Unmanned Aerial Vehicle Technology for Quantitative Morphometry and Geomorphic Processes – Study Case in Rotational Landslide Deposited Areas
			
	
 
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				Department of Agrotechnology, Faculty of Agriculture, Stiper Agricultural University, Jl. Nangka II, Maguwoharjo, Special Region of Yogyakarta, 55283 Indonesia
				 
			 
										
				
				
		
		 
			
			
		
		
		
		
		
		
	
							
					    		
    			 
    			
    				    					Corresponding author
    					    				    				
    					Amir  Noviyanto   
    					Department of Agrotechnology, Faculty of Agriculture, Stiper Agricultural University, Jl. Nangka II, Maguwoharjo, Special Region of Yogyakarta, 55283 Indonesia
    				
 
    			
				 
    			 
    		 		
			
							 
		
	 
		
 
 
Ecol. Eng. Environ. Technol. 2024; 8:89-95
		
 
 
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ABSTRACT
The increasing use of drone technology to produce high-resolution digital imagery and elevation models has been associated with a growing interest in developing quantitative morphometric analysis (QMA). QMA analysis is an invaluable part of creating detailed topographic models in landslide scars that are still highly unstable and prone to erosion. This paper presents the results of a research that aims to create a topographic model in a landslide scarred area where the slope configuration is still varied. The study area is located in the landscape of the Cretaceous-Tertiary volcanic transition where many landslides have occurred. Three landslides were selected on the basis of different soil material characteristics that affect the topographic condition of the landslide scar. Aerial photography was recorded using a UAV with a flying height of 80 m, with an orthomosaic resolution of 1 cm. In detail, three morphometric variables (slope, plan curvature, topographic position index) were selected and calculated with the output evaluated based on visual-spatial interpretation. The results showed that morphometric variables performed well in modeling land surface topography. Steep slopes and surfaces with convex curvature are abundant at the ledges and landslide heads that allow water runoff to disperse as the initiation of gully erosion. The multidimensional gully erosion network is concentrated at relatively low elevations and surfaces with concave curvature. The undulating micro-relief of the land surface as a result of the process of material disposition builds up on each other to a gentle slope. Finally, the topographic model of the landslide surface can be used as a base material in making both physical and vegetative land conservation strategies.