Spatial mapping of water erosion with MCDA tool in ArcGIS

Using Analitical Hierarchy Process (AHP)

4.75 (2 reviews)
Udemy
platform
English
language
Science
category
instructor
27
students
5.5 hours
content
Feb 2022
last update
$34.99
regular price

What you will learn

Analytical Hierarchy Process

Land cover classification

Working with CRU precipitation NetCDF model

Euclidean distance

Soil texture

Curvature

Topographic wetness index (TWI)

Slope

Hydrologic analysis (flow accumulation and flow direction)

Model Builder

Mosaic raster

Description

This course is a handful, easy to learn, and apply guide for students, who want to apply GIS instrument and Analytical Hierarchy Process (AHP) to delineate areas that are highly or low susceptible to water erosion. The knowledge and skills represented throughout the course are easy to master and apply for any study area a student desires.

Water erosion is a very widespread phenomenon throughout the world and causes many negative consequences to the environment and human activity, including damage to agricultural productivity, reduction of soil fertility, and harming biodiversity. Besides the aforementioned, water erosion causes infrastructural damage, flood, and mass movement disturbances.

AHP is the most widely applied multi-criteria decision analysis tool and is used for multiple purposes during GIS analysis, including soil erosion modeling. AHP incorporates both psychological and mathematical methods to assign appropriate weights while making a different choice, whether it is choosing a university department, buying a car, or even searching for a partner. In this course, AHP will be used to assign weights for seven thematic layers that directly influence water erosion.

These layers include land use and land cover, precipitation, slope, curvature, topographic wetness index, soil texture, and stream proximity.

The course will teach to prepare all those thematic layers for any study area. By accomplishing this course a student will be able to create a map of water erosion susceptibility for any study area and understand clearly grasp the factors causing soil erosion. The results a student may use either for thesis dissertation or publication of an article, as well as conducting a research project.

The course includes both the theory and practice lectures, focusing mostly on the latter one (80%). This is a very useful course for both beginners and people with an intermediate knowledge of GIS and soil science.

Screenshots

Spatial mapping of water erosion with MCDA tool in ArcGIS - Screenshot_01Spatial mapping of water erosion with MCDA tool in ArcGIS - Screenshot_02Spatial mapping of water erosion with MCDA tool in ArcGIS - Screenshot_03Spatial mapping of water erosion with MCDA tool in ArcGIS - Screenshot_04

Content

Introduction

Introduction to the course

Basic theory on soil erosion

Soil erosion. Theory
Water erosion models. Theory

Multi-criteria decision analysis tool

MCDA. Theory

Analytical hierarchy process (AHP)

AHP. Theory
What is a pair-wised comparison in AHP
How to compute Eigen value and Eigen vector
How to create reciprocal matrix
Consistency index and Consistency ratio

Data for the project

Data for the project
Run the ArcMap project

LULC thematic layer

Land use and land cover classification. Theory
Download Landsat 8 images
Composite bands
LULC classification in ArcGIS
Post- classification correction

Slope thematic layer

Slope. Theory
Download ASTER image
Fill operation and Mosaic in Model Builder
Create Slope and reclassify
Steps to create Slope map

Curvature thematic layer

Curvature. Theory
Reproject DEM into UTM
Create the curvature map of the surface

Topographic wetness index thematic layer

TWI. Theory
Flow direction and flow accumulation
Slope in radians
Tan of slope
Flow accumulation rescaled
Create TWI layer

Stream proximity layer thematic layer

Stream proximity and stream erosion. Theory
Deriving streams from FD and FA using Stream order function
Create Euclidean distance for streams

Soil texture thematic layer

Soil structure. Theory
Download FAO global soil data
Add additional soil data from Excel file to the shapefile
Conversion into raster

Precipitation thematic layer

Precipitation. Theory
Download CRU precipitation data
Process NetCDF for study area
Kriging method to create final precipitation map

Water erosion mapping with AHP in ArcGIS

Making comparison matrix
Creating reciprocical matrix
Normalized Principal Eigen Vector
Principal Eigen Value (PEV)
Consistency index (CI) and Consistency ratio(CR)
Weighted overlay function
Calculate area of classes and percent of classes

Map presentation in ArcGIS

Final map presentation

Reviews

Shekhar
April 8, 2022
the author having rich in content and clear understanding of the subject and tools. awesome course to buy to enhance knowledge about soil-water mechanics.

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4523374
udemy ID
1/30/2022
course created date
2/24/2022
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