Docs for ‘QGIS testing’. Visit http://docs.qgis.org/2.18 for QGIS 2.18 docs and translations.

Terrain channels

Channel network and drainage basins

Description

<put algorithm description here>

Parameters

Elevation [raster]
<put parameter description here>
Threshold [number]

<put parameter description here>

Default: 5.0

Outputs

Flow Direction [raster]
<put output description here>
Flow Connectivity [raster]
<put output description here>
Strahler Order [raster]
<put output description here>
Drainage Basins [raster]
<put output description here>
Channels [vector]
<put output description here>
Drainage Basins [vector]
<put output description here>
Junctions [vector]
<put output description here>

Console usage

processing.runalg('saga:channelnetworkanddrainagebasins', dem, threshold, direction, connection, order, basin, segments, basins, nodes)

See also

Channel network

Description

<put algorithm description here>

Parameters

Elevation [raster]
<put parameter description here>
Flow Direction [raster]

Optional.

<put parameter description here>

Initiation Grid [raster]
<put parameter description here>
Initiation Type [selection]

<put parameter description here>

Options:

  • 0 — [0] Less than
  • 1 — [1] Equals
  • 2 — [2] Greater than

Default: 0

Initiation Threshold [number]

<put parameter description here>

Default: 0.0

Divergence [raster]

Optional.

<put parameter description here>

Tracing: Max. Divergence [number]

<put parameter description here>

Default: 10

Tracing: Weight [raster]

Optional.

<put parameter description here>

Min. Segment Length [number]

<put parameter description here>

Default: 10

Outputs

Channel Network [raster]
<put output description here>
Channel Direction [raster]
<put output description here>
Channel Network [vector]
<put output description here>

Console usage

processing.runalg('saga:channelnetwork', elevation, sinkroute, init_grid, init_method, init_value, div_grid, div_cells, trace_weight, minlen, chnlntwrk, chnlroute, shapes)

See also

Overland flow distance to channel network

Description

<put algorithm description here>

Parameters

Elevation [raster]
<put parameter description here>
Channel Network [raster]
<put parameter description here>
Flow Algorithm [selection]

<put parameter description here>

Options:

  • 0 — [0] D8
  • 1 — [1] MFD

Default: 0

Outputs

Overland Flow Distance [raster]
<put output description here>
Vertical Overland Flow Distance [raster]
<put output description here>
Horizontal Overland Flow Distance [raster]
<put output description here>

Console usage

processing.runalg('saga:overlandflowdistancetochannelnetwork', elevation, channels, method, distance, distvert, disthorz)

See also

Strahler order

Description

<put algorithm description here>

Parameters

Elevation [raster]
<put parameter description here>

Outputs

Strahler Order [raster]
<put output description here>

Console usage

processing.runalg('saga:strahlerorder', dem, strahler)

See also

Vertical distance to channel network

Description

<put algorithm description here>

Parameters

Elevation [raster]
<put parameter description here>
Channel Network [raster]
<put parameter description here>
Tension Threshold [Percentage of Cell Size] [number]

<put parameter description here>

Default: 1

Keep Base Level below Surface [boolean]

<put parameter description here>

Default: True

Outputs

Vertical Distance to Channel Network [raster]
<put output description here>
Channel Network Base Level [raster]
<put output description here>

Console usage

processing.runalg('saga:verticaldistancetochannelnetwork', elevation, channels, threshold, nounderground, distance, baselevel)

See also

Watershed basins

Description

<put algorithm description here>

Parameters

Elevation [raster]
<put parameter description here>
Channel Network [raster]
<put parameter description here>
Sink Route [raster]

Optional.

<put parameter description here>

Min. Size [number]

<put parameter description here>

Default: 0

Outputs

Watershed Basins [raster]
<put output description here>

Console usage

processing.runalg('saga:watershedbasins', elevation, channels, sinkroute, minsize, basins)

See also