cli |
| Implements | Flow Direction |
| Variant of | grass-r-watershed |
| Preset | {"flag_s":true,"flag_a":true} |
| Documentation | Not stated |
| Effects | modifies input: no, network: no |
| Notes | Not stated |
| Status | active |
Parameters
| Name | Type | Required | Default | Choices | Note |
|---|---|---|---|---|---|
elevation | string | yes | Not stated | Not stated | cell name |
depression | string | no | Not stated | Not stated | cell name |
flow | string | no | Not stated | Not stated | cell name |
disturbed_land | string | no | Not stated | Not stated | cell name |
blocking | string | no | Not stated | Not stated | cell name |
retention | string | no | Not stated | Not stated | cell name |
threshold | integer | no | Not stated | Not stated | Not stated |
max_slope_length | float | no | Not stated | Not stated | Not stated |
accumulation | string | no | Not stated | Not stated | output cell |
tci | string | no | Not stated | Not stated | output cell |
spi | string | no | Not stated | Not stated | output cell |
drainage | string | no | Not stated | Not stated | output cell |
basin | string | no | Not stated | Not stated | output cell |
stream | string | no | Not stated | Not stated | output cell |
half_basin | string | no | Not stated | Not stated | output cell |
length_slope | string | no | Not stated | Not stated | output cell |
slope_steepness | string | no | Not stated | Not stated | output cell |
convergence | integer | no | 5 | Not stated | Not stated |
memory | integer | no | 300 | Not stated | Not stated |
flag_s | boolean | no | Not stated | Not stated | flag -s |
flag_4 | boolean | no | Not stated | Not stated | flag -4 |
flag_m | boolean | no | Not stated | Not stated | flag -m |
flag_a | boolean | no | Not stated | Not stated | flag -a |
flag_b | boolean | no | Not stated | Not stated | flag -b |
flag_overwrite | boolean | no | Not stated | Not stated | flag --overwrite |
How it maps to the operation
| Operation parameter | Parameter here | Note |
|---|---|---|
raster | elevation | Not stated |
output | drainage | Not stated |
encoding | Not stated | always grass |
Differences from the operation
- This mapping sets flags s (single flow direction) and a; negative codes mark cells that drain out of the region.
Harvested by the grass harvester from engine version
8.5.0. Names can change when an engine is harvested again.