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I got stripes in my topographic corrected Landsat images (see second image below). I used SAGA GIS 2.0.8 at xubuntu 12.04

Image and DEM are in the same projection, tried it with EPSG:32636 and EPSG:4326

original Landsat image

topo corrected Landsat image

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Did you used the same pixel resolution for both dem and landsat? – maning Aug 12 '12 at 14:51
Ahhh, thats a point: landsat has a cell size of 30, the DEM of 28. How do I change the DEM cell size to 30? – MAP Aug 12 '12 at 15:35
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You need to resample the DEM to the Landsat resolution (e.g. with the bilinear method if provided by SAGA). – markusN Aug 12 '12 at 20:05
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Thats it! The different pixel resolution was the reason for the stripes. This question can be marked as answered! – MAP Aug 13 '12 at 7:21
Please post the SAGA process as an answer. – maning Aug 19 '12 at 10:20

1 Answer

up vote 5 down vote accepted

Compare the resolution of the image and the DEM (open the image/DEM and look a the description under "cell size"). It should be the same, if not:

Align the resolution of the image and the DEM using (SAGA) "Grid" -> "Construction" -> "Resampling" Then choose the image or DEM you want to resample and set "user defined" at "Target Grid" and start. A new window opens. At "Cellsize" write the resolution you want (in my case it was the resolution of the Landsat image with 30m per pixel). enter image description here Now the image and the DEM should have the same resolution (cellsize) and you can now proceed with the topographic correction...

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