ESA - Eduspace EN - Global Change - Exercise 6: Multitemporal analysis

Coastal change

Danube Delta change detection Oil spills

Deforestation

Bardia National Park Congo River Basin Kameng-Sonitpur Elephant Reserve Kilimanjaro Rondonia Shillong and Guwahati

Ice

Antarctica 2003 Climate change and glaciers Glacier analysis using radar imagery Glacial retreat in the Alps Glacier Ice Flow Monitoring of glaciers in the Himalayas Remote sensing of ice and snow

Urbanisation

Cairo City of Kathmandu Córdoba Himalayas Kathmandu Valley Lagos

Vegetation

Annapurna Conservation Area Lost in the Andes Ngorongoro Conservation Area Niger Inland Delta Vegetation in South America


Multitemporal image

Exercise 6: Multitemporal analysis

In this exercise you will create a so-called multitemporal false colour composite. In order to do this we will use band 1 of the images from 1988 and 2010.

In New RGB View, select Red band for the 1988 image, and Green band and Blue band for the 2010 image.

In the resulting image you will see red where the glaciers retreated, and cyan (green-blue mixture) where the glacier advanced.

As discussed in Exercise 3, differences in shadows also show up in red.

Study and describe the changes shown in the multitemporal image.

1. How do these changes agree with your previous findings?

Measure some glacier length changes using the Measure Tool.

Compare the results you get to those you got from the animation, subtracted image and GIS.

2. Which of these methods (animation, subtracted image, GIS, multitemporal colour composite) do you consider the best for visualising glacier changes?

3. Which method do you think is best for measuring glacier change? Why?

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Climate change and glaciers

Introduction Background

Exercises

Worksheet introduction Exercise 1: Inspection of true colour RGB composites Exercise 2: Animation Exercise 3: Band Arithmetic Exercise 4: GIS Exercise 5: Measurement of area Conclusions

Eduspace - Software

LEOWorks 4 (MacOS)LEOWorks 4 (Linux)LEOWorks 4 (Windows)

Eduspace - Download

Andes_images.zip GoogleEarth file