12 votes
Accepted

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

If you are open to using alternative software to solve your problem, then I can suggest the Remove Off-Terrain Objects tool of the cross-platform open-source GIS Whitebox Geospatial Analysis Tools (of ...
  • 10.9k
8 votes
Accepted

Strange output from RSAGA topographic wetness index?

I think I see the problem. I could reproduce this, both using your script, and SAGA itself. The output from SAGA matches the output from your script. So it's not RSAGA. But look at the slope output ...
  • 19.8k
6 votes

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

I would have to say that without the original LAS point cloud, you will only be incorporating more inaccuracies into the data through raster manipulation. The DEM provided looks relatively clean for ...
  • 5,727
5 votes
Accepted

Reproducing terrain ruggedness index from the original paper example

I hate the be the bearer of bad news but, Riley et al., (1999) is wrong. The ruggedness index itself is fine but, the example in the paper is incorrect. Obviously, the reviewers did not work through ...
5 votes
Accepted

Choosing Topographic Wetness Index or Flow Accumulation raster?

This brings up an interesting theoretical question regarding slope process in relation to scale. The TWI/CTI is a slope/flow accumulation interaction. However, once must question the exact process ...
4 votes
Accepted

Choosing parameters for SAGA Wetness Index?

After lots of calculations and experiments I think I can (at least partly) answer my own question: Suction: according to the source code (Conrad 2014), a suction of 10 is "average", a smaller value, ...
  • 143
2 votes
Accepted

Getting error 000539 when calculating TWI?

This error states that you exported a Model Builder model to Python and your model included a raster calculator function. The raster calculator is only available as a geoprocessing tool. You will ...
  • 7,492

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