ESA - Eduspace EN - Global Change - Landslide detection in Langtang Himal

24-Apr-2025

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Landslide detection in Langtang Himal - Part 2

This exercise is divided into two parts and requires the use of LEOWorks.

At the centre of the images you should be able to identify a landslide. If you have difficulty finding it, look at the figure for identification help.

Landslide

1. Guess what area this landslide covers.

A landslide can usually be divided into 3 parts:

Landslide erosion: the place where land cover erodes.
Transportation: the area between the erosion and accumulation area.
Accumulation: at the end of the transportation zone, the landslide deposits its material.

Landslide zones

In the following part of the exercise you will measure these three parts of the landslide using the false colour infrared image.
Go to Image>Measure tool and a new window will open.
Click Units>Meters.
Carefully digitise, with the crosshair, the boundary of the landslide erosion zone. Click on your right mouse button once you are finished.

Measurement tool

Find out what is written in your measurement toolbox next to the field: Area!
It is the area of the landslide in square metres.
Do the same for the transportation zone, and measure the distance between the erosion and accumulation zone.
As a last step, measure the area of the accumulation zone.

1. Compare the measured area with your guesses.

2. Can you imagine an area of that size?

3. How many football fields would fit into an area of that size? The international standard for a football field is 68 x 105 m.

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Himalayas

Environmental problems in the Himalayas Urbanisation The Himalayan region Mountain ecosystems Nepal area Tibet area

Exercises

Himalaya - Worksheet Landscape units of Nepal Urbanisation – 40 years of urban development of Lhasa Urbanisation – Detection by means of delineation of the city perimeter Landslide detection in Langtang Himal

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