GIS Lesson 8 3: Raster Analysis (Terrain Analysis)

In this lesson we will analyze terrain data in terms of Slope, Hillshade, Aspect. We will reclassifiy data, deal with missing values and will get to learn the value tool plugin.

The written version can be found here:

[johnlepore]

Thank you! This gave a great overview of terrain analysis. So, would it be possible to use hillshade to identify fluvial terrains? Is there a way to obtain areas of 1 to 5% slope within a certain distance of a stream extraction (either raster or vector).

[LB-cpmm]

Thanks again for another great lecture. So after I have reclassified the aspect by direction (1-4) I then removed the maximum data values (55537) as identified through the information tool and the histogram. However, I found some white pixels in the image with a value of 55537. When I remove the 55537 as 'no data' on the image these pixels are adjusted but remain white with value that used to have a value of 55537 but are now identified as 'no data'. When I remove the underlying raster layers these same pixels are affected by the removal of the suitable terrain RAW data, the initial slope data, Hillshade and the SRTM data. It appears as though there are holes in the image. How would you explain these is it a bug? Sorry to be so long winded....!
NB. IT GETS FIXED IN THE