I would to extract linement from dem srtm and Landsat data, which is better? I I've done research using dem already shaded relief using LINE modeller in PCI geomatica software but the results have not been accurately , what is the best parameters for RADI, GTHR, LTHR, FTHR, ATHR, and DTHR ? is there any other methods beside using PCI Geomatica ?
you could try a Hough Transform if you have access to the matlab image processing toolbox
May be I'm too conservative, but I prefer visual analysis, especially if you are interested in linear features associated with active faulrs. Regarding what is better - Landsat or SRTM - both are informative in somehow different ways. Better to use both and compare.
indeed, Alexander Strom!
If referring on active faults you could do a lot to prove your visual impression. Just to name a few keywords:
SRTM: Slopes, Ruggedness, Sinuousity, Drainage...
Landsat: Soil moisture, vegetation, Lithology, ...
Geology: well... selfexplaining
Why do you want to extract linement ? For geological infrastructure mapping ?
In any case I do agree with Alexander semi analogic or semi visual analysis will be a good natural approach. Compute few layers from DEM such as flow accumulation, slope, etc....
Then play with the different layers and let your field experience talk. I should not say that but then you will find several automatic and systematic methodes to fit your expertise of the field
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