Questions tagged [topographic-wetness-index]

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Unexpected error while RSAGA raster calculations

I want to use RSAGA package in R to calculate the topographical wetness index. However, while applying the rsaga.wetness.index() function, R gives me an error message (see below). My question is, ...
2
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342 views

Using SAGA-GIS topographic wetness index in R?

I want to create a topographic wetness index (TWI) in R and I am trying to set an environment according to the help of RSAGA-package but I am always facing with an error appears in a different term. ...
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27 views

QGIS Flow accumulation tool frozen at 100%

My goal is to apply a topographic wetness index to a DEM using QGIS Version 3.20.2-Odense, running on a macOS laptop. I have clipped my DEM layer for the appropriate study area, and calculated slope ...
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45 views

NoData values in soil wetness index

I would like to know why I am getting no data pixels in my soil wetness raster, since none of the source rasters used to calculate the SWI have no data values. method I used: soil data from HWSD FAO ...
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34 views

Raster error calculating TWI with dynatopmodel

I am trying to calculate elevation, upslope and TWI from an ASTER DEM in R using dynatopmodel. The build_layers function requires that the raster has a resolution of at least 30m and is in a projected ...
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99 views

Topographic Wetness Index difference between SAGA and TauDEM

I calculated Topographic Wetness Index (TWI) using SAGA and TauDEM. Overall trend is similar but SAGA returned larger values compared with TauDEM. Sometimes the deviations are as large as 7 or 8. I am ...