Calculating Topographic Wetness Index in ArcGIS | SRTM DEM | 2023

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Hello Dear Viewers, Easily Learn how to calculate Topographic Wetness Index (TWI) in ArcGIS. For Calculating TWI DEM or DTM data is required. Topographic Wetness Index is also referred as Compound Topographic Index (CTI). Data Used in the Tutorial: Processed using SRTM data, SRTM is available from EarthExplorer, USGS Website. USGS EROS Archive - Digital Elevation - Shuttle Radar Topography Mission (SRTM) 1 Arc-Second Global.
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Steps Coved in the Video:
00:00 Introduction
01:05 Step 1: Add DEM to ArcGIS
01:15 Step 2: Project Raster
04:08 Step 3: Fill DEM
06:04 Step 4: Flow Direction
06:57 Step 5: Flow Accumulation
08:45 Step 6: Slope in Degree
09:35 Step 7: Radians of Slope
12:22 Step 8: Tan Slope
15:40 Step 9: Flow Accumulation Scaled
17:09 Step 10: TWI
18:10 Result
18:17 Symbology - Class
19:50 Clip Raster - Study Area
21:24 Finally TWI for Study Area - Done
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More Information about Topographic Wetness Index:
What is Topographic Wetness Index?
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.
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Important Links:
1. To know more about Degrees to Radians Conversion visit:
2. Earth Explorer for Data Access:
SRTM 1 Arc-Second Global – 30m (Used for this Study),
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