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
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4Did you used the same pixel resolution for both dem and landsat?– maningAug 12, 2012 at 14:51
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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?– MartinMapAug 12, 2012 at 15:35
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1You need to resample the DEM to the Landsat resolution (e.g. with the bilinear method if provided by SAGA).– markusNAug 12, 2012 at 20:05
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1Thats it! The different pixel resolution was the reason for the stripes. This question can be marked as answered!– MartinMapAug 13, 2012 at 7:21
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Please post the SAGA process as an answer.– maningAug 19, 2012 at 10:20
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1 Answer
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).
Now the image and the DEM should have the same resolution (cellsize) and you can now proceed with the topographic correction...
answered Aug 21, 2012 at 12:41
