Hi, i noticed on youtube that a lot of researchers change the unit of the degree slope map to radians on raster calculator while the original formula stays in degrees. because if we work by degrees, the result will be negative values, on the other hand in radians, there will be positive values.
Best regards
Dear Oussama Benselama dont follow youtube tutorials for blindly. please follow the latest open-source research article to resolve you issue.
Majority of youtubers are not familiar with technical aspects of GIS tools as they dont have background knowledge of it.
You must go through my article: " A Review of RUSLE Model".
Article A Review of RUSLE Model
I have used Slope map in Degree, for the assessment of soil loss.
Check the below link:
https://gis.stackexchange.com/questions/30240/how-to-calculate-ls-factor-of-watershed-for-rusle-calculation
Use formula of Wischmeier and Smith (1978) of LS factor calculation
Hi. Several equations for calculation LS or only S factor were derived. Slope in almost all these equations has to be in radians because there is goniometric function sinus. So the slope raster has to be multiplied by 0.01745 for conversion from degrees to radians. If you interested in you can fined more details in this paper: https://www.researchgate.net/publication/341523003_Possibilities_of_including_surface_runoff_barriers_in_the_slope-length_factor_calculation_in_the_GIS_environment_and_its_integration_in_the_user-friendly_LS-RUSLE_tool
Best Regards
Jiri
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