Topographic Roughness Index | Topographic Ruggedness Index | Arc GIS 

im also instructor but you are the best one! I learned many things from you :) Thanks.

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How to calculate TPI

Sir, please tell me Roughness Index and Ruggedness Index are the same? I send a link below, please explain the matter. How to calculate the - Terrain Ruggedness Index (TRI) and Vector Ruggedness Measurement (VRM)? please help me.