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, ...
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0answers
23 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 ...
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26 views

Topographic Wettness Index for ecology; SAGA; usage of “sink route” for flow accumulation

The Goal is to Create a Topographic Wetness Index for ecological Studies. Saga-GIS 7.3.0 General Approach for TWI(Kopecky) calculate slope from original DEM (no filled sinks) prepare DEM with ...
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0answers
23 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 ...
0
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2answers
33 views

Getting error 000539 when calculating TWI?

I'm trying to calculate the twi from my area using LN((flowaccu+1)*900/Tan(sloperadian). My first result was wrong because my area is an endhoreic basin. So I made a flow accumulation raster based on ...
5
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1answer
174 views

Choosing Topographic Wetness Index or Flow Accumulation raster?

What is the better raster to use qualitatively - Topographic Wetness Index or Flow Accumulation - to clearly see potential areas of surface flow/wetness across a landscape? As an example, what's "...
3
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1answer
403 views

Choosing parameters for SAGA Wetness Index?

I've been working with SAGA GIS to calculate the Topographic Wetness Index of an alpine catchment. I am using the tool Terrain analysis > Hydrology > SAGA Wetness Index because, compared to ...
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0answers
211 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. ...
6
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1answer
776 views

Strange output from RSAGA topographic wetness index? [duplicate]

I am trying to generate a topographic wetness index raster with the RSAGA package in R. The output I am able to generate does not make sense to me, as it has a large number of NA cells and I wonder if ...
1
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0answers
105 views

Hydrology Analysis via SAGA - what is the unit? [closed]

I did a couple of analysis via SAGA about an area in Iceland...I've never worked with SAGA before, could anyone tell me what Units the numbers in the legends for "Catchment Area Recursive" and "...
10
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2answers
448 views

Cleaning blocks pattern from urban LIDAR (blocks uplifted from streets)

We have a 1-meter LIDAR DEM from a city. A small subset can be downloaded from this link: This screenshot shows raw DEM with gray palette (darker belts are streets, and greyish and whitish ...
9
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1answer
16k views

Calculating Topographic Wetness Index (choosing from different algorithms)

Topographic Wetness Index can be expressed as Ln(a/tanB) based on the idea of Beven and Kirkby (1979) where a is the specific catchment area (a=A/L, catchment area (A)divided by contour length(...
7
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1answer
7k views

Calculate Topographic wetness index in SAGA

i am currently working on a project which involves the quantification of the wetness in certain areas. However it produces quite different results from what i expected. I'll describe the steps i have ...