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r.accumulate: Update the manual with a new difference map name and LFP citations #959

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Oct 18, 2023
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r.accumulate: Update the manual with a new difference map name and LFP citations #959

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r.accumulate: Rename accum_diff to flow_accum_diff in the manual
HuidaeCho Oct 17, 2023
26c3a29
Add citations for LFP
HuidaeCho Oct 18, 2023
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28 changes: 14 additions & 14 deletions src/raster/r.accumulate/r.accumulate.html
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Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
<h2>DESCRIPTION</h2>

<em>r.accumulate</em> calculates weighted flow accumulation, subwatersheds,
stream networks, and longest flow paths using a flow direction map.
stream networks, and longest flow paths (Cho 2020) using a flow direction map.

<h2>NOTES</h2>

Expand Down Expand Up @@ -62,12 +62,12 @@ <h3>Longest flow path calculation</h3>

With <b>longest_flow_path</b> option, the module will create a longest flow
path vector map for outlet points specified by <b>coordinates</b> and/or
<b>outlet</b> with <b>outlet_layer</b> option. By default, longest flow paths
will be created as if there were subwatersheds at the outlets by calculating
the subaccumulation map. Downstream longest flow paths will never traverse
through upstream outlets. With <b>-a</b> flag, longest flow paths will be
created in an accumulated manner resulting in an overlap between downstream and
upstream longest flow paths.
<b>outlet</b> with <b>outlet_layer</b> option, using the algorithm by Cho
(2020). By default, longest flow paths will be created as if there were
subwatersheds at the outlets by calculating the subaccumulation map. Downstream
longest flow paths will never traverse through upstream outlets. With <b>-a</b>
flag, longest flow paths will be created in an accumulated manner resulting in
an overlap between downstream and upstream longest flow paths.

<p>You can assign unique IDs to longest flow paths using <b>id</b> (with
<b>coordinates</b>) and/or <b>outlet_id_column</b> (with <b>outlet</b>).
Expand Down Expand Up @@ -100,17 +100,17 @@ <h3>Flow accumulation</h3>
r.colors map=flow_accum_new raster=flow_accum

# check difference between flow_accum and flow_accum_new
r.mapcalc expression="accum_diff=if(flow_accum-flow_accum_new, flow_accum-flow_accum_new, null())"
r.mapcalc expression="flow_accum_diff=if(flow_accum-flow_accum_new, flow_accum-flow_accum_new, null())"
</pre></div>

<img src="r_accumulate_nc_example.png">

<p>For some reason, there are slight differences between the two output maps.
The yellow and purple cells show the difference raster map (<i>accum_diff</i>).
The red arrows and numbers represent drainage directions
(<i>drain_directions</i>) and flow accumulation by <em>r.watershed</em>
(<i>flow_accum</i>), respectively. Note that some cells close to headwater
cells are assigned 1 even though they are located downstream of other cells.
<p>There are slight differences between the two output maps. The yellow and
purple cells show the difference raster map (<i>flow_accum_diff</i>). The red
arrows and numbers represent drainage directions (<i>drain_directions</i>) and
flow accumulation by <em>r.watershed</em> (<i>flow_accum</i>), respectively.
Note that some cells close to headwater cells are assigned 1 even though they
are located downstream of other cells.

<p><img src="r_accumulate_r_watershed_nc_example.png">

Expand Down
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