Calculating Topographic Wetness Index in ArcGIS | 2023

Welcome to our comprehensive tutorial on calculating the Topographic Wetness Index (TWI) using ArcGIS! 🌊 In this video, we'll walk you through the step-by-step process of deriving TWI, a crucial parameter in hydrology and environmental studies. Whether you're a GIS professional, a student, or someone interested in understanding the science behind terrain wetness, this tutorial has got you covered. ---------------------------------------------------------------- Don't forget to like, share, and subscribe for more GIS tutorials and geospatial insights! If you have any questions or suggestions for future videos, please leave them in the comments section below. Happy mapping! 🗺️📚 ---------------------------------------------------------------- 💰🤝🏻Join Membership to get access to perks & Support us🤝🏻💰 ✔️    / @terraspatial   ---------------------------------------------------------------- 🌐 Stay connected: 📌 Subscribe to our Channel: https://www.youtube.com/@TerraSpatial... 📌 Facebook: facebook.com/terraspatial 📌 Geosuite blog: geosuite.blogspot.com ---------------------------------------------------------------- What is Topographic Wetness Index (TWI)? Topographic Wetness Index (TWI) quantifies terrain driven variation in soil moisture. ---------------------------------------------------------------- The Topographic Wetness Index (TWI) was developed by Beven and Kirkby (1979) within the runoff model TOPMOD. It is defined as ln(a/tanβ) where a is the local upslope area draining through a certain point per unit contour length and tanβ is the local slope. ----------------------------------------------------------------  SRTM 1 Arc-Second Global – 30m (Used for this Study), USGS Website https://earthexplorer.usgs.gov/ ---------------------------------------------------------------- Link for Downloading Word Document on TWI: https://drive.google.com/file/d/1Tvdd... How to Download SRTM DEM - Video Guide:    • Downloading 30m SRTM DEM data from USGS Ea...   ---------------------------------------------------------------- Steps in Calculating Topographic Wetness Index: 00:00 Introduction 00:30 Adding DEM Data 00:46 Project Raster GCS to PCS 02:11 Fill DEM 03:13 Flow Direction 04:03 Flow Accumulation 04:47 Slope in Degree 05:37 Radians of Slope 07:30 Tan Slope 09:14 Flow Accumulation Scaled 10:43 Topographic Wetness Index (TWI) 11:38 Changing Color / Symbology 12:58 Clipping Raster ---------------------------------------------------------------- Other Important Links: To know more about Degrees to Radians Conversion visit: https://www.wikihow.com/Convert-Degre... Topographic Wetness Index: https://www.sciencedirect.com/science... ---------------------------------------------------------------- #topographicwetnessindex #TWI #arcgis #hydrology #geospatial #DEM