mrvbf_threshold

Calculates the t_slope value for the Multiresolution Index of Valley Bottom
Flatness (Gallant and Dowling, 2003) based on input DEM resolution. MRVBF
identified valley bottoms based on classifying slope angle and identifying
low areas by ranking elevation in respect to the surrounding topography
across a range of DEM resolutions. The MRVBF algorithm was developed using a
25 m DEM, and so if the input DEM has a different resolution then the slope
threshold t_slope needs to be adjusted from its default value of 16 in order
to maintain the relationship between slope and DEM resolution. This function
provides a convenient way to perform that calculation.

Provides an R scripting interface to the open-source 'SAGA-GIS'
(System for Automated Geoscientific Analyses Geographical Information
System) software. 'Rsagacmd' dynamically generates R functions for every
'SAGA-GIS' geoprocessing tool based on the user's currently installed
'SAGA-GIS' version. These functions are contained within an S3 object
and are accessed as a named list of libraries and tools. This structure
facilitates an easier scripting experience by organizing the large number
of 'SAGA-GIS' geoprocessing tools (>700) by their respective library.
Interactive scripting can fully take advantage of code autocompletion tools
(e.g. in 'Rstudio'), allowing for each tools syntax to be quickly
recognized. Furthermore, the most common types of spatial data (via the
'terra', 'sp', and 'sf' packages) along with non-spatial data are
automatically passed from R to the 'SAGA-GIS' command line tool for
geoprocessing operations, and the results are loaded as the appropriate R
object. Outputs from individual 'SAGA-GIS' tools can also be chained using
pipes from the 'magrittr' and 'dplyr' packages to combine complex
geoprocessing operations together in a single statement. 'SAGA-GIS' is
available under a GPLv2 / LGPLv2 licence from
<https://sourceforge.net/projects/saga-gis/> including Windows x86/x64
and macOS binaries. SAGA-GIS is also included in Debian/Ubuntu default software
repositories. Rsagacmd has currently been tested on 'SAGA-GIS' versions
from 2.3.1 to 9.0.1 on Windows, Linux and macOS.

Steven Pawley

Rsagacmd

Linking R with the Open-Source 'SAGA-GIS' Software

mrvbf_threshold function

<dl><dt>res</dt>
<dd>numeric, DEM resolution</dd></dl>

Arguments

Calculate the t_slope value based on DEM resolution for MRVBF — mrvbf_threshold

<dl>

<dt>res</dt>
<dd>numeric, DEM resolution</dd>

</dl>

mrvbf_threshold: Calculate the t_slope value based on DEM resolution for MRVBF

Description

Usage

Value

Arguments

Examples